corrosion presentation
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Virtually all engineering materials will corrode or decay over time when exposed to their environment. The rate of decay depends on the material and conditions. Like the human body, materials require protection from extreme temperatures, pressures, and harmful gases through coatings, inhibitors, alloys, maintenance and inspection. Corrosion causes the disintegration of materials into constituent atoms via chemical reactions with the surroundings like oxygen, and reduces material strength, lifetime and properties. Data on corrosion rates helps determine if a material is suitable for an application, with over 50 mils per year generally unsuitable. Common types of corrosion include uniform, galvanic, pitting, stress, erosion and microbial. Protections methods aim to control reactions or provide permanent barriers
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Corrosion inhibitors.ppt
Corrosion inhibitors are substances that, when added in small amounts to an aqueous corrosive environment, decrease the corrosion of a metal. There are two types of inhibitors: anodic inhibitors form protective films on metal surfaces to reduce corrosion at anodes, while cathodic inhibitors either slow the diffusion of hydrogen ions or increase the overvoltage of hydrogen evolution to reduce corrosion at cathodes. Common examples of both types of inhibitors are listed.
Pitting Corrosion_Rahul
Pitting corrosion is a localized form of corrosion that leads to the formation of small cavities or holes in the material. It occurs when small areas become active (anodic) while the surrounding areas remain passive (cathodic). This creates galvanic cells that drive the corrosion process. Pitting corrosion initiates at defects on the material surface and then propagates in an autocatalytic manner. It is most common in alloys protected by a passive film when exposed to environments containing chlorides, oxygen, and stagnant conditions. Proper material selection, surface finishing, controlling environmental factors like pH and chloride levels, and using protective coatings or cathodic protection can help prevent pitting corrosion.
Corrosive Damage In Metals & Its Prevention
Corrosion is the degradation of materials due to reaction with the environment. It affects metals, non-metals, and living tissues, causing damage like material loss and increased costs. Proper material selection, design modifications, environmental control, and protective coatings or cathodic protection can prevent a majority of corrosion damage and reduce annual economic losses estimated to be 3-5% of global GDP.
Corrosion presentation
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and stopping corrosion.
Forms of corrosion
A presentation giving the classification of corrosion and various forms of corrosion. Basic features of these various forms re given.
(Pitting corrosion and crevice corrosion)
This document discusses pitting corrosion and crevice corrosion in metals. It defines these types of localized corrosion and explains their mechanisms. Pitting corrosion occurs in localized holes in metals and is difficult to detect. Crevice corrosion occurs in cracks and crevices where conditions differ from the bulk solution, leading to acidification and accelerated corrosion. Both types of corrosion are influenced by parameters like chloride concentration, temperature, material properties, and coatings. The document provides diagrams illustrating the corrosion mechanisms and test methods for evaluating resistance to pitting and crevice corrosion.
Types of corrosions
14 Types of Corrosion explained in an awesome manner
Update 26 June 2019: I have enabled the Download option and now everyone can download the "Types of corrosions" PPT and reuse the slides :) I wish I have done this earlier.
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Corrosion inhibitors.ppt
Corrosion inhibitors are substances that, when added in small amounts to an aqueous corrosive environment, decrease the corrosion of a metal. There are two types of inhibitors: anodic inhibitors form protective films on metal surfaces to reduce corrosion at anodes, while cathodic inhibitors either slow the diffusion of hydrogen ions or increase the overvoltage of hydrogen evolution to reduce corrosion at cathodes. Common examples of both types of inhibitors are listed.
Pitting Corrosion_Rahul
Pitting corrosion is a localized form of corrosion that leads to the formation of small cavities or holes in the material. It occurs when small areas become active (anodic) while the surrounding areas remain passive (cathodic). This creates galvanic cells that drive the corrosion process. Pitting corrosion initiates at defects on the material surface and then propagates in an autocatalytic manner. It is most common in alloys protected by a passive film when exposed to environments containing chlorides, oxygen, and stagnant conditions. Proper material selection, surface finishing, controlling environmental factors like pH and chloride levels, and using protective coatings or cathodic protection can help prevent pitting corrosion.
Corrosive Damage In Metals & Its Prevention
Corrosion is the degradation of materials due to reaction with the environment. It affects metals, non-metals, and living tissues, causing damage like material loss and increased costs. Proper material selection, design modifications, environmental control, and protective coatings or cathodic protection can prevent a majority of corrosion damage and reduce annual economic losses estimated to be 3-5% of global GDP.
Corrosion presentation
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and stopping corrosion.
Forms of corrosion
A presentation giving the classification of corrosion and various forms of corrosion. Basic features of these various forms re given.
(Pitting corrosion and crevice corrosion)
This document discusses pitting corrosion and crevice corrosion in metals. It defines these types of localized corrosion and explains their mechanisms. Pitting corrosion occurs in localized holes in metals and is difficult to detect. Crevice corrosion occurs in cracks and crevices where conditions differ from the bulk solution, leading to acidification and accelerated corrosion. Both types of corrosion are influenced by parameters like chloride concentration, temperature, material properties, and coatings. The document provides diagrams illustrating the corrosion mechanisms and test methods for evaluating resistance to pitting and crevice corrosion.
Types of corrosions
14 Types of Corrosion explained in an awesome manner
Update 26 June 2019: I have enabled the Download option and now everyone can download the "Types of corrosions" PPT and reuse the slides :) I wish I have done this earlier.
Follow my blogs at https://www.geekdashboard.com/
Corrosion
This document discusses various forms of corrosion that can occur in metals. It begins by defining corrosion and explaining the factors that influence it. It then describes several specific types of corrosion: general/uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, dealloying, erosion corrosion, stress corrosion, hydrogen damage including hydrogen blistering and hydrogen embrittlement. For each type of corrosion, the document discusses the mechanism and provides methods for prevention.
Types of corrosion
Corrosion is the deterioration of metals due to chemical reactions with the surrounding environment. There are two main types: dry corrosion which occurs without moisture and involves direct chemical attack, and wet corrosion which is electrochemical and occurs in the presence of an electrolyte. Wet corrosion involves the formation of anodic and cathodic areas on a metal surface where oxidation occurs at the anode and corrosion products form elsewhere. Common forms of wet corrosion include galvanic corrosion between dissimilar metals and concentration cell corrosion between areas of different aeration.
CORROSIVE DAMAGE IN METALS AND ITS PREVENTION
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selective leaching type corrosion
Selective leaching, also called de-alloying or de-metalification, refers to the selective removal of one element from an alloy by corrosion processes. A common example is the dezincification of brass, where zinc is selectively removed leaving a porous copper structure. There are three steps in the mechanism of dezincification: (1) dissolution of the entire alloy, (2) replating of the more noble metal (copper), and (3) leaching away of the active metal (zinc). Dezincification can occur uniformly or in localized plugs and is caused by water containing sulfur, carbon dioxide, and oxygen. Prevention methods include using less susceptible alloys, adding inhibitors like tin
Chapter5 corrosion
The document discusses corrosion, which is defined as the degradation of a metal through a chemical reaction on its surface caused by its surrounding chemicals. It then discusses the chemical theory of corrosion, noting that oxygen and other gases can cause corrosion by directly reacting with metals. There are two main types of corrosion - dry corrosion, which occurs without moisture, and wet/electrochemical corrosion, which occurs when a metal is in contact with a conducting liquid. The document goes on to describe examples of different corrosion processes and methods used to protect metals from corrosion, including cathodic protection and coatings like paint.
Intergranular Corrosion
Intergranular Corrosion
Causes and Mechanism Intergranular Corrosion Types Of Intergranular Corrosion
Corrosion
Corrosion is the deterioration of materials through chemical reactions with the environment. It refers mainly to metals but can also affect other materials like plastics and concrete. Corrosion can have serious economic and safety consequences by reducing strength, causing equipment downtime, and loss of surface properties. It can lead to failures and expensive replacements even when only a small amount of metal is destroyed. Underground pipes and electronic components are especially vulnerable. The effects of corrosion are influenced by factors like water flow, exposure to sea water, contact between dissimilar metals, and lack of protective coatings.
Corrosion control by inhibitor
Corrosion inhibitors are chemical substances that minimize or prevent corrosion when added in small concentrations to an environment. They work by forming protective films on metal surfaces or reacting with corrosive components. Inhibitors can be inorganic, like chromates and nitrites, or organic compounds. They are applied through continuous injection, batch treatment, or squeeze treatment. The efficiency of an inhibitor depends on its concentration and ability to form protective barrier films on metals. Scavengers like hydrazine and sodium sulfite are also used to remove oxygen which promotes corrosion. Inhibitors find applications in various industries like petroleum, packaging, sour gas, and cooling systems.
Corrosion control
The document discusses various methods of corrosion control including material selection, alteration of environment, proper design, cathodic protection, anodic protection, and coatings & wrapping. It provides details on each method. For material selection, it discusses selecting the proper material based on the corrosive environment and lists examples of appropriate materials for common environments. It also discusses the various types of stainless steel and their alloying elements and properties.
Loss of corrosion and prevention of corrosion
we know a lot about loss of due to corrosion and prevention of corrosion. a lot of information you can know in this slide
Corrosion ppt part 1
The document discusses corrosion of metals and its various types. It defines corrosion as the deterioration of metal due to chemical reactions with the environment. Corrosion occurs via oxidation and causes metal loss. The main factors influencing corrosion are the metal composition, environmental chemicals, temperature, and design. Corrosion can be uniform, galvanic, pitting, intergranular or stress-related. Electrochemical corrosion involves the formation of anodes and cathodes on a metal surface.
Corrosion of Metals and Prevention of Corrosion
about corrosion of metals like copper , iron , silver with diagrams and also methods to prevent corrosion like alloying , chrome plating , galvanization etc.
Different types of corrosion
1. Electrochemical corrosion occurs via oxidation and reduction reactions when a metal is in contact with an electrolyte like an acid or salt solution. Electrons generated through oxidation must be consumed in reduction reactions.
2. There are several types of electrochemical corrosion including galvanic, pitting, differential aeration, water line, crevice, stress, and intragranular corrosion.
3. Galvanic corrosion occurs when two dissimilar metals are in electrical contact in a corrosive environment, leading to accelerated corrosion of the metal with the lower reduction potential. Common examples include zinc anodes on copper or steel structures.
Corrosin Basic
The document discusses corrosion from multiple perspectives. It defines corrosion as the deterioration of metals through chemical or electrochemical reactions with the environment. It notes that understanding chemistry, electrochemistry, and metallurgy is important for understanding corrosion. Corrosion can damage infrastructure and equipment by reducing strength, changing dimensions, and contaminating products. The costs of corrosion are high, with estimates of billions of dollars spent annually to address corrosion in areas like pipelines, structures, and water systems. Proper application of corrosion prevention and control techniques can help reduce these costs.
Corrosion
This document discusses various types of corrosion including uniform corrosion, galvanic corrosion, concentration cell corrosion, pitting corrosion, crevice corrosion, filiform corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, fretting corrosion, erosion corrosion, dealloying, hydrogen embrittlement, corrosion in concrete, and microbial corrosion. It also discusses common corrosion prevention and protection methods like using proper materials for certain environments, protective coatings, cathodic protection, corrosion allowance in engineering design, and the low corrosion of ceramics. The annual cost of corrosion worldwide is over 3% of GDP.
Corrosion Process and Control
1. Corrosion is the degradation of materials like steel through chemical or electrochemical reaction with surrounding media like water and oxygen, forming rust (iron hydroxide).
2. Several types of corrosion are described, including uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, erosion corrosion, stress corrosion cracking, fatigue corrosion, and microbiologically influenced corrosion.
3. Methods to mitigate corrosion include protective coatings like paint and cathodic protection systems that use sacrificial anodes or impressed current to redirect corrosion to the anode from the protected structure. Surface preparation, coating selection, application, and achieving the proper dry film thickness are important.
Hydrogen Embrittlement : Causes, Effects, Prevention.
This document discusses hydrogen embrittlement, which is the loss of ductility in a material caused by hydrogen absorption. It can occur in body-centered cubic and hexagonal close-packed metals when as little as 0.0001% hydrogen is absorbed. Hydrogen is introduced through processes like corrosion and welding. It causes increased strain rate sensitivity and susceptibility to delayed fracture. Several mechanisms are proposed to explain how hydrogen causes embrittlement, including hydride formation and reducing decohesion strength. Prevention techniques include reducing corrosion, using cleaner steels, baking to remove hydrogen, proper welding practices, and alloying to reduce hydrogen diffusion.
Corrosion and its Control
This ppt explains basics of corrosion, its significance, Mechanism of electrochemical and chemical corrosion, Cathodic protection, Anodic protection, Sacrificial protection, Galvanization, Concentration Corrosion, Pitting Corrosion and also describe about the prevention and control of corrosion with respect to protective coatings and modification in design.
corrosion nivi
Corrosion is the deterioration of materials due to chemical reactions with the environment. The key factors that influence the rate of corrosion are: the type of metal, its position in the galvanic series, impurities, the nature of the surface film, corrosion products, temperature, humidity, presence of corrosive gases, pH, and applied potential and pH as shown in Pourbaix diagrams. Understanding these factors is important for preventing corrosion through methods like coatings, cathodic protection, and using corrosion-resistant alloys.
Corrosion & Mechanism of Dry corrosion
1. Dry or chemical corrosion occurs via direct chemical reaction between a metal surface and gases in the atmosphere like oxygen, carbon dioxide, hydrogen sulfide, and sulfur dioxide. It involves adsorption of gas molecules on the metal surface.
2. The mechanism of dry corrosion involves oxidation of the metal surface and reduction of gas molecules, forming a metal oxide layer. The nature and properties of this oxide layer determines whether it is protective or porous.
3. According to the Pilling-Bedworth rule, a protective oxide layer has a volume equal to or greater than the original metal, while a porous layer has a smaller volume, allowing further corrosion. Metals like chromium and aluminum form protective passive layers contributing to corrosion resistance.
Corrosion.ppt
This document discusses different theories and types of corrosion. It begins by introducing corrosion as the formation of compounds on a metal's surface through chemical reaction with its environment. It then summarizes three main theories of corrosion: (1) the acid theory involving reaction with carbon dioxide, moisture and oxygen; (2) the chemical theory involving direct reaction with gases like oxygen; and (3) the electrochemical theory involving the formation of anodes and cathodes when a metal is in contact with a conducting liquid. The document goes on to describe eight common types of corrosion in more detail.
Design corrosion
As an old adage says, corrosion prevention must start at the blackboard, at the design stage. A good design at the blackboard is no more costly than a bad design, a bad design is always more expensive than a good design in reality. Technical design inclu- des the aspects of design that directly bear on the proper technical functioning of the product attributes that describe how it works and how it is made. Design configuration has a critical role to play in the service life of components
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Corrosion
This document discusses various forms of corrosion that can occur in metals. It begins by defining corrosion and explaining the factors that influence it. It then describes several specific types of corrosion: general/uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, dealloying, erosion corrosion, stress corrosion, hydrogen damage including hydrogen blistering and hydrogen embrittlement. For each type of corrosion, the document discusses the mechanism and provides methods for prevention.
Types of corrosion
Corrosion is the deterioration of metals due to chemical reactions with the surrounding environment. There are two main types: dry corrosion which occurs without moisture and involves direct chemical attack, and wet corrosion which is electrochemical and occurs in the presence of an electrolyte. Wet corrosion involves the formation of anodic and cathodic areas on a metal surface where oxidation occurs at the anode and corrosion products form elsewhere. Common forms of wet corrosion include galvanic corrosion between dissimilar metals and concentration cell corrosion between areas of different aeration.
CORROSIVE DAMAGE IN METALS AND ITS PREVENTION
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selective leaching type corrosion
Selective leaching, also called de-alloying or de-metalification, refers to the selective removal of one element from an alloy by corrosion processes. A common example is the dezincification of brass, where zinc is selectively removed leaving a porous copper structure. There are three steps in the mechanism of dezincification: (1) dissolution of the entire alloy, (2) replating of the more noble metal (copper), and (3) leaching away of the active metal (zinc). Dezincification can occur uniformly or in localized plugs and is caused by water containing sulfur, carbon dioxide, and oxygen. Prevention methods include using less susceptible alloys, adding inhibitors like tin
Chapter5 corrosion
The document discusses corrosion, which is defined as the degradation of a metal through a chemical reaction on its surface caused by its surrounding chemicals. It then discusses the chemical theory of corrosion, noting that oxygen and other gases can cause corrosion by directly reacting with metals. There are two main types of corrosion - dry corrosion, which occurs without moisture, and wet/electrochemical corrosion, which occurs when a metal is in contact with a conducting liquid. The document goes on to describe examples of different corrosion processes and methods used to protect metals from corrosion, including cathodic protection and coatings like paint.
Intergranular Corrosion
Intergranular Corrosion
Causes and Mechanism Intergranular Corrosion Types Of Intergranular Corrosion
Corrosion
Corrosion is the deterioration of materials through chemical reactions with the environment. It refers mainly to metals but can also affect other materials like plastics and concrete. Corrosion can have serious economic and safety consequences by reducing strength, causing equipment downtime, and loss of surface properties. It can lead to failures and expensive replacements even when only a small amount of metal is destroyed. Underground pipes and electronic components are especially vulnerable. The effects of corrosion are influenced by factors like water flow, exposure to sea water, contact between dissimilar metals, and lack of protective coatings.
Corrosion control by inhibitor
Corrosion inhibitors are chemical substances that minimize or prevent corrosion when added in small concentrations to an environment. They work by forming protective films on metal surfaces or reacting with corrosive components. Inhibitors can be inorganic, like chromates and nitrites, or organic compounds. They are applied through continuous injection, batch treatment, or squeeze treatment. The efficiency of an inhibitor depends on its concentration and ability to form protective barrier films on metals. Scavengers like hydrazine and sodium sulfite are also used to remove oxygen which promotes corrosion. Inhibitors find applications in various industries like petroleum, packaging, sour gas, and cooling systems.
Corrosion control
The document discusses various methods of corrosion control including material selection, alteration of environment, proper design, cathodic protection, anodic protection, and coatings & wrapping. It provides details on each method. For material selection, it discusses selecting the proper material based on the corrosive environment and lists examples of appropriate materials for common environments. It also discusses the various types of stainless steel and their alloying elements and properties.
Loss of corrosion and prevention of corrosion
we know a lot about loss of due to corrosion and prevention of corrosion. a lot of information you can know in this slide
Corrosion ppt part 1
The document discusses corrosion of metals and its various types. It defines corrosion as the deterioration of metal due to chemical reactions with the environment. Corrosion occurs via oxidation and causes metal loss. The main factors influencing corrosion are the metal composition, environmental chemicals, temperature, and design. Corrosion can be uniform, galvanic, pitting, intergranular or stress-related. Electrochemical corrosion involves the formation of anodes and cathodes on a metal surface.
Corrosion of Metals and Prevention of Corrosion
about corrosion of metals like copper , iron , silver with diagrams and also methods to prevent corrosion like alloying , chrome plating , galvanization etc.
Different types of corrosion
1. Electrochemical corrosion occurs via oxidation and reduction reactions when a metal is in contact with an electrolyte like an acid or salt solution. Electrons generated through oxidation must be consumed in reduction reactions.
2. There are several types of electrochemical corrosion including galvanic, pitting, differential aeration, water line, crevice, stress, and intragranular corrosion.
3. Galvanic corrosion occurs when two dissimilar metals are in electrical contact in a corrosive environment, leading to accelerated corrosion of the metal with the lower reduction potential. Common examples include zinc anodes on copper or steel structures.
Corrosin Basic
The document discusses corrosion from multiple perspectives. It defines corrosion as the deterioration of metals through chemical or electrochemical reactions with the environment. It notes that understanding chemistry, electrochemistry, and metallurgy is important for understanding corrosion. Corrosion can damage infrastructure and equipment by reducing strength, changing dimensions, and contaminating products. The costs of corrosion are high, with estimates of billions of dollars spent annually to address corrosion in areas like pipelines, structures, and water systems. Proper application of corrosion prevention and control techniques can help reduce these costs.
Corrosion
This document discusses various types of corrosion including uniform corrosion, galvanic corrosion, concentration cell corrosion, pitting corrosion, crevice corrosion, filiform corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, fretting corrosion, erosion corrosion, dealloying, hydrogen embrittlement, corrosion in concrete, and microbial corrosion. It also discusses common corrosion prevention and protection methods like using proper materials for certain environments, protective coatings, cathodic protection, corrosion allowance in engineering design, and the low corrosion of ceramics. The annual cost of corrosion worldwide is over 3% of GDP.
Corrosion Process and Control
1. Corrosion is the degradation of materials like steel through chemical or electrochemical reaction with surrounding media like water and oxygen, forming rust (iron hydroxide).
2. Several types of corrosion are described, including uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, erosion corrosion, stress corrosion cracking, fatigue corrosion, and microbiologically influenced corrosion.
3. Methods to mitigate corrosion include protective coatings like paint and cathodic protection systems that use sacrificial anodes or impressed current to redirect corrosion to the anode from the protected structure. Surface preparation, coating selection, application, and achieving the proper dry film thickness are important.
Hydrogen Embrittlement : Causes, Effects, Prevention.
This document discusses hydrogen embrittlement, which is the loss of ductility in a material caused by hydrogen absorption. It can occur in body-centered cubic and hexagonal close-packed metals when as little as 0.0001% hydrogen is absorbed. Hydrogen is introduced through processes like corrosion and welding. It causes increased strain rate sensitivity and susceptibility to delayed fracture. Several mechanisms are proposed to explain how hydrogen causes embrittlement, including hydride formation and reducing decohesion strength. Prevention techniques include reducing corrosion, using cleaner steels, baking to remove hydrogen, proper welding practices, and alloying to reduce hydrogen diffusion.
Corrosion and its Control
This ppt explains basics of corrosion, its significance, Mechanism of electrochemical and chemical corrosion, Cathodic protection, Anodic protection, Sacrificial protection, Galvanization, Concentration Corrosion, Pitting Corrosion and also describe about the prevention and control of corrosion with respect to protective coatings and modification in design.
corrosion nivi
Corrosion is the deterioration of materials due to chemical reactions with the environment. The key factors that influence the rate of corrosion are: the type of metal, its position in the galvanic series, impurities, the nature of the surface film, corrosion products, temperature, humidity, presence of corrosive gases, pH, and applied potential and pH as shown in Pourbaix diagrams. Understanding these factors is important for preventing corrosion through methods like coatings, cathodic protection, and using corrosion-resistant alloys.
Corrosion & Mechanism of Dry corrosion
1. Dry or chemical corrosion occurs via direct chemical reaction between a metal surface and gases in the atmosphere like oxygen, carbon dioxide, hydrogen sulfide, and sulfur dioxide. It involves adsorption of gas molecules on the metal surface.
2. The mechanism of dry corrosion involves oxidation of the metal surface and reduction of gas molecules, forming a metal oxide layer. The nature and properties of this oxide layer determines whether it is protective or porous.
3. According to the Pilling-Bedworth rule, a protective oxide layer has a volume equal to or greater than the original metal, while a porous layer has a smaller volume, allowing further corrosion. Metals like chromium and aluminum form protective passive layers contributing to corrosion resistance.
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Hydrogen Embrittlement : Causes, Effects, Prevention.
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This document discusses different theories and types of corrosion. It begins by introducing corrosion as the formation of compounds on a metal's surface through chemical reaction with its environment. It then summarizes three main theories of corrosion: (1) the acid theory involving reaction with carbon dioxide, moisture and oxygen; (2) the chemical theory involving direct reaction with gases like oxygen; and (3) the electrochemical theory involving the formation of anodes and cathodes when a metal is in contact with a conducting liquid. The document goes on to describe eight common types of corrosion in more detail.
Design corrosion
As an old adage says, corrosion prevention must start at the blackboard, at the design stage. A good design at the blackboard is no more costly than a bad design, a bad design is always more expensive than a good design in reality. Technical design inclu- des the aspects of design that directly bear on the proper technical functioning of the product attributes that describe how it works and how it is made. Design configuration has a critical role to play in the service life of components
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This document discusses different forms of corrosion. It classifies corrosion as wet/aqueous corrosion, which occurs in the presence of water, or dry/gaseous corrosion, which occurs at high temperatures. Wet corrosion is further broken down into uniform corrosion, galvanic corrosion, crevice corrosion, pitting, dealloying, intergranular corrosion, and others. Examples are provided for each type. The document also discusses high temperature corrosion processes like oxidation and corrosion in sulfur environments.
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Introduction to Earth
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Structure of the earth
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Inside the Earth ppt
The Earth is divided into three main layers - the crust, mantle, and core - based on their composition.
The crust is the outermost layer and exists as either oceanic or continental crust. Below the crust lies the mantle, which is thick and composed of heavier minerals. The core is at the center and consists of a solid inner core surrounded by a liquid outer core.
Composition Of Air
Nitrogen makes up 78% of air and is not used by most living things except some bacteria and plant roots. Oxygen makes up 21% of air and is essential for respiration in plants and animals. Carbon dioxide is used by plants in photosynthesis and is essential for making food and sugars while oxygen is produced.
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This document discusses different types of corrosion, including uniform corrosion, galvanic corrosion, crevice corrosion, and pitting corrosion. Uniform corrosion affects the entire exposed metal surface at a generally predictable and low rate. Galvanic corrosion occurs when two dissimilar metals are electrically coupled in an electrolyte. Crevice corrosion happens in cracks or gaps where oxygen is depleted. Pitting corrosion produces small, deep pits and is very destructive despite only causing small weight loss. The document explains the mechanisms and factors that influence each corrosion type and provides strategies for prevention.
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corrosion presentation
- 1. “ A Simple view on a complex matter”
- 2. • Virtually no practical and engineering material is stable. The rate of decay varies depending upon the material and its environment. • The human system cannot endure – Temp above 50 C or below 20 C – Pressures above or below our atmospheres – Presence of harmful gases such as CO, H2S, and H2. • Thus, analogous to human system, engineering materials also require protection like – coatings, inhibitors, alloy addition, design procedures, maintenance, inspection and re- furnishing.
- 3. Corrosion is the disintegration of an engineered material into its constituent atom due to chemical reactions with its surroundings. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as O2.
- 4. EFFECTS OF CORROSION • Reduces Strength • Life time is reduced • Metallic properties are lost • Wastage of metal
- 5. IMPORTANCE OF CORROSION DATA 5 mpy Good corrosion resistant material 5 to 50 mpy Low corrosion resistant material 50 mpy Unsuitable as constructional material
- 7. CHEMICAL EQUATION OF CORROSION
- 9. UNIFORM CORROSION CAN BE A GOOD OR A BAD THING. CORROSION OCCURS EVENLY OVER THE SURFACE. OXIDE LAYER CAN BE VERY TOUGH – MAGNETITE. FE3O4
- 10. GALVANIC CORROSION o CHEMICAL REACTIONS. o ELECTRONS REMOVED FROM ONE REACTANT TRAVEL THROUGH AN EXTERNAL CIRCUIT. oMETERIAL TENDS TO DISAPPEAR.
- 12. STRESS CORROSION BRITTLE CRACKS FORM AT THE SITES OF STRESS. FAILURE CAN BE FAST. FAILURE CAN OCCUR AT STRESS LOADS FAR BELOW YIELD STRENGTH. THREE CONDITIONS REQUIRED FOR MOST COMMON KIND ARE ----- METAL UNDER DISSOLVED CHLORIDE TENSILE OXYGEN ION STRESS
- 13. ERROSION CORROSION • FLOW REMOVES PROTECTIVE LAYER. • NEW POTECTIVE LAYER FORMS USING UP METAL.
- 14. MICROBIAL CORROSION SIMILAR TO PITTING CORROSION. BACTERIA IN WATER.
- 15. PREVENTIONS OF CORROSION
- 16. ACIVE CORROSION PROTECTION • The aim of active corrosion protection is to influence the reactions which proceed during corrosion, it being possible to control not only the package contents and the corrosive agent but also the reaction itself in such a manner that corrosion is avoided. .• Examples of such an approach are the development of corrosion-resistant alloys.
- 17. PERMANENT CORROSION PROTECTION • The purpose of permanent corrosion protection methods is mainly to provide protection at the place of use. The stresses presented by climatic, biotic & chemical factors are relatively slight in this situation. • For example, in factories shed are protected from extreme variations in temperature, which is frequently the cause of condensation.
- 18. Created & Edited by – Abhi Gambhir (10 th A)