Materials & corrosion


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Materials & corrosion

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Materials & corrosion

  1. 1. Materials/ Corrosion• Metallic materials and welding• Corrosion and cathodic protection• Surface treatment and polymers• Flame plasma surface treatment• Inspection technology
  2. 2. Metallic Materials Metallic Materials – Materials that are like metal; having the properties of metal; containing or consisting of metal
  3. 3. Welding Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces.
  4. 4. Corrosion Corrosion is the gradual destruction of material, usually metal, by chemical reaction with its environment. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen. Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion. This type of damage typically produces oxide(s) or salt(s) of the original metal. Corrosion can also occur in materials other than metals, such as ceramics or polymers, although in this context, the term degradation is more common.
  5. 5. Cathodic protection (CP) Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell.[1] The simplest method to apply CP is by connecting the metal to be protected with another more easily corroded "sacrificial metal" to act as the anode of the electrochemical cell. Another method of protection impresses a small direct current on a structure. Cathodic protection systems are used to protect a wide range of metallic structures in various environments. Common applications are; steel water or fuel pipelines and storage tanks; steel pier piles; ships and boats; offshore oil platforms and onshore oil well casings and metal reinforcement bars in concrete buildings and structures. Cathodic protection can, in some cases, prevent stress corrosion cracking.
  6. 6. Surface finishing Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property.[1] Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction.[1][2] In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item. Surface finishing processes can be categorized by how they affect the workpiece: ◦ Removing or reshaping finishing ◦ Adding or altering finishing ◦ Mechanical processes may also be categorized together because of similarities the final surface finish
  7. 7. Polymer A polymer is a large molecule (macromolecule) composed of repeating structural units. These sub-units are typically connected by covalent chemical bonds. Although the term polymer is sometimes taken to refer to plastics, it actually encompasses a large class of compounds comprising both natural and synthetic materials with a wide variety of properties. IOR: Emulsified polymer (DPR) stimulation at Gullfaks
  8. 8. Inspection technology Non destructive testing solutions: ◦ Radiography ◦ Computed tomography ◦ Remote visual inspection ◦ Ultrasound ◦ Eddy current ◦ Hardness testing ◦ Metrology
  9. 9. Demand
  10. 10. Material engineer
  11. 11. Welding engineer