The document summarizes research on the effect of cooling rate on microstructure and corrosion properties of an Mg ZEK100 alloy. Wedge casting was used to produce variations in cooling rate, resulting in differences in grain size and secondary phase particle size/distribution. Faster cooling led to smaller microstructural features. Corrosion testing found damage occurred next to intermetallic particles at grain boundaries. While corrosion rate was unaffected by cooling rate, the presence of epoxy caused deeper, tracking corrosion likely due to crevice formation.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
Nanocoating GDZ is compared with Conventional YSZ coating for Hot Corrosion Resistance in presence of V2O5 and Na2SO4 salt which are formed at high temp in gas turbines.
Inventors and entrepreneurs have vocations fueled by passion. Many would have done it for free or as a hobby if it hadn’t become a profession. Mark Rosenzweig is a natural creator, driven by his passion. This fuel has led Mark to develop his ideas into viable products and innovations that he has been patenting since 2003. From an innovative filter sensor and indicator for vacuum cleaners to a basket for deep fryer and methods of cooking food products to a compact cyclonic bagless vacuum cleaner. Sometimes independently and often as part of creative teams, Mark has patented just under one hundred innovative inventions between 2003 and 2017.
ASME section 2C Specifications for Welding Rods, Electrodes, and Filler Metals
ð
19
Þ
LIST OF SECTIONS
SECTIONS
I Rules for Construction of Power BoilersII Materials
•
Part A
—
Ferrous Material Specifications
•
Part B
—
Nonferrous Material Specifications
•
Part C
—
Specifications for Welding Rods, Electrodes, and Filler Metals
•
Part D
—
Properties (Customary)
•
Part D
—
Properties (Metric)III Rules for Construction of Nuclear Facility Components
•
Subsection NCA
—
General Requirements for Division 1 and Division 2
•
Appendices
•
Division 1
–
Subsection NB
—
Class 1 Components
–
Subsection NC
—
Class 2 Components
–
Subsection ND
—
Class 3 Components
–
Subsection NE
—
Class MC Components
–
Subsection NF
—
Supports
–
Subsection NG
—
Core Support Structures
•
Division 2
—
Code for Concrete Containments
•
Division 3
—
Containment Systems for Transportation and Storage of Spent Nuclear Fuel and High-LevelRadioactive Material
•
Division 5
—
High Temperature Reactors IV Rules for Construction of Heating BoilersV Nondestructive ExaminationVI Recommended Rules for the Care and Operation of Heating BoilersVII Recommended Guidelines for the Care of Power BoilersVIII Rules for Construction of Pressure Vessels
•
Division 1
•
Division 2
—
Alternative Rules
•
Division 3
—
Alternative Rules for Construction of High Pressure VesselsIX Welding, Brazing, and Fusing QualificationsX Fiber-Reinforced Plastic Pressure Vessels XI Rules for Inservice Inspection of Nuclear Power Plant Components
•
Division 1
—
Rules for Inspection and Testing of Components of Light-Water-Cooled Plants
•
Division 2
—
Requirements for Reliability and Integrity Management (RIM) Programs for Nuclear Power Plants XII Rules for Construction and Continued Service of Transport Tanks
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
Nanocoating GDZ is compared with Conventional YSZ coating for Hot Corrosion Resistance in presence of V2O5 and Na2SO4 salt which are formed at high temp in gas turbines.
Inventors and entrepreneurs have vocations fueled by passion. Many would have done it for free or as a hobby if it hadn’t become a profession. Mark Rosenzweig is a natural creator, driven by his passion. This fuel has led Mark to develop his ideas into viable products and innovations that he has been patenting since 2003. From an innovative filter sensor and indicator for vacuum cleaners to a basket for deep fryer and methods of cooking food products to a compact cyclonic bagless vacuum cleaner. Sometimes independently and often as part of creative teams, Mark has patented just under one hundred innovative inventions between 2003 and 2017.
ASME section 2C Specifications for Welding Rods, Electrodes, and Filler Metals
ð
19
Þ
LIST OF SECTIONS
SECTIONS
I Rules for Construction of Power BoilersII Materials
•
Part A
—
Ferrous Material Specifications
•
Part B
—
Nonferrous Material Specifications
•
Part C
—
Specifications for Welding Rods, Electrodes, and Filler Metals
•
Part D
—
Properties (Customary)
•
Part D
—
Properties (Metric)III Rules for Construction of Nuclear Facility Components
•
Subsection NCA
—
General Requirements for Division 1 and Division 2
•
Appendices
•
Division 1
–
Subsection NB
—
Class 1 Components
–
Subsection NC
—
Class 2 Components
–
Subsection ND
—
Class 3 Components
–
Subsection NE
—
Class MC Components
–
Subsection NF
—
Supports
–
Subsection NG
—
Core Support Structures
•
Division 2
—
Code for Concrete Containments
•
Division 3
—
Containment Systems for Transportation and Storage of Spent Nuclear Fuel and High-LevelRadioactive Material
•
Division 5
—
High Temperature Reactors IV Rules for Construction of Heating BoilersV Nondestructive ExaminationVI Recommended Rules for the Care and Operation of Heating BoilersVII Recommended Guidelines for the Care of Power BoilersVIII Rules for Construction of Pressure Vessels
•
Division 1
•
Division 2
—
Alternative Rules
•
Division 3
—
Alternative Rules for Construction of High Pressure VesselsIX Welding, Brazing, and Fusing QualificationsX Fiber-Reinforced Plastic Pressure Vessels XI Rules for Inservice Inspection of Nuclear Power Plant Components
•
Division 1
—
Rules for Inspection and Testing of Components of Light-Water-Cooled Plants
•
Division 2
—
Requirements for Reliability and Integrity Management (RIM) Programs for Nuclear Power Plants XII Rules for Construction and Continued Service of Transport Tanks
EFFECT OF SCANDIUM ON THE SOFTENING BEHAVIOUR OF DIFFERENT DEGREE OF COLD ROL...msejjournal
The softening behavior of different cold rolled Al-6Mg alloys containing scandium 0.2 wt% and 0.6 wt% have been investigated by means of microscopy, hardness and electrical conductivity measurements. It is found that the scandium added alloys attend the higher hardness at every state of cold rolling at higher
annealed temperature due to the precipitation of scandium aluminides. Electrical resistivity of the scandium added alloys show higher than base alloy due to grain refining. It is seen from the microstructure that scandium refine the grain structure and inhibit recrystallization.
What is CAF?
A growth consisting of a conductive copper-containing salt. It is created electrochemically and grows from the anode toward the cathode subsurface along the epoxy/glass interface.
Conductive Anodic Filament (CAF) formation does happen
o When it happens, it can cause a lot of pain
CAF behavior is relatively stable
o Limited change in key PCB technology (pitch, materials,
assembly)
CAF mitigation is well known (execute it!)
o Evaluate your designs
o Qualify your suppliers
This paper presents a study that investigates the corrosion behavior of annealed 2205 duplex stainless steel in sulphuric acid environment. Duplex 2205 stainless steel black bar in ASTM A276 was obtained and annealed in solite furnace for 45 minutes. A control sample which was not heat treated was also prepared. The annealed and the control samples which were metallographically prepared were then analyzed for corrosion behavior in sulphuric acid using potentiodynamic test/analysis. The potentiodynamic polarization plot generated showed that the annealed samples exhibit less corrosion resistance than the untreated samples, indicating that annealing heat treatment reduces the corrosion resistance of 2205 duplex stainless steel in sulphuric acid.
A review on advanced ceramic processing techniquesAlokjyoti Dash
This Presentation enlists and describes most ceramic process and most parameters which affect these ceramic processing. A reader shall understand the basic of these presented process to fabricate unique ceramic materials
Done by Electron Group, Ahmed bin Hanbal Independent Secondary school for boys
Concrete : building material made by mixing cement with sand , gravel , water - of material things existing in material form that can be touched, felt or definite.
The presence of salt in soil or groundwater inside the concrete structure is a source of corrosion and cracks, as some salts attack the concrete and begin to fragment it such as sulfates
Dispersion Hardening:
Hard particles:
Mixed with matrix powder
Consolidated
Processed by powder metallurgy techniques
Second phase – Very little solubility (Even at elevated temp.)
No coherency
So thermally Stable at very high temp.
Resists :
Grain growth
Over aging
Recrystallization
Mobility of dislocation
Different from particle Metallic Composites (Volume Fraction is 3 to 4% max.) (Does not affect stiffness)
Examples : Al2O3 in Al or Cu, ThO2 in Ni
Fundamentals, synthesis and applications of Al2O3-ZrO2 compositesTANDRA MOHANTA
When the word “Ceramic” comes to our mind, we usually associate them with plates, saucers, cups and mugs. But, the word “Ceramic” encompasses more than just the word “plates” or “saucers”. Indeed, ceramic materials are hard and inherently brittle, but this is just the tip of the iceberg. They have multifarious properties and have acquired a status of high technical importance in the field of scientific research. Ceramics are the soul of the modern day’s structural applications owing to their high mechanical and thermal stability under different challenging conditions. They exhibit remarkable properties such as high hardness, high wear resistance, high corrosion resistance, high elastic modulus, high melting point and the ability to retain high strength at elevated temperatures. Alumina (Al2O3) is one such remarkable ceramic material known for its unique optical, mechanical and electrical properties. But the brittle nature of Al2O3 limits its use in certain engineering applications. Therefore, the strength of Al2O3 and Al2O3- based ceramics can be enhanced by tailoring the microstructural design through the application of strategic techniques that may involve secondary phase particle inclusion (such as Zirconia, ZrO2)
One can get full description of metallic glasses which contains history, preparation methods, effects on metallic glasses, properties and application part is also there with diagrams, tables and graphs
EFFECT OF SCANDIUM ON THE SOFTENING BEHAVIOUR OF DIFFERENT DEGREE OF COLD ROL...msejjournal
The softening behavior of different cold rolled Al-6Mg alloys containing scandium 0.2 wt% and 0.6 wt% have been investigated by means of microscopy, hardness and electrical conductivity measurements. It is found that the scandium added alloys attend the higher hardness at every state of cold rolling at higher
annealed temperature due to the precipitation of scandium aluminides. Electrical resistivity of the scandium added alloys show higher than base alloy due to grain refining. It is seen from the microstructure that scandium refine the grain structure and inhibit recrystallization.
What is CAF?
A growth consisting of a conductive copper-containing salt. It is created electrochemically and grows from the anode toward the cathode subsurface along the epoxy/glass interface.
Conductive Anodic Filament (CAF) formation does happen
o When it happens, it can cause a lot of pain
CAF behavior is relatively stable
o Limited change in key PCB technology (pitch, materials,
assembly)
CAF mitigation is well known (execute it!)
o Evaluate your designs
o Qualify your suppliers
This paper presents a study that investigates the corrosion behavior of annealed 2205 duplex stainless steel in sulphuric acid environment. Duplex 2205 stainless steel black bar in ASTM A276 was obtained and annealed in solite furnace for 45 minutes. A control sample which was not heat treated was also prepared. The annealed and the control samples which were metallographically prepared were then analyzed for corrosion behavior in sulphuric acid using potentiodynamic test/analysis. The potentiodynamic polarization plot generated showed that the annealed samples exhibit less corrosion resistance than the untreated samples, indicating that annealing heat treatment reduces the corrosion resistance of 2205 duplex stainless steel in sulphuric acid.
A review on advanced ceramic processing techniquesAlokjyoti Dash
This Presentation enlists and describes most ceramic process and most parameters which affect these ceramic processing. A reader shall understand the basic of these presented process to fabricate unique ceramic materials
Done by Electron Group, Ahmed bin Hanbal Independent Secondary school for boys
Concrete : building material made by mixing cement with sand , gravel , water - of material things existing in material form that can be touched, felt or definite.
The presence of salt in soil or groundwater inside the concrete structure is a source of corrosion and cracks, as some salts attack the concrete and begin to fragment it such as sulfates
Dispersion Hardening:
Hard particles:
Mixed with matrix powder
Consolidated
Processed by powder metallurgy techniques
Second phase – Very little solubility (Even at elevated temp.)
No coherency
So thermally Stable at very high temp.
Resists :
Grain growth
Over aging
Recrystallization
Mobility of dislocation
Different from particle Metallic Composites (Volume Fraction is 3 to 4% max.) (Does not affect stiffness)
Examples : Al2O3 in Al or Cu, ThO2 in Ni
Fundamentals, synthesis and applications of Al2O3-ZrO2 compositesTANDRA MOHANTA
When the word “Ceramic” comes to our mind, we usually associate them with plates, saucers, cups and mugs. But, the word “Ceramic” encompasses more than just the word “plates” or “saucers”. Indeed, ceramic materials are hard and inherently brittle, but this is just the tip of the iceberg. They have multifarious properties and have acquired a status of high technical importance in the field of scientific research. Ceramics are the soul of the modern day’s structural applications owing to their high mechanical and thermal stability under different challenging conditions. They exhibit remarkable properties such as high hardness, high wear resistance, high corrosion resistance, high elastic modulus, high melting point and the ability to retain high strength at elevated temperatures. Alumina (Al2O3) is one such remarkable ceramic material known for its unique optical, mechanical and electrical properties. But the brittle nature of Al2O3 limits its use in certain engineering applications. Therefore, the strength of Al2O3 and Al2O3- based ceramics can be enhanced by tailoring the microstructural design through the application of strategic techniques that may involve secondary phase particle inclusion (such as Zirconia, ZrO2)
One can get full description of metallic glasses which contains history, preparation methods, effects on metallic glasses, properties and application part is also there with diagrams, tables and graphs
On the anodic reaction of the co2 corrosion process, Iron carbonate nucleatio...Omar Yepez, PhD
The anodic reaction of the carbonic acid corrosion process controls the outcome of the degradation of the material. This is because it might produce an FeCO3 scale. In turn, the quality of this crystal will influence the corrosion rate. At the interphase, a colloid of iron carbonate forms. This is fed by Fe+2 coming from the metal dissolution and reacting with the HCO3- coming from the solution. In the colloid, different aggregates of iron carbonate molecules occur. This is until a critical nucleus of the siderite phase occurs, thus forming a siderite crystal. All parameters that normally affect corrosion rate, will affect directly the nucleation, growth and quality of this crystal. Particularly, the metal surface texture and pH of the solution. The nucleation of siderite was studied with anodic chronoamperometry at different surface textures and pH values. It was found that the surface texture is determinant on the law governing siderite nucleation and therefore its scale. FeCO3 formation is required but not sufficient to produce a protective siderite scale. Even after producing such scale, it needs to grow to a certain thickness to offer any protection. Higher pH and rougher surfaces help to achieve good protection. Weight loss corrosion rates measured in autoclave experiments, is controlled by the siderite nucleation phenomena occurring at the interphase.
Study on hardening mechanisms in aluminium alloysIJERA Editor
The Al-Zn-Mg alloys are most commonly used age-hardenable aluminium alloys. The hardening mechanism is
further enhanced in addition of Sc. Sc additions to aluminium alloys are more promising. Due to the
heterogeneous distribution of nano-sized Al3Sc precipitates hardening effect can be accelerated. Mainly,
highlight on hardening mechanism in Al-Zn-Mg alloys with Sc effect is to study. In addition, several
characterisations have been done to age-hardening measurements at elevated temperatures from 120oC to 180
oC. The ageing kinetics has also been calculated from Arrhenius equation. Furthermore, friction stir processing
(FSP) can be introduced to surface modification process and hardened the cast aluminium alloys. In this study,
hardening mechanism can be evaluated by Vicker’s hardness measurement and mechanical testing is present
task.
Study on hardening mechanisms in aluminium alloysIJERA Editor
The Al-Zn-Mg alloys are most commonly used age-hardenable aluminium alloys. The hardening mechanism is
further enhanced in addition of Sc. Sc additions to aluminium alloys are more promising. Due to the
heterogeneous distribution of nano-sized Al3Sc precipitates hardening effect can be accelerated. Mainly,
highlight on hardening mechanism in Al-Zn-Mg alloys with Sc effect is to study. In addition, several
characterisations have been done to age-hardening measurements at elevated temperatures from 120oC to 180
oC. The ageing kinetics has also been calculated from Arrhenius equation. Furthermore, friction stir processing
(FSP) can be introduced to surface modification process and hardened the cast aluminium alloys. In this study,
hardening mechanism can be evaluated by Vicker’s hardness measurement and mechanical testing is present
task.
Microstructure and Hardness observation of HEAT AFFECTED ZONE of low carbon s...Mukesh Karnik
TO study HEAT AFFECTED ZONE of low carbon steel(Mild steel),
Micro-structure observation of heat affected zone of mild steel,
Hardness test done of mild steel at their different zones.
at the result we find out that the HAZ zone grain was more coarser than base metal and HAZ zone.
due to sudden cooling at fusion zone micro structure columnar form which increase the hardness at that zone much more.
Introduction to casting, Major classifications of casting, Casting terminology, Characteristics of molding sand, Constituents of foundry sand, Patterns and their types, Cores and types of cores, Gating system, Types of gates, Solidification, Riser system, Types of riser, Types of allowances, Directional Solidification, Defects in casting, Riser design(Chvorinov's rules), Advanced casting techniques:Shell molding, Permanent mould casting, Vacuum die casting, Low pressure die casting, Continuous casting, Squeeze casting, Slush casting, Vacuum casting, Die Casting, Centrifugal casting, Investment casting
1. The Influence of Cooling Rate on
the Corrosion Properties of Mg
ZEK100 Alloy via Wedge Casting
W. Jeffrey Binns, Aaron Kirkey, D.W. Shoesmith
NACE Student Symposium
July 6 2015
2. 2
ZEK100 Mg Alloys Have Useful Properties
Pros:
Cons:
• Excellent strength-to-weight ratio
• Good low temperature castability
due to rare earth additions
• Alloying elements create multiple
phases
• Mg alloys experience galvanic
coupling which accelerates
corrosion
3. 3
Effect of Casting Procedure on Corrosion
• Al distribution was most uniform in the
order: die cast > graphite cast > sand cast
• Al network collects corrosion product while
Mg matrix experiences dissolution
• Average corrosion penetration depth
increases in the order: die cast < graphite
cast < sand cast.
20 µm
50 µm
Sand Cast
Graphite Cast
Die Cast Al
50 µm50 µm
50 µm 50 µm 50 µm
20 µm 20 µm
SEM - Polished Al Elemental Map Depth Profile
RM Asmussen; WJ Binns; P Jakupi; D Shoesmith, JES, (2014) 161 (10), C501-C508.
Slow Cooling Rate
Fast Cooling Rate
4. 4
Corrosion Depends on Microstructure Distribution
• Volume fraction of α-Mg and β-Mg17Al12 is the same
independent of casting method
• Corrosion processes are controlled by more than just elemental
composition
• Size, shape and distribution of secondary phases is also
important
Volume Fraction of AM50 Phases
3_AM50_SandCast_full2hrs.raw_1
2Th Degrees
585654525048464442403836343230
Counts
4,600
4,400
4,200
4,000
3,800
3,600
3,400
3,200
3,000
2,800
2,600
2,400
2,200
2,000
1,800
1,600
1,400
1,200
1,000
800
600
400
200
0
Mg 91.67 %
Mg17Al12 8.33 %
2_AM50_GraphiteCast_full2hrs.raw_1
2Th Degrees
585654525048464442403836343230
Counts
4,000
3,900
3,800
3,700
3,600
3,500
3,400
3,300
3,200
3,100
3,000
2,900
2,800
2,700
2,600
2,500
2,400
2,300
2,200
2,100
2,000
1,900
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
Mg 91.39 %
Mg17Al12 8.61 %
1_AM50_DieCast_full2hrs.raw
2Th Degrees
585654525048464442403836343230
Counts
4,400
4,200
4,000
3,800
3,600
3,400
3,200
3,000
2,800
2,600
2,400
2,200
2,000
1,800
1,600
1,400
1,200
1,000
800
600
400
200
0
Mg 91.15 %
Mg17Al12 8.85 %
Sand cast
Graphite cast
Die cast
Danaie, Mohsen; The Cathodic Behaviour of AlMn Intermetallic Particles in Mg AM50 Alloy, Montreal, QC, (2013).
5. 5
Wedge Casting to Tailor Microstructure Size & Shape
Experimental
• 60 kg bricks were melted in a resistance furnace using a mild steel crucible under the protection of CO2 + 0.5% SF6 gas mixture.
• Time-temperature cycle was the same for all melts.
• After removal of any oxide films the castings were poured at 730 °C in a water-cooled copper mold. To generate microstructures
under different solidification rates (with varying section thickness).
• The cooling rate during solidification was measured using five or six thermocouples, positioned along the centerline of the wedge
casts
3.5”
7.0”
¼”
½”
1”
2”
Thin - 1
2
3
4
5
Thick - 6
Thermocouple Placements
6. 6
Materials Preparation
• test our findings i.e., microstructure distribution effect, on an individual wedge cast
• determine which processing (i.e., cooling, crystallization) rate parameters optimize corrosion resistance
0.5 cm
1.0 cm
Section - A
Section - M
Wedge
Section
%Al %Zn %Mn %Fe %Nd %Zr
A 0.02 1.31 0.02 < 0.01 0.17 0.40
D 0.02 1.38 0.02 < 0.01 0.19 0.37
F 0.01 1.32 0.02 < 0.01 0.15 0.36
L 0.02 1.20 0.02 < 0.01 0.15 0.40
7. 7
Computer Modelling Confirms Gradient in Cooling Rate
t = 2.5 s t = 5.0 s t = 7.5 s
t = 10.0 s t = 20.0 st = 15.0 s
• Modelling constructed using data from 6
thermocouples placed along the center line
• Columnar dendritic crystallization
properties are influenced by cooling rate
M. Farrokhnejad Numerical Modeling of Solidification Process and Prediction of Mechanical Properties in Magnesium Alloys. PhD. Thesis, University of Western Ontarion, London, ON, 2013
8. 8
Cooling Rate Effects Microstructure Size and Distribution
A D F M
Zn Zn Zn Zn
Zr Zr Zr Zr
• Distinct segregation in alloying elements for different solidification rates; i.e., Zr vs. Nd
• Larger secondary phases produced at slower solidification rates
Mg7Zn3RE
T-phase
Zr IMP
α-Mg
100 µm 100 µm 100 µm 100 µm
9. 9
ECORR is Similar for Different Cooling Rates
0 2 4 6 8 10 12 14 16 18 20 22 24
-1.95
-1.90
-1.85
-1.80
-1.75
-1.70
-1.65
-1.60
-1.55
-1.50
E(VvsSCE)
Time (h)
ZEK100 WC A
ZEK100 WC D
ZEK100 WC G
ZEK100 WC M
• 1.6 wt% NaCl solution
• Length of time required to reach a steady state ECORR
differs depending on cooling rate
• Steady state ECORR is consistent independent of cooling
rate
10. 10
Corrosion Morphology is Similar for Different Cooling Rates
100 µm
1000 µm
A D G M
A D G M
1000 µm1000 µm1000 µm
100 µm100 µm100 µm
• Corroded in 1.6 wt% NaCl solution for 24 h
11. 11
SEM Indicates Galvanic Attack
A D
G M
Corrosion Product Domes
Zr-rich Intermetallic Particles
Ruptured Corrosion Product Domes
• Corroded in 1.6 wt% NaCl solution
for 24 h
12. 12
Multiple Damage Morphologies Exist
With Corrosion Product Without Corrosion Product
• Corrosion product removed with 0.2 M chromic acid solution
• Damage appears in pit-like formations within grain body
14. 14
Damage Occurs Adjacent to T-phase
• FIB cut on section A following immersion for 24 h in 1.6 wt% NaCl solution
• Damage occurs next to T-phase particles which segregate in grain boundaries
15. 15
Possible Mechanism of Corrosion
W.C. Neil; M. Forsyth; P.C. Howlett; C.R. Hutchinson; B.R.W. Hinton, Corros. Sci., (2009) 51, 387-394.
16. 16
What About the Tracking Corrosion?
0 4 8 12 16 20 24
-2.0
-1.9
-1.8
-1.7
-1.6
-1.5
-1.4
E(VvsSCE)
Time (h)
MgZEK100 WC A epoxy
MgZEK100 WC D epoxy
MgZEK100 WC F epoxy
MgZEK100 WC B no epoxy
MgZEK100 WC M no epoxy
• Corroded in 0.16 wt% NaCl
ECORR of Wedge Cast MgZEK100 Alloy No Epoxy Epoxy
B
FM
D
17. 17
Summary and Conclusions
• Wedge casting produced an Mg ZEK100 alloy with large differences in grain
size as well as the size and distribution of secondary T-phase particles
• Size and distribution of Zr-rich intermetallic particles was unaffected by the
gradient in the cooling rate of the wedge
• Corrosion damage occurred next to T-phase particles which segregate into
grain boundaries as well as in pit-like features within the grain body.
• Deep, tracking corrosion was only observed in samples cast in epoxy and
may be the result of crevice formation between the alloy and the epoxy