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Corrosion Failures
Corrosion is chemically induced damage to a material that results in
deterioration of the material and its properties. This may result in
failure of the component. Several factors should
be considered during a failure analysis to determine the affect corrosion played in a failure.
Examples are listed below:
- Type
of corrosion
- Corrosion rate
- The extent of the corrosion
- Interaction between corrosion and other failure mechanisms
Corrosion is is a normal,
natural process. Corrosion can seldom be totally prevented, but it can be
minimized or controlled by proper choice of material, design, coatings, and
occasionally by changing the environment. Various types of metallic and
nonmetallic coatings are regularly used to protect metal parts from corrosion. |
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Stress
corrosion cracking necessitates a tensile stress, which may be caused by
residual stresses, and a specific environment to cause progressive fracture of a
metal. Aluminum and stainless steel are well known for stress corrosion
cracking problems. However, all metals are susceptible to stress corrosion
cracking in the right environment.
Laboratory
corrosion testing is frequently used in analysis but is difficult to correlate
with actual service conditions. Variations in service conditions are
sometimes difficult to duplicate in laboratory testing
Corrosion Failures Analysis
Identification of the metal or metals, environment the metal was subjected
to, foreign matter and/or surface layer of the metal is beneficial in failure
determination. Examples of some common types of corrosion are listed
below:
Not all corrosion failures need a comprehensive
failure analysis. At times a preliminary examination will provide enough
information to show a simple analysis is adequate.
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