Definition
Corrosion is the chemical or electrochemical degradation of a material (most commonly a metal reacting with moisture, oxygen, or other environmental agents) that progressively reduces wall thickness, structural strength, or surface integrity. It is a specific damage mechanism, distinguishable from mechanical wear by its chemical rather than frictional origin.
Key facts
- A chemical or electrochemical process, distinct from mechanical wear, which results from friction or contact rather than a chemical reaction.
- Common forms include uniform surface corrosion, localized pitting, and galvanic corrosion between dissimilar metals in contact.
- Rate depends heavily on environment (humidity, chemical exposure, temperature) which is why the same material corrodes at very different rates in different locations.
- Detected through visual inspection, thickness measurement (ultrasonic testing), and, for coatings, adhesion and integrity checks.
What does Corrosion reveal about failures?
Corrosion is the progressive chemical or electrochemical breakdown of a material's surface or structure, most often a metal oxidizing or reacting with moisture and environmental agents, gradually reducing wall thickness or structural strength until it compromises function or safety.
How do teams use Corrosion in failure analysis?
Corrosion is recognized through visual signs (rust, pitting, discoloration, coating breakdown) and confirmed through thickness or material-loss measurement where structural integrity is a concern, distinguishing it from mechanical wear (caused by friction or contact) and from contamination (a foreign substance present rather than material degradation).
FAQ
Frequently asked questions
Which damage process is referred to as corrosion?
Corrosion refers to the chemical or electrochemical degradation of a material, most commonly a metal reacting with moisture or environmental agents, progressively reducing its structural integrity, distinct from mechanical wear caused by friction.
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