Which category includes Galvanic Corrosion, Pitting Corrosion, Exfoliation Corrosion, and Intergranular Corrosion?

Which category includes Galvanic Corrosion, Pitting Corrosion, Exfoliation Corrosion, and Intergranular Corrosion?

• A. Pitting Corrosion
• B. Corrosion Types
• C. Exfoliation Corrosion
• D. Intergranular Corrosion

Answer: (B)

All of these are different mechanisms of metal deterioration, which fall under the broad category of corrosion types. Galvanic corrosion occurs when two dissimilar metals are in electrical contact in an electrolyte, causing the more anodic metal to corrode faster. Pitting corrosion is a localized attack that forms small pits, often driven by chloride ions breaking down protective oxide films. Exfoliation corrosion happens in certain aluminum alloys when corrosion products push layers apart, causing the material to flake. Intergranular corrosion attacks along grain boundaries, typically after processes that sensitized the metal, leading to weakened structural integrity along those boundaries. Because they are distinct ways corrosion can occur, they’re all examples of corrosion types—the umbrella category that includes these forms.

All of these are different mechanisms of metal deterioration, which fall under the broad category of corrosion types. Galvanic corrosion occurs when two dissimilar metals are in electrical contact in an electrolyte, causing the more anodic metal to corrode faster. Pitting corrosion is a localized attack that forms small pits, often driven by chloride ions breaking down protective oxide films. Exfoliation corrosion happens in certain aluminum alloys when corrosion products push layers apart, causing the material to flake. Intergranular corrosion attacks along grain boundaries, typically after processes that sensitized the metal, leading to weakened structural integrity along those boundaries. Because they are distinct ways corrosion can occur, they’re all examples of corrosion types—the umbrella category that includes these forms.