Which of the following is not a type of corrosion?

The term "destructive corrosion" is not recognized as a specific type of corrosion within the field of materials science or engineering. Corrosion generally refers to various processes that degrade materials, particularly metals, often due to reactions with their environment.

Pitting corrosion, galvanic corrosion, and stray current corrosion are well-defined types.

Pitting corrosion refers to the formation of small pits or holes in a material, often due to localized electrochemical reactions, and is particularly problematic in stainless steels and other metals.

Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte, leading to one metal corroding faster than expected.

Stray current corrosion is induced by unwanted stray currents from external sources, which can accelerate the corrosion process by altering the electrochemical environment.

These terms reflect specific mechanisms and conditions that lead to material degradation, which is why "destructive corrosion" does not fit into the established classifications of corrosion types.