Question

corrosion that occurs when two dissimilar metals are placed in contact with each other is called:
a. filiform corrosion.
b. rust.
c. crevice corrosion.
d. galvanic corrosion.

Explanation:

• Filiform corrosion is a type of corrosion that occurs under coatings and appears as thin, thread - like filaments.
• Rust is the common name for iron oxide, which is a product of the corrosion of iron.
• Crevice corrosion occurs in narrow spaces (crevices) where there is a stagnant solution.
• Galvanic corrosion is the electrochemical corrosion that occurs when two dissimilar metals are in contact in the presence of an electrolyte.

Answer:

D. Galvanic corrosion.