General attack corrosion can be recognized by which statement?

• A. General attack corrosion can be recognized by uniform material loss across the surface with surface roughening and sometimes corrosion products.
• B. It is characterized exclusively by deep local pits.
• C. It forms a protective layer that prevents further corrosion.
• D. It occurs only in high-temperature environments.

Answer: (A)

General attack corrosion, also called uniform corrosion, occurs as a consistent thinning of the metal over the entire exposed surface. The statement that best describes this is: you see uniform material loss across the surface with surface roughening and sometimes corrosion products. This reflects how electrochemical reactions can proceed at similar rates across a broad area, leading to overall thinning and a more uneven, rough surface as rust or oxide forms.

The other descriptions point to different phenomena. Deep pits indicate localized corrosion (pitting) rather than uniform attack. A protective, adherent layer that prevents further corrosion describes passivation or corrosion-inhibiting behavior, not the widespread thinning typical of general attack. Finally, general attack is not limited to high-temperature conditions; it can occur at normal temperatures whenever the environment is corrosive enough.