Which of the following is NOT typically a sign of general attack corrosion?

• A. Roughening of the surface.
• B. Localized pitting.
• C. Presence of corrosion products.
• D. Weight loss.

Answer: (B)

General attack corrosion shows uniform metal loss across the surface due to electrochemical dissolution. You’d typically see a surface that becomes rougher but changes evenly over the area, along with visible corrosion products and a measurable weight loss after exposure. Localized pitting, however, indicates corrosion occurring in small, concentrated spots, creating pits rather than a uniform attack. That localized behavior is not characteristic of general attack, so it stands out as not being a typical sign. The presence of corrosion products and weight loss fit general attack, as does broad surface roughening, whereas pits point to a different, localized form of corrosion.