________ is attack that proceeds more or less uniformly over the exposed surface with appreciable localization of attack

• A. Localized corrosion
• B. Environmental cracking
• C. General corrosion
• D. Fretting corrosion

Answer: (C)

The main idea here is uniform, or general, corrosion. This type of attack happens across the entire exposed surface at roughly the same rate, causing the metal to thin evenly rather than deteriorate in specific spots. It occurs when the environment is relatively uniform and there aren’t strong local anodic sites, crevices, or mechanical wear concentrating the attack. That’s why it’s described as proceeding more or less uniformly over the surface. In contrast, localized corrosion forms—like pits, crevice, or intergranular corrosion—show concentrated damage at particular spots, and fretting or environmental cracking involve wear or stress-assisted crack growth rather than even surface thinning.