Which corrosion damage involves the surface being covered with rust and pitting. Rust patches do not appear to be caked.

• A. Developed Rust
• B. Minor Corrosion
• C. Caked Rust
• D. Major Corrosion

Answer: (A)

Developed rust describes surface rust that has formed with some pits, but without a thick, cake-like crust. The scenario states the surface is covered with rust and has pitting, yet the rust patches aren’t caked into a hard layer. That combination fits developed rust best: the corrosion is evident and pitted but hasn’t progressed to a thick, crusty buildup. Minor corrosion would have little or no pitting, major corrosion would show extensive, deeper damage, and caked rust would present a hard, adherent crust rather than just patches of rust with pits.