Metallurgical Engineering > GATE 2024 > Corrosion
The microstructures of a quenched steel tempered at three temperatures T1 < T2 < T3 for a fixed time are schematically illustrated. The solid circles represent cementite particles in ferrite matrix; r̅1, r̅2 and r̅3 are average radii of cementite particles, and V1, V2 and V3 are volume fractions of cementite at temperatures T1, T2 and T3 respectively.
If the cementite in steel is more noble than ferrite, then which one of the three microstructures will have the highest corrosion rate when exposed to an aqueous solution of 3.5 wt.% NaCl?
Correct : a
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