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← ScienceWhich mechanism causes localized corrosion to accelerate greatly near grain boundaries in a stainless steel lattice?
A)Crevice oxidation reduces diffusion efficiency
B)Galvanic coupling increases chromium depletion✓
C)Passive layer growth concentrates stress
D)Vacancy diffusion causes dislocation pinning
💡 Explanation
Galvanic coupling accelerates corrosion because the grain boundaries provide paths for faster chromium diffusion at the Cr-depleted zones that are produced from precipitation; therefore, a higher corrosion rate occurs, creating pits, rather than uniform thinning due to a homogenous passive layer.
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