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← ScienceWhich mechanism accelerates corrosion when stainless steel's chromium concentration falls below a threshold?
A)Loss of passivity passivation layer✓
B)Increased galvanic electrochemical potential
C)Elevated grain boundary sensitization
D)Intensified pitting chloride attack
💡 Explanation
Loss of passivity occurs because reduced Cr hinders formation of the chromium oxide passivation layer as per equilibrium. Therefore, corrosion accelerates, rather than reduced galvanic potential because the layer no longer protects against oxidation in oxidizing environments.
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