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The effect of Cu addition on the corrosion behavior of 3Cr steel in 3.5 wt.% NaCl solution was investigated by immersion tests and electrochemical measurements. Cu was selected to partially replace Cr in Cu-modified 3Cr steel. Cu addition can improve corrosion resistance of 3Cr steel at the initial stage, and then the phenomenon gradually weakens with increasing immersion time. The reduced corrosion resistance of 3Cr steel caused by Cr decrease suitably offset by the presence of Cu, resulting a reduced-cost Cu-modified 3Cr steel without sacrificing ether its mechanical properties or corrosion resistance.

Corrosion Resistance of Cu-modified 3Cr Low-alloy Steel in 3.5%NaCl Solution