Effects of Cu addition on the corrosion behavior of NiCoCrMo alloys in neutral chloride solution

Abstract

The influence of Cu addition (0-4 mass%) on the corrosion behavior of Ni-30Co-16Cr-15Mo alloy in neutral chloride solution is investigated by electrochemical measurements. The results indicate that alloy with 0.5 mass% Cu shows inferior corrosion resistance compared to Cu-free alloy under open-circuit potential, which is possibly ascribed to the galvanic corrosion from the insufficient coverage of Cu on the passive film; a higher fraction of Cu results in a significant improvement on corrosion resistance, and Cu is believed capable of strengthening the passivation and postponing the oxidization of dominant Cr(iii) in the passive film into more soluble Cr(vi).