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Effect of Cu on the corrosion resistance and electrochemical response of a Ni–Co–Cr–Mo alloy in acidic chloride solution

Published online by Cambridge University Press:  02 October 2018

Biaobiao Yang ,
Chenying Shi ,
Yunping Li ,
Qian Lei  and
Yan Nie
Biaobiao Yang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Chenying Shi
Affiliation:
State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, China
Yunping Li*
Affiliation:
State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, China
Qian Lei*
Affiliation:
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
Yan Nie
Affiliation:
YuanMeng Precision Technology (Shenzhen) Institute, Shenzhen 518000, China
*
a)Address all correspondence to these authors. e-mail: lyping@csu.edu.cn
b)e-mail: leiqian@csu.edu.cn
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Abstract

The effect of Cu addition varied from 0 to 4 mass% on the corrosion resistance and electrochemical response in Ni–Co–Cr–Mo alloys was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott–Schottky analysis. Results indicate that the Ni–Co–Cr–Mo alloy with 2 mass% Cu exhibited the most superior corrosion resistance, and the presence of Cu greatly influenced the outer porous layer. The Ni–Co–Cr–Mo alloys’ corrosion resistance was not simply increasing with copper addition increasing from 0 to 4 mass%. The X-ray photoelectron spectroscopy etching analysis was also conducted to illustrate the fraction of Cu at various depths in the passive film, and the results reveal that a maximum limit on Cu content (appropriately 3.10 mass%) existed in the outermost surface in the present condition. Among the studied alloys, the Ni–Co–Cr–Mo–2%Cu alloy formed the thickest passive film with the lowest donor density.

Keywords

alloyCupassivation
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3801 - 3808
Copyright
Copyright © Materials Research Society 2018 

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