Investigation of electrochemical dissolution behavior of Ni(?)/Ni3Al(?') and Co(?)/Co3Al(?') superalloys in NaNO3 solution

被引：17

作者：

Zhao, Liang ^{[1
]}

Zhang, Yan ^{[1
]}

Bian, Haowen ^{[1
]}

Wang, Guoqian ^{[1
]}

Ji, Lei ^{[1
]}

机构：

[1] Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211800, Peoples R China

来源：

CORROSION SCIENCE | 2022年 / 208卷

基金：

中国国家自然科学基金;

关键词：

Electrochemical dissolution behavior; Passive film; Selective corrosion; CORROSION BEHAVIOR; ANODIC-DISSOLUTION; STAINLESS-STEEL; OXIDE-FILMS; INCONEL; 718; ALLOY; TEMPERATURE; IMPEDANCE; COBALT; MICROSTRUCTURE;

D O I：

10.1016/j.corsci.2022.110622

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrochemical dissolution behavior of Ni(gamma)/Ni3Al(gamma'), Co(gamma)/Co3Al(gamma') in NaNO3 electrolyte solution was investigated. Experimental results showed that Al, W, and Ni ions in the gamma' phase destroy the dense oxide film formed by Cr ions in the gamma phase. The different dissolution rates of the gamma' and gamma phases led to selective corrosion on the surface of Ni(gamma)/Ni3Al(gamma'). Cobalt ions reacted with the dense Cr2O3 passivation film to form porous CoCr(2)O4, and the corrosion resistance of the Co(gamma)/Co3Al(gamma') passivation film worsened due to bromination by Br? ions. Qualitative models for the ECM of the Ni(gamma)/Ni3Al(gamma') and Co(gamma)/Co3Al(gamma') are proposed.

引用

页数：15

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