Corrosion Behavior of WC–10 wt % Ni3Al Composite in Acidic Media


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Resumo

The room temperature corrosion behavior of WC–10 wt % Ni3Al composite and WC–8 wt % Co hardmetal in various acidic solutions (1 M H2SO4, 1 M HCl and 1 M HNO3) were compared and investigated utilizing immersion test, electrochemical measurement and surface analytical techniques. The results show that in H2SO4 solution WC–10Ni3Al composite has a nobler free corrosion potential, lower corrosion current density (Icorr) values and intrinsically better corrosion resistance than WC–8Co. Notably, pseudopassivity was observed in the polarization curves of WC–10Ni3Al in both HCl and H2SO4 solutions. In addition, although WC–10Ni3Al is corroded much faster in HNO3 solution than in the other two mediums, it exhibits a superior corrosion resistance compared to WC–8Co. The corrosion mechanism of WC–10Ni3Al composites is dominated by Ni dissolution.

Sobre autores

Xiaoqiang Li

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming

Email: zhang.ma@hotmail.com
República Popular da China, Guangzhou, 510640

Minai Zhang

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming; Chemical Engineering and Materials Science

Autor responsável pela correspondência
Email: zhang.ma@hotmail.com
República Popular da China, Guangzhou, 510640; Irvine, 92617

Xiaojian Xia

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming

Email: zhang.ma@hotmail.com
República Popular da China, Guangzhou, 510640

Ting Cao

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming

Email: zhang.ma@hotmail.com
República Popular da China, Guangzhou, 510640

Liang Liang

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming

Email: zhang.ma@hotmail.com
República Popular da China, Guangzhou, 510640

Huiyun Li

Dongguan hyperpowder Co. Ltd.

Email: zhang.ma@hotmail.com
República Popular da China, Dongguan, 523808

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