Influence of μ-size WC on the Corrosion Behavior of Ultrafine WC/WC-Co Cemented Carbides

被引：0
作者：
Chao Liu
Yang Liu
Yunzhu Ma
Wensheng Liu
Yuehui He
机构：
[1] Central South University,State Key Laboratory of Lightweight and High Strength Structural Materials
来源：
Journal of Superhard Materials | 2019年 / 41卷
关键词：
cemented carbides; electrochemical behavior; corrosion mechanism;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The electrochemical behavior of ultrafine WC/μ-WC-Co alloy with different grain sizes of WC particles was investigated in 1M HCl and 1M NaOH solutions using potentiodynamic polarization and surface analytical techniques. Good linear grain size dependence existed for the corrosion current density (Icorr). Alloys with smaller WC exhibited better corrosion resistance. Addition of μ-size WC particles can weaken the corrosion resistance of ultrafine WC/μ-WC-Co cemented carbide. The corrosion mechanism is discussed based on the SEM and EDS analysis. The predominant dissolution of the Co particles as the binder phase in HCl solution as well as WC matrix remained at the tangent surface. The benefits of Co(OH)2 protective film can only be utilized in alkaline solution.
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页码：334 / 344
页数：10
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