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XPS and AES surface analysis of WC‐Co‐(Cr) cemented carbide after immersion in neutral solution
Author(s) -
Wei Xiuyu,
Jin Peng,
Xia Yanping,
Long Jianzhan,
Zhang Weibing,
Xu Tao,
Cao Yu
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6890
Subject(s) - corrosion , dissolution , cemented carbide , carbide , immersion (mathematics) , alloy , materials science , metallurgy , oxide , chromium , x ray photoelectron spectroscopy , chromium carbide , phase (matter) , inorganic chemistry , chemistry , chemical engineering , mathematics , pure mathematics , engineering , organic chemistry
The binder phase Co in WC‐Co cemented carbide is dissolved easily in corrosive media (even in neutral solution), which has limited its application in a wider range. In this paper, the influence of Cr on corrosion resistance of WC‐Co immersed in neutral solution was studied, with a focus on the surface chemistry of the corrosion product. The results show that in neutral solution, the corrosion is mainly caused by the selective dissolution of Co and the dominant surface corrosion product after immersion is Co (OH) 2 . The corrosion resistance of WC‐Co cemented carbide can be improved by the addition of Cr. This can be explained by the formation of more protective chromium containing oxide on the binder phase of WC‐Co‐Cr alloy, leading to reduced corrosion rate.