TY - JOUR
T1 - Microstructure and Corrosion Behavior of Re-Added Cemented Carbides in Simulated Seawater
AU - Jing, Kaifeng
AU - Guo, Zhixing
AU - Xiong, Ji
AU - Liu, Jianping
AU - Peng, Hao
N1 - Publisher Copyright:
© 2023, The Minerals, Metals & Materials Society and ASM International.
PY - 2023/6
Y1 - 2023/6
N2 - WC-10(Co-xRe) cemented carbides were prepared by vacuum sintering. The addition of Rhenium (Re) resulted in the grain refinement and martensite phase transition of cemented carbides. Additionally, increased grains and phase boundaries were observed in the cemented carbides using SEM and electron back-scattered diffraction (EBSD), leading to increased corrosion sites and corrosion current (Icorr). However, the corrosion voltage (Ecorr) of the cemented carbides containing Re increased due to Re’s higher standard electrode potential compared to Cobalt (Co). An excessive amount of Re led to the precipitation of the secondary phase in the cemented carbides, which formed new galvanic batteries between different phases. In the WC-9Co-1Re cemented carbide, a maximum charge transfer resistance of 1183.0 Ω cm2 was achieved. The passivation film, composed of Co(OH)2 and Co3O4, isolated the cemented carbide from the corrosive medium, thereby inhibiting further corrosion. Primary corrosion mechanisms involved the dissolution of the Co binder phase and exfoliation of the WC grains. The optimal corrosion resistance was obtained by adding 1 wt pct of Re to the cemented carbide.
AB - WC-10(Co-xRe) cemented carbides were prepared by vacuum sintering. The addition of Rhenium (Re) resulted in the grain refinement and martensite phase transition of cemented carbides. Additionally, increased grains and phase boundaries were observed in the cemented carbides using SEM and electron back-scattered diffraction (EBSD), leading to increased corrosion sites and corrosion current (Icorr). However, the corrosion voltage (Ecorr) of the cemented carbides containing Re increased due to Re’s higher standard electrode potential compared to Cobalt (Co). An excessive amount of Re led to the precipitation of the secondary phase in the cemented carbides, which formed new galvanic batteries between different phases. In the WC-9Co-1Re cemented carbide, a maximum charge transfer resistance of 1183.0 Ω cm2 was achieved. The passivation film, composed of Co(OH)2 and Co3O4, isolated the cemented carbide from the corrosive medium, thereby inhibiting further corrosion. Primary corrosion mechanisms involved the dissolution of the Co binder phase and exfoliation of the WC grains. The optimal corrosion resistance was obtained by adding 1 wt pct of Re to the cemented carbide.
UR - http://www.scopus.com/inward/record.url?scp=85149973765&partnerID=8YFLogxK
U2 - 10.1007/s11661-023-07028-6
DO - 10.1007/s11661-023-07028-6
M3 - Journal article
AN - SCOPUS:85149973765
SN - 1073-5623
VL - 54
SP - 2410
EP - 2420
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 6
ER -