부산대학교 도서관

WC-Ni-Cr-Mo are good candidates for replacing WC-Co for its better corrosion performance. This work investigated the effect of different Mo content on the mechanical properties and corrosion susceptibility of WC-Ni-Cr-Mo composites in chloride and sulphate acidic media. Chemical, microstructural, and electrochemical analysis were performed. Results show chlorides are frankly more aggressive than sulphates, but additions of up to 0.6 wt% in Mo can enhance the active-passive transition, particularly in the presence of chlorides, and guarantee the passive state in sulphates. Also, Mo was effective in hindering WC grain growth and in increasing hardness in 5%, simultaneously reducing toughness in 4%. • Microstructure of WC-Ni-Cr-Mo composite. • Mo additions up to 0.6 wt% can improve corrosion resistance. • Intermediate Mo additions can have detrimental impact on corrosion susceptibility. • Chlorides are expressively more aggressive than sulphates to the binder phase. • Mechanical properties do not change significantly. [ABSTRACT FROM AUTHOR]