Microstructural characterization and corrosion resistance of WC-Ni-Cr-Mo composite - The effect of Mo
authors Santos, RF; Rocha, AMF; Bastos, AC; Cardoso, JP; Rodrigues, F; Fernandes, CM; Sacramento, J; Ferreira, MGS; Senos, AMR; Fonseca, C; Vieira, MF; Malheiros, LF
nationality International
journal INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
author keywords Metal matrix composites; WC; Microstructure; Acid corrosion; Passivity; Mo
keywords AUSTENITIC-STAINLESS-STEELS; PITTING CORROSION; FERRITIC-STAINLESS; BIPOLAR MODEL; GRAIN-SIZE; BEHAVIOR; CO; MOLYBDENUM; HARDMETALS; ADDITIONS
abstract 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%.
publisher ELSEVIER SCI LTD
issn 0263-4368
year published 2020
volume 86
digital object identifier (doi) 10.1016/j.ijrmhm.2019.105090
web of science category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000500378200013
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journal impact factor 3.407
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