The effect of Cr content on the corrosion resistance of WC-Ni-Cr-Mo composites
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; OCP; EIS; Acid corrosion; Cr
keywords STAINLESS-STEELS; ANION TYPE; CO; BEHAVIOR; NICKEL; HARDMETALS; TOUGHNESS; CHLORIDE; SURFACE; FILMS
abstract Ni-Cr-Mo is a candidate to substitute Co binders in WC-based composites, where high corrosion resistance is required. This work focused on the effect of Cr on the corrosion susceptibility of WC-Ni-Cr-Mo composites, in acid media. Specimens were produced by powder metallurgy followed by microstructural, chemical and mechanical characterization. Open circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were employed to evaluate the corrosion susceptibility of WC-Ni-Cr-Mo alloys with different Cr content. The results highlight the greater aggressiveness of chloride medium compared to sulphate environment, and reveal that Cr can effectively decrease corrosion susceptibility without hampering the mechanical properties in both media, especially in chloride solution, where major improvements are observed.
publisher ELSEVIER SCI LTD
issn 0263-4368
isbn 2213-3917
year published 2021
volume 95
digital object identifier (doi) 10.1016/j.ijrmhm.2020.105434
web of science category 7
subject category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000612827700004

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