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