The effect of Cr content on the corrosion resistance of WC-Ni-Cr-Mo composites

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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.

keywords

STAINLESS-STEELS; ANION TYPE; CO; BEHAVIOR; NICKEL; HARDMETALS; TOUGHNESS; CHLORIDE; SURFACE; FILMS

subject category

Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

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

our authors

no photo

Alexandre Manuel Ferro Rocha

PhD Student
foto Ana Maria de Oliveira e Rocha Senos

Ana Maria de Oliveira e Rocha Senos

Collaborator
foto António Alexandre Cunha Bastos

António Alexandre Cunha Bastos

Assistant Researcher
no photo

Cristina Maria da Silva Fernandes

Collaborator
foto João Pedro Veleirinho Cardoso

João Pedro Veleirinho Cardoso

PhD Student
foto Mário Guerreiro Silva Ferreira

Mário Guerreiro Silva Ferreira

Retired Professor

Groups

G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings

Projects

HARDCorr - Desenvolvimento de metal duro com elevada resistência ao desgaste e à corrosão (HardCorr)

CICECO - Aveiro Institute of Materials (UID/CTM/50011/2019)

acknowledgements

This research work was financed by Portugal 2020 through European Regional Development Fund (FEDER) in the frame of Operational Competitiveness and Internationalization Programme (POCI) and the scope of the project HARDCorr (POCI-01-0247-FEDER-003382). This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES.

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Publication Details

type
Journal Article
year
2021
journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
volume
95
article number
105434
publisher
ELSEVIER SCI LTD
issn
0263-4368
isbn
2213-3917
digital object identifier
10.1016/j.ijrmhm.2020.105434
web of science article identifier
WOS:000612827700004

Journal Metrics (JCR 2019)

Journal Impact Factor
3.407
Journal Impact Factor (5 yrs)
3.414
category normalized journal percentile
74.963

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