Microstructural characterization and corrosion resistance of WC-Ni-Cr-Mo composite – The effect of Mo
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, an...
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Veröffentlicht in: | International journal of refractory metals & hard materials 2020-01, Vol.86, p.105090, Article 105090 |
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Hauptverfasser: | , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0263-4368 |
DOI: | 10.1016/j.ijrmhm.2019.105090 |