Environmentally Friendly Electrodeposited Ni-Mo-B Coatings for Tribocorrosion Applications

Keywords

electrodeposited Ni-Mo-B coatings; tribocorrosion; corrosion resistance; micromechanical properties.

Abstract

Corrosion-resistant Ni-Mo-B electrodeposited coatings were produced from a self-regulating suspension electrolyte, and the effect of deposition parameters on their composition, structure, and properties was examined. The coatings exhibit a fine-grained structure, contain 8–27 wt.% Mo and 1.30–3.39 wt.% B, and are free of pores and cracks. An increase in molybdenum content improves corrosion resistance in chloride media. Micromechanical properties were evaluated using scratch testing and nanoindentation, while tribological and tribocorrosion behavior was studied using a “plane–ball” scheme in air and in 3% NaCl solution. It was established that coatings with 8 wt.% Mo are more effective under dry friction, whereas coatings with 16 wt.% Mo perform better under tribocorrosion loading. Ni-Mo-B coatings are considered as an environmentally friendly alternative to hard chromium.

References

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