Exploring the Wear Behavior and Corrosion Resistance of Electrodeposited Ni-Co-Fe Ternary Alloy Coatings
摘要
In this paper, the effects of different Fe ion concentrations in electrolyte on the morphology, microstructure, wear resistance, and corrosion behavior of electrodeposited Ni-Co-Fe coating have been studied in detail. The structural characterization shows that all coatings had a face-centered cubic crystal structure. Introduction of Fe element caused a noticeable reduction in grain size and an increase in lattice constant. With the increase in Fe content, wear rate of the coating increases from 1.88 × 10−5 to 3.70 × 10−5 mm3 N−1 m−1 as sliding against Si3N4, while the wear rate of the coating against GCr15 decreases from 27.63 × 10−5 to 1.09 × 10−5 mm3 N−1 m−1. Form the worn surface analysis, it can be found that Ni-Co-Fe coatings exhibit typical abrasive wear mechanism as sliding against Si3N4. As contrast, severe delamination dominated the wear process of the coating sliding against GCr15. In addition, an increase of Fe element weakens the corrosion resistance of the coating, which is related to the high oxidation activity of Fe element. Compared with the pure Ni coating with corrosion current density of 0.4592 μA cm−2, the corrosion current density of Ni-Co-Fe coating can be high to 5.7570 μA cm−2.