Abstract
The influence of the microstructural transformations upon heat treatments on the wear resistance of Fe-W coatings is studied. The coatings are electrodeposited from a glycolate-citrate plating bath with 24 at.% of W, and the wear resistance is investigated under dry friction conditions using ball-on-disc sliding tests. The samples were annealed in Ar atmosphere at different temperatures up to 800 °C. The microstructural transformations were studied by means of X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Electron Backscattered Diffraction (EBSD) technique. Except for the coating annealed at 800 °C, all the tested coatings suffered severe tribo-oxidation which resulted in the formation of deep cracks, i.e., ~15 μm in depth, within the wear track. The precipitation of the secondary phases, i.e., Fe2W and FeWO4, on the surface of the sample annealed at 800 °C increased the resistance to tribo-oxidation leading to wear tracks with an average depth of ~3 μm. Hence, the Fe-W coating annealed at 800 °C was characterized with a higher wear resistance resulting in a wear rate comparable to electrodeposited hard chromium coatings, i.e., 3 and 4 × 10−6 mm3/N m, respectively.
Highlights
In the field of coatings for protective applications, the attempt to find a sustainable alternative to hard chromium coatings is still under investigation
Hard chromium coatings are characterized by high hardness, as well as wear and corrosion resistance, but their production involves the use of carcinogenic compounds (i.e., Cr6+ )
Surface morphology including an insert of the surface acquired at higher magnification; and (b) including an insert of the surface acquired at higher magnification; and (b) cross-section
Summary
In the field of coatings for protective applications, the attempt to find a sustainable alternative to hard chromium coatings is still under investigation. Among W alloys, Fe-W has especially seen much attention recently, due to the need to produce and develop sustainable materials [5]. Fe-W alloys can be electrodeposited from environmentally friendly and thermodynamically stable electrolytes [6] with tunable composition and structure [7] and with high hardness and thermal stability [8,9].
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