Fretting corrosion of electrolytic NiP coatings

The work considers the effect of additives of hardening submicron silicon carbides and heat treatment on the fretting corrosion in NaCl solution of nickel-phosphorus (NiP) coatings produced by electrolytic deposition. Tests are performed at amplitudes 100 and 500 μm. Pitting reveals the abrasive nature of the wear of all of the studied coatings. Introduction of silicon carbides into NiP coatings increases the number of pits in fretting corrosion. The pitting of NiP coatings is distributed regularly over the subsurface and pits are not so numerous. As the loading grows, fretting corrosion intensifies, though the friction coefficient declines in the majority of cases.