Wear Behavior of APS Deposited Cr2O3 Coating in Aqueous Media
Y. Kucuk Mustafa Sabri Gök Mecit Oge
AbstractIn this research, sliding wear behavior of Cr2O3 (Metco 6156) coating, deposited onto AISI 420 specimens prepared in a cylindrical form (Ø25x8 mm) using atmospheric plasma spray (APS) methods, was evaluated in water environment. For this purpose, Cr2O3 powder, obtained from Sulzer Metco with commercial code Metco 6156 was deposited on AISI 420 stainless steel substrates. Wear mechanisms were interpreted using SEM analyses and 3D profilometer measurements of the samples worn in aqueous media. Adhesive wear behaviors of the coating were comparatively evaluated for dry and aqueous conditions using the same test parameters. The average friction coefficient value was found as 0.3 under dry conditions, whereas this value was found to be nearly 30% lower after the tests in water. SEM micrographs of the worn surfaces show that, the effect of plastic deformation was reduced in water. Also, the amount and lengths of the cracks forming on the worn surface were found to be lower than those of dry conditions, and such cracks resulted in fatigue induced de-bonding.