Effects of Anodizing from Phosphate and Ammonium Electrolytic Solution and PTFE Particle Composite on Tribological Properties of AZ91D Magnesium Alloy

Abstract

Using a horizontal reciprocating friction and wear test apparatus, this study evaluated the effects of PTFE particle composite and electrolysis conditions on friction and wear properties of AZ91D magnesium alloy treated with anodization from a phosphate and ammonium electrolytic solution against the SUJ2 steel ball. Wear loss of the AZ91D magnesium alloy anodized from the phosphate and ammonium solution was greatly reduced in comparison with no surface treatment, but the alloy's friction coefficient was high. The PTFE particle composite used as the coating was produced to lower the friction coefficient in the early stage of testing. Moreover, the coating was smoothed and hardened using AC electrolysis to lower the friction coefficient.