Surface modification of cast iron by means of mechanically tin coating

Abstract

Tribological properties of tin coating on a ductile cast iron surface were evaluated with a ring-on-disc type testing apparatus mated with a quenched carbon steel ring in lubricated condition. The tin coating was carried out using a mechanical plating method, similar to that of a shot peening process. The coating thickness was several micro meter. Results of the friction experiment showed that the friction coefficient and the wear loss were considerably smaller than those of the mirror finished cast alloy surface. In addition, effects of heat treatment and roller burnishing on the tribological properties were investigated. As results, tin layer protected the removal of the piled up graphite was found. Combined effects of graphite and tin on the tribological properties were discussed.