INVESTIGATE THE EFFECT OF PHOSPHATE SURFACE COATING ON THE FATIGUE PERFORMANCE OF THE PISTON PIN MATERIALS

Piston pin play a vital role in the reciprocating internal combustion engine. Failure of piston pin will result in failure of engine. Improper carburizing technology leads to decarburization of surface decreases intensely the fatigue strength of surface so that crack initiated from the surface and propagated, at last fatigue fracture occurred. Every effort has to be made to improve fatigue properties of piston pin and when it is necessary to upgrade the sliding characteristics and wear resistance of metal surface, coating can often be used effectively without sacrificing any of the major property requirements of the substrate material. In this work, the investigation effect of phosphating surface coating on piston pin of different material is studied by using design of experiments. In the present work, improvement in fatigue life is obtained by manganese phosphating process with optimizing parameters The ANOVA and F test are used to analyze the results.