Study on Microstructure and Properties of Iron Based Alloy Coating by Arc Spraying

Arc thermal spraying technology was used for the preparation of iron-based 08Mn2Si coating in automobile engine cylinder wall. Scanning electron microscopy (SEM) was used for the analysis of organizational characteristics of coating. The check agent (DPT-5) that was used to simulate oil was blotted out on the coating surface to study its permeability mechanism in pores. Under the wet and dry environment, the authors use the material with high temperature friction, wear tester to analyze the abrasion resistance and compare the result of grey cast iron. The research showed that the coating was constituted by flat particles which stacked on the base and presented a similar topology structure. Oxide strip was found between the particles. Unmelted particles, pores and cracking were the same as oxide strip in distribution. Pores were connected with each other by the gaps. The abrasion resistance of coating was better than grey cast iron in dry friction environment when seemed to be the same in oil friction. FeO and pores that existed in the coating were contributed to the anti-friction effect.