The Tribological Properties and Corrosion Resistance of PPS/PTFE-bronze Coatings Deposited by Electrohydrodynamic Jet Deposition

PPS/PTFE-bronze coatings were prepared by electrohydrodynamic jet deposition on the surface of AISI 1045 steel to improve the tribological property and corrosion resistance of the steel. Three different thicknesses of PPS/PTFE-bronze coatings were prepared to investigate the effect of coating thickness on the coating properties. The surface morphology and surface contact angle of the coatings were measured, and the looseness of the coatings was evaluated using scratch tests. The tribological property and corrosion resistance of PPS/PTFE-bronze coatings with different thicknesses were tested by reciprocating sliding dry friction experiment and electrochemical workstation, respectively. The results showed that the wear rate of the coating filled with irregular tin bronze particles at the thickness of 24 layers was 6.5 times higher than that at the thickness of 12 layers, and the corrosion current density was also doubled. This was because the number of irregular bronze particles increased as the coating thickened, making the cross-linking reaction more obstructed. As a result, the cross-linking density decreased and the coating structure became looser, leading to the decreases in the tribological property and corrosion resistance of the PPS/PTFE-bronze coatings with thickness.