Effect of Heat Treatment Temperature on Corrosion Wear Performance of Nanoparticle-nickel-phosphorus Composite Coating

Nickel-phosphorus-graphene composite coatings were prepared by electroless plating on 45 steel. The microstructure of the composite coating after heat treatment was observed by the equipment such as X-ray diffractometer. The corrosion wear test of the composite coating after heat treatment was carried out by modified UMT-3 multi-purpose corrosion wear tester. The influence of heat treatment on open circuit potential and tribological properties during the abrasion process were studied, and then the corrosion and wear interaction was calculated and analyzed. The results show that the composite coating begin to crystallize after heat treatment at 200 ℃. The composite plating layer is completely crystallized, the corrosion potential shifts positively to -0.571 V, the microhardness increases to 635.8 HV, and the friction coefficient in the 3.5wt% NaCl solution is stabilized at about 0.13 at 400 ℃. The corrosion wear interaction and pure wear are the main causes of material loss. When the composite coating is heated to 500 ℃, cracks in the composite coating increase, the corrosion and wear performance decline sharply, and the amount of corrosion promoting wear reaches more than 98%.