论文部分内容阅读
The electroless nickel-phosphor coatings containing molybdenum disulfide nanoparticles were prepared and analyzed in this paper.This composite coating was desired to have the superlubricity of nanosized molybdenum disulfide and anticorrosive property of Ni-P electroless coatings as well.The optimal plating conditions were investigated.The effect of incorporation of MoS2 into the Ni-P coating on the morphology of the coating surface and corrosion properties was also studied.Scanning electron microscopy (SEM) showed that the MoS2 nanoparticles could be dispersed well in the nickel-phosphor matrix.Corrosion tests were conducted in a salt spray box with NaCl solution (3.5 wt.%),and the evaluation of wear resistance was done by weight loss method.The corrosional surfaces were studied and analyzed through optical microscope,X-ray spectrometer (XRD) and scanning electron microscopy (SEM).The investigation on the relationship between heat-treatment and the corrosion resistance of the composite coating showed that the corrosion resistance became worse because of the occurrence of transformation from non-crystalline to crystalline,and then increased the metastable intergradation of the composite coating [1].Meanwhile,the experimental results also showed that corrosion resistance of the coating containing MoS2 was slightly lower than that of coating without MoS2 but higher than that of bare substrate.The corrosion mechanism of the composite coatings was mainly ascribed to the formation of micro-cell around the nanosized MoS2 particles [2],and the active ion like Cl-destroyed the surface film and induced the corrosion to the inside part of coating.