IJPEM
Wear and Corrosion Resistance of 304SS Coating Using High Speed Laser Cladding
Peicheng Peng, Shuisheng Chen/Henan Polytechnic University
- Keywords : High speed laser cladding, Stainless steel coating, Microscopic structure, Polarization curve, Residual stress
- To improve the wear and corrosion resistance of hydraulic support cylinder, 304SS coating was prepared on the working surface of the 27SiMn steel by high-speed laser cladding. Subsequently, post-processing was carried out for the coating using a hybrid process of scraping and rolling (SR). The macro and microstructures, microhardness distribution, wear and corrosion resistances and the residual stress distribution of the coating were examined. The results show that the coating, with low dilution rate, is uniform and dense without cracks and pores. Compared with the substrate, the SR processed coating increases by 63.1% in hardness, decreases by 80.98% in the mass loss of the coating, by 22.64% in the friction coefficient, and by 75.70% and 46.15% in the depth and width of wear marks, respectively. The corrosion potential of the coating shifts positively by 210 mV, the corrosion current density decreases by an order of magnitude, and the polarization resistance increases by about 1.6 times, respectively. It is found that the compressive residual stress present in the SR processed coating surface. And along the depth direction, the compressive stress decreases and gradually transforms into tensile stress, reaching its maximum value at the interface. Come to a conclusion that the high hardness, low friction coefficient, good wear and corrosion resistance of the coating can be obtained. And the residual stress of the coating surface is compressive stress, reducing the cracking tendency. Thus, the service life of hydraulic supports can be improved significantly by high-speed laser cladding 304SS coating.
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