With the use of the high-power laser, the corrosion resistance performance of the surface of the laser-cladding stainless steel column reduced. In order to investigate the corrosion causes while high-power laser cladding technology being applied, 3, 6 and 8 kW laser with various energy density were used to prepare samples, and neutral salt spray test was conducted. And then, electrochemical corrosion, microstructure analysis, energy spectrum detection and micro hardness detection were carried out on typical samples. The results showed: during the laser cladding process, the higher the energy density was, the greater the difference of the microstructure in the cladding layer was, and the worse the corrosion resistance performance was; at various power density, the content of Cr in the cladding layer differed little, while with the increase in the energy density of laser cladding, the segregation of Cr got worse and worse, thus more carbide formed, average hardness of the cladding layer got higher and the corrosion resistance performance got worse.%随着高功率激光器的使用,激光熔覆不锈钢立柱表面抗腐蚀性能降低的问题多有显现,为探讨高功率激光器熔覆工艺下的锈蚀原因,使用能量密度不同的3、6、8 kW激光器进行试样制备,通过中性盐雾试验选取典型试样进行电化学腐蚀、金相组织分析、能谱检测、微观硬度检测.结果表明,激光熔覆过程中能量密度越高,熔覆层显微组织差异越大,且耐蚀性能越差;不同功率密度下,熔覆层中的Cr平均含量无明显差异,但随着激光熔覆能量密度增大,Cr偏析越严重,形成碳化物越多,熔覆层平均硬度越高,耐蚀性能越差.
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