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采用脉冲电镀法在Q235钢表面制备Ni-Cr-Mo合金镀层。利用辉光放电光谱仪(GDS)、扫描电镜(SEM)、Tafel曲线和电化学阻抗谱(EIS)考察了p H值对镀层元素含量、沉积速率、表面形貌和耐蚀性的影响。结果表明:随着p H值的增大,镀层中镍含量先减小后增大,铬先增大后减小,钼含量减小;镀层沉积速率先增大后减小;在3.5%Na Cl溶液中,镀层耐蚀性先增强后减弱。p H值为3.5时,镀层均匀致密,具有最大的自腐蚀电位(-0.535V)、最小的腐蚀电流密度(0.123μA·cm~(-2))和最大的电荷转移电阻(2550Ω·cm~2),此时镀层耐蚀性最好。
Preparation of Ni-Cr-Mo alloy coating on Q235 steel by pulse plating. The effect of p H on the elemental content, deposition rate, surface morphology and corrosion resistance of the coating was investigated by GDS, SEM, Tafel curve and electrochemical impedance spectroscopy (EIS). The results show that with the increase of p H value, the content of nickel in the coating decreases first and then increases, the content of chromium increases first and then decreases, the content of molybdenum decreases; the deposition rate of the coating first increases and then decreases; Cl solution, the corrosion resistance of the coating first increased and then weakened. With a p H value of 3.5, the coating has a uniform and dense coating with the maximum corrosion potential (-0.535V), the minimum corrosion current density (0.123μA · cm -2) and the maximum charge transfer resistance (2550Ω · cm ~ 2), at this time the best corrosion resistance of the coating.