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采用脉冲电镀法在Q235钢表面制备Ni-Cr-Mn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),考察了添加剂对镀层元素含量、沉积速率、镀层外观、表面形貌和耐蚀性的影响。结果表明:随添加剂含量的增大,镀层中镍含量降低,铬、锰含量增加;沉积速率先增大后减小;镀层外观光亮度先升高后降低;晶粒尺寸先减小后增大;在3.5%Na Cl溶液中,镀层耐蚀性先增强后减弱。添加剂含量为10 ml/L时,镀层致密均匀,具有最大的腐蚀电位(-0.363 V)、最小的腐蚀电流密度(8.829×10-8A·cm-2)和最大的电荷转移电阻(2737Ω·cm~2),耐蚀性最好。
Preparation of Ni-Cr-Mn alloy coating on Q235 steel surface by pulse plating. The effects of additives on the elemental content, deposition rate, appearance, surface morphology and corrosion resistance of the coating were investigated by GDS, SEM, Tafel curve and electrochemical impedance spectroscopy (EIS). The results show that with the increase of additive content, the content of nickel decreases, while the content of chromium and manganese increases; the deposition rate increases first and then decreases; the appearance brightness of the coating first increases and then decreases; the grain size decreases first and then increases In 3.5% NaCl solution, the corrosion resistance of the coating first increases and then decreases. When the additive concentration is 10 ml / L, the coating has a dense and uniform coating with the maximum corrosion potential (-0.363 V), the minimum corrosion current density (8.829 × 10 -8 A · cm -2) and the maximum charge transfer resistance (2737 Ω · cm ~ 2), the best corrosion resistance.