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通过脉冲电镀技术在Q235钢基体上制备出Zn-Ni-Mn合金镀层。研究了电流密度对镀层表面形貌、成分、沉积速率及耐蚀性的影响。结果表明,随着电流密度的增大,沉积速率先增大再减小;镀层中锰含量升高,锌、镍含量降低。随电流密度增加,该镀层随耐蚀性先增强后减弱。电流密度为3.0 A·dm~(-2)时,所得Zn-Ni-Mn合金镀层平整致密,耐蚀性最好。Zn-Ni-Mn合金镀层在3.5%NaCl溶液中的耐蚀性比在5.0%NaOH溶液中更好。
The Zn-Ni-Mn alloy coating was prepared on Q235 steel by pulse plating. The effects of current density on the surface morphology, composition, deposition rate and corrosion resistance of the coatings were investigated. The results show that with the increase of current density, the deposition rate first increases and then decreases. The content of manganese increases and the content of zinc and nickel decreases in the coating. With the increase of current density, the corrosion resistance of the coating first increases and then decreases. The current density of 3.0 A · dm ~ (-2), the resulting Zn-Ni-Mn alloy coating formation and density, the best corrosion resistance. The corrosion resistance of Zn-Ni-Mn alloy coating in 3.5% NaCl solution is better than that in 5.0% NaOH solution.