Abstract: Nanocrystalline Ni-Fe alloy coatings with a higher chemical in Ni and lower in Fe on brass were prepared by DC electrodeposition technology.The effects of different Fe²⁺ concentration (ranging from 2 g/L to 12 g/L)on surface morphology,chemical composition,phase structure,micro-hardness and corrosion resistance of the coating were studied.Experimental results show that the Ni-Fe alloy coating is nano-crystalling,and the Fe²⁺ concentration of about 4g/L has the highest hardness of about 658 HV.For the Fe²⁺ concentration of about 12g/L,the coating exhibits the best corrosion resistance in 3.5% NaCl solution,with the corrosion current density of about 0.430 µA/cm2 and the coating resistance of about 143400Ω,respectively,which is about 40 times less than that of brass substrate.

Key words: Nickel-iron alloy , Nanocrystalline , Electroplating , Corrosion resistance

摘要： 采用直流电沉积技术在黄铜基体上制备出低Fe高Ni的纳米晶Ni-Fe合金镀层。研究不同Fe²⁺ 质量浓度(2~12g/L)对合金镀层的表面形貌、镀层成分、相结构、镀层显微硬度和耐蚀性的影响规律。实验结果表明,电镀Ni-Fe合金可获得纳米晶结构,当Fe²⁺ 质量浓度为4g/L时,硬度较高,为658HV。在质量分数为3.5%的NaCl溶液中,Fe²⁺ 质量浓度为4g/L时,合金镀层的耐蚀性最好,自腐蚀电流密度较小,约为0.430µA/cm²,涂层电阻较大,约为143400Ω,比基体黄铜提高约40倍。

关键词: 镍铁合金 , 纳米晶 , 电沉积 , 耐蚀性