电沉积Ni-Sn-Mn非晶镀层镀液组分优化及耐蚀性

发布时间：2018-02-21 14:16

本文关键词： 脉冲电沉积 Ni-Sn-Mn非晶镀层镀液组分相结构耐蚀性　出处：《中国表面工程》2017年06期 　论文类型：期刊论文

【摘要】：为了提高低碳钢在海洋环境中的耐蚀性,采用脉冲电沉积技术在Q235钢表面制备Ni-Sn-Mn合金镀层,通过正交试验方法对镀液组分进行优化。利用扫描电镜(SEM)及附带的能谱仪(EDS)、X射线衍射仪(XRD)、Tafel曲线和电化学阻抗谱(EIS)等方法对镀层表面形貌、元素含量、相结构及耐蚀性进行分析。结果表明:脉冲电沉积Ni-SnMn镀层最优镀液组分为:10 g/L SnCl_2·2H_2O、55 g/L NiSO_4·6H_2O、50 g/L MnSO_4·H_2O和160 g/L Na_3C_6H_5O_7·2H_2O。最优镀液组分条件下制备的镀层为非晶态结构,镀层表面胞状颗粒均匀致密。镀层中Ni、Sn、Mn的质量分数分别为68.59%、21.57%、9.84%。与Ni-Sn镀层相比,Ni-Sn-Mn镀层在3.5%NaCl溶液中的自腐蚀电位(-0.346 V)更正,自腐蚀电流密度(2.816×10~(-8) A/cm~2)更低,电荷转移电阻(12 580Ω·cm~2)更大,耐蚀性更好。
[Abstract]:In order to improve the corrosion resistance of low carbon steel in marine environment, Ni-Sn-Mn alloy coating was prepared on Q235 steel surface by pulse electrodeposition. The composition of plating solution was optimized by orthogonal test. The surface morphology and element content of the coating were determined by SEM (SEM) and EDSX ray diffractometer (EIS), the Tafel curve and electrochemical impedance spectroscopy (EIS). The phase structure and corrosion resistance of the Ni-SnMn coating were analyzed. The results showed that the optimal bath composition of pulsed electrodeposition Ni-SnMn coating was as follows: 1: 10 g / L SnCl_2 路2H _ 2H _ 2O 55 g / L NiSO_4 路6H _ 2O _ 2O 50 g / L MnSO_4 路H _ 2O and 160g / L Na_3C_6H_5O_7 路2H _ 2O. Compared with Ni-Sn coating, the self-corrosion potential of Ni-Sn-Mn coating in 3.5% NaCl solution was corrected to -0.346 V, and the self-corrosion current density was 2.816 脳 10 ~ (-8) A 路cm ~ (2) 2), and the charge transfer resistance (12 580 惟路cm ~ (2)) was higher than that of Ni-Sn coating. Better corrosion resistance.
【作者单位】：华北理工大学冶金与能源学院;
【基金】：国家自然科学基金(51474088)~~
【分类号】：TQ153

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