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镁合金表面化学镀镍磷工艺优化与镀层性能研究

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  • 1. 西安交通大学城市学院; 2. 西安理工大学材料科学与工程学院
张小欢(1992-),硕士研究生,主要从事化学镀、腐蚀与防护的研究工作,电话:18292446949,E - mail:1520589398@qq.com

收稿日期: 2022-01-23

  修回日期: 2022-03-01

  录用日期: 2022-04-04

  网络出版日期: 2024-01-09

基金资助

陕西省教育厅重点实验室项目(20JS103); 陕西省自然科学基础研究计划(青年项目)(2022JQ - 432)资助

Study on Technology Optimization and Coating Properties of Electroless Ni - P Plating on Magnesium Alloy

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  • 1. Xi’an Jiaotong University City College, Xi’an 710018, China;2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China

Received date: 2022-01-23

  Revised date: 2022-03-01

  Accepted date: 2022-04-04

  Online published: 2024-01-09

摘要

为了提高镁合金表面的硬度和耐蚀性,首先在镁合金表面制备了一层Zn磷化层,然后利用正交试验方法,筛选出适合AZ63镁合金磷化层表面化学镀镍磷的最佳配方,利用扫描电镜(SEM)和电化学等方法分析了最佳镀液配方条件下镀层的表面形貌,成分和耐蚀性等。结果显示,最佳化学镀镀液配方为:硫酸镍7.69×10-2 mol/L,次亚磷酸钠1.70×10-1 mol/L,3.40×10-2 mol/L柠檬酸钠,1.32×10-5 mol/L硫脲,1.80×10-1 mol/L氟化氢铵;施镀条件为pH=8,T=80 ℃,t=1 h;最佳镀液配方下所得镀层的沉积速率达26 μm/h以上,制备镀层硬度达648 HV,约为镁合金的5倍,镀层中镍元素含量为90.55%,磷元素含量为9.45%,在3.5%的NaCl溶液中自腐蚀电位高达-0.66 V,自腐蚀电流密度仅为1.25×10-5 A/cm2

本文引用格式

张小欢, 冯拉俊, 卢曼 . 镁合金表面化学镀镍磷工艺优化与镀层性能研究[J]. 材料保护, 2022 , 55(6) : 86 -91 . DOI: 10.16577/j.issn.1001-1560.2022.0159

Abstract

In order to improve the hardness and corrosion resistance of the magnesium alloy surface, a Zn phosphating film was prepared on the surface first. And then, the optimum formula for electroless Ni - P plating on the phosphating film of AZ63 magnesium alloy was determined through orthogonal test. Subsequently, the surface appearance, composition and corrosion resistance of the coating prepared with optimum formula were analyzed by scanning electron microscope (SEM) and electrochemical methods. Results showed that the optimum bath formula for electroless plating was as follow: nickel sulfate 7.69×10-2 mol/L, sodium hypophosphite 1.70×10-1 mol/L, sodium citrate 3.40×10-2 mol/L,thiourea 1.32×10-5 mol/L and ammonium bifluoride 1.80×10-1 mol/L with a plating condition of pH=8, T=80 ℃ and t=1 h. In case of the optimal formula, the plating rate of coating was above 26 μm/h; the hardness of the coating was 648 HV, about 5 times of that of magnesium alloy; the nickel and phosphor content of the coating were 90.55% and 9.45% respectively; and the corrosion potential of the coating was up to -0.66 V in 3.5% NaCl solution with a corrosion current density of only 1.25×10-5 A/cm.
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