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化学镀NiZnP合金预处理及耐蚀性能研究

作者:时间:2016-04-28点击数:

PDF全文下载:2016020168

黄晓梅, 鞠亚坤, 李一举

 (哈尔滨工程大学 材料科学与化学工程学院,黑龙江 哈尔滨 150001)

 摘要: 对化学镀NiZnP合金的镀前预处理方法进行了研究,通过单因素实验方法研究了主盐硫酸镍浓度、主盐硫酸锌浓度、络合剂乳酸浓度、还原剂次亚磷酸钠浓度、镀液温度、pH值、施镀时间对镀层耐蚀性的影响,观察镀层的微观形貌、研究了镀层的组成成分及晶相结构。结果表明:预镀薄镍层是化学镀NiZnP合金比较适宜的前处理方法,硫酸镍20 g·L-1、硫酸锌6 g·L-1、乳酸20 mL·L-1、次亚磷酸钠24 g·L-1、镀液温度80 ℃、pH值 5、时间 2 h,镀层耐蚀性能良好。镀层为致密的颗粒结构,含锌506%(质量分数),镀层为晶态结构。

 关键词: 化学镀NiZnP合金; 预处理; 耐蚀性; 极化曲线; 交流阻抗

 中图分类号: TG 174.4               文献标志码: A

 Pretreatment and Corrosion Properties Study of Electroless Plating NiZnP Alloy

HUANG Xiaomei,  JU Yakun, LI Yiju

 (CollegeofMaterials Scienceand Chemical Engineering,HarbinEngineeringUniversity,Harbin150001,China)

 Abstract: In this paper, the pretreatment methods of electroless NiZnP alloy plating are investigated. The effects of the concentration of main salt nickel sulfate and zinc sulfate, lactate concentration of complexing agent, sodium hypophosphite concentration of reducing agent, bath temperature, pH value and plating time on the corrosion resistance of coating. Observation of morphology,study on the composition of the coating and crystal phase, the results demonstrate that preplating a thin nickel layer is appropriate pretreatment method for electroless plating NiZnP alloy. When the bath components contain 20 g·L-1 nickel sulfate, 6 g·L-1 zinc sulfate, 20 mL·L-1 lactic acid and 24 g·L-1 sodium hypophosphite, and the bath temperature is 80 ℃, the pH value keeps at 5 and the plating time lasts 2 h, the obtained coating shows excellent performance of corrosion resistance. The obtained coating is a dense grain structure with 5.06% zinc,crystal structure of the coating is amorphous structure.

 Key words: electroless NiZnP alloy; pretreatment; corrosion resistance; polarization curves; alternating current impedance

 收稿日期: 20150101

基金项目: 中央高校基本科研基金项目(HEUCF201403018).

作者简介: 黄晓梅(1970—),女,讲师.

文章编号: 16726987(2016)02016806; DOI: 10.16351/j.16726987.2016.02.010

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