稀土-Ni-W-P-SiC脉冲复合镀层的耐蚀性研究

材料热处理学报, 2007, 28(3): 116-120. doi: 10.3969/j.issn.1009-6264.2007.03.027

稀土-Ni-W-P-SiC脉冲复合镀层的耐蚀性研究

张欢 ^1, , 郭忠诚 ^2, , 蒋琪英 ^3, , 胡文远 ^4, , 唐敬友 ^5, , 樊北旭 ^6,

1.西南科技大学材料学院,四川,绵阳,621002

2.昆明理工大学材料与冶金学院,云南,昆明,650093

3.西南科技大学材料学院,四川,绵阳,621002

4.西南科技大学材料学院,四川,绵阳,621002

5.西南科技大学材料学院,四川,绵阳,621002

6.西南科技大学材料学院,四川,绵阳,621002

基金项目: 国家发展与改革委员会高技术产业化计划(计高技[2002]24号)

关键词：脉冲 , 稀土-Ni-W-P-SiC复合镀层 , 耐蚀性

Study on corrosion resistance of RE-Ni-W-P-SiC composite coating prepared by pulsing current plating

采用腐蚀溶液浸泡、绘制阳极极化曲线和中性盐雾试验三种方法研究了稀土(RE)-Ni-W-P-SiC脉冲复合镀层的耐蚀性.结果表明:无论是在镀态条件下还是在400℃热处理条件下,脉冲RE-Ni-W-P-SiC镀层在各腐蚀溶液中的耐蚀性均优于相应的直流镀层,更优于不锈钢(1Cr18Ni9Ti);镀层在HCl、H2SO4、H3PO4溶液中的腐蚀速率都比较低,而镀层在FeCl3溶液中的腐蚀速率远大于前三者;脉冲频率f=33Hz,占空比r=0.6时获得的镀层具有较好的耐腐蚀性.表面形貌分析表明稀土-Ni-W-P-SiC脉冲镀层比其直流镀层平整细腻;相结构分析表明脉冲镀层经400℃热处理后非晶态减少并产生Ni3P新相.

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