奥氏体不锈钢表面等离子渗锆合金层的抗酸腐蚀性研究  

Research on acid corrosion resistance of Zr-alloyed layer formed on stainless steel by plasma technique

作　　者：陆小会[1] 高原[1] 韦文竹[1] 张光耀[1] 蔡航伟[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2014年第2期168-172,共5页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(51201043);广西科学研究与技术开发计划(桂科攻12118020-2-2-1)

摘　　要：为提高0Cr18Ni9Ti奥氏体不锈钢在特殊应用环境的耐酸腐蚀性能,采用双辉等离子渗金属技术在不锈钢基体表面渗锆,对渗锆合金层的相结构进行检测分析,将奥氏体不锈钢基体试样和表面渗锆试样分别在0.5 mol/LH2SO4溶液、0.5mol/L HNO3溶液、0.5 mol/L HCl溶液进行电化学腐蚀对比试验。结果表明:在H2SO4溶液、HNO3溶液、HCl溶液中,不锈钢基材的相对腐蚀速度分别是渗锆合金层的2.18倍、9.73倍、24.43倍;不锈钢基体表面腐蚀较为严重,而渗锆合金层表面仅出现轻微的局部腐蚀坑。奥氏体不锈钢表面渗锆后,渗锆合金层中合金元素呈梯度分布,且腐蚀时在表面形成了一层致密的氧化锆钝化膜,因而其抗酸腐蚀性能相对基体大幅提升,在HCl溶液比在H2SO4溶液和HNO3溶液中耐蚀效果更明显。A zirconium modified surface alloying layer was prepared on 0Cr18Ni9Ti stainless steel by double-glow plasma sur-face alloying technology to improve the acid resistance of stainless steel in the special environment,and the structure of Zr-alloyed layer was examined,then an electrochemical corrosion comparison test of stainless steel substrate and Zr-alloyed lay-er samples were taken in 0.5 mol/L H2 SO4 ,0.5 mol/L HNO3 and 0.5 mol/L HCl solution.The results show that the cor-rosion rate of stainless steel sample are 2.18,9.73,24.43 times as the Zr-alloyed layer in H2 SO4 ,HNO3 ,HCl solution;Surface corrosion of stainless steel sample is more serious,and only minor localized corrosion pitting is on the surface of Zr-alloyed layer sample.Alloying elements in the Zr-alloyed layer presents gradient distribution and a dense zirconium oxide passivation film is formed on its surface,so acid corrosion resistance of Zr-alloyed layer is improved significantly compared to the stainless steel substrate and it′s more obvious in HCl solution than in the HNO3 ,H2 SO4 solution.

关 键 词：等离子渗金属技术 渗锆合金层 耐酸腐蚀性能 

分 类 号：TG156.8[金属学及工艺—热处理]