摘要
通过自然浸泡、动电位极化、电化学阻抗谱技术研究了电弧喷涂Zn、Zn15Al和316L不锈钢三种单层涂层和底层Zn或Zn15Al表层316L两种双层复合涂层喷涂试样在鹰潭酸性土壤模拟液中的腐蚀速率和腐蚀行为,以确定适合预应力高强混凝土管桩(PHC管桩)金属端头抗华南酸性土壤腐蚀的涂层体系.结果表明:Zn、Zn15Al、Zn-316L和Zn15Al-316L涂层均能明显抑制基体Q235钢的腐蚀;Zn和Zn15Al涂层表面的腐蚀产物膜致密且与涂层牢固结合,其耐蚀性指标随腐蚀时间延长而明显变好;腐蚀中后期Zn15Al涂层的耐蚀性指标稍优于Zn涂层;316L涂层的耐蚀性随腐蚀时间延长而急剧下降.
Three kinds of single layer coatings of Zn,Zn15Al,316L stainless steel and two kinds of double layer coatings with inner layer of Zn or Zn15Al and outer layer of 316L by arc spraying were developed to protect the metal ends of prestressed high-strength concrete（PHC） pipe piles against acid soil corrosion in south China.The corrosion behaviors of the coated Q235 steel samples in simulated Yingtan acid soil solution were investigated by natural immersion,potentiodynamic polarization and electrochemical impedance spectroscopy（EIS） tests.The results show that the corrosion of the matrix Q235 steel is effectively inhibited by Zn,Zn15Al,Zn-316L and Zn15Al-316L coatings.The corrosion products on Zn and Zn15Al coated samples are compact and firm.The corrosion resistance indexes of both Zn and Zn15Al coated samples are improved significantly with corrosion time,and those of the latter are a little superior to those of the former.But the corrosion resistance of 316L coated samples is decreased quickly with immersion time.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2010年第5期729-734,共6页
Materials Science and Technology
基金
中国博士后科学基金面上资助项目(20080440043)
广东省教育部科技部企业科技特派员行动计划项目(2009B090600106)
广东三和管桩有限公司资助项目
关键词
电弧喷涂
锌
不锈钢
土壤
腐蚀
电化学
arc sprayed zinc stainless steel soil corrosion behavior electrochemical
