Q690qENH钢暴晒两年的大气腐蚀性能
Corrosion Resistance of Q690qENH Steel Exposed to Atmosphere for Two Years
摘 要
采用鞍钢生产的Q690qENH高强度耐候桥梁钢和对比试样Q345qE桥梁钢在鞍山和鲅鱼圈地区开展2年大气暴晒试验。利用失重法、电化学分析、锈层截面分析和XRD锈层物相分析等手段对暴晒后的试样进行了研究。结果表明，Q690qENH在鞍山和鲅鱼圈2年的腐蚀速率分别为0.014 6 mm/a和0.018 2 mm/a，Q345qE在鞍山和鲅鱼圈2年的腐蚀速率分别为0.018 1 mm/a和0.026 3 mm/a，Q690qENH的耐蚀性优于Q345qE，Q690qENH在海洋大气环境中的自防护效率较高;Q690qENH的阳极过程受到更显著的阻滞，阳极电流小于Q345qE;Q690qENH钢中合金元素铜、镍、铬的局部富集促进保护性锈层形成;具有保护作用的内锈层是Q690qENH高强度耐候桥梁钢的耐蚀性好于Q345qE桥梁钢的主要原因。
大气腐蚀
锈层
high strength bridge weathering steel
atmospheric corrosion
rust layer
Abstract
Atmospheric exposure experiment was carried out in Anshan and Bayuquan areas for 2 years to analyze the corrosion resistance of Q690qENH high strength bridge weathering steel and Q345qE bridge steel made by Ansteel. The mass loss measurement,electrochemicaltesting,rust layer sectional morphology and XRD were used to study the corrosion behavior of the samples after exposure. The results showed that the 2-year corrosion rates of Q690qENH steel were 0.0146mm/a and 0.0182mm/a in Anshan and Bayuquan respectively and the 2-year corrosion rates of Q345 steel were 0.018 1 mm/a and 0.026 3 mm/a respectively. The corrosion resistance of Q690qENH steel was better than that of Q345qE steel. The self-protective efficiency of Q690qENH steel was high in marine atmospheric environment. The anodic process of Q690qENH steel was more significantly blocked and its anodic current was less than that of Q345qE. The part enrichment of Cu,Ni,Cr elements in Q690qENH steel promoted the formation of the protective rust layer. The corrosion resistance of Q690qENH steel was better than that of Q345qE steel mainly due to the protective inner rust layer.
中图分类号 TG172.5 DOI 10.11973/fsyfh-201509016
所属栏目 试验研究
基金项目
收稿日期 2014/9/16
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备注李 琳(1983-),工程师,硕士,从事钢铁材料的腐蚀与防护研究。
引用该论文: LI Lin,ZHONG Bin,GAO Peng,AI Fang-fang,XU Xiao-lian,CHEN Yi-qing,XIAO Yu. Corrosion Resistance of Q690qENH Steel Exposed to Atmosphere for Two Years[J]. Corrosion & Protection, 2015, 36(9): 869
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