工艺和组织对桥梁钢在模拟海洋飞溅区环境中腐蚀行为的影响
Effect of Technology and Microstructure on Corrosion Behavior of Bridge Steels in Simulated Ocean Splash Zone Environment
摘 要
采用电化学测试和模拟飞溅区腐蚀试验研究了不同工艺制造的桥梁钢在模拟海水环境中的腐蚀行为, 并与模拟全浸区的腐蚀速率进行了对比。结果表明, 经回火处理后的桥梁钢, 组织由粒状贝氏体非平衡组织向回火索氏体平衡组织转变, 晶粒细化、组织更为均匀, 因此在模拟海洋飞溅区环境中具有更好的耐腐蚀性能; 模拟飞溅区的腐蚀速率约为模拟全浸区的6～10倍, 模拟飞溅区腐蚀速率高的原因除了外在的环境因素外, 具有还原作用的锈层与钢基体构成的局部电池形成开路以及腐蚀坑内外的电位差也是主要因素。
工艺
组织
海洋飞溅区
腐蚀
bridge steel
technology
microstructure
ocean splash zone
corrosion
Abstract
The corrosion behaviors of bridge steels with different manufacturing technologies were investignated by electrochemiscal method and simulated splash corrosion test, and the corrosion rates of the steels in simulated splash and full immersion zone corrosion tests were compared. The results showed that the microstructure of the samples changed from non-equilibrium granular bainite to equilibrium temper sorbite after tempering. Because of the grain refinement and uniformity of structure, the corrosion resistance of temper sorbite microstructure was better than that of granular bainite microstructure in simulated ocean splash zone. The corrosion rate in simulated ocean splash zone was 6-10 times as much as that in simulated full immersion zone. Besides the external surrounding factors, the open circuit formed between reducing rust layer and parent steel and the potential difference between internal and external corrosion pit were the main factors of higher corrosion rate.
中图分类号 TG172.5
所属栏目 试验研究
基金项目
收稿日期 2012/7/26
修改稿日期
网络出版日期
作者单位点击查看
备注李琳, 工程师,硕士,
引用该论文: LI Lin,XU Xiao-lian,AI Fang-fang,GAO Peng,CHEN Yi-qing,ZHONG Bin,XIAO Yu. Effect of Technology and Microstructure on Corrosion Behavior of Bridge Steels in Simulated Ocean Splash Zone Environment[J]. Corrosion & Protection, 2013, 34(6): 503
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参考文献
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