合金钢在氯盐与硫酸盐作用下的腐蚀行为与机理  

Corrosion Behavior and Mechanism of Alloy Steel Submitted to Chloride and Sulfate

作　　者：袁均相 刘国建 刘志勇[2] 佘伟[2] 张云升[2,3] YUAN Junxiang;LIU Guojian;LIU Zhiyong;SHE Wei;ZHANG Yunsheng(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,Jiangsu,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]东南大学材料科学与工程学院,南京211189 [3]兰州理工大学土木工程学院,兰州730050

出　　处：《材料导报》2025年第8期159-165,共7页Materials Reports

基　　金：国家自然科学基金(52008284)。

摘　　要：通过腐蚀电位、线性极化电阻、腐蚀电流密度和电化学阻抗谱分析,研究了氯盐与硫酸盐作用下预钝化合金钢在饱和Ca(OH)_(2)混凝土模拟孔溶液中的腐蚀演变,利用Fe-Cr-H_(2)O合金系统Pourbaix图分析,探讨了两种离子在腐蚀过程中的作用机理。研究结果表明:氯离子单独存在的情况下,合金钢腐蚀速率最高,硫酸根离子单独存在时腐蚀速率最低;而氯离子和硫酸根离子共存情况下,电化学测试结果均介于两者单独存在的结果之间。根据理论分析,提出了合金钢腐蚀过程中氯盐和硫酸盐竞争吸附-催化腐蚀两阶段反应机理模型。The corrosion behavior of pre-passivated alloy steel in a saturated Ca(OH)_(2) simulated concrete pore solution was analyzed under the action of chlorides and sulfates through corrosion potential,linear polarization resistance,corrosion current density,and electrochemical impedance spectroscopy.By leveraging the Pourbaix diagram of the Fe-Cr-H_(2)O alloy system,the action mechanisms of two ions in the corrosion process was investigated.Results showed that the corrosion rate of steel was the highest with chlorides only,and the lowest with sulfates only,and intermediate with both ions.Finally,based on theoretical analysis,a reaction mechanism model of the competitive adsorption and catalysis of corrosion by chlorides and sulfates in lalloy steel corrosion was proposed.

关 键 词：合金钢 腐蚀 复合侵蚀离子 氯盐 硫酸盐 

分 类 号：TU528[建筑科学—建筑技术科学]