两种无机盐在氯盐侵蚀混凝土模拟孔溶液中阻锈效果探索  

Corrosion inhibition effect of two inorganic salts in simulated concrete pore solution under chloride condition

作　　者：金林森 孙文昊[1,2] 管鸿浩 刘光严[3] 王涛 周莹 JIN Linsen;SUN Wenhao;GUAN Honghao;LIU Guangyan;WANG Tao;ZHOU Ying(China Metro Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;National-Local Joint Engineering ResearchCenter of Underwater Tunnelling Technology,Wuhan 430063,China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]水下隧道技术国家地方联合工程研究中心,湖北武汉430063 [3]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,江苏南京210008

出　　处：《混凝土》2025年第2期90-95,共6页Concrete

基　　金：钻爆法海底隧道喷锚支护耐久性技术研究(2021K036-W01);国家自然科学基金(U1934206);国家重点研发计划(2021YFB2600800)。

摘　　要：研究了磷酸二氢钠,焦硫酸钠两种无机盐在3.5%氯盐浓度条件下对钢筋腐蚀电化学行为的影响。结果表明:当磷酸二氢钠达到一定浓度时可以维持钢筋钝化状态,在初始氯盐浓度为3.5%时,对应维持钢筋钝化状态需要的磷酸二氢钠浓度为3.5%。焦硫酸钠的掺入虽不能维持钢筋的钝化状态,但是可以有效降低腐蚀速率,在初始氯盐浓度为3.5%时,焦硫酸钠浓度为4%时钢筋腐蚀速率降低程度最为显著。表面分析表明:磷酸二氢钠通过与钢筋表面形成FePO_(4)阻止钢筋腐蚀的发生,焦硫酸钠通过抑制氧腐蚀阴极反应延缓钢筋腐蚀。The effect of sodium dihydrogen phosphate,sodium pyrosulfate on carbon steel(3.5%chloride level)was studied.The results show that when sodium dihydrogen phosphate reaches a certain concentration and above the steel bar passive state can be mantained,when the initial chloride concentration is 3.5%,the corresponding sodium dihydrogen phosphate level is 3.5%.Although the passivation state of steel bars cannot be maintained in simulated pore solution with sodium pyrosulfate,the corrosion rate can still be effectively reduced.When the initial chloride concentration is 3.5%,the maximum reduction happens when is sodium pyrosulfate 4%.Surface analysis shows that sodium metabisulphate retards corrosion by inhibiting the oxygen corrosion cathodic reaction,while sodium dihydrogen phosphate prevents corrosion from occurring by forming FePO_(4)with the steel surface.

关 键 词：阻锈剂 氯离子 钢筋腐蚀 线性极化 电化学阻抗谱 

分 类 号：TU528.042.6[建筑科学—建筑技术科学]