试验研究 2025年 第卷 第11期

DOI: 10. 7672 / sgjs2025110134

氯盐作用下缺陷涂层钢筋腐蚀试验及修复技术

张东方¹’²,陈志强³,刘国强¹’²,陈昊翔¹’²,吴清发⁴’⁵

作者简介：

张东方, 博士, 高级工程师, E⁃mail: dfzhang _ xmu @163. com

作者单位：

1. 水工构造物耐久性技术交通运输行业重点实验室,广东 广州 510230; 2. 中交四航工程研究院有限公司,广东 广州 510230; 3. 中交第四航务工程勘察设计院有限公司,广东 广州 510000; 4. 港珠澳大桥管理局,广东 珠海 519060; 5. 广东港珠澳大桥材料腐蚀与工程安全国家野外科学观测研究站, 广东 珠海 519060

基金项目：

∗国家重点研发计划(2019YFB1600700)

摘要：

环氧涂层钢筋可提高海洋工程混凝土结构的耐久性,但在工程应用中,环氧涂层易产生缺陷,从而降低涂层钢筋的耐腐蚀性能. 以华南海洋实况环境测试 4 种不同缺陷破损率对涂层钢筋混凝土耐久性的影响. 研究结果表明,涂层缺陷是引发钢筋锈蚀的主要因素,在氯盐作用下,随着涂层破损率增加,钢筋腐蚀电流密度显著上升.因此,研发混凝土用牺牲阳极⁃活性砂浆复合阴极保护技术,暴露试验及工程应用结果显示,施加牺牲阳极⁃活性砂浆复合阴极保护技术能够显著提升缺陷涂层钢筋的抗氯盐侵蚀性能,极化电位≥200mV,保护电位<-800mV.
混凝土;环氧涂层;钢筋;缺陷;腐蚀;试验

English：

Epoxy⁃coated steel bars can improve the durability of marine engineering concrete structures,but in engineering applications, epoxy coatings are prone to defects, thereby reducing the corrosionresistance of coated steel bars. The effects of four different defect damage rates on the durability of coatedreinforced concrete were tested in the real marine environment of South China. The results indicate thatthe coating defect is the main factor causing the corrosion of steel bars. Under the action of chloride salt,the corrosion current density of steel bars increases significantly with the increase in coating damage rate.Therefore, the sacrificial anode⁃conductive mortar composite cathodic protection technology for concrete isdeveloped. And the results of the exposure test and engineering application indicate that the applicationof sacrificial anode⁃active mortar composite cathodic protection technology can significantly improve thechloride corrosion resistance of defective coated steel bars. The polarization potential is greater than orequal to 200mV, and the protection potential is less than -800mV.