基于阴极电位保护的覆土式储罐化学稳定性与耐腐蚀试验  

Corrosion test and chemical stability of soil-covered storage tank based on cathodic protection

作　　者：李翊 刘杰 刘长沙 邹阳[2] 蒋俊 孙敬庭 LI Yi;LIU Jie;LIU Changsha;ZOU Yang;JIANG Jun;SUN Jingting(CSCEC Installation Group Co.,Ltd.,Nanjing 210023,China;School of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]中建安装集团有限公司,江苏南京210023 [2]福州大学电气工程与自动化学院,福建福州350108

出　　处：《粘接》2023年第5期126-129,共4页Adhesion

基　　金：国家自然科学基金(项目编号:21974020);福建省自然科学基金(项目编号:2019J01248)。

摘　　要：针对覆土式储罐涂层缺陷部位受废水影响出现锈蚀,进而造成储罐寿命短的问题,提出阴极电位法对储罐基体进行保护。探究了阴极保护的规律及保护机理。试验结果表明,废水与缺陷涂层的作用时间越长,对材料的腐蚀越严重,涂层和基体的耐腐蚀性能越差。在基体表面施加外加电压后,材料的耐腐蚀性能得到明显提升。当阴极保护电位为-850 mV时,基体发生腐蚀的难易值(Rf)明显高于其他阴极保护电位,此时金属基体本身的化学稳定性较高,整体表现出较好的耐腐蚀效果。通过-850 mV阴极保护电位的作用,能有效改善的储罐缺陷涂层部位的腐蚀情况,增强储罐寿命。In view of the problem that the coating defect of traditional wastewater storage tank is affected by waste⁃water and rusts,resulting in short service life of the tank,the cathodic potential method was proposed to protect the tank substrate.The law and mechanism of cathodic protection were explored.The test results show that the longer the interaction time between the waste water and the defective coating,the more serious the corrosion of the materi⁃al,and the worse the corrosion resistance of the coating and the substrate.The corrosion resistance of the material is obviously improved after the applied voltage is applied on the surface of the substrate.When the cathodic protec⁃tion potential is-850 mV,the difficulty value(Rf)of corrosion of the matrix is significantly higher than other cathod⁃ic protection potentials.At this time,the chemical stability of the metal matrix itself is higher,and the overall corro⁃sion resistance is better.Through the action of-850 mV cathodic protection potential,the corrosion of the defective coating part of the storage tank can be effectively improved and the service life of the storage tank can be enhanced.

关 键 词：废水储罐 阴极保护 环氧涂层材料 阴极保护电压 储罐防腐 

分 类 号：TQ152[化学工程—电化学工业] TQ323.5