水溶性缓蚀剂对建筑管道用Q235钢腐蚀行为的影响  

Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction

作　　者：何静 于航 傅梓瑛 岳鹏辉 HE Jing;YU Hang;FU Ziying;YUE Penghui(Infrastructure Management Office,Northeastern University,Shenyang 110819,China;School of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学基建管理处,沈阳110819 [2]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [3]东北大学材料科学与工程学院,沈阳110819

出　　处：《中国腐蚀与防护学报》2023年第5期1041-1048,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：兴辽英才计划(XLYC2002071);环境友好材料应用教育部重点实验室项目(吉林师范大学)(2020011)。

摘　　要：采用失重实验、动电位极化曲线、电化学阻抗谱、丝束电极(WBE)测试技术研究了水溶性缓蚀剂对建筑管道Q235钢腐蚀行为的影响。结果表明,水溶性缓蚀剂能够有效地缓解沉积物下Q235钢的腐蚀行为,随着缓蚀剂浓度提高,缓蚀剂成膜完整,基体耐腐蚀性能逐渐增强,在添加25 mg/L水溶性缓蚀剂时缓蚀率最大,Q235钢的自腐蚀电流下降了两个数量级。并且水溶性缓蚀剂还能降低沉积物覆盖区域的电偶电流。因此,定期对建筑管道中加注25 mg/L的水溶性缓蚀剂可以有效抑制Q235钢的腐蚀,即使在沉积物覆盖条件下也起到了很好的效果,能够显著提高建筑管道的质量和延长建筑使用寿命。The effect of water-soluble corrosion inhibitor on the corrosion behavior of pipeline Q235 steel beneath artificial sediments in a liquid of simulated building pipeline sewage was assessed by means of mass-loss measurement,potentiodynamic polarization curve measurement,electrochemical impedance spectroscopy and wire beam electrode(WBE)technique.The results show that the water-soluble corrosion inhibitor IMC-80-N-4 can effectively alleviate the corrosion of Q235 steel in the test environment.With the increasing concentration of the corrosion inhibitor,the inhibitor film formed and became compact gradually on the steel surface.The corrosion inhibition effect of 25 mg/L water-soluble corrosion inhibitor is the best,which reduces the free-corrosion current density of the steel substrate by two orders of magnitude.Moreover,the galvanic current in the area covered with sediments was also reduced.Therefore,regular injection of 25 mg/L water-soluble corrosion inhibitor in the construction pipeline can effectively inhibit the corrosion of Q235 steel,besides,the inhibitor exhibits a good effect even under the condition of sediment coverage.That can significantly improve the safe operation of the construction pipeline,so that increase and extend the service life of the building.

关 键 词：水溶性缓蚀剂 建筑管道 Q235钢 腐蚀行为 

分 类 号：TG172[金属学及工艺—金属表面处理]