金属铝用复配缓蚀剂协同缓蚀作用研究  

Synergistic Corrosion Inhibition Effect of a Compound Inhibitor for Aluminum

作　　者：柳泽邦 冉博元 裴恒 罗凯林 赵智斌 韩鹏 强玉杰 LIU Zebang;RAN Boyuan;PEI Heng;LUO Kailin;ZHAO Zhibin;HAN Peng;QIANG Yujie(School of Chemical&Environmental Engineering,China University of Mining&Technology,Beijing 100083,China;National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China;Talented Doctoral Workstation of Jixian,Linfen 042200,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]北京科技大学国家材料服役安全科学中心,北京100083 [3]吉县英才博士工作站,临汾042200

出　　处：《中国腐蚀与防护学报》2024年第2期312-322,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：中央高校基本科研业务费专项资金(2023JCCXJD01);教育部产学合作协同育人项目(220706429013009);中国矿业大学(北京)大学生创新训练项目(202304050)。

摘　　要：采用理论模拟与实验分析方法,将4-巯基吡啶(4MP)、十二烷基硫酸钠(SDS)和4MP-SDS复配缓蚀剂作为金属铝缓蚀剂,对其在3.5%(质量分数)NaCl溶液中的缓蚀行为进行了研究。结果表明,加注缓蚀剂可有效降低自腐蚀电流密度,缓蚀剂加注浓度提高对改善缓蚀剂脱附电位具有促进作用,缓蚀效率顺序为4MP+SDS>SDS>4MP,失重测试结果与电化学测试结果表现出较好的一致性。复配缓蚀剂加注后,可在金属表面吸附形成缓蚀剂膜层,增大腐蚀性离子扩散和迁移的阻力,样品腐蚀速率减慢,表面维持较好的金属光泽,表现出均匀腐蚀形态特征。The corrosion inhibition behavior of 4-mercaptopyridine(4MP),sodium dodecyl sulfate(SDS),and compound inhibitor 4MP-SDS for aluminum in 3.5%NaCl solution was comparatively investigated via experimental test and digital simulation.The results show that the presence of corrosion inhibi-tor could effectively reduce the free-corrosion current density.Moreover,the increase dosage of corrosion inhibitor has a positive effect on the enhancing desorption potential of corrosion inhibitor.The corrosion inhibition efficiency of the three inhibitors may be ranked as 4MP+SDS>SDS>4MP.The mass loss test results show good agreement with the electrochemical test results.After the injection of compound inhibitor,a corrosion inhibitor film can form on the metal surface.Thus,the resistance to the diffusion and migration of corrosive ions increased and the corrosion rate of Al slowed down,correspondingly,the Al surface maintains a good metallic luster and shows the characteristics of a uniform corrosion pattern.In addition,the anti-corrosion mechanism of the compound inhibitor 4MP+SDS was revealed by molecular dynamics(MD)simulation.The compound inhibitor 4MP+SDS showed greater ability to slow down the build-up of interfacial water layers,increase the surface coverage,and the bonding effect is more stable,compared with the presence of a single 4MP or SDS,demonstrating the strong adsorption of the compound inhibitor on Al,while the best anti-corrosion performance.

关 键 词：铝 腐蚀 缓蚀剂 协同效应 理论模拟 

分 类 号：TG174[金属学及工艺—金属表面处理]