曼尼希碱及其与硅酸钠复配缓蚀剂缓蚀性能评价  

Corrosion inhibition of Mannich base for steel 316L in crude aqueous solution

作　　者：任晓光[1,2] 周继敏[1,2] 宋永吉[1,2] 刘丹[1] 

机构地区：[1]北京石油化工学院化工系,北京102617 [2]北京化工大学化学工程学院,北京100029

出　　处：《油气地质与采收率》2010年第6期104-106,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金"高硬度电解质水溶液垢下腐蚀机理及规律研究"(20676017);北京市属;市管人才强教计划资助项目"清洁燃料技术开发创新团队"(Bjjwr20051102);北京市教委URT资助项目"教育教学--本科生科学研究计划"(2008J00153)

摘　　要：利用缓蚀剂快速评定仪和电化学工作站,考察了曼尼希碱及其与硅酸钠复配缓蚀剂的缓蚀效果。结果表明:曼尼希碱中的氧原子、氮原子分别与铁离子作用后,形成了一层钝化膜吸附在金属表面,从而起到缓蚀的作用。当曼尼希碱在腐蚀溶液中的质量分数为0.5%时,其缓蚀效果最佳。而其与硅酸钠复配后的缓蚀剂,是由曼尼希碱和S iO32-在金属表面形成膜,内层的阴离子选择性氧化膜阻止Fe2+和Fe3+通过膜向溶液迁移而起到缓蚀作用,质量分数为0.05%的曼尼希碱与质量浓度为0.02g/L的硅酸钠复配后的缓蚀剂效果最佳,其在腐蚀溶液中的缓蚀率为83.99%。应用极化曲线法对曼尼希碱及复配缓蚀剂的评价结果表明,复配缓蚀剂的缓蚀率明显高于曼尼希碱,这对工业防腐和选材具有一定的指导作用。Inhibiting performance of Mannich base corrosion inhibitor and compounded corrosion inhibitor for steel 316L in crude aqueous solu-tion is studied herein by rapid assessment instrument (CMB-4510A) and electrochemical workstation(IM6ex).Results show that ox-ygen atom and nitrogen atoms of Mannich base can form protection film with iron ion.The film is adsorbed al metallic surface,and the best inhibition efficiency is obtained at a mass percentage of 0.5%.There existed good synergistic effect between corrosion in-hibitor of Mnnich base and sodium silicate.Owing to the film formed by Mannich base and SiO32-,the anion-selective inner film may prevent Fe2+ and Fe3+ from migrating through the film to the solution.When the 0.05% Mannich base and 0.02g/L sodium sili-cate are compounded,corrosion rate reaches nearly 84% in the solution.Polarization curve method is used to validate corrosion effect of the complex corrosion inhibitor,and the complex corrosion inhibitor has clear superiority over Mannich base when it is used alone.It is of certain reference and significance for the anti-corrosion and industrial material selection.

关 键 词：曼尼希碱 缓蚀性能 硅酸钠 协同效应 极化曲线 复配缓蚀剂 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]