钼酸盐复合缓蚀剂在天然海水中的缓蚀机理  

Corrosion Inhibition Mechanism of Molybdate Complex Inhibitor in Sea Water

作　　者：柳鑫华[1] 韩婕[1] 孙彩云[1] 芮玉兰[1] 王庆辉[1] 

机构地区：[1]河北联合大学轻工学院,唐山063000

出　　处：《腐蚀与防护》2012年第4期296-299,共4页Corrosion & Protection

基　　金：河北省科技局科技攻关项目(06213027);唐山市重点实验室项目

摘　　要：采用电化学阻抗与能谱图研究了钼酸盐复合缓蚀剂在天然海水中的缓蚀机理。阻抗谱表明,该缓蚀剂通过增大金属表面的电荷转移电阻而降低电化学腐蚀速率;X射线光电子能谱(XPS)显示钼酸盐复合缓蚀剂在海水中的碳钢表面主要形成了Fe3O4、Fe2O3,以及三价铁与钼酸根和缓蚀剂中有机成分形成的有机铁络合物。能量谱(EDS)测试结果表明,添加了钼酸盐复合缓蚀剂的碳钢表面膜中钙元素含量很低(0.08%),表明缓蚀剂中具有阻垢性能的有机瞵酸盐(HEDP)和葡萄糖酸盐对海水中的Ca2+起络合分散作用,阻止了钙盐在金属表面的沉积,这也表明该缓蚀剂具有缓蚀性能的同时又具有良好的阻垢性能。The corrosion inhibition mechanism of molybdate complex inhibition was studied in sea water by EIS and energy spectra. The results of electrochemical EIS testing showed that the corrosion rate decreased because the complex inhibitor increasing the charge transfer resistance of metal surface. The results of XPS showed that a compact protective passive film was formed on the surface of carbon steel in seawater. The main components of the film are FeaO4and Fe2Oa and a little Fe3＋, MoO42- and organic substance. X-ray dispersive spectroscopy （EDS） testing showed that the calcium content in the film on carbon steel surface was very low when addintion of the compound inhibitor was only 0. 08%, indicating that the complexation and dispersion of organic phosphate （HEDP） and sodium gluconate on Ca2＋ in seawater impeded the deposition of calcium on metal surface. It also showed that the complex corrosion inhibitor had ~：ood scale inhibition nerforrnance

关 键 词：钼酸盐 电化学阻抗谱 XPS EDS 海水 

分 类 号：TG174.42[金属学及工艺—金属表面处理]