MoO4和NO对碳钢小孔腐蚀的协同抑制作用-腐蚀科学与防护技术.PDF

第27 卷 第4 期 腐蚀科学与防护技术腐蚀科学与防护技术 Vol.27 No.4 2015 年7 月 CORROSION SCIENCE AND PROTECTION TECHNOLOGY Jul. 2015 MoO42-和NO2-对碳钢小孔腐蚀的协同抑制作用 周 勇 左 禹 北京化工大学 材料电化学过程与技术北京市重点实验室 北京 100029 摘要：采用极化曲线、电化学阻抗谱(EIS)、莫特- 肖脱基曲线和X 射线光电子能谱(XPS) 研究了MoO42-和NO2- 对碳钢小孔腐蚀的协同抑制作用。结果表明，MoO 2-和NO -联合应用使碳钢的亚稳态孔蚀电位(E ) 和孔蚀击 4 2 m 穿电位(E ) 发生明显正移，并且显著提高了两者的差值，对抑制亚稳态小孔形核以及亚稳态小孔向稳态小孔 b 转变的效果明显；MoO 2-和NO -联合应用可以在碳钢表面形成一层Fe O +Fe (MoO ) 复合钝化膜，这层复合钝 4 2 2 3 2 4 3 化膜的阻抗较大、缺陷较少，对碳钢的保护作用明显加强。 关键词：碳钢 小孔腐蚀 钝化膜 MoO42- NO2- 中图分类号：TG 172 文献标识码：A 文章编号：1002-6495(2015)04-0321-06 Synergistic Inhibition of MoO42- and NO2- on Pitting Corrosion of Mild Steel ZHOU Yong, ZUO Yu Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China Abstract: The synergistic inhibition effect of MoO42- and NO2- on pitting corrosion of mild steel was studied by polarization curve, electrochemical impedance spectroscopy (EIS), Mott-Schottky plot, and X-ray photoelectron spectroscopy (XPS). The results showed that the metastable pitting potential (E ) and the pitting breakdown potential (E ) of the mild steel shift significantly to much m b positive and the value of (E -E ) increased markedly when MoO 2- and NO - were applied at the b