腐蚀
钼酸钠
水溶液
钼酸盐
合金
电化学
镁合金
镁
无机化学
氯化物
材料科学
X射线光电子能谱
缓蚀剂
钠
化学
冶金
化学工程
有机化学
电极
物理化学
工程类
作者
D. S. Kharitonov,Małgorzata Zimowska,Jacek Ryl,A. Zieliński,M. A. Osipenko,Janusz Adamiec,Angelika Wrzesińska,Per M. Claesson,И. И. Курило
标识
DOI:10.1016/j.corsci.2021.109664
摘要
Corrosion and corrosion inhibition of WE43 magnesium alloy were investigated in NaCl solutions containing different amounts of sodium molybdate. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. Electrochemical data showed that Na2MoO4 inhibitor provides reliable inhibition at concentrations at and above 100 mM. Raman and XPS spectroscopy demonstrated that the formed surface layer consists of mixed Mo(V, IV) species. This layer provided inhibition with an efficiency of 91–99 % after 24 h of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition of the WE43 alloy by aqueous molybdates was proposed.
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