Corrosion of iron in anhydrous methanol
Corrosion of iron in anhydrous methanol
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DOI：
10.1016/0010-938x(93)90111-s
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发表时间：
1993-03
影响因子：
8.3
通讯作者：
M. Sakakibara;N. Saito;H. Nishihara;K. Aramaki
中科院分区：
文献类型：
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作者：
M. Sakakibara;N. Saito;H. Nishihara;K. Aramaki
在氮气氛下，在无水甲醇加0.1M电解质溶液（水含量<450ppm）中测量通过暴露于空气时的磨损和清洁制备的铁电极的循环伏安图和阳极极化曲线。这些测量和表面分析的结果，通过X射线光电子能谱表明，在制备过程中的表面上形成的氧化膜保护铁免受甲醇溶液中的腐蚀。腐蚀性阴离子会破坏薄膜。氧化物覆盖的铁电极在含有阴离子的甲醇中的点蚀电位按I−> Br−> Cl−的顺序降低。在无氧和干燥氩气气氛下制备的铁电极的腐蚀速率通过阻抗测量在0.1M LiClO4（水含量<150ppm）的无水甲醇溶液中测量。电极表面的X射线光电子能谱表明形成了微溶于甲醇的甲醇亚铁。随着时间的增加，甲醇盐在表面上的积累，腐蚀速率降低。
Cyclic voltammograms and anodic polarization curves of an iron electrode prepared by abrasion and cleaning upon exposure to air were measured in anhydrous methanol plus 0.1 M electrolyte solutions (water content < 450 ppm) under a nitrogen atmosphere. Results of these measurements and surface analyses by X-ray photo-electron spectroscopy showed that an oxide film formed on the surface during the preparation protects iron against corrosion in methanol solutions. Breakdown of the film occurs with aggressive anions. The pitting potentials of the oxide-covered iron electrode in methanol with the anions decreased in the order, I−> Br−> Cl−. The corrosion rate of an iron electrode prepared under an oxygen-free and dry argon atmosphere was measured in an anhydrous methanol solution of 0.1 M LiClO4(water content < 150 ppm) by impedance measurements. X-Ray photo-electron spectra of the electrode surface suggested the formation of ferrous methoxide which is sparingly soluble in methanol. The corrosion rate decreased with an increase in time by accumulation of the methoxide on the surface.