Corrosion Damage and Surface Treatments of Materials in Ionic Liquid Electrolytes

• Main Authors: Jheng-Yi Lin, 林正一
• Other Authors: Jeng-Kuei Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/29044379800901211921

碩士 === 國立中央大學 === 材料科學與工程研究所 === 100 === In part one of this study, the corrosion behaviors of seven materials(titanium, 304 stainless steel, carbon steel, copper, nickel, aluminum, magnesium ) in three different ionic liquids including 1- ethyl-3-methylimidazolium chloride aluminum chloride(EMIC-AlCl3), 1- ethyl-3-methylimidazolium chloride dicyanamide (EMI-DCA), and N-methyl-N-alkylpyrrolidinium dicyanamide (BMP-DCA) have been investigated to know the effect of different cation and anion. The results indicate that the corrosion behaviors of these materials are similar in ionic liquids (EMI-DCA, BMP-DCA) with the same anion. Furthermore, most of materials have higher corrosion current in EMIC-AlCl3 than in EMI-DCA or BMP-DCA. This investigation uses ionic liquid with many kind metallic ions to make replacement with magnesium. Replacing metal on Mg surface helps improving corrosion resistance. The results show copper, nickel, zinc could be reduced on magnesium surface by replacement reaction. In X-ray Absorption Spectroscopy, the energy peaks shifted toward lower photo energy during replacement processes by transformation from metal ions to pure metal. After cleaning the sample surface, the analytical results of the sample surface are similar with the results of pure metals. Potentiodynamic polarization results indicate that the corrosion resistance of Mg samples has been improved after replacing treatment. The results show extraordinary passivation when replace copper and nickel on magnesium surface.