Kosmus Patrick, Steiner Oliver, Goessler Walter, Gollas Bernhard
Institute for Chemistry and Technology of Materials, Graz University of Technology, Graz, Austria; CEST Competence Centre for Electrochemical Surface Technology, Wiener Neustadt, Austria.
Electrophoresis. 2014 May;35(9):1334-8. doi: 10.1002/elps.201300454. Epub 2014 Jan 13.
Ionic liquids (ILs) are already used or have great potential in many industrial applications. Knowledge about their unique physicochemical characteristics makes ILs suitable for the electrodeposition of metals with very low negative potentials. Aluminum with its good corrosion protection behavior has great capability to be electroplated from IL electrolytes on steel substrates. The stability of the chosen electrolyte is very important to ensure industrial applicability. In this study, temperature and electrochemical long-term stability from electrolytes based on a Lewis acidic mixture of AlCl3 and 1-ethyl-3-methylimidazolium chloride are investigated. A published method was modified to identify possible degradation products using mass spectrometric detection. The optimized method used an Agilent Zorbax SB-Phenyl column (2.0 × 150 mm, 5 μm particles) with a 20 mmol TFA and 5% ACN mobile phase. This method allowed the quantification of several imidazoles from 0.1 to 100 mg/L. When analyzing the long-term stressed electrolytes, no significant changes in electrolyte composition could be observed.
离子液体（ILs）已在许多工业应用中得到使用或具有巨大潜力。对其独特物理化学特性的了解使离子液体适用于电沉积具有极低负电位的金属。铝具有良好的耐腐蚀性能，极有能力从离子液体电解质中电镀到钢基底上。所选电解质的稳定性对于确保工业适用性非常重要。在本研究中，对基于AlCl₃和1-乙基-3-甲基咪唑鎓氯化物的路易斯酸性混合物的电解质的温度和电化学长期稳定性进行了研究。对一种已发表的方法进行了改进，以使用质谱检测来识别可能的降解产物。优化后的方法使用了安捷伦Zorbax SB-苯基柱（2.0×150 mm，5μm颗粒），流动相为20 mmol TFA和5% ACN。该方法能够对0.1至100 mg/L的几种咪唑进行定量分析。在分析长期受压的电解质时，未观察到电解质组成有显著变化。
