1-Butyl-3-Methylimidazolium Chloride as Corrosion Inhibitor for 6063 Aluminium Alloy in Acid Solution
Aluminum alloys have found a wide range of applications in industry, sometimes presenting a better alternative and serving as a replacement for steel. This is due not only to relatively low cost of the aluminum alloys, but it is also related to their mechanical properties, combined with their high corrosion resistance in several corrosion environments. Different types of organic, inorganic and natural products have been extensively reported as corrosion inhibitors for aluminum alloys in acid, basic and/or chloride-containing solutions. Ionic liquids are among the organic compounds used as corrosion inhibitors in these cases. In this work we report on the corrosion inhibition efficiency of the ionic liquid 1-butyl-3-methylimidazolium chloride in the corrosion of AA6063 aluminum alloy in 0.5 M HCl solution at different temperatures, using the weight loss and the potentiodynamic polarization techniques. The corrosion inhibition efficiency increased with increasing the concentration of the inhibitor, but decreased with increasing the temperature. The highest corrosion inhibition efficiency (69%) was obtained for 0.7 vol.% of the inhibitor added. The potentiodynamic polarization curves show that 1-butyl-3-methylimidazolium chloride is a mixed-type inhibitor with a more pronounced effect on the anodic corrosion reaction.
Keywords - Corrosion, 6063 Aluminum Alloy, Weight Loss Method, Potentiodynamic Polarization Method, Acid Solution, Ionic Liquid