Journal
SURFACE & COATINGS TECHNOLOGY
Volume 203, Issue 10-11, Pages 1373-1378Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.11.003
Keywords
Ionic liquids; Electrodeposition; Lithium-aluminium alloy; Corrosion; XPS
Funding
- European Community [517002]
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In this paper we report on the electrodeposition of thin aluminium layers on P90 lithium-aluminium alloy at room temperature from a chloroaluminate ionic liquid (1-butyl-3-methyl imidazolium heptachloroaluminate [BMIm]Al2Cl7). We found that the treatment of the P90 sample's surface is a key point to obtain good quality coatings. On freshly mechanically polished surfaces, thin (about 24 pm), homogeneous and dense aluminium layers were obtained at 10 mu m h(-1) deposition rate. Finally, the corrosion resistance of the uncoated and Al-coated samples was investigated by means of electrochemical techniques such as open-circuit voltage curves, impedance spectroscopy and potentiodynamic polarization in 3.5 wt.% NaCl aqueous solution. We found that the protective aluminium layer significantly reduces the corrosion rates of the P90 Li-Al alloy. (c) 2008 Elsevier B.V. All rights reserved.
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