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1.4 CHEMICAL SCIENCES
Conventional anodising electrolytes based on sulphuric acid, oxalic acid and phosphoric acid have been used to form nanoporous layers on AA3003-H14 and sealed with silane based sol-gel sealers. It is shown that the sol-gel chemistries have varying levels of pore penetration depending on the synthesis conditions. The extent of sol-gel penetration and pore sealing is analysed by electron microscopy and energy dispersive x-ray spectroscopy. To describe the sealing phenomena observed a sol-gel penetration and sealing rating has been proposed to explain the interactions of the sol-gels with the pores of the anodised layers. The corrosion resistance of the sol-gel sealed anodised aluminium surfaces was evaluated using neutral salt spray testing and electrochemical impedance spectroscopy.
Whelan, M., Cassidy, J., Duffy, B.: (2013) Solar gel sealing characteristics for corrosion resistance of anodised aluminium. Surface and Coatings Technology, Volume 235, 25 November 2013, pp. 86-96, ISSN 0257-8972, doi:10.1016/j.surfcoat.2013.07.018 Available from the publisher here