Investigation on the effect of anodizing on increasing the resistance to corrosion in marine and aircraft aluminum alloys

Abstract

By attention to the increased application of Aluminum alloy in various industries, essentiality of excreting suitable surface preparation in order to increase the resistance to the corrosion is inevitable. Meanwhile using special materials in various groups of alloys (alloy groups of 7000, 2000) their problem of the corrosion is higher. Different kinds of coatings are used. In marine environment and other places with higher humidity exerting the anodizing coats, Is the best method to prevent the exfoliation corrosion of aluminum alloy. In this research the effect of different currents (1.6 and 2.6 ) and the importance of sealing on increasing the corrosion resistance to anodizing alloys 7075-T6, 2024-T3, 6061-T6 and 5083-H34 by using the salt spray in accordance with the ASTM B117 standard is investigated and the results reveals the importance of the current density and the process of sealing on increasing the resistance to corrosion of the anodized coating.