Improvement of Corrosion Resistance of Aluminum by Application of Alumina- Zirconia Nanocomposite Coating via Sol-Gel Method

Aluminum and its alloys, after iron, took the second place in most industries, but they are not stable when they are subjected to corrosion and erosion. One of the conventional methods for protection of metals against corrosion and soft erosion is usage of ceramic coating. In this research, sol gel method has been used in preparation of a ceramic coating with different weight ratios of Alumina to Zirconia. Synthesized coatings after applied on aluminum samples have been heat treated at different temperatures. Prepared coatings have been studied by scanning electron microscopy. The results of corrosion tests show that samples with more contents of zirconia and lower heat treatment reveal higher corrosion resistance.