| abstract |
Structural components made of aluminum and aluminum alloys are anodized in two sequential steps in two different electrolytes. The first electrolyte is a mixed acid of two inorganic acids such as a phosphoric-sulfuric acid mixture. The second electrolyte is a further acid mixture of an organic acid and an inorganic acid to form a tartaric sulfuric acid mixture. The two sequential anodizing steps result in a surface texture that has three excellent surface characteristics simultaneously, namely: a corrosion resistance, a coating acceptance for lacquer coatings and an adhesive bonding with other aluminum material components. |