Influence of Anodizing Current Density on Mechanical and Corrosion Properties of Aluminum

Anodizing was carried out in sulphuric acid bath at various current densities for 45 minutes. Abrasion and Vickers microhardness tests were done. The abrasion weight loss and the Vickers microhardness were measured. Polarization tests were conducted in a 3.5% NaCl solution to assess the corrosion resistance of the coatings. Influence of anodic current density on microhardness, abrasion resistance, corrosion resistance and thickness of the oxide layer, have been investigated. The morphology of anodic oxide layer was examined by scanning electron microscopy (SEM). Results indicated that mechanical and corrosion properties of coatings are affected by using different anodic current densities. Increasing the anodic current density, results in more densed pores and improves the properties of the alloy.