According to the density of sulfuric acid is used as the electrolyte bath temperature and the voltage applied to vary. Current density increases to 100 1 (u) m in oxide thickness can be obtained. Ideal for exterior surfaces, anodized thickness of 20-25 (U), the inner surfaces of the 10-25 (U) is around. ASM, 25 (U) to a thickness of anodised aluminum production.