Aluminium anodizing is the attainment in a electrolytic process, tightly bound to the metal surface, a porous layer of aluminum oxide. Properties and appearanceof oxide coating depends mainly on primary input (the sort of aluminium), the way of its production and applied preliminary surface treatment. Porosity of the coating enables us to apply various dye-coloring techniques of anodized surfaces of aluminium goods. Anodizing coatings, depending on their thickness and kind of aluminium can protect aluminium even from influence of aggressive atmospheric agents such as acid rain or salt water.