The contribution examines the effects of the electrolyte chemical composition on the resulting AAO layer thickness, which is one of the main indicators of corrosion protection of aluminium parts and which also favourably affects mechanical properties of component surfaces. For comparison purposes, there were selected the electrolytes comprising sulphuric acid and sulphuric acid with sodium chloride. Anodizing time for both samples was 210 minutes. The results obtained lead to the assumption that it is possible to replace conventional electrolytes by those that are more environmentally friendly, reduce the costs of their disposal and allow obtaining oxide layers of the same thickness. Detected difference of thickness of formed surface layers was moving in range 1-1,50•10-3 mm, with lowering the amount of used chemical substances and amount of used electrical energy on half of original amounts, at the same time. Here you should describe the paper idea in short.