Method for anodizing of aluminum alloy pieces

The invention relates to a method of anodizing a piece of aluminum or aluminum alloy by immersing the part in an aqueous bath essentially comprising sulfuric acid at a concentration between 150 and 250 g / L and at a temperature between 15 and 25 ° C, then applying to the workpiece a DC voltage according to a voltage profile with a voltage rise at a rate between 1 and 32 K / min until reaching a voltage value said plateau between 12 and 20 V, and then maintaining the voltage at the plateau value for a time adequate to obtain the surface of the workpiece an anode layer of a thickness between 3 and 7 microns and / or weight layer between 20 and 150 mg / dm.