Abstract: A method of treating a part made of an aluminum alloy containing copper at a content in the range 0.1% to 10% by weight includes providing the part; and performing electrochemical pretreatment of the part in a first electrolyte bath containing sulfuric acid and a first oxidizer compound, a first potential difference being established between a first cathode and a first anode dipped in the first bath, the part being the first anode, the concentration of the first oxidizer compound being such that the corrosion potential of the aluminum alloy is greater than +100 mV relative to a hydrogen normal electrode. After the pretreatment, the method includes anodizing the part in a second electrolyte bath containing sulfuric acid and a second oxidizer compound, a second potential difference ?V2 being established between a second cathode and a second anode dipped in the second bath, the part being the second anode.