Abstract: The amino trimethylene phosphonic acid (ATMP) was added to the passivation zirconium-titanium aqueous solution to form the passivation films on AA6061 aluminum alloy through dipping treatment for anti-corrosion. The influence of ATMP on the corrosion resistance of the passivation films in 3.5%NaCl solution was studied by electrochemical methods, and the film-forming mechanism and anti-corrosion mechanism were discussed. The electrochemical results show that the corrosion potential especially the corrosion current of the passivation films decreases obviously after adding the ATMP. It reveals that adding ATMP into the zirconium-titanium solution can further alleviate the cathodic reaction of aluminum alloy, thus suppressing the corrosion behavior of aluminum alloy efficiently.