Effect of environment-friendly solution on antirust behavior of metals

In view of the importance of environment-friendly inter-process antirust solution for various metals in engineering, a solution with the pH value about 7-8 that consists of phytic acid, compound inhibitor and so on was prepared. Atmospheric exposure, lamination and corrosion tests results show that steel, copper alloy and aluminum alloy treated with this solution exhibit excellent antirust property, which is mainly attributed to the synergistic effect of different corrosion inhibitors in the solution. Phytic acid and compound inhibitor play a synergistic role in the formation of the compact and uniform adsorption-complextion film on steel surface. And the self-corrosion potential of steel shifts from -0.74 V to -0.08 V and the corrosion current is reduced evidently. In addition, the self-corrosion potentials of copper and aluminum alloys also increase obviously as the antirust treatment duration increases, which results in the improvement in antirust property.