Nickel-free sealing technology for anodic oxidation film of aluminum alloy at room temperature

Abstract

Different additives were added into the potassium fluorozirconate solution to prepare different nickel-free sealing reagents, with which the anodic oxidation film of aluminum alloy was sealed at room temperature. The phosphor chromic acid weight loss method was used to evaluate the sealing effects. Using electron scanning microscopy (SEM), the surface and cross-sectional micro-morphologies of the anodic oxidation films sealed by different fluorozirconate sealants were observed. The position and state of zirconium element distribution in the film hole were investigated by the further quantitative and distribution analysis of Zr element. This study provides an experimental evidence for the theoretical studies of fluorozirconate-sealed anodic oxidation films. It is shown that the fluorozirconate has good sealing effects and has a wide prospect for sealing the aluminum alloy samples. Its products were highly corrosion resistant, and were filled in the openings of the micropores in the oxide film.