Research Progress on the Corrosion Resistance of Aluminum Alloys Treated by Surface Modification in Sulfuric Acid System and Added with Modifier Elements

Abstract

In this paper, the research progress of aluminum - based alloys’ surface modification in sulfuric acid system and modification by adding modifier elements were reviewed. On the one hand, the corrosion resistance of aluminum alloy could be improved by surface modification in different sulfuric acid systems including pure sulfuric acid, sulfuric acid - tartaric acid, sulfuric acid - boric acid, sulfuric acid - oxalic acid, sulfuric acid - organic acid to produce an anodic oxidation film. On the other hand, by adding different modifier elements into aluminum - based alloys, it was found that Mn, Mg, Re elements could enhance the corrosion resistance of the aluminum alloy, while Cu, Si, Sc, Ga and Zr elements had an adverse effect on the corrosion resistance of the aluminum alloy. Besides, it was found that the corrosion laws of aluminum alloy in sulfuric acid solution were mainly pitting corrosion and microcell reaction, which provided a reference for the extensive use of aluminum alloy in hydrometallurgical industry and also for the development of diversified alloys.

Keywords

• al - based alloy|sulfuric acid system|corrosion resistance|surface modification|modifier element