Influence of Metal Cations on Corrosion Behavior of Aluminum Alloy 2024-T3 in Model Freshwater

The influence of metal cations on corrosion behavior of aluminum alloy (AA2024-T3) in model freshwater was examined by immersion experiments, surface analysis, and electrochemical measurements. After long-time immersion, the corrosion rate of AA2024-T3 decreased as the corrosion indicator Y increased, and the corrosion rate of the alloy was reduced by Zn2+. The specimen immersed in Zn2+ containing solution showed less corrosion products which were observed by scanning electron microscopy (SEM). The results of X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) showed that Zn2+ attaches to aluminum alloys and forms protective layers. Electrochemical impedance spectroscopy (EIS) results suggested that Zn2+ reduced the area of defects in the passive film.

Automated summary

The influence of metal cations on the corrosion behavior of AA2024-T3 aluminum alloy in model freshwater was investigated. Immersion experiments, surface analysis, and electrochemical measurements were conducted. The corrosion rate of AA2024-T3 decreased as the corrosion indicator Y increased after long-term immersion, and the presence of Zn2+ reduced the corrosion rate of the alloy. Scanning electron microscopy (SEM) observations revealed fewer corrosion products for the specimens immersed in Zn2+-containing solution. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) showed the attachment of Zn2+ to aluminum alloys, forming protective layers. Furthermore, electrochemical impedance spectroscopy (EIS) results indicated that Zn2+ reduced the area of defects in the passive film.