Research Progress on Intergranular Corrosion Protection of Aluminum-Copper Alloys

The research status of three treatment methods for improving the corrosion resistance of Al-Cu alloy, including rare earth element doping, surface coating and grain boundary engineering is reviewed, and the future research direction of Al-Cu alloy intergranular corrosion is prospected. Through grain boundary engineering, the proportion of near singular grain boundaries is increased, so as to improve the grain boundary corrosion resistance of Al-Cu alloy, which provides a reference for the effective protection of Al-Cu alloy.