Corrosion behavior of aluminum/steel dissimilar metal welded joints and influential factors: A review

Aluminum/steel dissimilar metal welded joints combine the excellent properties of the two materials and have a wide range of applications in various industries. Due to the great difference in physical, chemical properties and the extremely small solid solubility between aluminum and steel. Aluminum/steel joints are prone to defects such as brittle intermetallic compounds and pores, which seriously affect the mechanical properties of the joints. However, the corrosion resistance of aluminum/steel joints has also received more attention with the increasing applicate and complex applicate environments. This paper systematically summarizes the research work on the corrosion behavior of aluminum/steel dissimilar metal welded joints in recent years, aiming to improve the corrosion resistance of joints based on the corrosion mechanism. This paper summarizes the joint corrosion forms, and discusses the relationship and influence mechanism between corrosion behavior and various factors such as welding process, corrosion environment, microstructure and intermetallic compounds. At the same time, the corrosion mechanism of the joint is pointed out, and the measures to improve the corrosion resistance of the joint are put forward from the aspects of various influencing factors, so as to reduce the influence of corrosion in the actual service process of the aluminum/steel joint as much as possible.