Galvanic Corrosion and Protection of Joints between Steel and Aluminum alloy in Automobiles

Multi-material hybrid body design for vehicle lightweight will inevitably lead to galvanic corrosion caused by the joint of dissimilar materials. The corrosion resistance of steels and aluminum alloys commonly used in automobiles and their galvanic corrosion after joining are reviewed. In view of the fact that the current connection between steel and aluminum alloy in automobile is mechanical connection, combined with the actual automotive materials and the complexity of the corrosion of dissimilar joints, the research status and shortcomings of galvanic corrosion of steel and aluminum alloy mechanical connections are emphatically expounded. In addition, the effective measures to inhibit the steel-aluminum galvanic corrosion of the car body are introduced from the aspects of design and manufacture, anti-corrosion technology and connection technology.