DISSIMILAR METAL JOINING METHOD FOR MAGNESIUM ALLOY AND STEEL

摘要

Provided is a method for joining dissimilar metals wherein an oxide film is present on the joint surface and which can firmly join magnesium alloy with steel for which direct metallurgic joining is difficult. In joining a magnesium alloy material (1) with a steel plate (2), a zinc-plated steel plate (2) to which a Zn-Al-Mg alloy (third material) plating has been applied is used as the steel material. When joining, an Al-Mg-Zn three element eutectic flux is generated and discharged along with the oxide film (1f), impurities, etc. from the joint interface while Al-Mg intermetallic compounds such as Al3Mg2 or Fe-Al intermetallic compounds such as FeAl3 are formed. The newly generated surfaces of the magnesium alloy material (1) and the steel plate (2) are joined to each other via a compound layer (3) that comprises the intermetallic compounds.