Salt Aluminized On AZ31 Magnesium Alloy Welded Joints On The Corrosion Resistance Of

Magnesium has been paid more and more attention，because of low density,high specific strength, high specific rigidity, low elastic modulus, excellentdamping performance and good machining performance.Therefore, theapplication of magnesium and magnesium alloys in social life is alsoincreasingly widespread, such as applications in automotive, aerospace,weapons manufacturing and communications, etc.. However, due to softeningof magnesium and magnesium alloy welded joints more serious and poorcorrosion resistance, but also severely constrained in some areas of its broaderapplications. Therefore, improving the performance of magnesium andmagnesium alloy welding and improve its corrosion resistance performance hasbecome an important issue to develop applications of magnesium andmagnesium alloys.Through the study of this subject AZ31magnesium alloy TIG weldingprocess and aluminized salt bath technology to explore the possibility throughthermal diffusion technology to improve its corrosion resistance of welded joints,and focuses on the time, temperature and other process parameters on theinfiltration aluminum layer microstructure, micro hardness and corrosion effects.The experimental results showed that: infiltration through the surface hardnessof the aluminum salt bath experiments AZ31magnesium alloy welded joints andcorrosion resistance has significantly improved. When one of aluminizedexperiment without salt bath, the surface hardness of ZA31magnesium alloywelded joints around53.45HV. And after450oC-2h Salt aluminizedexperimental micro-hardness of AZ31magnesium alloy welded joints can be up85.46HV; which time the experiment without salt bath aluminized, ZA31magnesium alloy welded joints NaCl solution by static immersion corrosion rateof about was25.45%, while after Salt aluminized experiment, the corrosionrate of AZ31magnesium alloy welded joints of about5.04%; mainly due toexperiments by Salt aluminized surface of AZ31magnesium alloy welded joints to form a layer of magnesium aluminate Mg17Al12etc. dense phase aluminizingprimary component.