| The paper has taken the modification treatment and corresponding properties research on ZM5 magnesium alloy through the solid diffusion test of zinc & aluminum powder. The purpose is to improve the surface corrosion and wear properties of magnesium alloy so that it could be use in more industrial fields. On the basis of solid diffusion process condition of magnesium alloy, the author mainly studied the optimum process parameters to form the solid diffusion layer, the microstructure of the solid diffusion layer and its corresponding corrosion and wear properties. The inherence relationship and rules of the process condition, microstructure and properties are also studied.The results shown that: (1) Through the solid diffusion treatment of zinc & aluminum powders on ZM5 magnesium alloy, the solid diffusion layer has formed in the surface zone and that are composed of Mg-Al-Zn intermetallic compounds subzone (A15MgllZn4, A16Mg10Zn) and solid solution subzone; (2) With the change of process condition, the microstructure morphology and the thickness of the diffusion layer are different. Under specialty process condition, the optimum diffusion layer would formed; (3) The results of 96 hour continual salt water immersion test and the electrochemical test indicates that the corrosion property of the treated specimen is obviously improved compared with the standard untreated specimen or the anodic specimen and the continual distributed Mg-Al-Zn intermetallic compounds is the main factor for the improvement of corrosion properties; (4) From the microhardness and wear test, we could see that thesolid diffusion layer not only pose higher hardness value three times of the standard specimen and good bond strength, but also make the treated specimen more wearabie(two times) than the untreated specimen or the anodic specimen; (5) The experimental condition of forming the optimal diffusion layer was (430 C,12h) for ZnAl50 powder and (410 C,8h) for ZnA127 powder.
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