Effect of La Addition on Microstructure and Corrosion Resistance of Mg-La Binary Alloy AITranslate

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Chinese Library Classification Number:TG146.45[金属学及工艺—金属材料]

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Five Mg-xLa alloys with different La contents were prepared by casting method.The effects of La content on the microstructure and corrosion resistance of Mg-xLa alloys were systematically investigated by optical microscope,scanning electron microscope,X-ray diffractometer,microhardness tester and electrochemical workstation.The results show that Mg₁₂La is the only second phase in the Mg-xLa alloys.With the increase of La content,the magnesium alloy grains are gradually refined at first,and the subsequent grain size difference is small.The grain size of Mg-3La alloy is the finest,and its size distribution is also more uniform compared with other alloys.As the content of La increases,the microhardness of the Ma-xLa alloys increases firstly and then decreases slightly,and reaches the maximum value when the La content is 3%.In a 3.5%NaCl solution at 25℃,the corrosion rate of the Mg-La alloy with high La con-tent is significantly lower than that of the Mg-La alloy with low La content.And the corrosion potential of Mg-3La alloy in the 3.5%NaCl solution negatively moves in general with the increase of solution temperature,and its corrosion resistance is the best in the 30℃solution.