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采用熔融浇注法自行制备了Mg-1.5Zn-xMn(x=0.5、1.0、2.0)合金,利用光学显微镜、浸泡腐蚀试验及电化学测试等方法,研究了其微观组织及在Hank’s模拟体液中的腐蚀行为。结果表明:Mg-1.5Zn-xMn合金的铸态显微组织是由Mg-Zn相、α-Mn相和粒状α-Mg析出相组成;随着锰含量的增大,α-Mn相逐渐增多,合金的腐蚀面积及速率逐渐增大;随着锰含量的减少,合金容抗弧半径越大,自腐蚀电位越高,腐蚀电流密度越小。说明合金中锰含量越少,其耐腐蚀性能越好。
Mg-1.5Zn-xMn (x = 0.5,1.0,2.0) alloys were prepared by melt casting method. The microstructure and the microstructure of Mg-1.5Zn-xMn in xenografted Hank’s simulated body fluid were studied by means of optical microscope, immersion corrosion test and electrochemical test. Corrosion behavior. The results show that the as-cast microstructure of Mg-1.5Zn-xMn alloy consists of Mg-Zn phase, α-Mn phase and granular α-Mg precipitate phase. With the increase of manganese content, the α-Mn phase gradually increases , The corrosion area and the rate of the alloy gradually increase; with the decrease of manganese content, the larger the arc resistance radius of the alloy is, the higher the corrosion potential is and the smaller the corrosion current density is. The smaller the manganese content of the alloy, the better its corrosion resistance.