不同组织状态下AZ91D镁合金耐腐蚀性能研究  

Study on Corrosion Resistance of AZ91D Magnesium Alloy with Different Microstructure

作　　者：付广艳[1] 杨龙飞[1] 薛丰 FU Guangyan;YANG Longfei;XUE Feng(Shenyang University of Chemical Technology,Shenyang Liaoning110142,China)

机构地区：[1]沈阳化工大学,辽宁沈阳110142

出　　处：《辽宁化工》2025年第4期537-540,共4页Liaoning Chemical Industry

基　　金：国家自然科学基金项目(项目编号:52201131)。

摘　　要：通过光学显微镜、电子显微镜、XRD对铸态、固溶态、挤压态AZ91D镁合金进行显微组织分析观察;通过对铸态、固溶态、挤压态AZ91D镁合金的动电位极化、盐雾腐蚀、浸泡腐蚀失重实验进行腐蚀研究及分析。结果表明:经热挤压工艺处理后的AZ91D镁合金耐腐蚀性能最好。热挤压工艺细化了AZ91D合金晶粒,使AZ91D镁合金成分均匀,β相在晶界处分布连续。β相本身较耐蚀,还受到α相的阴极保护,当β相的数量较多且分布连续时,会抑制腐蚀的进行,在AZ91D镁合金腐蚀过程中起到正向保护作用,有效提高了AZ91D镁合金的耐腐蚀性能。The microstructures of as-cast,solid-solution and extruded AZ91D magnesium alloy samples were analyzed and observed by optical microscope,electron microscope and XRD.The corrosion research and analysis of as-cast,solid-solution and extruded AZ91D magnesium alloy were carried out,including progress potential polarization,salt spray corrosion experiment and immersion corrosion loss experiment.The results showed that the corrosion resistance of AZ91D magnesium alloy treated by hot extrusion process was the best.The AZ91D alloy grains were refined by hot extrusion process,so that the composition of AZ91D alloy was uniform and theβphase was distributed continuously at the grain boundary.Theβphase itself is relatively resistant to corrosion,and is also protected by the cathodic protection ofαphase.When the quantity ofβphase is large and the distribution is continuous,the corrosion will be inhibited,which plays a positive protective role in the corrosion process of AZ91D magnesium alloy,and effectively improves the corrosion resistance of AZ91D.

关 键 词：镁合金 热处理 挤压 显微组织 耐腐蚀性 

分 类 号：TG172.5[金属学及工艺—金属表面处理]