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通过XRD和扫描电镜对不同冷却方式(水淬、随炉冷)均匀化处理的Mg-6Gd-3Y-1Zn-0.5Zr镁合金的显微组织进行观察,并通过质量损失试验和电化学试验研究水淬及随炉冷样品在质量分数为5%Na Cl溶液中的腐蚀性能。结果表明:水淬样品主要由α-Mg固溶体和晶界上的块状长周期结构(LPSO)组成,而随炉冷样品除α-Mg固溶体和晶界上的块状LPSO外,晶内还分布着大量的片层状LPSO;晶内片层状的LPSO增加阴极相的数量,加速镁基体的腐蚀,故随炉冷样品在5%Na Cl水溶液中的质量损失速度大于水淬样品。
The microstructure of Mg-6Gd-3Y-1Zn-0.5Zr magnesium alloy homogenized by different cooling methods (water quenching and furnace cooling) was observed by XRD and SEM. The results of mass loss and electrochemical tests Water quenching and corrosion of the sample with 5% NaCl solution in the furnace. The results show that the water-quenched samples mainly consist of α-Mg solid solution and massive long-period structure (LPSO) on the grain boundary. In addition to the α-Mg solid solution and the massive LPSO on the grain boundary, A large number of lamellar LPSOs were distributed. LPSO in lamellar form increased the number of cathode phases and accelerated the corrosion of magnesium matrix. Therefore, the mass loss rate of 5% NaCl aqueous solution with furnace cold samples was faster than that of water quenched samples.