单道次轧制对纯镁组织和耐腐蚀性的影响  

Effect of Single-pass Rolling on Microstructure and Corrosion Resistance of Pure Magnesium

作　　者：温力 王禹涵 滕雨蔓 WEN Li;WANG Yuhan;TENG Yuman(Electric Power Research Institute of State Grid Tianjin Electric Power Company,Tianjin 300384,China;Materials Company of State Grid Tianjin Electric Power Company,Tianjin 300304,China)

机构地区：[1]国网天津市电力公司电力科学研究院,天津300384 [2]国网天津市电力公司物资公司,天津300304

出　　处：《热加工工艺》2022年第21期50-53,共4页Hot Working Technology

摘　　要：采用金相观察、静拉伸、电化学极化和腐蚀浸泡等实验方法,研究了单道次轧制变形量对纯镁组织、力学性能和耐腐蚀性的影响。结果发现:随着变形量的增加,纯镁晶粒尺寸逐渐减小,晶界增多,导致其强度增加,耐腐蚀性能提高。当单道次轧制变形量为65%时,与未变形样品相比纯镁平均晶粒尺寸由65.94μm减小至12.58μm,自腐蚀电位正移0.0215 V,自腐蚀电流密度降低约32.3%,其在SBF模拟体液中的腐蚀速率为0.967 mm/a,降低了14.3%,表明通过单道次大应变轧制可以有效提高纯镁的耐蚀性。The influence of single-pass deformation on the microstructure, mechanical properties and corrosion resistance of pure magnesium was studied by metallographic observation, static tension, electrochemical polarization and corrosion immersion. The results show that with the increase of the single-pass rolling deformation, the grain size of pure magnesium decreases gradually and the grain boundary increases, which leads to the increase of strength and corrosion resistance. When the single-pass rolling deformation is 65%, the average grain size of pure magnesium decreases from 65.94 μm to 12.58 μm,the self-corrosion potential positively shift 0.0215 V, the self-corrosion current density is reduced by about 32.3% compared with that of the undeformed sample. The corrosion rate in SBF simulated body fluid is 0.967 mm/a, which reduces 14.3%,indicating that the corrosion resistance of pure magnesium can be effectively improved by single pass large strain rolling.

关 键 词：纯镁 轧制 变形量 耐腐蚀性能 

分 类 号：TG339[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]