摘要
为了研究具有混晶组织的轧制AZ31镁合金板材中细晶、粗晶和孪晶对其腐蚀行为的影响,对轧制AZ31镁合金混晶板材进行组织观测和电化学腐蚀实验.结果表明:轧制温度为370℃、平均应变速率为4.0 s-1时的混晶板材由于具有较大的细晶占比、较小的粗晶占比和孪晶密度,且在阳极极化过程中产生了明显的拐点,因此其耐腐蚀性最好;在混晶AZ31镁合金板材中,细晶占比高、粗晶占比低以及孪晶密度小能显著提升其耐腐蚀性;在板材的轧向-横向边缘组织中分布的晶粒越粗大,则极化电阻越小,腐蚀电流越大,耐腐蚀性越差.
In order to study the effect of fine grain,coarse grain and twin on the corrosion behavior of rolled AZ31 magnesium alloy sheet with mixed crystal structure,the microstructure observation and electrochemical corrosion experiment of rolled AZ31 magnesium alloy mixed crystal sheet are carried out.The results show that when the rolling temperature is 370℃and the average strain rate is 4.0 s-1,the mixed crystal sheet has the best corrosion resistance due to its large proportion of fine grain,small proportion of coarse grain and twin density,and obvious inflection point in the anodic polarization process.In the mixed crystal AZ31 magnesium alloy sheet,the proportion of fine grains in the microstructure characteristics is large,the proportion of coarse grain is small and the twin density is small,which has a significantly positive effect on the corrosion resistance.The coarser the grain distributed in the rolling direction⁃transverse direction edge structure of the plate,the smaller the polarization resistance, the larger the corrosion current, and the worse the corrosion resistance.
作者
刘筱
李柯
贺丹丹
朱必武
李落星
徐从昌
魏福安
LIU Xiao;LI Ke;HE Dandan;ZHU Biwu;LI Luoxing;XU Congchang;WEI Fu'an(Hunan Engineering Research Center of Evaluation of Forming Technology and Damage Resistance of High Efficiency Light Alloy Components,School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Research Institute of HNU in Chongqing,Hunan University,Chongqing 401120,China;Salt Lake Chemical Engineering Research Complex,Qinghai University,Xining 810016,China)
出处
《湖南科技大学学报(自然科学版)》
北大核心
2025年第3期97-104,共8页
Journal of Hunan University of Science And Technology:Natural Science Edition
基金
国家自然科学基金项目(52071139
52475356
524771132)
重庆市自然科学基金项目(CSTB2023NSCQ-MSX0886)
青海大学盐湖化工大型系列研究设施开放研究项目(2023-DXSSKF-04)。
关键词
AZ31镁合金
细晶
粗晶
孪晶
腐蚀
AZ31 magnesium alloy
fine grain
coarse grain
twin
corrosion
