摘要
采用累积叠轧ARB工艺对AZ63镁合金板材在400℃下进行了5个道次剧塑性变形,通过析氢实验、失重实验、电化学实验和腐蚀形貌观察研究了经过累积叠轧工艺后AZ63镁合金板材在3.5%(质量分数)Na Cl溶液中的腐蚀行为。结果表明,随着累积叠轧道次的增加,AZ63镁合金发生动态再结晶,晶粒得以显著细化和均匀化;ARB4后的镁合金板材晶粒最为细小、均匀(约10μm),ARB5后有晶粒部分长大的现象。累积叠轧后的AZ63镁合金的耐蚀性能得以提高,其中轧制4个道次后耐腐蚀性能最好,失重速率为47.4672 mg·cm-2·h-1,自腐蚀电位为-1.3350 V,自腐蚀电流密度为1.0 A·cm-2,腐蚀行为由严重的全面、均匀腐蚀转变为局部腐蚀。
AZ63 magnesium alloy sheet was subjected to five passes of severe plastic deformation at 400℃by accumulative roll bonding(ARB).The corrosion behavior of the ARBed AZ63 magnesium alloy sheet in 3.5%(mass fraction)NaCl solution was studied by hydrogen evolution experiment,weight loss experiment,electrochemical experiments and corrosion morphology observation.The results show that the dynamic recrystallization of AZ63 magnesium alloy occurs with the increase of accumulative rolling pass,and the grains are refined and homogenized remarkably.After ARB4,the grain size of magnesium alloy sheet is the most uniform and timest(about 10μm),some grains grow after ARB5.The corrosion resistance of AZ63 magnesium alloy after accumulative roll bonding is improved,and the corrosion resistance of AZ63 magnesium alloy after four passes rolling is the best with the weight loss rate of 47.4672 mg·cm-2·h-1,the self corrosion potential of-1.3350 V,and the self corrosion current density of 1.0 A·cm-2,the corrosion behavior changes from serious overall and uniform corrosion to local corrosion.
作者
于孟华
郭俊卿
陈拂晓
皇涛
钟时雨
YU Meng-hua;GUO Jun-qing;CHEN Fu-xiao;HUANG Tao;ZHONG Shi-yu(School of Materials Science&Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Province and Education Ministry Collaborative Innovation Center of New Material and Advanced Processing Technology of Nonferrous Metals,Luoyang 471023,China;Chengdu Galaxy Power Co.,Ltd.,Chengdu 610000,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第6期90-97,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51741503
51875176)
中国博士后科学基金面上基金资助项目(2016M590677)
凝固技术国家重点实验室开放课题资助项目(SKLSP201631)
关键词
AZ63镁合金
累积叠轧
微观组织
耐蚀性能
AZ63 magnesium alloy
accumulative roll bonding
microstructure
corrosion resistance
