摘要
采用半连续铸造法制备出4种具有不同微合金化元素的Mg-15Gd-0.2X(X=Mn、Ni、Zn、Sn)合金,利用OM、SEM、XRD观察合金微观形貌,分析合金显微组织,通过浸泡腐蚀和析氢实验对合金耐蚀性进行测试,研究不同微合金化元素对Mg-15Gd合金微观组织和耐蚀性能的影响。结果表明,微合金化元素的添加明显改善了合金的铸态组织,细化了晶粒和第二相,并使第二相Mg5Gd沿晶界呈网状分布。添加微量合金化元素后,除Mg-15Gd-0.2Ni合金外,合金的耐蚀性均有明显提高,主要与合金晶粒细化、第二相细化并沿晶界呈网状分布,对合金腐蚀有阻挡作用以及合金腐蚀产物膜完整致密、保护性好有关。
Four kinds of Mg-15Gd-0.2X(X=Mn,Ni,Zn,Sn)alloys with different microalloying elements were prepared by semicontinuous casting method.OM,SEM and XRD were used to observe the microstructure of the alloys,analyze the microstructure of the alloys,and test the corrosion resistance of the alloys by immersion corrosion and hydrogen evolution experiments.The effects of different microalloying elements on microstructures and corrosion resistance of Mg-15Gd alloy were studied.The results show that the addition of microalloying elements obviously improves the as-cast microstructure,refines the grain and the second phase,and makes the second phase MgsGd distribute in a network along the grain boundary.The corrosion resistance of all the alloys except Mg-15Gd-0.2Ni alloy is improved significantly after the addition of microalloying elements,which is mainly related to the grain refinement,the second phase refinement and the network distribution along the grain boundary,the blocking effect on the corrosion of the alloy,and the complete and compact alloy corrosion product film with good protection.
作者
付广艳
周尧
李荣广
薛丰
FU Guangyan;ZHOU Yao;LI Rongguang;XUE Feng(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《热加工工艺》
北大核心
2024年第21期125-129,共5页
Hot Working Technology
基金
国家自然科学基金面上项目(52171121)。
关键词
镁合金
微合金化元素
显微组织
耐蚀性能
magnesium alloy
microalloying elements
microstructure
corrosion resistance
