崔晓明,于智磊,张晓婷,白朴存,刘飞,杜赵新,曹文涛.析出相对含Ca镁合金腐蚀行为的影响[J].稀有金属材料与工程,2018,47(10):3112~3119.[Cui Xiaoming,Yu zhilei,Zhang xiaoting,Bai pucun,Liu fei,Du zhaoxin,Cao wentao.Effect of the second phases on corrosion behavior of the magnesium alloys with different Ca contents[J].Rare Metal Materials and Engineering,2018,47(10):3112~3119.]
析出相对含Ca镁合金腐蚀行为的影响
投稿时间:2017-10-15  修订日期:2017-11-10
中文关键词:  AZ系镁合金  Ca  析出相  腐蚀行为  SPM
基金项目:内蒙古自治区自然科学(2015MS0526);国家自然科学(11362014);国家自然科学(11672140);内蒙古工业大学科学研究项目(ZD201709);内蒙古工业大学大学生创新项目
中文摘要:
      利用XRD、SEM、TEM和EDS等方法表征了Mg-Al-Zn-xCa(x=0、1.25%、1.74%、2.53%)合金腐蚀前后的组织结构,并采用失重法、电化学法、扫描探针显微镜(SPM)研究了合金腐蚀行为。结果表明:合金主要由α-Mg、β-Mg17Al12、Al2Ca和(Mg,Al)2Ca 组成。随着Ca含量的增加,合金组织中枝晶臂减小,主要沿晶界分布的Mg17Al12尺寸、数量逐渐减小, Al2Ca由骨骼状连接成网状,(Mg,Al)2Ca增多长大。腐蚀测试结果显示:添加Ca后的合金中α+β共晶减少,导致腐蚀通道变窄且比例减小。Ca元素能够使阳极自腐蚀电位升高,形成的Al2Ca阴极相抑制了析氢过程。合金中主要析出相Al2Ca 与α-Mg的电势差小于β-Mg17Al12与α-Mg的电势差。
Effect of the second phases on corrosion behavior of the magnesium alloys with different Ca contents
英文关键词:Mg-Al-Zn series magnesium alloy  Ca  Second phases  Corrosion behavior  SPM
英文摘要:
      The microstructure of Mg-Al-Zn-xCa (x=0%, 1.25%, 1.74%, 2.53%) alloy before and corroded has been characterized by XRD, SEM, TEM and EDS. And the corrosion behavior has been studied by weight-loss, electrochemical method and SPM. Results shown that the phase composition consists mainly of α-Mg, β-Mg17Al12, Al2Ca and (Mg, Al)2Ca. With the increasing of Ca, the size of dendritic arm decreased, and the scale and number of Mg17Al12 phase decreased gradually. The shape of Al2Ca phase transformed from bonelike to network on grain boundary, and (Mg, Al)2Ca phase increased gradually. The result of corrosion behavior testing shown that the content of α+β eutectic reduced by addition of Ca, and therefore led to the corrosion channel narrowed and the proportion decreased. The formed Al2Ca cathode phase inhibited the hydrogen precipitation process and adding Ca led to an increase in anodic corrosion potential. The potential differences of Al2Ca and α-Mg are lower than β-Mg17Al12and α-Mg.
作者单位E-mail
崔晓明 内蒙古工业大学 84854817@qq.com 
于智磊 内蒙古工业大学  
张晓婷 内蒙古工业大学  
白朴存 内蒙古工业大学  
刘飞 内蒙古工业大学  
杜赵新 内蒙古工业大学  
曹文涛 内蒙古工业大学  
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