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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(英文),2018,47(10):3112~3119.[Cui Xiaoming,Yu zhilei,Zhang xiaoting,Bai pucun,Liu fei,Du zhaoxin and 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.]
Effect of the second phases on corrosion behavior of the magnesium alloys with different Ca contents
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Received:October 15, 2017  Revised:November 10, 2017
DOI:
Key words: Mg-Al-Zn series magnesium alloy  Ca  Second phases  Corrosion behavior  SPM
Foundation item: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
Author NameAffiliation
Cui Xiaoming,Yu zhilei,Zhang xiaoting,Bai pucun,Liu fei,Du zhaoxin and Cao wentao  
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Abstract:
      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.