ZA27合金晶间腐蚀电子理论研究  

Influence of RE and Impurity Elements on the Intergranular Corrosion of ZA27 Alloys

作　　者：郭玉福[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料学院,沈阳110023

出　　处：《中国铸造装备与技术》2006年第3期31-33,共3页China Foundry Machinery & Technology

基　　金：国家自然科学基金(50571071);辽宁省教育厅科学研究计划(05L297);沈阳市科技计划基金(1041020-1-04-6)资助

摘　　要：为从本质上了解杂质与稀土元素Y对锌铝合金晶间腐蚀的影响,探索抑制合金晶间腐蚀的有效途径,依据晶界的大角度重位点阵理论建立了含稀土、杂质及η相颗粒的α相大角度晶界原子集团模型,采用递归法计算了α相晶界间的电荷转移,由此讨论了杂质(Pb、Sn、Cd)及稀土元素Y对Zn、Al电极电位的影响。结果表明:杂质Pb、Sn、Cd增大原子间的电荷转移量,提高Zn、Al电极电位差,加速合金的腐蚀,稀土元素减小原子间的电荷转移量,降低Zn、Al电极电位差,具有抑制晶间腐蚀的作用。To understand the influence of impurities and Rare Earth elements in nature on the intergranular corrosion of the zinc-aluminum alloys, taking efficient methods to retard the intergranular corrosion,the atomic cluster of α phase grain boundary including impurities （Pb.Sn.Cd）,Rare Earth elements （ La.Y ） and η phase grain has been constructed by computer programming based on the coincidence-site lattice theory.Recursion method has been used to calculate the charge transfer over the grain boundary of of phase and influence of impurities （Pb.Sn.Cd） and Rare Earth elements（La.Y） on the electrode-potential of Zn and AI has been discussed with results that： impurity element （Pb,Sn,Cd） can increase the charge transfer between atoms over the grain boundary, leading to the large difference of electrode -potential between Zn and AI,so the eroding is speeding up;but the RE element can reduce the charge transfer between atoms over the grain boundary,lower the difference of electrode-potential between Zn and Al,so RE element is of the role of restraining the intergranular corrosion of zinc-aluminum alloys.

关 键 词：稀土 锌铝合金 递归方法 晶间腐蚀 

分 类 号：TG172.9[金属学及工艺—金属表面处理]