准原位腐蚀研究Sc含量对Al-Zn-Mg合金微观组织及耐蚀性的影响  

Quasi-in situ immersion characterization of grain structures evolution revealing the corrosion resistanc

作　　者：李明高 孙梅玉 孟令晗 郭晓斌 LI Ming-gao;SUN Mei-yu;MENG Ling-han;GUO Xiao-bin(CRRC Industrial Academy Institute Co.,Ltd,Beijing 100036,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]CRRC Industrial Academy Institute Co.,Ltd,Beijing 100036,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Journal of Central South University》2023年第12期3964-3974,共11页中南大学学报（英文版）

基　　金：Project(TC190H3ZV/2)supported by the National Building Project of Application Demonstration Platform on New Materials Products,China。

摘　　要：本文研究了添加Sc对Al-Zn-Mg合金耐蚀性的影响。在Al-Zn-Mg合金中添加Sc可以更有效地阻碍热处理过程中的再结晶,增强其力学性能。添加Sc的合金在晶界析出中表现出显著的不连续性。此外,在Sc含量为0.29 wt.%的合金中,η相在晶界上的分布间距最大,避免了细小连续的η相为腐蚀提供通道,从而增强晶间腐蚀抗性。剥落腐蚀试验和微观结构再结晶分析表明,添加Sc对再结晶有抑制作用,从而提高了耐腐蚀性。准原位腐蚀试验结果表明,Sc含量为0.29 wt.%的Al-Zn-Mg合金的未腐蚀织构呈先快速减少后迅速增多的趋势,由此提出了在Al-Zn-Mg合金腐蚀初期,添加Sc对改善其表面织构和提高其耐蚀性具有重要作用的结论。Al-Zn-Mg alloys have been investigated for the effect of Sc additions on corrosion resistance.The addition of Sc to Al-Zn-Mg alloys can more effectively retard recrystallisation during heat treatment and improve mechanical properties.Sc-added alloys show significant discontinuity in grain boundary precipitation.In addition,the distribution spacing ofηprecipitates at the grain boundary is the largest in the alloy with Sc content of 0.29 wt.%.The exfoliation corrosion test and microstructural recrystallisation analysis show the inhibitory effect of Sc addition on recrystallisation and hence the improvement in corrosion resistance.In-situ immersion corrosion results indicated that the uncorroded texture in Al-Zn-Mg alloy with 0.29 wt.%Sc content first showed a rapid decrease and then a rapid increase.The addition of Sc to Al-Zn-Mg alloy plays an important role in improving the surface texture and increasing the corrosion resistance in the early stages of corrosion.

关 键 词：AL-ZN-MG合金 耐蚀性 剥落腐蚀 微观结构 织构分析 

分 类 号：TG146.21[一般工业技术—材料科学与工程]