高强度Al-Zn-Mg-Cu合金晶间腐蚀机理的新认识

IF 7.4 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hao Liu , Liankui Wu , Fahe Cao , Qingqing Sun
{"title":"高强度Al-Zn-Mg-Cu合金晶间腐蚀机理的新认识","authors":"Hao Liu ,&nbsp;Liankui Wu ,&nbsp;Fahe Cao ,&nbsp;Qingqing Sun","doi":"10.1016/j.corsci.2025.113364","DOIUrl":null,"url":null,"abstract":"<div><div>This study provides new insights into the intergranular corrosion (IGC) mechanism of high-strength Al-Zn-Mg-Cu alloys (i.e., 7000 series Al alloys). Utilizing FIB, SEM, and TEM techniques, the microstructural evolution of 7055, 7150, and 7085 Al alloys during IGC in 3.5 wt% NaCl solution was characterized. Results confirm that IGC preferentially initiates at anodic grain boundary precipitates (GBPs, MgZn<sub>2</sub>) and propagates along precipitation-free zones (PFZs) and the adjacent aluminum matrix. Furthermore, nano/submicro-scale Al<sub>2</sub>Cu precipitates (50 ∼ 300 nm) and Cu clusters (∼50 nm) distributed along the corroded grain boundaries serve as active cathodic phases, promoting IGC propagation through PFZs while simultaneously accelerating localized dissolution of the adjacent aluminum matrix. This cathodic acceleration contributes to a characteristic corrosion width of 100 ∼ 300 nm within the aluminum matrix. ‌The discovery of Al<sub>2</sub>Cu precipitates/Cu clusters and their roles in intergranular corrosion has significantly enhanced the understanding of IGC mechanism in 7000 series Al alloys.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"257 ","pages":"Article 113364"},"PeriodicalIF":7.4000,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"New insights into intergranular corrosion mechanism of high-strength Al-Zn-Mg-Cu alloys\",\"authors\":\"Hao Liu ,&nbsp;Liankui Wu ,&nbsp;Fahe Cao ,&nbsp;Qingqing Sun\",\"doi\":\"10.1016/j.corsci.2025.113364\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study provides new insights into the intergranular corrosion (IGC) mechanism of high-strength Al-Zn-Mg-Cu alloys (i.e., 7000 series Al alloys). Utilizing FIB, SEM, and TEM techniques, the microstructural evolution of 7055, 7150, and 7085 Al alloys during IGC in 3.5 wt% NaCl solution was characterized. Results confirm that IGC preferentially initiates at anodic grain boundary precipitates (GBPs, MgZn<sub>2</sub>) and propagates along precipitation-free zones (PFZs) and the adjacent aluminum matrix. Furthermore, nano/submicro-scale Al<sub>2</sub>Cu precipitates (50 ∼ 300 nm) and Cu clusters (∼50 nm) distributed along the corroded grain boundaries serve as active cathodic phases, promoting IGC propagation through PFZs while simultaneously accelerating localized dissolution of the adjacent aluminum matrix. This cathodic acceleration contributes to a characteristic corrosion width of 100 ∼ 300 nm within the aluminum matrix. ‌The discovery of Al<sub>2</sub>Cu precipitates/Cu clusters and their roles in intergranular corrosion has significantly enhanced the understanding of IGC mechanism in 7000 series Al alloys.</div></div>\",\"PeriodicalId\":290,\"journal\":{\"name\":\"Corrosion Science\",\"volume\":\"257 \",\"pages\":\"Article 113364\"},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2025-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Corrosion Science\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0010938X25006924\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X25006924","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

摘要

本研究为高强度Al- zn - mg - cu合金(即7000系铝合金)的晶间腐蚀(IGC)机理提供了新的认识。利用FIB、SEM和TEM技术,对7055、7150和7085铝合金在3.5 wt% NaCl溶液中IGC过程中的组织演变进行了表征。结果证实,IGC优先从阳极晶界析出(GBPs、MgZn2)开始,并沿无析出区(PFZs)和邻近的铝基体扩散。此外,沿腐蚀晶界分布的纳米/亚微米级Al2Cu析出相(50 ~ 300 nm)和Cu团簇(~ 50 nm)作为活跃的阴极相,促进了IGC在pfz中的传播,同时加速了邻近铝基体的局部溶解。这种阴极加速导致铝基体内的特征腐蚀宽度为100 ~ 300 nm。Al2Cu析出物/Cu团簇及其在晶间腐蚀中的作用的发现,极大地提高了对7000系铝合金IGC机制的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New insights into intergranular corrosion mechanism of high-strength Al-Zn-Mg-Cu alloys
This study provides new insights into the intergranular corrosion (IGC) mechanism of high-strength Al-Zn-Mg-Cu alloys (i.e., 7000 series Al alloys). Utilizing FIB, SEM, and TEM techniques, the microstructural evolution of 7055, 7150, and 7085 Al alloys during IGC in 3.5 wt% NaCl solution was characterized. Results confirm that IGC preferentially initiates at anodic grain boundary precipitates (GBPs, MgZn2) and propagates along precipitation-free zones (PFZs) and the adjacent aluminum matrix. Furthermore, nano/submicro-scale Al2Cu precipitates (50 ∼ 300 nm) and Cu clusters (∼50 nm) distributed along the corroded grain boundaries serve as active cathodic phases, promoting IGC propagation through PFZs while simultaneously accelerating localized dissolution of the adjacent aluminum matrix. This cathodic acceleration contributes to a characteristic corrosion width of 100 ∼ 300 nm within the aluminum matrix. ‌The discovery of Al2Cu precipitates/Cu clusters and their roles in intergranular corrosion has significantly enhanced the understanding of IGC mechanism in 7000 series Al alloys.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Corrosion Science
Corrosion Science 工程技术-材料科学:综合
CiteScore
13.60
自引率
18.10%
发文量
763
审稿时长
46 days
期刊介绍: Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信