Volume 75, Issue 10 pp. 1373-1388
ARTICLE

Insight into the crevice corrosion mechanism of AA7075-T651 high-strength aluminum alloys in neutral nitrate solution: The effect of Cl

Yuan Li

Yuan Li

College of Materials Science and Engineering, Ocean University of China, Qingdao, China

Search for more papers by this author
Yixin Tang

Yixin Tang

College of Materials Science and Engineering, Ocean University of China, Qingdao, China

Search for more papers by this author
Xiaohang Liu

Xiaohang Liu

College of Materials Science and Engineering, Ocean University of China, Qingdao, China

Search for more papers by this author
Yizhou Li

Corresponding Author

Yizhou Li

College of Materials Science and Engineering, Ocean University of China, Qingdao, China

Correspondence Yizhou Li, College of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.

Email: [email protected]

Search for more papers by this author
First published: 18 May 2024
Citations: 2

Yuan Li and Yixin Tang contributed equally to this study.

Abstract

The crevice corrosion behavior and mechanism of AA7075-T651 aluminum alloy was investigated by electrochemical measurements and surface analysis technologies in a neutral nitrate solution with different contents of NaCl. The Cl was identified as crucial for the initiation and development of the crevice corrosion, with the phenomenon absent in the 0.05 M NaCl solution but initiated in the 0.5 and 1 M NaCl solutions. However, the crevice corrosion was more pronounced in the 0.5 M NaCl solution due to the establishment of a larger galvanic corrosion effect. The rapid dissolution of the anodic phase resulted in the increased Cl inside the crevice, while the cathodic phase enhanced the localized dissolution through micro-galvanic corrosion. This synergistic effect significantly facilitated the development of crevice corrosion.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available on request from the corresponding author.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.