Quantifying intergranular corrosion susceptibility in AA2098‐T351 weldments through friction stir welding

• DOI: 10.1002/maco.202314245
• Publication Date: 2024-06-11T06:11:20Z
• Authors: Mariana X. Milagre; Uyime Donatus; Naga V. Mogili; Caruline S. C. Ma...; João Victor. S. A...; Rejane Maria P. S...; Renato A. Antunes; Sajid Farooq; Isolda Costa
• Keywords: Friction Stir Welding; Base metal

Abstract In this study, the intergranular corrosion (IGC) susceptibility of AA2098‐T351 welds, fabricated through friction stir welding (FSW), was systematically evaluated. The evaluation employed American Society for Testing and Materials (ASTM) G110‐92 practice electrochemical impedance measurements, with comparative analyses against unwelded alloys (BS). key findings depicted that FSW‐induced microstructure changes significantly influenced IGC across different zones. Zones affected by FSW presented distinct susceptibilities compared base metal (BM). ASTM test effectively differentiated heat‐affected zone (HAZ) into segments changing resistances based on temperature gradients. Cross‐sectional using scanning electron microscopy (SEM) techniques correlated characteristics microstructural features identified transmission (TEM). Overall, alterations emerged as a predominant factor influencing varying zones to IGC, measurements (EIS) validated from practice.