Quantifying intergranular corrosion susceptibility in AA2098‐T351 weldments through friction stir welding
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Materials and Corrosion
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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 and electrochemical impedance measurements, with comparative analyses against unwelded alloys (BS). The key findings depicted that FSW-induced microstructure changes significantly influenced IGC susceptibility across different zones. Zones affected by FSW presented distinct susceptibilities compared with the base metal (BM). The ASTM G110-92 test effectively differentiated the heat-affected zone (HAZ) into segments with changing corrosion resistances based on welding temperature gradients. Cross-sectional analyses using scanning electron microscopy (SEM) techniques correlated corrosion characteristics with microstructural features identified by transmission electron microscopy (TEM). Overall, FSW-induced microstructural alterations emerged as a predominant factor influencing the varying susceptibilities of different zones to IGC, and electrochemical impedance measurements (EIS) validated the findings from ASTM G110-92 practice.
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MILAGRE, MARIANA X.; DONATUS, UYIME; MOGILI, NAGA V.; MACHADO, CARULINE S.C.; ARAUJO, JOAO V.S.; SILVA, REJANE M.P.; ANTUNES, RENATO A.; FAROOQ, SAJID; COSTA, ISOLDA. Quantifying intergranular corrosion susceptibility in AA2098‐T351 weldments through friction stir welding. Materials and Corrosion, v. 75, n. 10, p. 1359-1372, 2024. DOI: 10.1002/maco.202314245. Disponível em: https://repositorio.ipen.br/handle/123456789/48714. Acesso em: 30 Dec 2025.
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