PEREIRA, BRUNO N.ARAUJO, JOAO V de S.KLUMPP, RAFAEL E.ANTUNES, RENATO A.COSTA, ISOLDA2026-02-042026-02-042025PEREIRA, BRUNO N.; ARAUJO, JOÃO V de S.; KLUMPP, RAFAEL E.; ANTUNES, RENATO A.; COSTA, ISOLDA. Effects of surface preparation on the corrosion resistance of TSA anodized aluminum alloys. <b>Materials Research-Ibero-american Journal of Materials</b>, v. 28, p. 1-10, 2025. DOI: <a href="https://dx.doi.org/10.1590/1980-5373-MR-2025-0452">10.1590/1980-5373-MR-2025-0452</a>. Disponível em: https://repositorio.ipen.br/handle/123456789/49285.1516-1439https://repositorio.ipen.br/handle/123456789/49285This study examines the impact of surface preparation on the corrosion resistance of anodized AA2198-T851 aluminum alloy. Two pretreatment methods were employed: (i) alkaline degreasing in 10 wt.% NaOH at 60 °C followed by de-smutting in 30 vol.% HNO3, and (ii) etching in an oxidizing acidic solution (K3 Smutt-Go, 7 V, 20 °C) intended to remove copper-containing intermetallic particles. Surface preparation methods were analyzed using SEM, FEG-SEM, SEM-EDS, and XPS. Corrosion resistance was tested through EIS, and NSST. All electrochemical tests were conducted in 0.1 mol L−1 NaCl solution, and the NSST followed ASTM B117-16. The findings show that removing intermetallic particles greatly improves the corrosion resistance of TSA-anodized AA2198-T851. Among the tested conditions, the etched samples exhibited superior performance, showing no observable corrosion after 336 hours of salt spray exposure, confirming their enhanced corrosion resistance.1-10engopenAccessArtigo de periódico2810.1590/1980-5373-MR-2025-0452https://orcid.org/0000-0002-4987-333417.042.00