Effects of surface preparation on the corrosion resistance of TSA anodized aluminum alloys
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Materials Research-Ibero-american Journal of Materials
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This 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.
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PEREIRA, 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. Materials Research-Ibero-american Journal of Materials, v. 28, p. 1-10, 2025. DOI: 10.1590/1980-5373-MR-2025-0452. Disponível em: https://repositorio.ipen.br/handle/123456789/49285. Acesso em: 09 Feb 2026.
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