EIS investigation of a Ce‐based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA
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2019
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Surface and Interface Analysis
Resumo
In the aircraft industry, anodizing and posttreatment steps use Cr (VI) compounds,
which, despite offering good corrosion resistance and self‐healing properties, are
highly toxic and carcinogenic. Ce compounds are recognized as efficient corrosion
inhibitors for Al alloys, and several works report self‐healing ability for these
chemicals. In this investigation, the corrosion resistance of Alclad AA2024‐T3 alloy
anodized in tartaric‐sulphuric acid (TSA) bath and posttreated in a solution comprising
cerium nitrate without and with hydrogen peroxide was evaluated. The purpose is to
investigate the potentiality of using hydrothermal treatment in Ce nitrate solution as
candidate to replace Cr (VI) posttreatment. The aim is to provide a posttreatment step
which, while improving the corrosion resistance, does not plug the mouths of the
pores maintaining the adhesion properties of the porous anodic layer. Microstructural
characterization was carried out by SEM‐EDS whereas corrosion resistance was evaluated
by EIS. The surface analysis showed that the posttreatments, all performed at
50°C, kept the open structure of the pores. EIS analysis showed that the
posttreatments performed in the H2O2 solution for short immersion times were the
most effective in improving the corrosion resistance of the samples, whereas electrical
equivalent circuit (EEC) fitting of the data indicated sealing of the porous layer
during the immersion of the different samples in the test solution. SEM‐EDS analysis
of the samples posttreated in the H2O2 containing solution, prior and after the corrosion
test, showed the presence of Ce oxy‐hydroxide randomly deposited on the sample
surface, indicating that Ce could be incorporated/stored in the anodic layer.
Como referenciar
RAMIREZ, OSCAR M.P.; QUEIROZ, FERNANDA M.; TERADA, MAYSA; DONATUS, UYIME; COSTA, ISOLDA; OLIVIER, MARIE-GEORGES; MELO, HERCILIO G. de. EIS investigation of a Ce‐based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA. Surface and Interface Analysis, v. 51, n. 12, p. 1260-1275, 2019. SI. DOI: 10.1002/sia.6633. Disponível em: http://repositorio.ipen.br/handle/123456789/30321. Acesso em: 28 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.