Investigation on the Effect of a Chromium-Free Sealing Treatment for the Corrosion Resistance of AA2198-T851 after Tartaric Sulphuric Anodizing (TSA)
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2023
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Corrosion and Materials Degradation
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Resumo
The AA 2198-T851 is a third-generation Al-Li alloy developed for use in the aircraft industry.
Al-Li alloys are susceptible to localized corrosion due to their complex microstructure resulting from
the used thermomechanical treatment. In order to prevent localized corrosion, these alloys are usually
protected by anodizing in order to avoid a corrosive environment. Subsequently, for anodizing, a
sealing treatment is usually performed for parts. Some sealing treatments use hexavalent-chromiumion-containing solutions. In this investigation, a chromium-free sealing treatment in a solution with
cerium ions has been carried out, and the effect on the corrosion resistance of the AA2198-T851
alloy was investigated. Hydrothermally sealed or unsealed samples were also tested for corrosion
resistance for comparison reasons. The corrosion resistance of the anodized aluminum alloy, either
hydrothermally sealed or in a cerium-ion-containing solution, was evaluated in a sodium chloride
solution by electrochemical impedance spectroscopy as a function of immersion time. The samples
sealed in a cerium-containing solution increased their corrosion resistance when compared to the
hydrothermally sealed. The effectiveness of the sealing process with cerium that was observed in the
electrochemical tests indicated that after the corrosive attack of the barrier layer, there was a “sealing”
process of the sample surface.
Como referenciar
QUEIROZ, FERNANDA M.; BUGARIN, ALINE de F.S.; AYUSSO, VICTOR H.; TERADA, MAYSA; COSTA, ISOLDA. Investigation on the Effect of a Chromium-Free Sealing Treatment for the Corrosion Resistance of AA2198-T851 after Tartaric Sulphuric Anodizing (TSA). Corrosion and Materials Degradation, v. 4, n. 2, p. 331-344, 2023. DOI: 10.3390/cmd4020017. Disponível em: http://repositorio.ipen.br/handle/123456789/34225. Acesso em: 12 May 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.