The effect of acid pickling on the corrosion behavior of a cerium conversion-coated AA2198-T851 Al-Cu-Li alloy
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2020
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Journal of Materials Engineering and Performance
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The effect of acid pickling pretreatments prior to cerium conversion coating process on the corrosion
behavior of AA2198-T851 alloy substrates was investigated. Three acid pretreatments were employed:
nitric acid (HNO3), phosphoric acid (H3PO4) and sulfuric acid (H2SO4). The cerium conversion coating
process was performed using a batch solution composed of cerium nitrate and hydrogen peroxide.
Microscopic techniques, electrochemical impedance spectroscopy, polarization resistance and open-circuit
potential measurements were employed to investigate the effect of each acid pretreatment. The untreated
and nitric acid pretreated substrates presented more defective cerium conversion layers than the substrates
treated with phosphoric and sulfuric acids. Accordingly, the corrosion resistance of the untreated and nitric
acid-treated substrates was very low, while that of the substrates treated with phosphoric acid and sulfuric
acids were greatly improved. The sulfuric acid pickling treatment was the best pretreatment before cerium
conversion coating among the investigated pretreatments on the AA2198-T851 Al-Cu-Li alloy.
Como referenciar
KLUMPP, RAFAEL E.; DONATUS, UYIME; ARAUJO, JOAO V.S.; REDÍGOLO, MARCELO M.; MACHADO, CARULINE de S.C.; COSTA, ISOLDA. The effect of acid pickling on the corrosion behavior of a cerium conversion-coated AA2198-T851 Al-Cu-Li alloy. Journal of Materials Engineering and Performance, v. 29, n. 1, p. 167-174, 2020. DOI: 10.1007/s11665-019-04551-9. Disponível em: http://repositorio.ipen.br/handle/123456789/31097. Acesso em: 19 Apr 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.