Influence of aging time on the corrosion behavior of 6061 Al alloy in alkaline solution

• Autor(a) principal: CORREA, OLANDIR V.
• Data de Publicação: 2016
• Outros Autores: SOUZA, JOSE A.B. de, OLIVEIRA, MARA C.L. de, ANTUNES, RENATO A., CONGRESSO BRASILEIRO DE CORROS??O, 34.; INTERNATIONAL CORROSION MEETING, 5th.; CONGRESO IBEROAMERICANO DE CORROSI??N Y PROTECCI??N, 10th.; CONCURSO DE FOTOGRAFIA DE CORROS??O E DEGRADA????O DE MATERIAIS, 19.; EXPOSI????O DE TECNOLOGIAS PARA PREVEN????O E CONTROLE DA CORROS??O, 34
• Tipo de documento: Artigo de conferência
• Título da fonte: Repositório Institucional do IPEN
• Texto Completo: http://repositorio.ipen.br/handle/123456789/26435
• topic: aluminium alloys; precipitation hardening; corrosion; aging; hydroxides; evaluation; polarization; spectroscopy

Al alloys of the 6XXX series (Al-Mg-Si) are employed as structural materials in a variety of industrial applications due to a combination of high mechanical strength and good corrosion resistance. The final mechanical properties are achieved after specific precipitation hardening heat treatments. The aging time during precipitation hardening is known to affect these properties and can also influence the corrosion resistance of the alloy. The susceptibility of Al alloys to corrosion in alkaline media is well-known. In this work the effect of aging time on the corrosion behavior of 6061 Al alloy was evaluated in NaOH and NaCl solutions. The material was aged at 200 ??C for times ranging from 1 to 36 h. The corrosion behavior of the aged alloy was studied using potentiodynamic polarization and electrochemical impedance spectroscopy. The results showed that the corrosion resistance was progressively lower for increasing aging times up to 8 h in NaCl and up to 24 h in NaOH. Longer aging times led to a decrease of the corrosion current density.