Comparison of the corrosion resistance of AA2024 and AA2098 alloys in different solutions

• Autor(a) principal: MILAGRE, MARIANA X.
• Data de Publicação: 2019
• Outros Autores: ARAUJO, JOAO V. de S., GOMES, MAURILIO P., DONATUS, UYIME, MACHADO, CARULINE S.C., COSTA, ISOLDA, EUROPEAN CORROSION CONGRESS: APPLIED SCIENCE WITH CONSTANT AWARENESS
• Tipo de documento: Artigo de conferência
• Título da fonte: Repositório Institucional do IPEN
• Texto Completo: http://repositorio.ipen.br/handle/123456789/29753
• topic: corrosion resistance; corrosion resistant alloys; monitoring; electrochemistry; polarization; aluminium alloys; lithium alloys; spectroscopy; copper alloys

In this work the corrosion resistance of the AA2098-T351 and AA2024-T3 was evaluated and compared by electrochemical tests in 0.01 mol.L-1 of NaCl and 0.1 mol.L-1 of Na2SO4 with 0.001 mol.L-1 NaCl electrolytes. Monitoring of corrosion evolution in both alloys was carried out by electrochemical impedance spectroscopy (EIS) and polarization methods. The surface of the samples exposed to the test solutions was observed by microscopy after corrosion tests. The results showed different corrosion mechanisms in the two test solutions. In the sulfate containing electrolyte, the Al-Cu-Li alloy showed corrosion mechanism mainly associated with the micrometric particles at the surface, similarly to the AA2024-T3 alloy. However, in the chloride solution without sulfate, the AA2098-T351 alloy showed susceptibility to severe localized corrosion (SLC) besides the corrosion associated to the micrometric particles and the first type of corrosion was the main type of attack. The AA2024-T3 showed lower susceptibility to SLC than the AA2098- T351 alloy.