Microstructural, Electrochemical and Localized Corrosion Characterization of the AA2198-T851 Alloy

Author(s)

João Victor de Sousa Araujo ^[1] ; Rejane Maria Pereira da Silva ^[2] ; Uyime Donatus ^[3] ; Caruline de Souza Carvalho Machado ^[4] ; Isolda Costa ^[5]

Affiliation

^[1] Instituto de Pesquisas Energeticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil

^[2] Instituto de Pesquisas Energeticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil

^[3] Instituto de Pesquisas Energeticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil

^[4] Instituto de Pesquisas Energeticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil

^[5] Instituto de Pesquisas Energeticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 23, n. 4 2020-09-14.

Abstract

In the present work, the microstructure, electrochemical behavior and localized corrosion of the AA2198-T851 Al-Cu-Li alloy were studied. The microstructure was correlated with corrosion results obtained by immersion, gel visualization and scanning electrochemical microscopy (SECM) tests. Immersion and gel visualization tests showed high kinetics of corrosion attack during the first hours of immersion. SECM analyzes by means of surface generation/tip collection (SG/TC) mode detected hydrogen evolution generated during spontaneous corrosion from severe localized corrosion (SLC) sites on the metal surface. SECM results revealed sites of intense hydrogen evolution after 2 h of immersion and increased amounts of corrosion products after 4 h of immersion. Hydrogen evolution sites detected by SECM were associated with severe localized corrosion (SLC). (AU)

• FAPESP's process: 16/20572-7 - Using localized electrochemical impedance spectroscopy (LEIS) for corrosion of high mechanical strength aluminum alloys welded by FSW
• Grantee: Fernanda Martins Queiroz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/18388-1 - Effect of the microstructure of high strength Al alloys on formation and corrosion resistance of the anodized layer
• Grantee: João Victor de Sousa Araujo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/06880-6 - Use of Localized Electrochemical Techniques for the Study of Corrosion of of High Strength Aluminum Alloys Joined by Friction (FSW).
• Grantee: Rejane Maria Pereira da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral