| Full text | |
| Author(s): |
João Victor de Sousa Araujo
[1]
;
Rejane Maria Pereira da Silva
[2]
;
Mariana Xavier Milagre
[3]
;
Caruline de Souza Carvalho Machado
[4]
;
Isolda Costa
[5]
Total Authors: 5
|
| Affiliation: | [1] Universidade de São Paulo. Instituto de Pesquisas Energéticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil
[2] Universidade de São Paulo. Instituto de Pesquisas Energéticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil
[3] Universidade de São Paulo. Instituto de Pesquisas Energéticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil
[4] Universidade de São Paulo. Instituto de Pesquisas Energéticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil
[5] Universidade de São Paulo. Instituto de Pesquisas Energéticas e Nucleares. Centro de Ciência e Tecnologia de Materiais - Brasil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Química Nova; v. 43, n. 8, p. 1058-1065, 2020-10-16. |
| Abstract | |
Corrosion is still one of the most serious and frequent problems in industries. The phenomena involved in the corrosion mechanism of Al-alloys may be explained by formation of galvanic cells between the metal matrix and heterogeneities, such as precipitates, intermetallic phases leading to potential differences and electrochemical reactions. In the cathodic sites, the main reactions are oxygen reduction reaction, in aerated neutral environments, and hydrogen evolution in acid media. This last type of reaction might also occur in neutral solutions inside pits (anodic region). In this study, the mechanism of hydrogen evolution during corrosion of the 2198-T8 Al-Cu-Li alloy exposed in a chloride solution was investigated. The mechanism was related to the presence of T1 phase (Al2CuLi), which is the main strengthening phase in this material. This phase is highly active and, when exposed to corrosive media, leads to severe localized corrosion (SLC). One of the main characteristics related to SLC is hydrogen gas evolution which was confirmed by gel visualization. In this study, the hydrogen evolution mechanism inside the SLC sites was studied by scanning electrochemical microscopy (SECM). (AU) | |
| 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 |