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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Correlating the Modes of Corrosion with Microstructure in the Friction Stir Welded AA2198-T8 Alloy in Aqueous Hydrogen Peroxide-Chloride Medium

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Autor(es):
Carvalho Machado, Caruline de Souza [1] ; Donatus, Uyime [1] ; Milagre, Mariana X. [1] ; Mogili, Naga V. V. [2] ; Giorjao, Rafael A. R. [2] ; Klumpp, Rafael Emil [1] ; Araujo, Joao Victor de S. [1] ; Ferreira, Raphael Oliveira [3] ; Costa, Isolda [1]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] CNEN, IPEN, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo - Brazil
[2] CNPEM, Brazilian Nanotechnol Natl Lab LNNano, R Giuseppe Maximo Scolfaro 10000, BR-13083970 Campinas, SP - Brazil
[3] Univ Sao Paulo, Dept Engn Mecatron & Sistemas Mecan Poli, Lab Fenomenos Superficie, Av Prof Luciano Gualberto 380, BR-05508010 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: CORROSION; v. 75, n. 6, p. 628-640, JUN 2019.
Citações Web of Science: 2
Resumo

In this study, different types of localized corrosion in the friction stir welding (FSW) zones of an AA2198-T8 when the alloy is subjected to a corrosion test in a hydrogen peroxide-chloride solution (according to ASTM G110 standard) has been investigated. The corrosion modes were correlated with microstructure, especially with respect to the T1 phase and coarse Al-Cu-Fe phase distribution across the weldment. Simulated thermal profile and microhardness measurements were used to establish the variations in T1 phase distribution. Two types of corrosion were observed in the FSW zones: intense pitting and intergranular corrosion-type I; and the formation of cavities and trenches-type II. Type I is associated with the T1 phase while type II is associated with Al-Cu-Fe coarse intermetallics. Both types were found on the base metal (BM) and heat affected zone, but the type I reduced in the latter toward the stir zone (SZ). The SZ/thermo-mechanically affected zone (TMAZ) exhibited only type II. Also, Cu enrichment was observed around the type II sites in the SZ/ TMAZ. Furthermore, an inverse correlation between microhardness and corrosion resistance which was related to T1 phase concentration in the different zones was also observed. Moreover, the SZ and BM were isolated and evaluated by an immersion test and electrochemical analysis using the ASTM G110 test solution. The results indicated galvanic coupling effects, as the SZ was strongly attacked when exposed separately compared to when it was coupled with the other zones. (AU)

Processo FAPESP: 13/13235-6 - Estudo da corrosão localizada e caracterização da resistência à corrosão associada à fadiga na região de solda em ligas de alumínio de elevada resistência soldadas por fricção (FSW)
Beneficiário:Isolda Costa
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 17/03095-3 - Investigação da suscetibilidade à corrosão de ligas Al-Cu-Li com solda por atrito (FSW) utilizando a técnica de varredura do eletrodo vibratório (SVET)
Beneficiário:Uyime Donatus
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado