On the AA2198-T851 alloy microstructure and its correlation with localized corrosion behaviour

Author(s)

Donatus, Uyime ^[1] ; Terada, Maysa ^{[2, 3]} ; Ospina, Carlos Ramirez ^[2] ; Queiroz, Fernanda Martins ^[1] ; Santos Bugarin, Aline Fatima ^[1] ; Costa, Isolda ^[1]

Affiliation

^[1] Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes 2242, Sao Paulo - Brazil

^[2] CNPEM, Lab Nacl Nanotecnol LNNano, Rua Giuseppe MaximoScolfaro 10-000, BR-13083100 Campinas, SP - Brazil

^[3] Univ Sao Paulo, Escola Politecn, Av Prof Mello Moraes 2463, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Corrosion Science; v. 131, p. 300-309, FEB 2018.
• Web of Science Citations: 23

Abstract

The corrosion behaviour of AA2198-T851 alloy has been investigated using a combination of immersion tests and different microscopy techniques. Results showed that severe localized corrosion initiated within 1 h of corrosion immersion test in 0.01 mol L-1 NaCl solution. The corrosion mechanism in this alloy is intragranular and it propagates crystallographically. The propagation occurs through grain orientation dependent bands and it can be likened to the movement of dislocation through slip planes. Corrosion rings around stable pits result from pH variations. Secondary pits form around primary pits within corrosion rings and are preceded by hydrogen evolution. (AU)

• FAPESP's process: 13/13235-6 - Investigation on the localized corrosion and the fatigue corrosion resistance of high strength aluminum alloys joined by friction stir welding (FSW)
• Grantee: Isolda Costa
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/03095-3 - Investigation on corrosion susceptibility of Al-Cu-Li alloys by friction stir welding (FSW) through scanning vibrating electrode technique (SVET)
• Grantee: Uyime Donatus
• Support Opportunities: Scholarships in Brazil - Post-Doctoral