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On the Global and Localised Corrosion Behaviour of the AA2524-T3 Aluminium Alloy Used as Aircraft Fuselage Skin

Authors
  • Moreto, Jéferson Aparecido
  • Rossino, Luciana Sgarbi
  • Bose Filho, Waldek Wladimir
  • Marino, Cláudia Eliana Bruno
  • Ferreira, Miguel da Conceição
  • Taryba, Maryna
  • Fernandes, João Carlos Salvador
Publication Date
Jan 01, 2019
Source
Scientific Electronic Library Online - Brazil
Keywords
Language
English
License
Unknown
External links

Abstract

The aim of this work was to study the corrosion process of new aluminium alloy AA2524-T3 (Solution Heat Treated and Cold Worked), which is a promising substitute of the base line AA2024-T3 for aircrafts fabrication, by global and localised techniques in sodium chloride medium (0.05 mol L-1 NaCl). The open circuit potential results revealed a stochastic evolution of pitting events and to the resulting variations in the ratio of passive/active areas and/or cathode/anode, which may be related to the presence of different types of intermetallics. The cyclicvoltammetry showed that the corrosion potential (Ecorr) and the pit nucleation potential (E pit) values are quite similar (approximately -0.525 V). The results of EIS show that the corrosion rate is quite stable, with no tendency to increase or decrease for longer immersion periods. The results of SVET were in agreement with the results obtained by EIS technique, showing strong anodic activity on the surface with no repassivation along the whole immersion time. Besides, corrosion process led to significant surface degradation after 24h.

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