Corrosion resistance based on the microstructural array of an Al-3wt%Cu-1wt%Li alloy
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
The high specific properties of Al-Li alloys have led to tremendous development
effort aimed in particular at aerospace applications. Al-Li castings and cast alloys
that combine the good properties of Al-Li alloys with foundry technology have
great potential in both the aircraft and automotive sectors [1, 2]. In general, the
corrosion behavior strongly depends on the structural morphology and chemical
composition [3]. In this work, anAl-3wt%Cu-1wt%Li alloy was solidified under
upward unsteady state heat flow conditions. Heat was directionally extracted only
through a water-cooled bottom made of steel (SAE 1020). The aim of the present
work is to investigate the influence of the microstructure of this alloy upon
corrosion resistance. Experimental results include secondary dendrite arm
spacings (l2), corrosion potential (ECorr), corrosion rate (iCorr), polarization
resistance (R1) and capacitances values (ZCPE). The corrosion behavior was
analysed by electrochemical impedance spectroscopy technique and Tafel
extrapolation method conducted in a 3% NaCl solution at room temperature.
Coarser dendritic structures tend to improve the corrosion resistance of an
Al-3wt%Cu-1wt%Li alloy.
Como referenciar
ZURLO, MARCIO N.; SANTOS, GIVANILDO A. dos; CINTRA, ELAINE P.; COUTO, ANTONIO A.; OSORIO, WISLEI R.R.; TORRESI, ROBERTO M. Corrosion resistance based on the microstructural array of an Al-3wt%Cu-1wt%Li alloy. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 1019-1020. Disponível em: http://repositorio.ipen.br/handle/123456789/28081. Acesso em: 30 Dec 2025.
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