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Type: Artigo de periódico
Title: Experimental analysis of corrosion resistance on columnar to equiaxed transition region of as cast structures of Al-Cu alloys
Author: Osorio, WR
Spinelli, JE
Freire, CM
Garcia, A
Abstract: In the present article, in order to investigate the corrosion resistance tendency on both sides of the columnar to equiaxed transition (CET), some samples of Al-Cu alloys (5 and 8 wt-%Cu) were prepared on the columnar and on the equiaxed sides of the casting and subjected to corrosion tests. The corrosion resistance has been analysed by both the electrochemical impedance spectroscopy technique and Tafel extrapolation method conducted in a 3% NaCl solution at room temperature. It was found that both columnar and equiaxed morphologies at the CET region, for each alloy examined, have attained similar experimental electrochemical impedance and polarisation results. The secondary dendrite arm spacings lambda(2) on both columnar and equiaxed sides of the CET region are very similar in any case experimentally examined and the resemblance on the corrosion resistance of columnar and equiaxed structures has been attributed to the similarity of such microstructural parameter. The corrosion resistance has decreased with increasing alloy Cu content. The experimental evidence has indicated that this can be associated with smaller dendritic arm spacings.
Subject: Columnar to equiaxed transition
Dendrite arm spacing
Corrosion resistance
Country: Inglaterra
Editor: Maney Publishing
Citation: Materials Science And Technology. Maney Publishing, v. 24, n. 12, n. 1433, n. 1437, 2008.
Rights: fechado
Identifier DOI: 10.1179/174328406X131028
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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