The role of thermal and microstructural parameters on corrosion resistance of unsteady-state horizontally solidified aluminum-copper hypoeutectic alloys
ARTIGO
Inglês
Agradecimentos: The authors gratefully acknowledge the provision of additional funds supplied by Federal Institute of Education, Science and Technology of Pará (IFPA), Federal University of Pará (UFPA), Brazilian Research Council (CNPq - grants 472745/2013-1 and 308784/2014-6), and Coordination of...
Agradecimentos: The authors gratefully acknowledge the provision of additional funds supplied by Federal Institute of Education, Science and Technology of Pará (IFPA), Federal University of Pará (UFPA), Brazilian Research Council (CNPq - grants 472745/2013-1 and 308784/2014-6), and Coordination of Superior Level Staff Improvement (CAPES), Brazil
This article analyzes the effects of Cu content, thermal and microstructural parameters on the mass loss and electrochemical corrosion resistance of two directionally solidified Al-XCu (X= 3wt.% and 6wt.%) hypoeutectic alloys. The investigated solidification parameters include the growth rates (VL),...
This article analyzes the effects of Cu content, thermal and microstructural parameters on the mass loss and electrochemical corrosion resistance of two directionally solidified Al-XCu (X= 3wt.% and 6wt.%) hypoeutectic alloys. The investigated solidification parameters include the growth rates (VL), cooling rates (TR), secondary dendrite arm spacings (. 2) and Al2Cu intermetallic phase. Open circuit potential (EOC), anodic and cathodic polarization curves with the respective corrosion potential and current (ECORR and ICORR) and H-2 release volume evolution (H(2)Vol) corresponding to corrosion kinetics were used to study the corrosion resistance in a 0.2 mol. L-1 solution of HCl with an immersion time of 10 min at 25 degrees C. The corrosion tests were performed at two different positions in relation to cooled interface of the studied alloys. It was found that the corrosion resistance is higher at position closer to the metal-mold interface, in which the VL and TR values are higher and the. 2 value is smaller. The results have shown, for both investigated alloys, that the Al2Cu intermetallic particles are more susceptible to electrolytic corrosion for higher secondary dendrite arm spacings. On the other side, considering a same value for. 2 these particles are less resistant to corrosion in the eutectic matrix of the Al-3wt.% Cu alloy. Thus, the results have indicated that the Al-6wt.% Cu alloy has better electrochemical corrosion resistance than the Al-3wt.% Cu alloy
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
472745/2013-1; 308784/2014-6
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
Aberto
DOI: https://doi.org/10.20964/2017.01.63
Texto completo: http://www.electrochemsci.org/list17.htm
The role of thermal and microstructural parameters on corrosion resistance of unsteady-state horizontally solidified aluminum-copper hypoeutectic alloys
The role of thermal and microstructural parameters on corrosion resistance of unsteady-state horizontally solidified aluminum-copper hypoeutectic alloys
Fontes
International journal of electrochemical science Vol. 12, no. 1 (Jan., 2017), p. 413-428 |