IMAM   24519
INSTITUTO DE MATERIALES DE MISIONES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electrochemical Behavior of Al-1wt.%Cu and Al-4.5wt.%Cu Alloys
Autor/es:
ROMAN ALEJANDRA; MENDEZ CLAUDIA; SCHVEZOV CARLOS; ARES ALICIA
Lugar:
San Diego, CA
Reunión:
Simposio; SHAPE CASTING: 5TH INTERNATIONAL SYMPOSIUM; 2014
Institución organizadora:
THE MINERALS, METALS AND MATERIALS SOCIETY
Resumen:
The objective of this work was to study the corrosion behavior of dendritic diluted Al-Cu alloys, i.e., Al-1wt.%Cu and Al-4.5wt.%Cu (weight percent), directionally solidified vertically upward. During the solidification of the alloys, the phenomenon of columnar-to-equiaxed transition (CET) was obtained, and then, the properties are assessed according to the type of structure (columnar, equiaxed or CET) and composition. To determine the susceptibility to corrosion, working electrodes were prepared with different types of structures and cyclic potentiodynamic polarization measurements were conducted, as well as assays, electrochemical impedance spectroscopy (EIS) using solution of 3% NaCl at room temperature. It was observed that increasing the percentage of copper in the alloy, the corrosion potential moves to more anodic values. Impedance diagrams of the corrosion potential were obtained and then through a simulated equivalent circuit model. It is further noted that the resistance values decrease with increasing copper content in the alloys