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Effect of the Fe/Cu Relationship Corrosion and low Alloying Elements on Corrosion Behavior of Cast Aluminum Parts

Published online by Cambridge University Press:  29 November 2016

C. Rodríguez-Rivera
Affiliation:
Depto. de Metalurgia, Edificio “D”, Facultad de Química, UNAM, Ciudad Universitaria, D.F., C.P. 04510, México, D.F.
J.A. García-Hinojosa
Affiliation:
Depto. de Metalurgia, Edificio “D”, Facultad de Química, UNAM, Ciudad Universitaria, D.F., C.P. 04510, México, D.F.
F.J. Rodríguez-Gómez
Affiliation:
Depto. de Metalurgia, Edificio “D”, Facultad de Química, UNAM, Ciudad Universitaria, D.F., C.P. 04510, México, D.F.
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Abstract

The aim of this study is to compare the corrosion rate of aluminum alloys for ornamental pieces. Three Fe/Cu relationships were tested in order to improve hardness and brightness in aluminum pieces since these alloys are used in the making of ornamental pieces. The variation on Fe/Cu content could result in modification on corrosion rate, since a metallographic characterization must be carried out identifying the presence of intermetallic phases. The presence of these elements could result in increasing corrosion rate, or even in modification of corrosion morphology, so localized corrosion could be expected.

The assessment of corrosion rate was carried out in saline media, since chlorides are ions that promote localized corrosion. Electrochemical techniques (polarization curves and Tafel plots) were used in order to evaluate the attack in aluminum pieces; electrochemical impedance spectroscopy was also employed with voltage amplitude of 10 mV rms, and a frequency range from 10,000 Hz to 0.01 Hz. A typical three electrodes cell was used, exposing an area of one cm2. Before polarization, open circuit potential was monitored for an hour looking for a steady state. All conditions were tested for triplicate.

The behavior of open circuit potential vs. time, and polarization curves was analyzed; a corrosion mechanism is proposed according to the electrochemical control. Polarization rate was calculated by using Tafel plots and, an electrochemical impedance spectroscopy analysis by using equivalent electric circuits is shown. Electrochemical impedance will yield information about corrosion morphology that is backed with microscopic inspection.

The objective of this study is to compare the corrosion rate of aluminum alloys for ornamental pieces in order to determine the effect of the relationship Fe/Cu on the corrosion mechanism in aluminum parts for ornamental pieces.

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Articles
Copyright
Copyright © Materials Research Society 2016 

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References

Genescá, J., Ávila, J., Rodríguez, P. y López, W., “Tres métodos para evaluar una velocidad de corrosión”. Revista Ingeniería Hidráulica, México, abril 1991.
Genescá, J. y Ávila, J., “Más allá de la Herrumbre I”. Fondo de Cultura Económica, México, 1985.
Mansfield, F., “The polarization resistance technique for measuring corrosion currents” In Advances in Corrosion Science and Technology. Volume 6, M. G.
Fontana and Satchels, R. W., 1976, USA.
ASTM Standards G59-91. “Standard Practice for conducting Potentiodynamic
Polarization Resistance Measurements”, Annual Book of ASTM Standards, volume 03.02 Wear and erosion; Metal Corrosion, 2004.
Rojas Díaz, J. L., “Efecto de la relación Fe/Cu y bajos contenidos de Ni en la dureza y abrillantado de piezas de aluminio coladas en moldes de arena en verde”, TESIS UNAM, 2012.

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Effect of the Fe/Cu Relationship Corrosion and low Alloying Elements on Corrosion Behavior of Cast Aluminum Parts
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