Effect of Cu content on the corrosion of Al‐Si eutectic alloys in acidic solutions

Abstract

Purpose -The purpose of this paper is to understand corrosion behavior of different Cu-containing Al-Si-x% Cu alloys (x: 1 wt% Cu, 2 wt% Cu, 3 wt% Cu, 4 wt% Cu, and 5 wt% Cu) in 0.1 M HCl and 0.1 M H 2 SO 4 . Design/methodology/approach -Potentiodynamic, chronoamperometric and impedance measurements were applied to specimens to obtain their electrochemical characteristics. For the long-term analyses, hydrogen evolution with immersion time (V-t) was measured. The corroded surfaces of the alloys were investigated using scanning electron microscopy (SEM) to understand the corrosion mechanism. Findings -All experimental investigations showed that the corrosion resistance of alloys increased with increasing Cu content in the alloys. Research limitations/implications -Cu-containing aluminum alloys are age-hardenable alloys. The corrosion behaviour of these alloys can be changed by heat treatment. Corrosion test results for the heat treated and aged alloys will be discussed in another study. Originality/value -Al-Si-Cu alloys are widely used in the automobile industry and the corrosion behaviour of these alloys has a great importance on the service life of these materials. Understanding the effect of copper and the corrosion mechanism of these alloys will be helpful in predicting and prolonging the service life of these materials.

Effect of nickel on microstructure and wear behaviour of pure aluminium against steel and alumina counterfaces

“…1 Among these materials, aluminium alloys have been considered and studied by many researchers. [2][3][4][5][6] Owing to the weak mechanical properties of pure aluminium, many works have been performed to enhance the properties of aluminium by alloying and heat treatment. 7 Through alloying, high mechanical strength can be obtained by the formation of a fine and homogeneous distribution of intermetallic compounds, which must be stable at high temperatures.…”

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

“…Owing to the wide application of aluminum alloys, considerable attention has been devoted to the corrosion behavior of the alloys in various corrosive environments. Zor et al [2] reported that the increase of Cu content increased the volume fraction of θ-phase particles and decreased the corrosion rate of Al-Si eutectic alloy in acidic solution. Barros et al [3] reported that the addition of Mg to the Al-Cu alloy resulted in a lower polarization resistance and higher corrosion current density of the alloy, which accelerated the corrosion of the alloy in 0.5 M NaCl solution.…”

UTILIZAÇÃO DE TÉCNICAS ELETROQUÍMICAS NA INVESTIGAÇÃO DA CORROSÃO DO Al E DA LIGA Al-0,3%Si.

“…Ligas de alumínio podem ser produzidas através da adição de adequados elementos de liga, tais como Cu, Mg, Zn e por adequados procedimentos de tratamento de calor (Zor et al, 2010;Andreatta et al, 2003;Cabot et al, 1995).…”