Find in Library

<p class="PaperAbstract"><span lang="EN-US">The corrosion behavior of heat treated Al-6Si-0.5Mg-xCu (x=0, 0.5 and 1 wt %) alloys in 0.1 M NaCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The potentiodynamic polarization curves reveal that 0.5 wt % Cu and 1 wt % Cu content alloys are less prone to corrosion than the Cu free alloy. The EIS test results also showed that corrosion resistance or charge transfer resistance (</span><em><span lang="EN-US">R</span></em>_{<span lang="EN-US">ct</span>}<span lang="EN-US">) increases with increasing Cu content into <br /> Al-6Si-0.5Mg alloy. Maximum charge transfer resistance (</span><em><span lang="EN-US">R</span></em>_{<span lang="EN-US">ct</span>}<span lang="EN-US">) was obtained with the addition of 1 wt % Cu and minimum </span><em><span lang="EN-US">R</span></em>_{<span lang="EN-US">ct</span>}<span lang="EN-US"> value was for Cu free Al-6Si-0.5Mg alloy. Due to addition of Cu and thermal modification, the magnitude of open circuit potential (OCP), corrosion potential (</span><em><span lang="EN-US">E</span></em>_{<span lang="EN-US">corr</span>}<span lang="EN-US">) and pitting corrosion potential (</span><em><span lang="EN-US">E</span></em>_{<span lang="EN-US">pit</span>}<span lang="EN-US">) of Al-6Si-0.5Mg alloy in NaCl solution were shifted to the more noble direction. </span></p>