THE EFFECT OF CONCENTRATION OF MANGANESE ON THE CORROSION SUSCEPTIBILITY OF Al-Si-Fe-Mn ALLOY SYSTEM IN HCl SOLUTION
Publication Date : 01/08/2007
An investigation on the effect of Manganese contents on the corrosion susceptibility of As-cast and Age-hardened Aluminium-Silicon-Iron-Manganese (Al-Si-Fe-Mn) alloy system in hydrochloric acid (HCl) solution at room temperature (280C) was carried out using weight loss method of analysis. The alloys containing 0.1, 0.2, 0.3, 0.4, 0.5% Mn and control were produced and sand cast into cylindrical test bars then age-hardened. The as-cast and age-hardened samples were machined to corrosion test coupons and immersed into 0.5M HCl solution for 20 days. The results of the corrosion test revealed that the corrosion rate decreases as the percentage addition of Manganese increased for both conditions (as-cast and age-hardened) with the age-hardened alloys exhibiting better corrosion resistance throughout the exposure time. This may be attributed to the formation of intermetallic compounds.
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