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PITTING CORROSION STUDIES OF MG-BEARING HYPEREUTECTIC AL-17% SI ALLOY | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 17, Issue 2, 2017, Pages 382-393 | ||
| Authors | ||
| Sawsan Abdul Shaheed Abbas; Khairia Salman Hassan; Muna Khethier Abbass | ||
| Abstract | ||
| In this study pitting corrosion is investigated in hypereutectic Al- 17wt% Si alloy bearing magnesium . Many alloys were prepared by die casting with adding different percentages of magnesium : 1 wt%, 4wt% & 9 wt% to the Al-17%Si alloy in order to study the influence of magnesium addition on the corrosion behavior and pitting properties in 3.5% NaCl solution. Results of microstructure examination show that primary silicon (Si) and eutectic silicon in base alloy was more susceptible to pitting corrosion compared to the other alloys containing magnesium . It was found that the corrosion rate of alloy Al-17%Si bearing Mg (in all percentages) was lower than that of base alloy. The corrosion potential shifts to less negative value ( to more noble direction) and Epit to more positive value with increasing Mg content to 9%wt. It means that the addition of Mg to Al-17% Si alloy improves resistance to pitting corrosion and that no pitting appears in passive region during the cyclic polarization test. | ||
| Keywords | ||
| Si alloy; pitting corrosion; Microstructure; Mg effect | ||
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