Polarization and Corrosion of Ferrosilicon Alloys for Iron Ore Beneficiation Media

Abstract

Abstract Ferrosilicon alloys containing from 7.5 to 15 percent silicon and alloying additions of Cr, Ni, Cu, C, U and Mo were subjected to weight loss and polarization tests in NaCl/Na2SO4, HCl and H2SO4 electrolytes. Corrosion resistance was found, in accordance with existing knowledge, to increase with silicon content. Chromium was found to be particularly beneficial as regards corrosion resistance, whereas generally speaking, the other elements had little effect. By the judicious addition of the above-mentioned elements, a 12.5 percent silicon alloy was produced with satisfactory resistance and the high specific gravity necessary for heavy medium separation.