The filtering medium properties of electro-less plated metallic glasses

Magnetic filtering media used in chemical solutions are required to have excellent soft magnetic properties, large specific surface areas, and adequate corrosion resistance. As a filtering medium, the metallic glasses (commercial alloys 2605SC, 2826MB and 2605Co) in melt quenched state and in electro-less plated states have been investigated to determine the filtering performance for micron or sub-micron-sized ferromagnetic particles from alkaline solutions. Soft magnetic properties and corrosion resistance (in corrosion rate in alkaline solution) of the filters, made of laboratory-fabricated metallic glasses (FeNiCrPC alloys) and commercial alloys, were examined and compared in a filtering environment. The electro-less Ni–P plated 2605SC metallic glass was demonstrated optimum filtering medium properties that could be used in contaminated alkaline solutions with ferromagnetic particles or their compounds. The Ni–P plating was most effective in improving the corrosion resistance with the highest retention of soft magnetic properties among the metallic glass tested.