Electrochemical parameters of cobalt amorphous alloys in aggressive environments of various nature

The corrosion resistance of contact and outer surfaces of strips of amorphous metal alloys based on cobalt Co72.0Fe5.0Si11.0B12.0, Co73.2Fe4.3Mn0.5Si5.3B16.7, Co73.3(Fe, Ni, Mo, Mn)5.7 (Si0.2B0.8)21 in aqueous solutions of HCl, NaCl and NaOH was investigated. The Co72.0Fe5.0Si11.0B12.0 alloy has the lowest corrosion resistance in all investigated aggressive environments. Partial replacement of Co and Fe by Mn, as well as Ni, Mo slightly increases the corrosion resistance of the material due to the formation of dense oxide layers on the surface.