CORROSION-RESISTANT AMORPHOUS FE-C ALLOYS CONTAINING CHROMIUM AND-OR MOLYBDENUM

An attempt was made to improve corrosion resistance of amorphous iron-base alloys, which contain only carbon as a metalloid element, by the addition of chromium and/or molybdenum. The addition of both metallic elements is effective in decreasing the corrosion rate. Especially, the addition of certain amounts of chromium leads to spontaneous passivation even in 1 N HCl. The corrosion resistance of amorphous FeCrC alloys is intermediate between those of amorphous FeCrPC and FeCrB alloys. The all-amorphous alloys examined are characterized by immunity to pitting corrosion, even by anodic polarization in 1 N HCl. © 1979.