CORROSION RESISTIVITY OF AMORPHOUS IRON ALLOYS CONTAINING CHROMIUM.

Abstract

In a 1 N NaCl solution at 30 degree C, 0. 01-1 N HCl solutions at 30 degree C and in 10% FeCl//3. 6 H//2O solutions at 40 and 60 degree C, pitting corrosion did not occur on the amorphous Fe-Cr-P-C and Fe-Cr-Ni-P-C alloys and the weight change of the alloys containing 8 at% or more Cr was not detected by a microbalance after immersing for 168 hr. The extremely high corrosion resistivity of the amorphous iron alloys is attributed to the peculiar film formation partly by the presence of Cr and a large quantity of P in the alloys and partly by a single phase of the amorphous state.