The passive layers formed spontaneously via air contact on the surface of amorphous Fe-62 Cr-10 Ni-8 X(20) (X = Si,P) alloys were studied by X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). The results for Fe-62 Cr-10 Ni-8 Si-20 showed the formation of a protective film, mainly consisting of oxidized chromium, that greatly enhanced the corrosion resistance of this alloy, whereas in Fe-62 Cr-10 Ni-8 P-20 the film was less corrosion resistant. To evaluate the influence of the passive layer composition on the corrosion resistance, standard electrochemical measurements on both alloys in 0.01 M HCl solution were performed. The study reveals that the best corrosion behaviour is given by the Si containing amorphous alloy confirming XPS and AES results.