Corrosion Behavior of Amorphous Fe-Cr-Ni-(Si,P) Alloys.-The dependence of the corrosion behavior of amorphous Fe62Cr10Ni8X20 ( X: P, Si) alloys in 0.01 M HCl on the composition of the passive film formed in air is studied by XPS, AES, and electrochemical measurements. The high corrosion resistance of the Si-containing alloy is due to formation of a protective film consisting mainly of Cr(III) oxide and oxyhydroxide and some SiO2. The passive film formed on the P-containing alloy which in addition to oxidized Cr(III) also contains Ni and Fe oxides yields a lower corrosion protection. -(LOPEZ, M. F.; ESCUDERO, M. L.; VIDA, E.; PIERNA, A. R.; Electrochim.
Amorphous Fe62CrioNÍ8X2o (X = P, B, Si) alloys in O.OIM HCl solution have been investigated by means of standard electrochemical measurements in order to evalúate their corrosión resistance. The study reveáis that the best corrosión behaviour is given by the Si containing amorphous alloy. X-ray photoelectron spectroscopy (XPS) and Auger electrón spectroscopy (AJES) have been employed to study the composition of the passive layers, formed on the surface of the different amorphous alloys.The results on Fe52CrioNÍ8SÍ2o show that a protective passive film, mainly consisting of oxidized chromium, greatly enhances its corrosión resistance.Keywords: Amorphous alloys. Corrosión. EIS. Photoemission. Passive layer.Estudio del comportamiento frente a la corrosión de las capas pasivas formadas sobre las aleaciones amorfas Fe-Gr-Ni-(Si, P, B)Resumen La resistencia a la corrosión de las aleaciones amorfas Fe62CrioNÍ8X2o (X = P, B, Si) inmersas en HCl 0,01M se evaluó usando técnicas electroquímicas. Las técnicas de espectroscopia de fotoemisión de rayos X y espectroscopia Auger se emplearon para estudiar la composición de las capas pasivas, formadas en aire sobre la superficie de las aleaciones amorfas. Del estudio realizado se concluye que el mejor comportamiento frente a la corrosión viene dado por la aleación amorfa que contiene como metaloide Si. Esto es debido a que la capa pasiva de dicha aleación está formada principalmente de óxido de cromo, lo cual confiere una alta resistencia a la corrosión.Palabras clave: Aleaciones amorfas. Corrosión. EIS. Fotoemisión. Capa pasiva.
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