ION BACKSCATTERING, CHANNELING AND NUCLEAR-REACTION ANALYSIS STUDY OF PASSIVE FILMS FORMED ON FECRNI AND FECRNIMO (100) SINGLE-CRYSTALS

被引:4
作者
COHEN, C [1 ]
SCHMAUS, D [1 ]
ELBIACHE, A [1 ]
MARCUS, P [1 ]
机构
[1] ECOLE NATL SUPER CHIM PARIS,PHYS CHIM SURFACES LAB,CNRS,F-75005 PARIS,FRANCE
关键词
Backscattering; Channeling; Interfacial Defects; Nuclear Reaction Analysis; Passive Films; Stainless Steels;
D O I
10.1016/0010-938X(90)90109-I
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The compositions of passive films formed on Fe-17Cr-13Ni (at. %) and Fe-18.5Cr-14Ni-1.5Mo (100) single crystals have been determined and the structure of the alloy under the film has been investigated. The alloys were passivated in 0.05M H2SO4 at 250 mV/SHE for 30 min. The oxygen content was measured by nuclear microanalysis using the 160(d,p) 170* reaction. The oxygen content in the passive film is similar for the two alloys and equal to (12±2) 1015 0/cm2. The cationic compositions of the passive films have been determined by 4He channeling at two incident beam energies: 0.8 and 2.0 MeV. For the two studied alloys, a total cation content of (5±2)1015 at/cm2 is found in the passive films. The corresponding thickness is about 12 Å. There is an excess of oxygen, which can be attributed to the presence of hydroxyls and sulfate. A strong chromium enrichment is found in the passive film formed on both alloys: chromium represents about 50% of the cations. There is no evidence of molybdenum enrichment in the passive film formed on the Mo-alloyed stainless steel. The comparison of the results obtained at the two different incident beam energies (0.8MeV and 2MeV) reveals the existence of defects at the alloy/passive film interface. © 1990.
引用
收藏
页码:207 / 212
页数:6
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