STUDY, BY MEANS OF RADIOINDICATORS, OF THE IMPURITY ENRICHMENT DURING THE OXIDATION OF STEELS (in French)
The extreme generality of the phenomenon of enrichment in the region near the metal-oxide interface during oxidation was confirmed for binary and ternary ferrous alloys where the alloying element is in very small quantities and can be considered as the principal impurity. This effect is found both for metallic elements (copper, chromium, cobalt, molybdenum, and tungsten) and for metalloid elements (sulfur, phosphorus, and arsenic); only manganese is the exception and is dissolved in the iron oxides. However, even if it is admitted that the oxidation of a steel causes the alloying elements and the impurities to be driven toward the metal-oxide interface, the chemical combination of these impurities can not be distinguished. The effect of sulfur on the oxidation in air or in hydrogen or water vapor atmospheres was studied on iron- sulfur alloys with low sulfur concentrations. It was shown that the enrichment at the metal- oxide interface, in the form of iron sulfide, depends on the quantity of oxided iron. These results seem to exclude the possibility of desulfuration of iron across a compact and continuous oxide layer. A mechanism can be outlined when the first linear stage of oxidation is interpreted by an interfacial reaction limited by the chemical absorption of oxygen on the oxide. (tr-auth)
- Research Organization:
- IRSID, Saint-Germain-en-Laye, France
- NSA Number:
- NSA-15-015985
- OSTI ID:
- 4033427
- Journal Information:
- Mem. sci. rev. met., Vol. Vol: 57; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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