期刊
CORROSION SCIENCE
卷 49, 期 3, 页码 1081-1096出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2006.06.029
关键词
iron; steel; XRD; atmospheric corrosion; rust
Ex-situ X-ray diffraction measurements of a small amount of samples extracted from wet corrosion products freshly formed on a pure iron and iron-2 mass% silicon surfaces have been conducted using synchrotron radiation for clarifying the formation process of corrosion products. The results showed that gamma-FeOOH was formed on the outer side of wet corrosion products formed on the surface of the pure iron by sodium chloride solution, while gamma-FeOOH, alpha-FeOOH, Fe3O4, and green rusts were formed on the inner side. On the other hand, in comparison to the case of the pure iron, a significant formation of beta-FeOOH was observed in the iron-silicon alloy. Influences of silicon alloying on corrosion products formed by aqueous solution containing sulfate ions were also observed. Furthermore, in-situ diffraction measurements by a conventional X-ray source were conducted for analyzing corrosion products formed on the pure iron and iron-silicon alloy surfaces by cyclic exposure to wet and dry atmospheres. The results obtained by the in-situ diffraction and ex-situ diffraction measurements on the corrosion products were consistent. (c) 2006 Elsevier Ltd. All rights reserved.
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