Recent progress in the study of protective rust-layer formation on weathering steel
- Himeji Inst. of Tech. (Japan). Dept. of Mechanical Engineering
- Muroran Inst. of Tech. (Japan). Dept. of Materials Science and Engineering
Latest understanding of protective rust layer on weathering steel and its application for structural steels is discussed. Phase transformation of the weathering steel rust layer during long-time exposure brings {alpha}-(Fe{sub 1{minus}x},Cr{sub x})OOH, Cr-substituted goethite, as the final protective rust layer. It is said that the Cr content in the Cr-substituted goethite layer increases gradiently with reaching the rust-steel interface. This increase in the Cr content gives densely packed fine crystal structure end cation selective ability, which impedes the penetration of aggressive corrosives including anions such as Cl{sup {minus}} and SO{sub 4}{sup 2{minus}}. Quite recently, new surface-treatment technique employing Cr{sub 2}(SO{sub 4}){sub 3}, was proposed, which provides a possibility for obtaining the protective rust layer in a relatively short period even in the severe environment such as coastal region.
- OSTI ID:
- 350043
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
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