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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.56  No.11 (2007)  >  pp.1035-1041

Journal of the Society of Materials Science, Japan
<<Previous article Vol.56  No.11 (2007)   pp.1035 - 1041 Next article>>

Investigation of Rust Layer Formed on Weathering Steel Coated with a Surface Treatment Promoting Protective Rust Formation

Takayuki KAMIMURA1), Takashi DOI1), Kazuyuki KASHIMA1), Norio WAGURE1), Shuichi HARA2), Katsuya NAKAHARA3), Ryuichi ANDO4) and Hideaki MIYUKI1)
1) Corporate R & D Labs. Sumitomo Metal Industries, Ltd.
2) Investigation & Res. Div., Sumitomo Metal Tech. Inc.
3) Eng. Company, Sumitomo Metal Industries, Ltd.
4) Steel Sheet, Plate, Titanium & Structural Steel Company, Sumitomo Metal Industries, Ltd.


The rust layer formed on the weathering steels coated with a surface treatment promoting protective rust formation exposed at a coastal region containing 0.4mg/dm2/day of air-borne salt particles for 9 years has been investigated by means of X-ray diffraction, Raman spectroscopy, Electron probe micro-analysis and Mössbauer spectroscopy. In the surface treatment, Cr2(SO4)3 is contained to form the protective rust layer. Corrosion loss vs. time curve of surface treated weathering steels follows Y = AXB type function, where X is the exposure duration, Y is the corrosion loss, A and B are the constants. The surface of the treated weathering steels were covered with triple layers ; outer rust layer, surface treatment film and inner rust layer. The outer rust layer consisted of mainly β-FeOOH, and the inner one mainly α-FeOOH. Cr enrichment was observed in the inner rust layer. It can be said that the surface treatment works well to promote the formation of Cr-containing α-FeOOH layer formed on weathering steel.


Keyword:
Weathering steel, Surface treatment, Air-borne salt, Rust layer, α-FeOOH, X-ray diffraction, Raman spectroscopy, Mössbauer spectroscopy

Received: February 23, 2007
Published online: November 22, 2007
Copyright (c) 2007 by The Society of Materials Science, Japan

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