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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.694-703

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.694 - 703 Next article>>

Mössbauer Spectroscopic Study of Rust Formed on a Weathering Steel and a Mild Steel Exposed for a Long Term in an Industrial Environment

Takayuki Kamimura1), Saburo Nasu2), Takashi Tazaki2), Kaori Kuzushita2) and Shotaro Morimoto2)
1) Corporate Research and Development Laboratories, Sumitomo Metal Industries, Ltd.
2) Division of Materials Physics, Department of Physical Science,Graduate School of Engineering Science, Osaka University


The rusts formed on mild steel (15-year exposure) and weathering steel (32-year exposure) exposed to an industrial environment have been characterized by means of X-ray diffraction technique and 57Fe Mössbauer spectroscopy. By using an X-ray diffraction method, it is suggested that the rusts formed on both steels consist of the crystalline α-FeOOH, γ-FeOOH and an X-ray amorphous phase, which gives no peak to X-ray diffraction pattern. The amount of the X-ray amorphous phase exceeds 50% of the total amount of the rust. The 57Fe Mössbauer spectra observed at 10 K indicate that the rust contains only α-FeOOH, γ-FeOOH and Fe3−δO4 (γ-Fe2O3) for mild steel, and only α-FeOOH and γ-FeOOH for weathering steel. The X-ray amorphous substance in the rust layer formed on mild steel possesses the structures of mainly α-FeOOH showing superparamagnetism owing to its small particle size, and Fe3−δO4 (γ-Fe2O3). They are contained both in the inner rust layer and in the outer rust layer. The X-ray amorphous phase in the rust layer formed on weathering steel is mainly α-FeOOH.


Keyword:
weathering steel, mild steel, rust, goethite, lepidocrocite, iron oxyhydroxide, FeOOH, magnetite, maghemite, Mössbauer spectroscopy

Received: November 16, 2001
Accepted: February 19, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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