How to Use Composition Ratio Index Obtained by Internal Standard Quantitative X-ray Diffraction Analysis for Evaluation of Rust Status on Weathering Steel

Kihira, Hiroshi; Misawa, Toshihei; Kusunoki, Takashi; Tanabe, Ken-ichi; Saito, Takao

doi:10.3323/jcorr1991.48.727

Cited by 8 publications

(3 citation statements)

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“…This ratio, named the protective ability ratio by Yamashita et al ,8 was first assimilated to the goethite to lepidocrocite ratio, using quantities extracted from X‐ray diffraction (XRD) measurements on rust powders. Other authors9–11 worked to improve its definition, taking into account other phases such as akaganeite (β‐FeOOH) or magnetite (Fe 3 O 4 ). These studies, based on the accurate determination of the quantities of the phases present in the corrosion layers by XRD measurements or on Mössbauer spectroscopy, nevertheless had a limitation.…”

Section: Introductionmentioning

confidence: 99%

A methodology for Raman structural quantification imaging and its application to iron indoor atmospheric corrosion products

Monnier

Bellot‐Gurlet

Baron

et al. 2010

J Raman Spectroscopy

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International audienceRaman structural imaging can extract original information in order to answer new questions raised in the recent studies on iron and low alloy steel corrosion. Up to now, this technique has allowed the extraction of the qualitative distribution of the compounds constituting the corrosion product layers. We propose here a methodology to extract quantitative parameters from Raman hyperspectral maps, executed by a home-developed software: LADIR-CAT. Specifically developed for iron corrosion quantitative component imaging, the approach and program operation are described. The LADIR-CAT is applied on ancient corroded iron samples originating from the Amiens cathedral (France) to establish the description and the composition of the corrosion system through quantitative compound imaging

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Section: Introductionmentioning

confidence: 99%

A methodology for Raman structural quantification imaging and its application to iron indoor atmospheric corrosion products

Monnier

Bellot‐Gurlet

Baron

et al. 2010

J Raman Spectroscopy

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show abstract

“…12,13) Based on this view, the α/γ * ratio was taken from TEM/ED observation. Without counting amorphous rust by TEM/ED to α-FeOOH, the α/γ * ra-tios were 1.51 and 1.15 for E19H-A (skyward) and E19H-B (earthward), respectively, and 0.97 and 0.74 for A19H-A (skyward) and A19H-B(earthward), respectively.…”

Section: Results Of Tem and Ed Analysesmentioning

confidence: 99%

Characterization of Rust Layers on Weathering Steels Air-Exposed for a Long Period

Asami¹,

Kikuchi²

2002

Mater. Trans.

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Several weathering steels and a plain carbon steel exposed to atmosphere for 17 years at Yokkaichi (at a coastal and industrial region) and Mikuni Pass (at a rural region) in Japan were analyzed and compared to find effects of environments on the formed rusts. Specimens were examined with electron probe microanalysis (EPMA), X-ray diffraction (XRD) and transmission electron microscope (TEM). Their crosssections were also analyzed by EPMA. XRD detected mainly α-FeOOH as major rust constituent and β-FeOOH and γ -FeOOH as minor ones in the surface region. The concentration of β-FeOOH was especially high on the skyward surface of all the specimens irrespective of steel composition. EPMA results showed that Si, Na, S were abundant on the skyward surface. In the cross-section, alloying elements Cu and Cr were enriched in the inner layer of rust as well as Si, while P and Ni did not show any characteristic distribution. TEM examination of cross-section of rusts showed that α-FeOOH was also main constituent of the rust. The β-FeOOH showed no special distribution feature in the main part of rust except in the very surface region. Amorphous rust judged from electron diffraction pattern and Fe 3 O 4 distributed mainly near the interface between steel and rust layer. The γ -FeOOH was contained much more in rust on plain carbon steel than weathering steels. A quantity ratio α/γ * , that is, the ratio of α-FeOOH to the sum of β-FeOOH, γ -FeOOH and magnetite, is >1 for a weathering steel, and <1 for a mild steel. The Si in the inner layer was suggested in the form of SiO 4− 4 state. There was almost no difference between specimens exposed at the industrial region and the rural region because of chloride sprayed for melting snow on road during winter at the rural region.

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“…Kihira et al [12] introduced amorphous phases, but stated that they are stable ones. He also defined magnetite as active.…”

Section: Introductionmentioning

confidence: 99%

Study of archaeological artefacts to refine the model of iron long-term indoor atmospheric corrosion

Monnier¹,

Legrand²,

Bellot‐Gurlet³

et al. 2008

Journal of Nuclear Materials

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How to Use Composition Ratio Index Obtained by Internal Standard Quantitative X-ray Diffraction Analysis for Evaluation of Rust Status on Weathering Steel

Cited by 8 publications

References 0 publications

A methodology for Raman structural quantification imaging and its application to iron indoor atmospheric corrosion products

A methodology for Raman structural quantification imaging and its application to iron indoor atmospheric corrosion products

Characterization of Rust Layers on Weathering Steels Air-Exposed for a Long Period

Study of archaeological artefacts to refine the model of iron long-term indoor atmospheric corrosion

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