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Composition and protective ability of rust layer formed on weathering steel exposed to various environments

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Title: Composition and protective ability of rust layer formed on weathering steel exposed to various environments
Authors: Kamimura, T.1 kamimura-tky@sumitomometals.co.jp, Hara, S.2, Miyuki, H.1, Yamashita, M.3, Uchida, H.3
Source: Corrosion Science. Sep2006, Vol. 48 Issue 9, p2799-2812. 14p.
Subjects: Corrosion & anti-corrosives, Steel corrosion, Weathering, Sea salt
Geographic Terms: Japan
Abstract: Abstract: The compositional change of rust (corrosion products) layer formed on weathering steel exposed to atmosphere with different amount of air-borne sea salt particles in Japan have been investigated by the X-ray diffraction method. The mass ratio (α/γ) of crystalline α-FeOOH to γ-FeOOH, in the rust layer formed on the weathering steel exposed in an industrial environment, increases with an increase in exposure duration. The α/γ is closely related to the corrosion rate in environments when the amount of air-borne salt is less than 0.2mg NaCl/dm2/day (2.31×10−7 gNaCl/m2/s). However this is not the case in seaside environments with a higher amount of air-borne salts. The mass ratio (α/γ∗) of crystalline α-FeOOH to the total mass of γ-FeOOH, β-FeOOH and Fe3O4, in the rust layer formed on the weathering steel is related to the corrosion rate even in seaside environments certainly more than 0.2mg/dm2/day (2.31×10−7 g/m2/s) of air-borne salt particles. When the α/γ∗ is more than 1, a higher corrosion rate more than 0.01mm/year (3.17×10−13 m/s) is not observed. The α/γ∗ is a protective ability index of rust formed on weathering steel. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: The compositional change of rust (corrosion products) layer formed on weathering steel exposed to atmosphere with different amount of air-borne sea salt particles in Japan have been investigated by the X-ray diffraction method. The mass ratio (α/γ) of crystalline α-FeOOH to γ-FeOOH, in the rust layer formed on the weathering steel exposed in an industrial environment, increases with an increase in exposure duration. The α/γ is closely related to the corrosion rate in environments when the amount of air-borne salt is less than 0.2mg NaCl/dm2/day (2.31×10−7 gNaCl/m2/s). However this is not the case in seaside environments with a higher amount of air-borne salts. The mass ratio (α/γ∗) of crystalline α-FeOOH to the total mass of γ-FeOOH, β-FeOOH and Fe3O4, in the rust layer formed on the weathering steel is related to the corrosion rate even in seaside environments certainly more than 0.2mg/dm2/day (2.31×10−7 g/m2/s) of air-borne salt particles. When the α/γ∗ is more than 1, a higher corrosion rate more than 0.01mm/year (3.17×10−13 m/s) is not observed. The α/γ∗ is a protective ability index of rust formed on weathering steel. [Copyright &y& Elsevier]
ISSN:0010938X
DOI:10.1016/j.corsci.2005.10.004