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 0.2 mg NaCl/dm 2/day (2.31 × 10 −7 g NaCl/m 2/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 Fe 3O 4, in the rust layer formed on the weathering steel is related to the corrosion rate even in seaside environments certainly more than 0.2 mg/dm 2/day (2.31 × 10 −7 g/m 2/s) of air-borne salt particles. When the α/γ ∗ is more than 1, a higher corrosion rate more than 0.01 mm/year (3.17 × 10 −13 m/s) is not observed. The α/γ ∗ is a protective ability index of rust formed on weathering steel.
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