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首页> 外文期刊>Corrosion science >Composition and protective ability of rust layer formed on weathering steel exposed to various environments
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Composition and protective ability of rust layer formed on weathering steel exposed to various environments

机译：暴露在各种环境下的耐候钢上形成的防锈层的组成和防护能力

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摘要

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 x l0~(-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 x 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 x 10~(-13)m/s) is not observed. The α/γ~* is a protective ability index of rust formed on weathering steel.
机译：通过X射线衍射法研究了在日本暴露于大气中的空气中含有不同量的海盐颗粒的耐候钢上形成的锈（腐蚀产物）层的组成变化。在暴露于工业环境中的耐候钢上形成的锈层中，结晶α-FeO​​OH与γ-FeOOH的质量比（α/γ）随着暴露时间的增加而增加。当气载盐的量小于0.2 mg NaCl / dm〜2 / day（2.31 x l0〜（-7）g NaCl / m〜2 / s时，环境中的腐蚀速率与α/γ密切相关。 ）。但是，在空气中盐分含量较高的海边环境中情况并非如此。即使在海边环境中，在耐候钢上形成的锈层中，结晶α-FeO​​OH与γ-FeOOH，β-FeOOH和Fe_3O_4的总质量的质量比（α/γ〜*）也与腐蚀速率有关。空气中的盐粒子超过0.2 mg / dm〜2 /天（2.31 x 10〜（-7）g / m〜2 / s）。当α/γ〜*大于1时，未观察到高于0.01毫米/年（3.17 x 10〜（-13）m / s）的更高腐蚀速率。 α/γ〜*是耐候钢上形成的锈的保护能力指标。

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