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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2008.1
- 수록면
- 119 - 124 (6page)
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초록· 키워드
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Steel is generally not corrosion resistant to water with formation of non protective rusts on its surface.
Rusts are composed of iron oxides such as Fe₃O₄, α-, β-, γ-and δ-FeOOH. However, steel, particularly
weathering steel containing small amounts of Cu, Ni and Cr etc., shows good corrosion resistance against
rural, industrial or marine environment. Its corrosion rate is exceedingly small as compared with that of
carbon steel. According to the exposure test results undertaken in outdoor environments, the atmospheric
corrosion rate for weathering steel is only 1 mm for a century. Atmospheric corrosion for steels proceeds
under alternate dry and wet conditions. Dry condition is encountered on steel surface on fine or cloudy
days, and wet condition is on rainy or snowy days. The reason why weathering steel shows superior atmospheric
corrosion resistance is due to formation of corrosion protective rusts on its surface under very thin water
layer. The protective rusts are usually composed of two layer rusts; the upper layer is γ-FeOOH termed
as lepidocrocite, and inner layer is nano-particle α-FeOOH termed as goethite. This paper is aimed at
elucidating the atmospheric corrosion mechanism for steel in comparison with corrosion in bulky water
environment by use of empirical data.The summary is as follows:
1. No corrosion protective rusts are formed on steel in bulky water.
2. Atmospheric corrosion for steel is the corrosion under wetting and drying conditions. Corrosion and
passivation occur alternately on steel surface. Steel, particularly weathering steel with small amounts
of alloying elements such as Cu, Ni and Cr etc. enhances forming corrosion protective rusts by passivation.
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참고문헌 (6)
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