低炭素鋼の大気腐食
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概要
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We have examined the atmospheric corrosion of SPH440, SPH370 and NTR340 low carbon steels under the conditions of relative humidity of 60～90% and at 25～40℃. When these specimens of low carbon steels were left for 2 days in the atmosphere of high humidity of 90%, red rusts were observed irrespective of temperature. And, in the atmosphere of low humidity of 60%, red rusts were not observed irrespective of temperature. From critical humidity for the atmospheric corrosion, the relation between the absolute humidity and temperature was obtained for three kinds of low carbon steel specimens. The relation was shown by an Arrhenius equation for each specimen, and the activation energy was obtained.
- 2011-08-01
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