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钢结构在海洋大气、工业大气中的腐蚀特点

发布时间:2015-9-1 10:05:05 浏览次数:637
大气环境下的钢结构受阳光、风沙、雨雪、霜露及一年四季的温度和湿度变化作用,其中大气中的氧和水分是造成户外钢铁结构腐蚀的重要因素,引起电化学腐蚀。

工业气体含有SO2、CO2、NO2、CI2、H2S及NH3等,这些成份虽然含量很小,但对钢铁的腐蚀危害都是不可忽视的,其中SO2影响最大,CI2可使金属表面钝化膜遭到破坏。这些气体溶于水中呈酸性,形成酸雨,腐蚀金属设施。

海洋大气的特点是含有大量的盐,主要是NaCI,盐颗粒沉降在金属表面上,由于它具有吸潮性及增大表面液膜的导电作用同时CI-本身又具有很强的侵蚀性,因而加重了金属表面的腐蚀。钢结构离海岸越近腐蚀也越严重,其腐蚀速度双内陆大气中高出许多倍。


Atmospheric environment of the steel structure from the sun, wind, rain and snow, frost and dew, and the function of temperature and humidity change by all the year round, including atmospheric oxygen and water is an important factor of outdoor steel structure corrosion, electrochemical corrosion.

Industrial gases containing SO2, NO2, CI2, H2S, CO2 and NH3, although these ingredient content is very small, but the steel corrosion harm is not to be ignored, which had the greatest influence of SO2, CI2 can make the metal surface passivation film is destroyed. The acidic gases dissolve in water, acid rain formation, corrosion of metal facilities.

The characteristics of the Marine atmosphere is contains a lot of salt, mainly NaCI, salt particles falling on metal surface, due to its moisture absorption and increase the conductive effect of the liquid film and the CI - itself and has a strong corrosive, and thus increase the corrosion of the metal surface. Steel structure near the coast, the corrosion is more serious, its corrosion speed double inland is many times higher than that of the atmosphere.




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