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http://dx.doi.org/10.14773/cst.2018.17.5.231

Corrosion Behavior of Galvanized Steels with Outdoor Exposure Test in Korea for 36 Months  

Kim, K.T. (Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
Kim, Y.S. (Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
Publication Information
Corrosion Science and Technology / v.17, no.5, 2018 , pp. 231-241 More about this Journal
Abstract
Atmospheric corrosion is generally an electrochemical degradation process of metal. It can be caused by various corrosion factors of atmospheric component, weather, and air pollutants. Moisture, particles of sea salts, and sulfur dioxide are major factors in atmospheric corrosion. Galvanizing coating is one of the most efficient ways to protect iron from corrosion by zinc plating on the surface of the iron. Galvanized steels are being widely used in automobiles, building structures, roofing, and other industrial structures due to their high corrosion resistance compared to bare iron. Atmospheric corrosion of galvanized steel has shown complex corrosion behavior depending on coating process, coating thickness, atmospheric environment, and air pollutants. In addition, different types and kinds of corrosion products can be produced depending on the environment. Lifespan of galvanized steels is also affected by the environment. Therefore, the objective of this study was to determine the corrosion behavior of galvanized steel under atmospheric corrosion at six locations in Korea. When the exposure time was increased, content of zinc from GA surface decreased while contents of iron and oxygen tended to increase. On the other hand, content of iron was constant even after 36 months of exposure of GI.
Keywords
Galvanized steel; Outdoor exposure test; Atmospheric corrosion; Surface appearance;
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