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http://dx.doi.org/10.14773/cst.2018.17.6.301

Surface Appearance of Galvanized Steel with Outdoor Exposure Testing 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.6, 2018 , pp. 301-309 More about this Journal
Abstract
If galvanized steel is exposed to an outdoor environment, atmospheric corrosion will occur with time and red rust will form when the sacrificial protection capacity of zinc reaches its limit. With corrosion, the surface appearance of steel changes, and the properties of the exterior materials degrade. In this study, two kinds of galvanized steel, (GA and GI specimens) were subjected to an outdoor exposure test for 36 months in six regions of Korea. Chrominance (color, chroma, and brightness) and glossiness surface analyses were performed. The color change was not significant, regardless of the exposed area or the specimens tested. With increasing exposure times, the GA specimen became blackened by the formation of zinc oxide, and red coloration was increased by the formation of red rust. As the exposure time of GI specimen increased, the surface proceeded to blacken, but no red rust was formed and the color did not change significantly. Regardless of the outdoor exposure area or the specimen, longer exposure times led to lower glossiness, and this behavior appears to be influenced by the formation of zinc oxide.
Keywords
Galvanized steel; Outdoor exposure test; Atmospheric corrosion; Chrominance; Glossiness;
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