36개월간 국내 옥외폭로시험에 따른 아연도강의 표면외관 변화

Abstract

If galvanized steel is exposed to an outdoor environment, atmospheric corrosion will occur with time andred rust will form when the sacrificial protection capacity of zinc reaches its limit. With corrosion, thesurface 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 36months in six regions of Korea. Chrominance (color, chroma, and brightness) and glossiness surface analyseswere performed. The color change was not significant, regardless of the exposed area or the specimenstested. 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.