Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Atmospheric Corrosion and Surface Appearance of Galvalume Steel following Outdoor Exposure for 36 Months: A Korean Study

36개월간 국내 옥외폭로시험에 따른 갈바륨 강판의 대기부식거동 및 표면외관 변화

  • Kim, K.T. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University) ;
  • Yoo, Y.R. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University) ;
  • Kim, Y.S. (Materials Research Center for Energy and Green Technology, School of Materials Science and Engineering, Andong National University)
  • 김기태 (안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 유영란 (안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 김영식 (안동대학교 신소재공학부 청정에너지소재기술연구센터)
  • Received : 2020.12.15
  • Accepted : 2020.12.22
  • Published : 2020.12.31
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Abstract

Galvalume steel (GL) is widely used in marine and industrial environments. It is characterized by better corrosion resistance than carbon steel. However, corrosion and economic losses may occur as the usage time is increased. Therefore, in this study, an outdoor exposure test of GL for 36 months was conducted across six regions of Korea. Parameters such as corrosion rate, chrominance (color, chroma, and brightness), glossiness, and surface appearance were analyzed. The results showed no significant change in appearance, and the initial corrosion rate was large, but a tendency to decrease with time was observed. Increased outdoor exposure time led to increase in the level of corrosion products. In the case of coastal areas where S, Cl, and other elements were detected, a relatively high decrease in Zn content was observed. Al forms a protective oxide film and exists in the coating layer, but Zn dissolves due to its chemical activity and low potential.

Keywords

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