Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Experimental Evaluation of Weathering Performance for Duplex Coating Systems Combining Thermal Spraying Metals and Painting

금속용사와 도장의 복합피복방식법에 대한 실험적 내후성능평가

  • Kim, In Tae (Dept. of Civil Engineering, Pusan National University) ;
  • Jun, Je Hyong (Dept. of Civil Engineering, Pusan National University) ;
  • Cha, Ki Hyuk (Bridge Manage Division, Busan Infrastructure Corporation) ;
  • Jeong, Young Soo (Dept. of Civil Engineering, Kyushu University) ;
  • Ahn, Jin Hee (Dept. of Civil Engineering, Gyeongnam National University of Science and Technology)
  • 김인태 (부산대학교, 건설융합학부 토목공학전공) ;
  • 전제형 (부산대학교, 사회환경시스템공학부) ;
  • 차기혁 (부산시설공단, 교량시설팀) ;
  • 정영수 (큐슈대학교, 토목공학과) ;
  • 안진희 (경남과학기술대학교, 토목공학과)
  • Received : 2016.07.29
  • Accepted : 2016.09.05
  • Published : 2016.10.27
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Abstract

Painting or thermally sprayed metal coating is often used in corrosion protection of steel structures. In recently, duplex coating system which combines thermally sprayed metals with paint is selected as a new generic type of coatings on steel structures under the highly corrosive environments. In this study, the structural steel specimens were surface treated, thermally sprayed with zinc, zinc-15%aluminum alloy, aluminum and aluminum-5%magnesium alloy, and finally sealing or painted with acrylic urethane. And as a reference specimens, steel specimens were painted with acrylic urethane after surface treatment. Circular defects with 1.0, 3.0 and 5.0 mm in diameters and line defect with 2.0 mm width, which reach the steel substrate were created on all specimens. The specimens were exposed into an environmental testing chamber controlled by the ISO 20340, which is a laboratory cyclic accelerated exposure test condition of spraying/UV/low temperature, for up to 175 days. Based on the corrosion tests, corrosion deterioration from the initial defects were evaluated and weathering performance of the specimens are compared.

도장 또는 금속용사는 강구조물의 방식에 널리 사용되고 있으며, 금속용사와 도장의 복합방식법은 혹독한 부식환경하에 놓인 강구조물에 고내후성 피복방식법으로 적용되고 있다. 본 연구에서는 아연(Zn), 아연-알루미늄(ZnAl)합금, 알루미늄(Al), 알루미늄-마그네슘(AlMg)합금의 4종류 금속용사 후 실링 처리한 시편, 4종류 금속용사 후 중방식 도장한 시편과 도장만 실시한 시편을 대상으로 175일간의 ISO 20340 부식촉진실험을 실시하여, 각 방식법의 상대적인 내후성능을 비교, 검토하였다. 강재표면까지 도달하는 원형 및 선형 초기결함으로부터의 표면상태 변화 및 도막의 노화면적에 근거한 내후성능의 평가 결과, 금속용사 후 실링 처리한 시편의 경우에는 알루미늄(Al) 및 알루미늄-마그네슘(AlMg)금속용사 후 실링 처리한 시편이 가장 우수한 내후성능을 보였으며, 금속용사 후 도장을 실시한 금속용사와 도장의 복합방식법의 경우에는 아연(Zn)용사에 도장을 실시한 복합방식 시편이 가장 우수한 내후성능을 나타내었다.

Keywords

References

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  1. Evaluation of Corrosion Damage of Structural Steel Depending on Atmospheric Exposure Test vol.31, pp.4, 2016, https://doi.org/10.7781/kjoss.2019.31.4.245