Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Suggestion of Deterioration Curve for New-type Coating on Atmospheric Environment by Acceleration Corrosion Test

부식촉진 실험을 통한 대기환경에서 신설 도장계의 노화곡선 제안

  • 정영수 (부산대학교 지진방재연구센터) ;
  • 김민정 (부산대학교 토목공학전공) ;
  • 전석현 (경남과학기술대학교 토목공학과) ;
  • 안진희 (경남과학기술대학교 토목공학과) ;
  • 김인태 (부산대학교 건설융합학부 토목공학전공)
  • Received : 2018.11.22
  • Accepted : 2019.01.27
  • Published : 2019.03.01
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Abstract

In this study, to propose the deterioration curves of urethane, ceramic, polysiloxane and fluorocarbon coating for the steel bridge, an accelerated corrosion tests were carried out. The each coating system wes applied on the top of the specimens, and circular initial defects were introduced with different diameters with 0.5, 1.0, 3.0, 5.0 mm. An accelerated corrosion test condition was used to simulate severe corrosive environment depending on ISO 20340. The deterioration curve of each coating type was evaluated based on deteriorated area from the circular defects. In order to evaluate the coating service life of installed steel bridge using deterioration curve, the acceleration coefficient was calculated at correlation between ISO 20340 and corrosivity categories by ISO 9223 based on field corrosion rate. From test results, the propagation rate of coating deterioration area was different to diameter of circular defects. In case of urethane coating, the coating service lifes of 3% deterioration area was evaluated in 31.8, 15.8, 9.9 and 3.9 years with C2, C3, C4 and C5 category.

본 연구에서는 국내에서 사용되고 있는 우레탄계, 세라믹계, 폴리실록산계 및 불소수지계 강교량용 도장계를 대상으로 실내 부식실험을 실시하여 도장계별 노화모델을 도출하였다. 상도를 구분하여 각 도장계별로 시험편을 제작하였으며, 직경 0.5, 1, 3, 5 mm의 원형 결함을 도입하였다. ISO 20340를 이용하여 극한환경을 모사한 부식촉진실험을 실시하였다. 도장계별 노화곡선은 원형결함의 노화면적을 기준으로 평가되었다. 노화곡선을 사용하여 공용중인 강교의 도장 사용수명을 평가하기 위하여 촉진배율을 산출하였으며, 촉진배율은 ISO 20340과 ISO 9223의 대기환경 부식속도를 기준으로 산출되었다. 실험결과, 노화진전속도는 원형결함의 크기와 상관없이 증가하였으며, 노화면적이 3%일 때 우레탄 도장계의 노화수명은 C2, C3, C4 및 C5 등급에서 약 31.8, 15.8, 9.9 및 3.9년으로 평가되었다.

Keywords

References

  1. ASTM B117-1 (2016), Standard Practice for Operating Salt Spray (Fog) Apparatus, ASTM International.
  2. Cheong, H.M., and Lee, C.Y. (2002) Environmentally Friendly Maintenance Coating of Steel Bridge, Final Report, Korea Expressway Corporation Research Institute.
  3. Lee, C. Y. (2010), Present Condition of Steel Bridge Coating in Korean Highway, Magazine of Korean Society of Steel Construction, 22(5), 9-12.
  4. Lee, C. Y., Cheong, H. M., and Kim, O. S. (2004), Construction of Paint Film Diagnosing System for Effective Maintenance of Steel Bridges, Journal of Korea Institute for Structural Maintenance and Inspection, JKSMI, 8(3), 41-51.
  5. Lee, C.Y., Cheong, H.M., and Chang, T.S. (2015) A Study on Application of High Performance Coatings for Service Life Extension of Steel Bridge Coatings, 2015-46-534.9607, Final Report, Korea Expressway Corporation Research Institute.
  6. Lee, C. Y., and Chang, T. S. (2016), Service Life Prediction for Steel Bridge Coatings with Type of Coating Systems, Journal of Korean Society of Steel Construction, 28(5), 325-335. https://doi.org/10.7781/kjoss.2016.28.5.325
  7. Membrane Structures Association of Japan (2012), Evaluation manual of deterioration for member of Membrane Structures, Membrane Structures Association of Japan, Tokyo, 13-14.
  8. Nicolai, R. P., Dekker, R., and Noortwijk, J. M. (2007), A Comparison of Models for Measurable Deterioration: An Application to Coatings on Steel Structures, Reliability Engineering & System Safety, 92(12), 1635-1650. https://doi.org/10.1016/j.ress.2006.09.021
  9. NORSOK M501 (2004), Surface Preparation and Protective Coating, Norsok Standard.
  10. ISO 11507-07 (2007), Paints and Varnishes - Exposure of Coatings to Artificial Weathering, International Organization for Standardization.
  11. ISO 20340-09(2009), Paints and Varnishes - Performance Requirements for Protective Paint Systems for Offshore and Related Structures, International Organization for Standardization.
  12. ISO 9227-17, Corrosion Tests in Artificial Atmospheres - Salt Spray Tests, International Organization for Standardization 2017.
  13. Japan Bridge Association (2006), Painting guidebook for bridge engineers, Japan Bridge Association, Tokyo, 67.
  14. Japan Society of Civil Engineers (2014), Design Methods and Examples for Repair and Rehabilitation of Corrosion Damaged Steel Structures, JSCE, 130-138.
  15. Japan Paint Manufactures Association (2013), Heavy Duty Coating Guide Book, Japan Paint Manufactures Association, Tokyo, pp. 154-168.
  16. KS D9502-09, Method for Salt Spray Test(Neutral Salt, Acetic Acid and Copper Accelerated Acetic Spray Test), Korean Standard 2009.
  17. Kainuma, S. (2017), Current Status and Issues of Corrosion Damage in Steel Highway Bridges, Magazine of Korea Institute for Structural Maintenance and Inspection, KSMI, 18(3), 12-17.
  18. Fujiwara, H., and Miyake, M. (2002), Quantitative Analysis on Deterioration and Remaining Life of Steel Bridge Painting based on Field Data, Journal of Japan Society of Civil Engineers, 696, 111-123.