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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Techniques for Characterizing Surface Deterioration of Epoxy Exposed to Ozone Damage

오존에 노출된 에폭시 코팅재의 표면 열화특성 평가기술

  • 최성민 (서울과학기술대학교 건설기술연구소)
  • Received : 2014.03.12
  • Accepted : 2014.04.04
  • Published : 2014.05.30
Download PDF
⟨ Previous Next ⟩

Abstract

New technologies for water purification are continuously emerging to address global water quality problems, and one such technology involves advanced hermetic water purification facilities made by concrete that utilize ozone treatment processes. Better knowledge about surface deterioration of epoxy coating exposed to ozone treatment is needed as a foundation for development of improved methods and materials in the future. This study utilized atomic force microscopy (AFM), nanoindentation methods, and existing indirect methods such as visual observation, changes in mass, surface observation and chrominance analysis, to evaluate epoxy water-resistance and anti-corrosiveness. This study considered six different epoxy formulations to assess typical degradation characteristics of epoxy surfaces with regard to water-resistance/anti-corrosiveness. AFM and nanoindentation techniques emerged as promising direct methods with potential to provide quantitative measures of surface quality that are improvements upon existing indirect methods. The experiments also confirmed that some of the epoxy-coatings were severely iMPacted by ozone exposure, and thus the results demonstrate that concern about such deterioration is justified.

최근 수질오염의 악화로 고도정수처리시설에 대한 수요가 커지고 있으며, 오존처리와 같은 밀폐형 고도정수처리시설의 설치가 늘고 있는 실정이다. 그러나 오존의 강력한 산화작용으로 인해 콘크리트 구조물의 침식이 우려됨에 따라 오존에 대응 가능한 에폭시 방수방식재가 콘크리트 표층부 보호 코팅재로 적용되고 있다. 그러나 이러한 에폭시가 오존에 대한 성능수준 및 장기적 내구성을 명확히 측정할 방법과 기준이 없어 정확한 품질관리가 이루어지지 않고 있는 실정이며, 이로 인해 수처리용 콘크리트 구조물의 장기내구성 확보에 대한 우려가 제기되고 있다. 이 연구에서는 AFM과 나노인덴테이션 기법이 기존에 사용하던 평가방법인 육안관찰, 중량변화, 표면관찰, 색차분석 등의 간접적 평가방법과 함께 에폭시 방수방식재 평가방법으로써의 적합한지를 판단하고자 하였으며, 이를 위해 오존용으로 개발된 6종의 다른 성분으로 구성된 에폭시계 방수방식재를 대상으로 열화특성을 분석하였다. 연구결과 AFM과 나노인덴테이션을 활용할 경우 기존 평가방법보다 직접적이고 정량적인 평가가 가능함을 확인하였으며, 일부 에폭시 코팅재료의 경우 오존에 대한 성능 한계치 (임계치)를 명확히 확인할 수 있었다.

Keywords

References

  1. Doerner, M. F., Nix, W. D. (1986), A Method for Interpreting the Data from Depth-Sensing Indentation Instruments, J Mater Res, 1(4), 601-609. https://doi.org/10.1557/JMR.1986.0601
  2. Flores, A., Baltckt Calleja, F. J. (1998), Mechanical Properties of Poly (Ethylene Terephthalate) at the Near Surface from Depth-Sensing Experiments, Philos Mag A, 78(6), 1283-1297. https://doi.org/10.1080/01418619808239987
  3. Gao, F., Qian, Y. (2004), Micromechanical Properties of Heterogeneous Aluminium-Silicon Brazed Joint, Mater Lett, 58(22-23), 2861-2867. https://doi.org/10.1016/j.matlet.2004.04.024
  4. Kim, M. H. (2004), The Present State of Maintenance and Direction of Rehabilitation, Journal of Korea Concrete Institute, KCI, 16(1), 6-9 (in Korean, with English abstract).
  5. Koch, T., Evaristo, M., Pauschitz, A., Roy, M., Cavaleiro, A. (2009), Nanoindentation and Nanoscratch Behaviour of Reactive Sputtered Deposited W-S-C Film, Thin Solid Films, 518(1), 185-93. https://doi.org/10.1016/j.tsf.2009.06.027
  6. Kwak, K. S., Seo, H. J., Miyauchi, H., Kim, G. Y., and Oh, S. K. (2010), A Study on Suggestion of the Evaluation Method of $O_3$ Deterioration of Waterproofing and Corrosion Prevention Materials in Concrete Facility for Advanced Water Treatment Using Ozone ($O_3$) Sterilization, Journal of the Architecture Institute of Korea, AIK, 26(9), 79-86 (in Korean, with English abstract).
  7. Lee, J., Zhang, M. Bhattacharyya, D., and Yuan, Y. C. (2012), Micromechanical Behavior of Self-healing Epoxy and Hardener-Loaded Microcapsules by Nanoindentation, Materials Letters, 76, 62-65. https://doi.org/10.1016/j.matlet.2012.02.052
  8. Office of Waterworks (1997), A Comparative Study on the Test Methods and the Best Suit Construction Methods of Waterproofing and Anti-Corrosion Materials in the Concrete Structure of Water Supply Facilities, Seoul Metropolitan Government, 1-85 (in Korean).
  9. Oh, H. J. (1998), The Development and Application of Advanced Water Treatment Technologies that Best Suits in Korea, Korea Institute of Construction Technology, KICT, 1-99 (In Korean).
  10. Oh, S. K., Kwak, K. S., and Yang, S. D. (2003), A Study on the Surface Deterioration Evaluation of Epoxy Resin Coating as Anticorrosive Material of Concrete Water Tank Using Ozone($O_3$), Journal of the Architecture Institute of Korea, AIK, 19(7), 87-94 (in Korean, with English abstract).
  11. Oliver, W. C., Pharr, G. M. (1992), An Improved Technique for Determining Hardness and Elastic Modulus Using Load and Displacement Sensing Indentation Experiments, J Mater Res, 7, 1564-1583. https://doi.org/10.1557/JMR.1992.1564
  12. Ozone Association of Japan (2008), Ozone Handbook, 71-78.
  13. Park, Y. J., Koo, K. M., Kim, G. Y., Oh, S. K., Seo, H. J., and Miyauchi, H. (2012), A Study on the Performance Evaluation of Anti-Corrosive Material's Surface Quality Changes by the Ozone, Journal of the Architecture Institute of Korea, AIK, 28(3), 83-89 (in Korean, with English abstract).
  14. Ramos, J. A., Blanco, M., Zalakain, I., and Mondragon (2009), Nanoindentation Study of Interphases in Epoxy/Amine Thermosetting Systems Modified with Thermoplastics, Journal of Colloid & Interface Science, 336(2), 431-437. https://doi.org/10.1016/j.jcis.2009.04.068
  15. Shen, L., Wang, L., Liu, T., and He, C. (2006), Nanoindentation and Morphological Studies of Epoxy Nanocomposites, Macromol. Mater. Eng., 291, 1358-1366. https://doi.org/10.1002/mame.200600184
  16. Tehrani, M., Safdari, M., Al-Haik, M. S. (2010), Nanocharacterization of Creep Behavior of Multiwall Carbon Nanotubes/Epoxy Nanocomposite, Int J Plast, 27(6), 887-901.

Cited by

  1. Correlation between Nano-indentation Analysis on Surface Hardness and KS Tensile Strength after Deterioration of Exposed Type Waterproofing Material for Improvement of Evaluation Method vol.32, pp.1, 2016, https://doi.org/10.5659/JAIK_SC.2016.32.1.45
  2. An Experimental Study on Evaluation of Bond Strength of Arc Thermal Metal Spaying According to Treatment Method of Water Facilities Concrete Surface vol.16, pp.2, 2016, https://doi.org/10.5345/JKIBC.2016.16.2.107