Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Ultrasonic Cavitation Behavior and its Degradation Mechanism of Epoxy Coatings in 3.5 % NaCl at 15 ℃

  • Jang, I.J. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Jeon, J.M. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Kim, K.T. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Yoo, Y.R. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Kim, Y.S. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
  • Received : 2021.02.09
  • Accepted : 2021.02.24
  • Published : 2021.02.26
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Abstract

Pipes operating in the seawater environment faces cavitation degradation and corrosion of the metallic component, as well as a negative synergistic effect. Cavitation degradation shows the mechanism by which materials deteriorate by causing rapid change of pressure or high-frequency vibration in the solution, and introducing the formation and explosion of bubbles. In order to rate the cavitation resistance of materials, constant conditions have been used. However, while a dynamic cavitation condition can be generated in a real system, there has been little reported on the effect of ultrasonic amplitude on the cavitation resistance and mechanism of composites. In this work, 3 kinds of epoxy coatings were used, and the cavitation resistance of the epoxy coatings was evaluated in 3.5% NaCl at 15 ℃ using an indirect ultrasonic cavitation method. Eleven kinds of mechanical properties were obtained, namely compressive strength, flexural strength and modulus, tensile strength and elongation, Shore D hardness, water absorptivity, impact test, wear test for coating only and pull-off strength for epoxy coating/carbon steel or epoxy coating/rubber/carbon steel. The cavitation erosion mechanism of epoxy coatings was discussed on the basis of the mechanical properties and the effect of ultrasonic amplitude on the degradation of coatings.

Keywords

Acknowledgement

This work was supported by the KOREA HYDRO & NUCLEAR POWER CO., LTD (No. 2019-Technical-08).

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