Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Experimental Study on the Corrosion Characteristics of Zn and Zn-15Al Coatings Deposited by Plasma Arc Thermal Spray Process in Saline Solution

플라즈마 아크 용사 공법에 의해 도포된 Zn 및 Zn-15Al 금속 코팅의 해수 환경에서 부식 특성에 관한 실험적 연구

  • Jeong, Hwa-Rang (Department of Architectural Engineering, Daegu Catholic University) ;
  • Lee, Han-Seung (Department of Architectural Engineering, Hanyang University)
  • Received : 2021.10.12
  • Accepted : 2021.11.26
  • Published : 2021.12.20
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Abstract

In this study, Zn and Zn-15Al were coated on general carbon steel by plasma arc metal spraying and then immersed in a 3.5wt.% NaCl solution similar to the seawater environment to evaluate the corrosion resistance properties. Through the surface shape analysis test by SEM and XRD, it was found that the Zn coating was porous and needle-shaped, so the penetration of the electrolyte was easy, and thus the corrosion rate was rapid. On the other hand, the Zn-15Al coating had a uniform and dense shape and was shown to suppress corrosion.

일반 전기 아크에 의한 금속용사공법에 비해 시공속도와 효율성능이 우수한 플라즈마 아크 용사장비를 개발하여 이 플라즈마 용사장비에 의한 코팅의 부식특성 평가가 요구되었다. 본 연구에서는 일반 탄소강에 Zn 및 Zn-15Al을 플라즈마 아크 금속 용사법으로 코팅한 후 해수 환경과 유사한 3.5wt.% NaCl 용액에 침지하여 내식성을 평가하였다. SEM 및 XRD에 의한 표면 형상 분석 시험 결과, Zn 코팅이 다공성이고 침상 형태로 되어 있어 용액의 침투가 용이하여 부식 속도가 빠른 것을 알 수 있었다. 반면, Zn-15Al 코팅은 균일하고 조밀한 형태를 보여 부식을 억제하는 것으로 나타났다.

Keywords

Acknowledgement

This research was supported by a grant(20S CIP-B146646-03) from Construction Technology Research Project funded by the Ministry of Land, Infrastructure and Transport of Korea government.

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