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

정화랑; 이한승

doi:10.5345/jkibc.2021.21.6.539

플라즈마 아크 용사 공법에 의해 도포된 Zn 및 Zn-15Al 금속 코팅의 해수 환경에서 부식 특성에 관한 실험적 연구
Experimental Study on the Corrosion Characteristics of Zn and Zn-15Al Coatings Deposited by Plasma Arc Thermal Spray Process in Saline Solution 원문보기

한국건축시공학회지 = Journal of the Korea Institute of Building Construction, v.21 no.6, 2021년, pp.539 - 550

정화랑 (Department of Architectural Engineering, Daegu Catholic University) , 이한승 (Department of Architectural Engineering, Hanyang University)

초록
AI-Helper

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.

Abstract ▼ AI-Helper

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.

주제어

표/그림 (13)

그림 Figure 1. Schematic of plasma arc thermal spray coating process
그림 Figure 2. Schematic diagram of potentiostat for electrochemical impedance spectroscopy experiment
표 Table 1. Chemical composition of Carbon steel for substrate(wt.%)
$Figure 3. Digital image of (a) scanning electron microscope(SEM) & (b) X-ray diffraction(XRD) instrument$ 그림 Figure 3. Digital image of (a) scanning electron microscope(SEM) & (b) X-ray diffraction(XRD) instrument
그림 Figure 4. SEM of (a) Zn, and (b) Zn-15Al coating deposited by plasma arc thermal spray process(Mag. 10,000X)
그림 Figure 5. OCP measurements of coatings in 3.5 wt.% NaCl solution with exposure periods
그림 Figure 6. Nyquist plots of coatings after (a) 1h, (b) 15d, and (c) 41d of exposure in 3.5wt.% NaCl solution
그림 Figure 7. Bode plots of coatings after (a) 1h, (b) 15d, and (c) 41d of exposure in 3.5 wt.% NaCl solution
그림 Figure 8. Potentiodynamic polarization of coatings after 41d of exposure in 3.5wt.% NaCl solution
표 Table 2. Electrochemical parameters obtained after fitting of potentiodynamic polarization plots in Tafel regions
그림 Figure 9. SEM of corrosion products formed on (a) Zn and (b) Zn-15Al coatings after 41d of exposure in 3.5wt.% NaCl solution
그림 Figure 10. XRD of corrosion products formed on coatings after 41d of exposure in 3.5wt.% NaCl solution
표 Table 3. EDS analysis of corrosion products formed on coatings after 41d of exposure in 3.5 wt.% NaCl solution

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