한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제56권1호
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  • Pages.69-76
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  • 2023
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
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Zn-Al-Mg 합금도금강판의 헤어라인 처리가 표면흑색화 및 열확산도에 미치는 영향

Effects of hairline treatment on surface blackening and thermal diffusion of Zn-Al-Mg alloy-coated steel sheet

  • Jin Sung Park (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Duck Bin Yun (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Sang Heon Kim (M.E.C. Co. LTD. Technical Research Laboratories) ;
  • Tae Yeob Kim (Division of Marine System Engineering, Korea Maritime & Ocean University) ;
  • Sung Jin Kim (Department of Advanced Materials Engineering, Sunchon National University)
  • 투고 : 2023.01.04
  • 심사 : 2023.01.18
  • 발행 : 2023.02.28
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초록

The effects of hairline treatment on surface blackening and thermal diffusion behaviors of Zn-Al-Mg alloy coated steel sheet were evaluated by the three-dimensional surface profiler and laser-flash technique. The metallographic observation of coating damages by hairline treatments showed that several cracks were initiated and propagated along the interface between primary Zn/eutectic phases. As the hairline processing became more severe, the crack occurrence frequency in eutectic phase of coating layer and the surface roughness increased, which had a proportional relationship with the level of blackening on the coating surface. In addition, the higher interfacial areas of the blackened coating surface, caused by the hairline process, led to an increase in thermal diffusivity and conductivity of the coated steel sheet. On the other hand, when the coating damage by hairline treatment was excessive and the steel substrate was exposed, there was little difference between the thermal diffusivity/conductivity of the untreated sample though the blackening degree was higher than that of untreated sample. This work suggests that the increase in the surface areas of the coating layer without exposure to steel substrate through hairline treatment can be one of the effective technical strategies for the development of Zn-Al-Mg alloy coated steel sheets with higher blackening level and thermal diffusivity.

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과제정보

This work was supported by the Technology Innovation Program (20016850, Development of surface blackening technology for high corrosion resistance galvanized alloy coating) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). In addition, this work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C4001255).

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