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졸-겔 방법으로 제조한 SiO2 피막의 아연욕에서의 내구성
차승수,권대원,정홍용 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.5
In order to develop protective coatings on the Fe-based equipments used in a continuous hotdip galvanizing process, sol-gel silica(SiO₂) coatings are formed on steel substrate and their durability in molten zinc has been investigated. The structure of silica coating was glassy and did not change during immersion test. Although many cracks were formed in the coating layers during immersion test, the silica coating was not separated from the substrate and effectively protected steel base from molten zinc attack. It is suggested that such a excellent durability of sol-gel silica coatings in molten zinc is due to the unwettability of silica coatings against molten zinc and high bonding strength between silica coatings and steel. Consequently, it is believed that sol-gel SiO₂ coatings could be used as a protective coating for Fe-based equipments used in a continuous hot-dip galvanizing process.
김재원,차승수,신준영 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.6
The anomalous codepositions for nickel-zinc alloys have been studied to evaluate the fact that the more electronegative zinc than nickel preferentially deposits from the simple salt solution of both metal ions. Experimental results showed that the concentration ratio of nickel and zinc ions and the current densities gave a minor effects for the anomalous codepositions, but the effects of bath temperatures largely acted to convert to normal depositions by depressing the deposition overpotentials, as the temperature approach to boiling point of the solutions.
박주석도금강판의 용접성과 내식성에 미치는 니켈 극박도금의 영향
문원식,박광호,차승수,우치구 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.11
The effects of Ni flash coating on weldability and corrosion resistance of lightly tin coated steel(LTS) have been studied. When Ni layer was coated the prefered orientation of Sn layer was (200) plane. As Sn alloy was formed through reflow or/and stoving process, the structure of Sn alloy with Ni layer was denser than that without Ni layer. The consumption of Sn to Sn alloy was retained when Ni was coated, because the diffusion of Sn was inhibited by dense Fe-Ni-Sn alloy. After reflow and baking process the pure metalic tin remained was enough to have good weldability of LTS. Accelerated salt immersion test, undercutting corrosion test and retort test were performed and we found that Ni-LTS (chromic acid treated) had better lacquer adhesion and better corrosion resistance than tinplate(#25).