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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.
Air Curtain 에 의한 산소차폐 효과에 관한 연구
이승호,이우일,이준식,차승수,주승기,권제일 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.8
An air curtain was designed and fabricated in order to maintain an oxygen free environment. With a properly designed air curtain, it was possible to maintain the oxygen concentration less than 0.01 under the conditions of 10∼20 ℓ/min air flow. (fluid velocity:6.17∼12.34 ㎝/sec)When the chamber was purged with nitrogen, the lower equilibrium oxygen concentration($lt;0.001% ) than without purging could be obtained. The oxygen concentrations decreases linearly with time at the beginning of air flow in the air curtain. When the oxygen concentration is decreased to less than 1%, the variation of concentration is proportional to (min.)ⁿ. It was found that n is -2 to -3 without Nitrogen purging and is less than -6 with purging.
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.