전기도금법을 이용한 나노 산화티타늄 니켈 복합도금에 관한 연구
Electrodeposition of Nano TiO2 Powder Dispersed Nickel Composite Coating
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초록
복합도금이란 금속 도금층을 매트릭스로 세라믹, 폴리머, 나노분말과 같은 입자를 공석시켜 경도의 향상, 내마모성, 내식성, 자기 윤활성 등의 특성을 갖는 복합 금속피막을 얻어내는 방법으로 본 연구에서는 나노입자로 TiO2를 사용하여 니켈과 함께 복합도금층을 형성하였다. TiO2를 첨가시킨 복합전기도금을 통해 표면저항성 향상, 광분해 효과를기대할 수 있다. 용액조건 중 pH 변화에 따른 zeta전위를 측정하였다. 초음파처리를 통한 물리적인 방법으로 용액 중 나노분말의 응집을 최소화한 후 TiO2-Ni 복합도금을 실시하였다. 최적의 도금 조건으로 50oC에서 pH 3.5, 전류밀도 40 mA/cm2에서 가장 효과적이었으며 Ti의 함량은 50oC에서 15-20 at.%로 확인되었다.
Abstract
Composite coating can be manufactured during the electroplating with the bath containing a suspension of particles: ceramic, polymer, nanopowders. Improvement of hardness, wear resistance, corrosion resistance and lubrication properties are well-known advantage of composite coating. In this study, nano TiO2 powder dispersed Ni composite plating was investigated. The improvement of surface hardness and photo decomposition effects can be expected in this coating. Zeta potential was measured with pH. The effect of ultrasonication time and types of ultrasonicator were studied to minimize the agglomeration of TiO2 nanopowders in the electrolyte. Optimum conditions for nano TiO2 dispersed Ni composite coating were 40 mA/cm2 of current density, pH 3.5, and 50oC. At these conditions, TiO2 nanoparticles contents in the Ni deposit was 15-20 at.%.
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