pH, duty cycle, 교반, 첨가제가 Ni-TiO2 전기도금 복합체의 TiO2 공석특성과 열적안정성에 미치는 영향 연구
A Study of pH, Duty Cycle, Agitation on the Property of Co-deposited TiO2 and Thermal Stability in the Electrodeposited Ni-TiO2 Composite
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The effects of pH, types of applied current, agitation method and time, additive on the amount of codeposited TiO2 particles in the matrix were investigated. The deposition rates increased with increasing pH values, while the volume fraction of TiO2 particles and the size of agglomerated TiO2 particles in the composite decreased. The volume fraction of TiO2 particles in the composite decreased when pulsed current of 50%duty cycle was used. And the size of agglomerated TiO2 particles in the nickel matrix of pulsed current was smaller than that of DC current specimen. The volume fraction of TiO2 particles in the matrix decreased with longer time by air agitation, but in case of using magnetic bar, volume fraction in the same range of time was relatively constant. The volume fraction of the electrodeposited Ni-TiO2 composite in the solution containing 0.01 M Dimethylamine borane (DMAB) increased slightly with increasing agitation time regardless of agitation methods. Thermal stability of the electrodeposited Ni-TiO2 composite increased with lower pH at the temperature range of 200~800oC, and the results showed that the amount of co-deposited TiO2 relies more on the deposition rate than zetapotential of TiO2 particles
Abstract
The effects of pH, types of applied current, agitation method and time, additive on the amount of codeposited TiO2 particles in the matrix were investigated. The deposition rates increased with increasing pH values, while the volume fraction of TiO2 particles and the size of agglomerated TiO2 particles in the composite decreased. The volume fraction of TiO2 particles in the composite decreased when pulsed current of 50%duty cycle was used. And the size of agglomerated TiO2 particles in the nickel matrix of pulsed current was smaller than that of DC current specimen. The volume fraction of TiO2 particles in the matrix decreased with longer time by air agitation, but in case of using magnetic bar, volume fraction in the same range of time was relatively constant. The volume fraction of the electrodeposited Ni-TiO2 composite in the solution containing 0.01 M Dimethylamine borane (DMAB) increased slightly with increasing agitation time regardless of agitation methods. Thermal stability of the electrodeposited Ni-TiO2 composite increased with lower pH at the temperature range of 200~800oC, and the results showed that the amount of co-deposited TiO2 relies more on the deposition rate than zetapotential of TiO2 particles
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