| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 102 === In this research is to use alkaline electrolysis with the pulse current to produce zinc flake. Experimental reaction system equipment is 500ml, the processing via pre-experiment that choose the anode is stainless steel, the cathode is magnesium plate, the anode and cathode plates are processed through the grinding and polishing. In this experiment, 6M NaOH as the electrolyte, through to change frequency, duty ratio, voltage, zinc in the electrolyte concentration of 6M NaOH and cathode plate to experiment that which parameter can be produced zinc flake thickness from 0.1 to 0.3μm.
Changing in the current frequency are respectively 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz and 250Hz. The frequency range from 50Hz to 100Hz is the lower of the frequency that the zinc grow slower of grain growth and smaller particle. The frequency range from 100Hz to 250Hz are the higher of the frequency that the zinc rapid grow grain growth, but easily to reunite and large power; The duty ratio of pulse setting are respectively 0.025, 0.1, 0.2, 0.5, 0.8, the duty ratio in 0.5 is the best in another parameters, because of less reunite. The duty ratio range from 0.025 to 0.2 has the larger of the zinc surface pores. Changing in the voltage are respectively 100V, 150V, 200V, 250V and 300V, the voltage range from 100V to 200V is the lower of the voltage that produce zinc slowly and small of the particle, but reunion caused from resistance. the voltage range from 200V to 300V is the higher of the voltage that produce zinc fast and thick of the particle; Zinc in the electrolyte concentration are respectively 4, 6, 8, 12, 18, 24, 30 and 36 g-Zn/L. Zinc concentration range from 12 to 36 g-Zn/L are the higher of the zinc concentration that the zinc grains grew larger and thick; Zinc concentration range from 4 to 12 g-Zn/L are the lower of the zinc concentration that the zinc grains grew small. When the zinc concentration below 6 g-Zn/L or less, due to the small grains of zinc binding ability, resulting in agglomeration and thick.
Conditions for the optimal parameters can be learned from the experimental and data statistics, voltage is 200V, the duty ratio is 0.5, frequency is 50Hz, anode plate is stainless steel, cathode plate is magnesium plate, plates spacing are 90mm, zinc in the electrolyte concentration is 4 g-Zn/L, electrolysis time is 30min, producing zinc flake thickness is 0.3μm.
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