| 摘要 |
PURPOSE:To save pure water for neutralization and to prevent the sticking of sludge to a diaphragm by placing a diaphragm electrode mechanism surrounding a counter electrode which confronts a body to be coated and a means of setting the electric conductivity of an electrolytic soln. in the mechanism at a certain value or above. CONSTITUTION:Water paint 3 is filled into a tank 2 for coating by electrodeposition, and an electrode 4 as a body to be coated and a counter electrode 5 which confronts the electrode 4 are arranged in the tank 2 so that the electrode 5 is put in a diaphragm electrode mechanism 10 having a diaphragm 8. An electrolytic soln. is circulated between the mechanism 10 and an electrolytic soln, tank 16. An electric conductivity sensor 26 is laced above the tank 16 to measure the concn. of acetic acid. A rise in the concn. of acetic acid is inputted in a control circuit 27 as a change in electric conductivity, and a solenoid valve 28 is operated so that the electric conductivity of the electrolytic soln, in the mechanism 10 is kept at >=1,000 microsiemens/cm by feeding pure water or suspending the feed. By this structure, the electric resistance of the diaphragm is increased with the lapse of time, so satisfactory coating by electrodeposition is carried out.
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