| 摘要 |
PURPOSE:To enhance the work efficiency and maintain the plating quality of plated products at a high level by repeating a control cycle of measuring the concn. of a plating bath in a plating vessel and supplying a fresh plating bath to the vessel at constant time intervals. CONSTITUTION:Plating vessel 11 is divided into plating section 11-1 and agitating section 11-2, and plating bath 12 is fed to pH measuring section 22 and Ni measuring section 23 with pump 21 at constant time intervals. The signal of section 22 is sent to pH control section 29, and when the pH is low, pump 30 is driven to supply NaOH soln. 32 to vessel 11. The concn. of Ni bath 12 is measured in section 23, and the concn. signal is sent to Ni control section 35. In accordance with the signal pump 36 is driven to supply the necessary amount of replenisher 38 in tank 37 to section 11-2 through pipe 39, and the replenisher is agitated with air blown from air nozzle 19. The intervals of the concn. control cycle is changed. |
