FE-BASED ELECTROPLATING DEVICE AND ITS PH CONTROLLER

摘要

PURPOSE:To increase the dissolving rate of metallic iron by providing a sulfuric acid storage tank for directly supplying sulfuric acid to a metal dissolving tank, calculating the pH in a plating cell based on the amts. of the metal powder and sulfuric acid charged, and adjusting the amt. of sulfuric acid to be supplied. CONSTITUTION:A sulfuric acid storage tank 16 is connected to a metal dissolving tank 14, and sulfuric acid is directly supplied to the dissolving tank. Iron powder and zinc powder are charged to the tank 14 from hoppers 22 and 24, and the charges are inputted to a computing element 20 as the charge signals 25 and 26. A signal for the total current value, etc., is sent to the computing element 20 from an electroplating rectifier 28. The pH value of the plating soln. in a plating cell 10 is calculated based on the data. The amt. of sulfuric acid to be added to the tank 14 is calculated based on the result. The amt. is sent as the command signal 21 to the control system consisting of a sulfuric acid flowmeter 18 and a sulfuric acid flow control motor-driven valve 19.