| 摘要 |
PURPOSE:To enable sulfuric acid soda concentration and hexavalent chrome concentration which are especially important in management of composition of a neutral salt (sulfuric acid soda) electrolytic bath for descaling stainless steel to be measured readily, easily, frequently, and continuously. CONSTITUTION:An ultrasonic propagation speed and a liquid-solution conductivity are measured for a sample bath for measurement which is filtered through a neutral salt electrolytic bath and this relationship is subjected to temperature compensation for obtaining each constituent concentration by a set of measurement values consisting of a measurement value of the ultrasonic propagation speed and the liquid-solution conductivity which are created for each of a plurality of temperatures around a temperature at the time of measurement of a liquid solution of sulfuric acid soda and a hexavalent chrome where various kinds of concentration curve indicating a relationship between the calibration curve indicating a relationship between the sulfuric acid soda concentration and a the liquid-solution composition indicated by a hexavalent chrome concentration, thus enabling a work load required for controlling concentration of the electrolytic bath, bath conditions to be adjusted easily and descaling capacity to be stable, and quality to be improved. |
