Iron Autoanalyzer for Nickel-Iron Plating Bath
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
Concentrations of Iron (II) and Iron (III) ions in NiFe plating solutions and the amount of Iron (III) existing in colloidal form in said same solution can be accurately measured and controlled using a rotating disk electrode (RDE) in combination with a computer. Integrated feedback control of the concentration of Fe (II) ions allows for timely reproducible continuous operation of the plating solutions. In general, the method comprises using limiting current density measurements with a rotating disk electrode. In the measurement of the Fe (II) ions, the sequence of steps is as follows: 1. Measuring the open-circuit potential of the RDE in the solution, 2. Applying an anodic voltage sweep at approximately 20 mv/s to the RDE at 400 rpm, 3. Repeating step (2) for 900, 1600 and 2,500, 4.