REDUCING METHOD OF FE3+ ION AND/OR CR6+ IN ELECTROPLASTING SOLUTION

摘要

PURPOSE: To rapidly and efficiently reduce Fe³⁺ ion and/or Cr⁶⁺ ion in an electroplating solution while stably keeping balnance in the plating solution at the time of continuously producing an electroplated steel sheet with a continuous electroplating device. ;CONSTITUTION: Fe³⁺ ion and/or Cr⁶⁺ ion are reduced to Fe²⁺ ion and/or Cr³⁺ by supplying respectively gaseous hydrogen to the side of a gas permeable layer of a double structured film composed of a water-repellent gas permeable layer and a hydrophilic reaction layer and the electroplating solution containing Fe₃₊ ion and/or Cr₆₊ ion to a racting layer side to convert gaseous hydrogen to hydrogen ion in the former reaction layer of the double layer structured film and to reduce the Fe³⁺ ion end/or Cr⁶⁺ ion in the electroplating solution to in the latter reacting layer to Fe²⁺ ion and/or Cr³⁺ ion, respectively.;COPYRIGHT: (C)1995,JPO