TREATMENT OF PLATING SOLUTION

摘要

PURPOSE:To remove iron ions selectively, easily and efficiently from an acidic plating soln. in a short time by treating the plating soln. with a chelate resin having phosphoric acid groups, phosphino groups and phosphono groups. CONSTITUTION:An acidic plating soln. contg. iron ions such as a galvanizing soln. is treated with a chelate resin having phosphoric acid groups and phosphino groups and/or phosphono groups. It is preferable that the chelate resin contains at least one kind of structural unit selected among units represented by formulae I-V (where R is H or halogen and/or alkyl) and has a macro-network (macroporous) structure. The plating soln. is preferably treated at about 1-6 pH by passing through a bed packed with granules of the chelate resin. The iron ions in the plating soln. are selectively adsorbed on the chelate resin by coordination and removed from the plating soln.