METHOD FOR REDUCING THE CONCENTRATION OF IRON IONS IN A TRIVALENT CHROMIUM ELETROPLATING BATH

Method for reducing concentration of iron ions in a trivalent chromium electroplating bath, including:(i) providing the trivalent chromium electroplating bath including trivalent chromium ions, and iron ions,(ii) subjecting at least a portion of the bath to air agitation, to obtain an air-agitated portion of the bath,(iii) contacting the air-agitated portion with an ion exchange resin, to obtain a resin-treated portion of the bath, and(iv) returning the resin-treated portion of the bath to the trivalent chromium electroplating bath,provided thatthe bath provided in step (i) was or is utilized for electrodepositing chromium on a substrate applying a cathodic current density of 18 A/dm2 or more,after step (iii), iron ions in the resin-treated portion have a lower concentration than in the air-agitated portion, andafter step (iv), iron ions in the bath have a concentration below 50 mg/L.