Abstract
Loss of fluorides added to the Cr plating bath as catalyst for electrodeposition was observed in the recovery process of the bath by vacuum evaporation. This was attributed to the evaporation loss of HF formed as a result of dissociation of the added fluorides. Evaporation of HF took place together with evaporation of water and was affected by the pressure and concentration ratio of the vacuum evaporator. The loss of fluorides increased with increasing evaporation temperature and chromic acid concentration.
