Chromium plating techniques

In this thesis, the effect of bath temperature and current density on the structure and properties of hard chromium plating made on TS ST37 iron parts were studied. Hard chromium plating experiments were made with three different chromic acid concentrations and in three different groups like conventional with inorganic catalyst and organic catalyst. The effects of different bath temperatures on hard chromium plating rate and percentage of current efficiency were observed by keeping the current density constant In addition, at constant bath temperature, the influences of different current density on plating rate and current efficiency were studied. In general, for all bath types at constant current density while bath temperature increases plating rate and current efficiency decreases. However when the bath temperature was kept constant increased current density resulted in increase of plating rate and current efficiency. Keywords : Hard Chromium Plating, Plating Rate, Current Efficiency