HYDROLYSIS OF SULFAMATE ION IN NICKEL SULFAMATE SOLUTION

The rates of hydrolysis of sulfamate ion in various solutions have bee n studied at 25 to 90-degrees-C, before and after plating. Aside from the influence of electrolyte concentration, the rate of hydrolysis inc reased with increasing acidity, temperature, and anode current density . The products of hydrolysis, ammonium and sulfate ions, increase the internal stress and hardness of the deposits obtained. Taking advantag e of decreased acidity at the electrolyte-anode interface, a larger ra tio of anode-to-cathode area was used to decrease the rate of hydrolys is of sulfamate ion in the plating solution.