This sulphate based concentrate has been specifically developed for decorative applications. It will produce bright, white lustrous deposits up to a maximum thickness of 2.5 µm.
Typical requirements for 1 litre solution:
Demineralised or distilled water: 800 ml
Concentrated sulphuric acid: 20 ml (added cautiously to the water with stirring)
RJ100S: 20 ml
All components must be thoroughly degreased using trichloroethylene or a similar solvent.
Immediately prior to plating the parts should be immersed in dilute sulphuric acid (5% v/v).
Rhodium content: 1.5 - 2.5 g/l
Sulphuric acid content: 10 - 50 ml/l
Temperature: 20°C - 50°C (optimum 40°C)
Cathode current density: Up to 10 A/dm2 (optimum 2 A/dm2)
Current efficiency: 15 - 20 % at optimum current density