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Electroplating / Silver plating

Pragogal Ag 710
complex- forming salt for the preparation cyanide- based silver plating bath

Pragogal Ag 710
complex- forming salt for the preparation cyanide- based silver plating bath

It is a complex-forming salt for the preparation of cyanide-based silver electroplating bath suitable for both rack as well as barrel plating, the coatings deposited being dull. To achieve a sufficient adhesion of the coatings even to the less noble substrates, it is necessary for the wares to be preplated with a coating of a lower silver content at first. The bath should be started in the concentration of 100 g/litre for the rack plating and 150 g/litre for the barrel one.

Running conditions of the bath:

Bath parameter Rack plating Barrel plating
Cathodic current density 0,2 - 1,5 A/dm2 0,3 - 1 A/dm2
Voltage 0,5 - 1,5 V 8 - 15 V
Bath temperature 20 - 25 °C 20 - 30 °C
Bath filtration Occasionally
Anodes Pure silver
Cathode/anode surface ratio 1:1 1:1 to 3:1

Pragogal Ag 720
alkaline cyanide-based silver plating bath for the deposition of hard silver coatings

Pragogal Ag 720
alkaline cyanide-based silver plating bath for the deposition of hard silver coatings

It is an alkaline cyanide-based hard silver electroplating bath for both rack and barrel electroplating. The coating deposited is made of the alloy of both silver and antimony (1 – 3% Sb) with the hardness value HV20 = 170 – 240 kg/mm2. The coating itself is of semi-bright-to-bright appearance, of high corrosion durability, easy to be soldered and less liable to the touch-induced corrosion compared with dull plated coatings made of pure silver.

The bath should be prepared from the complex-forming salt Pragogal Ag 720 in concentration of 220 g/litre for the rack mode of plating and 260 g/litre for the barrel one, together with 25 – 35 millilitres/litre of the Pragogal Ag 721 brightener and 25 – 35 millilitres/litre of the Pragogal Ag 722 additive respectively.

Running conditions of the bath:

Bath parameter Rack plating Barrel plating
Cathodic current density 0,3 - 2,5 A/dm2 0,5 - 1,5 A/dm2
Voltage 0,5 - 4 V 8 - 15 V
Bath temperature 20 - 25 °C 20 - 30 °C
Bath filtration Occasionally
Anodes Pure silver
Cathode/anode surface ratio 1:1 1:1 to 3:1

Pragogal Ag 730
salt for the preparation preplating silver bath

Pragogal Ag 730
salt for the preparation preplating silver bath

It is a complex-forming salt for the preparation of silver preplating bath suitable for both rack as well as barrel mode of plating. The bath should be prepared by dissolution of 8 kg of the agent in 100 litres of water.

Running conditions of the bath:

Bath parameter Silver preplating
Bath temperature 18 - 25 °C
Cathodic current density 0,2 - 1 A/dm2
Voltage 2 - 3 V
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