SU452626A1 - Palladium electrolyte - Google Patents

Description

one

The invention relates to the field of electrochemical deposition of metals, in particular to the electrochemical deposition of palladium.

The palladium electrolyte is known, which contains the amine complex of palladium, ammonium chloride and sulphate.

The proposed electrolyte differs from the known one by introducing polyether leshcreamine as a complexing agent and urotropine into its composition, which improves the quality of precipitates in the pH range from 1.5 to 10

Electro unit contains palladium, polyethylene polyamine, ammonium chloride and ammonium sulphate and hexamine in the following ratio of components, g / l:

Palladium18-20

Polyethylenepolyamine 50-6O

Ammonium Chloride 5О-6О

Ammonium sulphate

NII2O-ZO

Urotropin0,5-1,5

The precipitates are carried out at room temperature, current density of 1 ° C / dm, pH 1.5-1O, O.

Precipitations are semi-bright, strongly bonded to the base. Domestic napr. 2 sheds of rain 5OO-10OO kg / cm. Micr hardness 2OO-21O kg / mm. Electrolyte is stable in operation. Current output 63%, electrolyte scattering capacity 55%

The electrolyte is prepared as follows.

Polyethylenepolyamine, ammonium chloride and ammonium sulphate are dissolved in water (O volume). Then, at 5 ° -6 ° C, palladium in the form of chloride salt and ypoipopine are introduced and the pH of the electrolyte is adjusted to the required value with hydrochloric acid or ammonia.

Example. During the electrochemical deposition of palladium in an acidic medium, SJIOKIrolit contains g / l: Palladium chloride (in terms of metal) 1 8

For ethylene polyamine 5O

Ammonium Chloride

Ammonium Sulphate

 Urotropin1,5I The process is carried out at a temperature of 2 ° C, a current density of 1.5 a / dm, pH 2 using soluble palladium anodes. The ratio of the anodic and cathodic surface is 2: 1. Stationary potential of the palladium electrode 0.53 in. The current efficiency is 65%, the scattering ability of roller blast is 50%. Precipitations are semi-bright, strongly bonded to the base, internal pressures -2–5 560 kg / cm, microhardness 2120 kg / mm. PRI mme R 2. When electrochemical deposition of palladium in a neutral medium, the electrolyte contains, g / l: Palladium chloride (in terms of metal) 20 Polyethylene polyamine 6 O Ammonium chloride 6 Ammonium sulfate Urotropin. 1 | О Pritsess is carried out at 2O С, density of current 2а 1а / dm, pH 7. Stationary potential of the palladium electrode O, 75 V. The current output is 6%, the scattering power of electrolyte is 60%. Precipitations are semi-bright, strongly adhered to the base, internal stresses 2 or 1OOO kg / cm, microhardness 2OOkg / Example 3. When electrochemical deposition of palladium in an alkaline medium, the electrolyte contains, g / l: Palladium chloride (in terms of , on metal) 20 Polyethylenepolyamine6O Ammonium Chloride5O Ammonium Sulphate. Urotropin1, O The process is carried out at 2O С, current density 1.5 a / dm, pH 9. The stationary potential of the palladium electrode is 0.88 V. The current output is 65%, the scattering capacity of the electrolyte is 55%. The sediments are deep, strongly bonded to the base, internal stresses are 900 kg / cm, and the microhardness is 2,200 kg / mm. The subject matter of the invention is palladium electrolyte containing amine complex palladium, ammonium chloride and sulphate, characterized in that, in order to increase the quality of precipitates in the pH range from 1.5 to 10, Polyethylenepolyamine as a complexing agent and urotropine are added to the composition, g / l: Palladium18-2 О Polyethylenepolyamine5O-6O Ammonium Chloride5O-60 Ammonium Sulfate 20-ZO Urotropin 0.5-1.5