The simplest electroplating bath for electrochemical painting of metal parts in any color. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The simplest electroplating bath for electrochemical painting of metal parts in any color. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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For electrochemical painting of parts made of steel, brass or copper, it is necessary to assemble an electroplating bath and an electrical circuit, as shown in fig. 1. The electrode connected to the positive terminal of the element is made of sheet copper. The minus of the element is connected to the part to be painted. Care must be taken to ensure that the parts do not touch the copper plate. A special electrolyte is poured into the jar and an electrical circuit is closed.

The simplest electroplating bath for electrochemical painting of metal parts in any color

After 2-3 minutes, coloring will begin. At first, the part will turn brown, then purple, etc. Everything will depend on the time: 2 minutes - brown, 3 minutes - purple, 3-5 minutes - blue, 5-b minutes - blue, 8-12 minutes - yellow, 12-13 minutes - orange, 13-15 minutes - red, 17-21 minutes - green. For 1 liter of electrolyte, you need:

Copper sulphate ............. 60 g

Refined sugar .............. 90 g

Caustic soda ................ 45 g

Prepare the electrolyte as follows. Add 200 g of sugar to a solution of copper sulfate with a volume of 300-90 ml and mix thoroughly. Separately, 250 g of caustic soda is dissolved in 45 ml of water and a solution of copper sulphate with sugar is added to it in small portions, stirring constantly. Water is then added to make 1 liter of solution.

Care must be taken when working with caustic soda! To make the colors more contrasting, 20 g of anhydrous sodium carbonate salt is added to the finished electrolyte. After painting, the part is washed with water, dried and covered with a colorless varnish.

Electrolyte Recipes for Electroplating Baths

Electrolyte for satin copper plating

Copper sulphate (copper sulfate). . . 160-230 g

Sulfuric acid concentrated. . . 60-75 g

Water ................. up to 1 l

The working temperature of the electrolyte is 18-20°C, mixing is recommended. Current density 2-6 A/dm².

electrolyte for Fastcopper plating

Copper sulphate (copper sulfate) .... 250 g

Sulfuric acid concentrated .... 20 g

Chromic anhydride ............ 2 g

Water ................... up to 1 l

Operating temperature 18 to 25°C, stirring recommended. Current density 5 A/dm².

Electrolyte for brushed nickel plating

Nickel sulphate ............ 217,5 g

Nickel chloride ............ 46,5 g

Boric acid ............. 31 g

Water ................. up to 1 l

Bath operating temperature 50-70°С, current density 1,5-5 A/dm², pH=5,2-5,8.

Electrolytefornickel plating (hard coating)

Nickel sulphate ............ 150 g

Ammonium chloride ............ 20 g

Boric acid .............. 25 g

Water ................... up to 1 l

Bath operating temperature 50-60°С, current density 2,5-5 A/dm², pH=5,6-5,9.

Electrolyte for decorative chrome plating

Chromic anhydride ............. 400 g

Sulfuric acid concentrated ..... 4 g

Water .................... up to 1 l

Operating temperature 25-65°С, current density 20-50 A/dm².

Electrolyte for chromium plating (hard coating)

Chromic anhydride ............. 250. g

Sulfuric acid concentrated ..... 2,5 g

Water .................... up to 1 l

Operating temperature 25-65°С, current density 20-50 A/dm².

Electrolyte for tinning

Sodium stantanate ........... 75 g

Caustic soda ................ 11,5 g

Sodium acetate ........... 25 g

Water ................... up to 1 l

Operating temperature 65-70°С, current density 2-4 A/dm².

Electrolyte for ironing (hard coating)

Ferrous ammonium sulphate ........ 350 g

Sulfuric acid concentrated ..... 0,25 g

Water ................. up to 1 l

The electrolyte is used at a temperature of 18-20°C, current density 2 A/dm².

Electrolyte for silvering

Silver chloride .............. 40 g

Iron-cyanogen potassium (red blood salt) ................ 200 g

Potash .................. 20 g

Water ................... up to 1 l

Temperature, electrolyte 20-80°C. Current density 1-1,5 A/dm². Silver anode.

Publication: cxem.net

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