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SELF-DIMENSIONAL INSTALLATION FOR GALVANIC COATING
In the repair and amateur practice, it is also possible to successfully use a miniature, empty-free galvanic installation (Figure 1). It consists of a special brush with bristles (brush diameter 20-25 mm , its body is made of organic glass, inside of which an electrolyte is poured), a step-down transformer for 12 volts In addition, the current is 0.8-1 A or the battery is also a connecting cord.
Fig. 1. Miniature galvanic installation
Bristle bristles are wound with lead (in extreme cases irradiated with copper) wire. The semiconductor diode D303-D305 is installed on the brush body. One of the wires of the winding of the transformer is connected to the anode of the diode, the other by means of a clamp "crocodile" - with the part to be coated. The diode cathode is connected to the winding wire of the brush. If a battery is used, the diode is not needed.
The parts to be covered are cleaned of rust, grease is also greased, wiped with a dry clean cloth and degreased in a solution containing 100-150 g of sodium hydroxide, 40-50 g of soda ash plus 3-5 g of liquid glass (silicate adhesive) per 1 liter . Depending on the degree of contamination, the parts are kept in a degreasing composition, heated to 80-100 ° C , from 15 minutes up to 1 hour . The smoother the surface is, the more durable will be the galvanic coating. The prepared part is connected with the winding of the transformer, the brush is poured into the electrolyte and also includes feeding. Evenly moving the brush on the surface of the part, cover it with metal, precipitated from the electrolyte. To obtain a coating of sufficient thickness, it is necessary to brush by the same same room 20-25 times. Electrolyte is added to the brush by the measure of its consumption. Later, the parts are washed in flowing water and polished in a cloth moistened with water, then washed again and dried. For each type of coating, a special electrolyte is prepared, prepared according to the following recipes (in grams per liter of solution):
Electrolyte for copper plating:
| Electrolyte for galvanizing:
| Electrolyte for nickel plating:
|| Electrolyte for silvering:
Electrolyte for chrome plating:
| Electrolyte for gilding:
In 200-300 ml of distilled water, dissolve the first order of the substance, then the second, third, etc., only then add water to 1 liter .
It should be borne in mind that, although solutions also do not contain much poisonous substances, they should be treated with care to avoid burns and poisoning. Solutions are best preserved in a dark glass container with ground glass stopper.
It is necessary to take into account that not all coatings fit well on various metals. For example, in order to coat a steel part with nickel, it is preliminarily coated with a thin layer of copper, chromium also adheres well to the nickel-plated surface. A copper sublayer before nickel plating or silvering is desirable to be deposited on parts made of bronze. Copper also brass parts silver without a sub-layer of copper.
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