Galvanic method of etching metals. simple recipes

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Galvanic method of etching metals. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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But the above described etching of metals by chemical means, there is another method of etching using a galvanic battery.

This method has many advantages over the chemical one. The galvanic etching operation itself is much faster, and the contours of the etched pattern are sharper and more distinct. The composition of the pickle does not include caustic acids, as a result of which no gases harmful to health are formed. If we look through a magnifying glass at a chemically etched pattern, it will turn out that the edges of the individual recessed lines are uneven and that the deeper the line, the wider it is etched.

With the galvanic etching method, the edges of the individual lines are completely smooth, and the walls of the recesses are vertical. The method of pre-treatment of the object described above is also used for galvanic etching. The treated object, serving as an anode, is hung in a bath containing a pickle on a wire, which is soldered with tin solder to an uncovered place; the place of soldering is varnished. The other end of the wire is connected to a plate of the same metal that serves as the cathode.

As a dressing for steel and iron ferrous sulfate or ammonia solution is used; For copper, brass and bronze - a solution of copper sulfate; for zinc - zinc sulfate or a solution of zinc chloride. If different parts of the pattern need to be etched to different depths, then after a certain period of time the object is removed from the bath, those places that do not need to be etched deeper are rinsed and a protective coating is applied to them, and then the object is hung again in the bath and etching continues.

Compositions for etching

copper:

1 part alcohol;
1 part chromic acid;
10 parts of water.

aluminum:

1 part alcohol;
1,5 parts of acetic acid;
1 part antimony chloride (antimony oil);
10 parts of water.

lead:

8 parts of alcohol;
5 parts of stannous chloride;
80 parts of water.

Author: Korolev V.A.

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