Oxidation and bronzing of metals. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Oxidation and bronzing of metals. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Brown oxidation of copper

Acetic-copper salt (in crystals) 5 g;
Ammonia 7 g;
Acetic acid 3 g;
Water 85 g.

Copper objects to be brown oxidized are strongly heated on coals, then immersed in the indicated composition or smeared with it, after which they are covered with a solution of 1 wt. h. Wax in 4 wt. hours of turpentine oil.

Copper bronzing

Nickel sulphide salt 100 g;
Bertolet salt 200 g;
Copper sulfate 900 g;
Potassium manganese salt 10 g;
Water 5 l.

The cleaned items are dipped into a preheated solution:

Ammonium chloride 30 g;
Acid oxalic salt 10 g;
Acetic acid 0,25 l.

Cleaned objects are rubbed with a soft brush or linen cloth with this solution until the rubbed area is completely dry.

The operation is repeated until the color of the desired shade is obtained.

Copper coloring

Brown color

100 g of ammonium thiocyanate are dissolved in 3 cm10 of water, then 10 g of ammonia (sp. w. 0,91) and a solution of 3 g of copper sulfate in 9 cm3 of water are added. The item is placed in the solution for 5 hours.

Another recipe is also used: dissolve 100 g of zinc chloride and 100 g of copper sulfate in 200 g of water.

steel gray

Items are immersed in the solution:

Table salt 2 g;
Sulfuric liver 2 g;
Water 1 l.

Green-blue color

They make up a mixture of 225 g of acetic-copper salt, 113 g of zinc oxide, 56 g of borax, 56 g of sodium nitrate and 25 g of sublimate. Add linseed oil.

Greenish color

Ammonia 10 g;
Carbon ammonium salt 30 g;
Water 240 g.

Objects are covered with this solution. If thick tragacanth glue is introduced instead of water, the patina will become darker and after 7-8 hours the color will take on a bluish-green tone.

When re-coated, the color becomes more juicy and beautiful. Covering with a thin layer of copal varnish diluted with turpentine oil gives the same result. Other metals are usually plated with copper first and then painted.

Work should be done only in a cool room, since ammonium carbonate and ammonia easily evaporate in a warm atmosphere.

The above method is suitable for both copper and brass and bronze.

Obtaining a matte black color of brass and bronze by oxidation

1st recipe:

Carbohydrate salt 120 g;
Ammonia 1000 g;
Water 2 l.

The carbonic salt is dissolved in ammonia, mixed well and water is added.

2st recipe:

Carbohydrate salt 120 g;
Ammonia 600 g;
Water 360 g.

The objects are kept in the solution until they turn black, washed with cold water and dried in sawdust. The strength of the color will increase if, after drying, wipe the object with turpentine oil.

Black color zinc

Copper sulfate 100 g;
Bertolet salt 10 g;
Water 500 g.

Dissolve copper sulphate and Bertolet's salt in hot water. After cooling, the solution is filtered. Zinc objects are carefully cleaned and dipped for a moment in a weak solution of hydrochloric acid; then thoroughly washed and dipped for a second in the staining solution. Very good results are obtained on matt polished small objects.

Brass coloring

Brass objects to be painted in different colors must first be polished and washed with gasoline to remove the slightest traces of fatty substances, and then coated with an appropriate solution.

For blue

Sodium sulphate salt 1 g;
Water 150 g.

For orange red

Potassium sulfide 1 g;
Water 250 g.

For red with a brown tint

Nitrogen-copper salt 7 g;
Oxalic acid 7 g;
Water 125 g.

For red-brown

Sodium sulphate salt 15 g;
Nitric acid 1 g;
Water 250 g.

For reddish brown

Nitrogen-iron salt 6 g;
Sodium sulphate salt 6 g;
Water 100 g.

For dark brown

Ferric chloride 1 g;
Water 100 g.

For dark brown

Nitrogen-iron salt 1 g;
Water 100 g.

Oxidation of iron to black and brown-black

Heat the iron object to 100 °C, dip it for a moment in a solution of dichromate-potassium salt in water (1:10), air-dry and hold it for 1-2 minutes over hot coals. This procedure is repeated 2-3 times and finally, if the temperature was correct, a brown-black color is obtained. If the heating was too high, objects become completely black and without a metallic sheen.

Oxidation of iron and steel to blue, brown or black

The iron or steel object to be painted must be polished and grease removed from it using gasoline. To obtain a black color, the surface to be painted is coated with a solution of copper-nitrogen salt. The object is heated to 50 °C and then poured with machine oil from an oil can.

To obtain a brown color, you need to add a solution of nitrogen-manganese salt to nitrogen-copper salt: the more nitrogen-manganese salt is added, the lighter the brown color will be. To obtain a deep blue color, mix 50% nitrogen-copper salt and 50% nitrogen-manganese salt. To obtain a light blue color, you need to slightly increase the amount of nitrogen-manganese salt.

Author: Korolev V.A.

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