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TECHNOLOGY OF COATING METALS WITH PRECIOUS
AND COLORED METALS
1 | 2
Glossary of terms
For silvering of small items of zinc, copper and brass, the following method is proposed: a dough made from 125 elements of table salt, 125 elements of wine flint, and 2 parts of freshly precipitated silver chloride. Two parts of this test are mixed with 100 parts of water, heat the liquid until boiling, plus objects placed in a porcelain sieve. Objects should remain in the boiling liquid for a relatively long time.
For silvering of objects by rubbing, the following mixture is recommended: 1 part of silver chloride, 3 elements of table salt and 3 elements of a tartar.
For silvering with zinc contact, i.e. Bringing the metal surface into contact with the zinc rod, take 10 elements of silver nitrate, pour a sufficient amount of hydrochloric acid, precipitate also wash the sulphate obtained in the sludge. The latter is dissolved with 70 elements of ammonia, plus add to the solution of 40 elements of potassium cyanide, 40 elements of soda, 15 elements of table salt and 1000 elements of water.
For the silvering of copper, 3 parts of the silver salt of nitrate are mixed, 2 elements of sodium chloride are also mixed with 210 elements of cremortartar. For silvering, take a little of this powder plus rub with a wet cloth ragged surface of a copper object.
For the silvering of copper, it is possible to successfully use the following liquid: 14 elements of silver chloride, 21 parts of potassium oxalate, 30 parts of sodium chloride and 7.5 elements of ammonium chloride are dissolved in 6-10 parts of water.
For brass silvering, the following liquid is also used for brass silvering: 30 parts of the silver salt of nitrate are dissolved in 100 parts of distilled water, the solution of 10 parts of sodium chloride in 100 parts of distilled water is added with a constant stirring, and a mash consisting of 65 elements of chalk, 30 elements of a tartar, 150 elements of ammonia (specific gravity 0.960) also 60 elements of distilled water. The mixture is stored in a dark room. Covered with a layer of silver items made of copper, brass or iron (previously covered with a layer of copper dropping into a solution of copper sulfate) thoroughly cleaned and rubbed with the above mixture with a cloth until a silver layer is obtained. In the end, rinse with warm water. The mixture is stored in orange bottles in a dark room.
There is a way of silvering any metals in a hot solution without using a current. To do this, a well-defatted piece on the zinc tape is lowered into the boiling solution of the trail. Composition:
Ferroelectric potassium - 120 g
Potash (photoshop) - 80 g
Silver chloride - 7.5 g
Dist. Water up to 1 liter
Silver, washed in running water, it must be polished.
Yes, it is best to chemize either on the street or under traction.
Gilding of metals
All metals can be damaged by a zinc contact, i. Bringing them into contact with a zinc rod, the following liquids:
A) 2 elements of chlorine gold, 5 elements of potassium cyanide, 50 elements of sodium sulfurous, 60 parts of phosphate sodium salt are dissolved in 1000 parts of distilled water. This fluid is used when heated.
B) 1 part of chlorine gold, 3 elements of potassium cyanide, 2 elements of sodium chloride, and 2 parts of the carbonate salt are dissolved in 150 parts of distilled water. This liquid is used in the cold.
On iron also steel can be purchased gilding directly with the help of a solution of chloride gold in ether. By evaporation of the ether on the surface of the metal, a refined layer of gold is formed, which becomes metallic from the friction. Drawing this solution with a pen, you can buy on iron plus steel beautiful gold drawings.
Another means of gilding etched ornaments can be painted with gilding. The most ingenious means of gilding is gold ether. The royal vodka in the bottles is saturated with gold leaf and diluted with ether in a number equal to that of the royal vodka. Later this bottle is closed plus thoroughly mixed with its contents. Ether absorbs gold dissolved in royal vodka, also floats to its surface. Ether, saturated with gold, carefully poured into a vessel with ground glass stopper, also stored in it. This golden ether is applied with a brush to the product, the ether escapes hastily, but gold adheres to the surface of the product. Gilded in this way the surface of the product must be glazed with a steel smoothing iron.
Platinizing of metals
Copper and brass objects are covered with a thin layer of platinum in the following solution heated up to boiling: 1 part of ammonia platinum (ammonium chloroplatinate), 8 parts of ammonia and 40 water elements. After plating, the objects are cleaned with chalk. For the same purpose, the objects can be rubbed with a mixture consisting of equal elements of ammonia platinum also of a tartar.
Steel and iron objects can be platinum, covering them with a solution of chlorine platinum in ether.
For the plating of small fancy things, a solution of 10 chlorine platinum elements, as well as 200 parts of common salt in 1000 parts of water, which is brought to the boiling point, can be served, to which a little caustic sodium is added before the alkaline reaction. In this solution, it is possible to platinize similarly with zinc contact, i.e. Causing the metal surface to come into contact with the zinc rod.
Nickel plating of iron also became
In addition to the galvanic method, one can use the following, very simple method for coating polished steel or iron with a thin, but very strong layer of nickel. Take a 10% solution of pure zinc chloride plus gradually add to the solution of nickel sulfate, until the liquid turns green, then it is slowly heated to the boil, best in a porcelain vessel. The turbidity can appear at the same time and has no effect on the nickel plating, which is carried out in the following way: at which time the aforementioned liquid will be brought to a boil, the object to be nickel plated is lowered into it, and the final one must first be thoroughly cleaned and also degreased. The object is boiled in the solution for about an hour, adding time to distilled water by the measure of its evaporation. If it's time to boil, it will be noticed that the paint of the liquid instead of bright green has become weakly green, then add a little sulphate nickel until the original color is obtained. After the expiration of the aforesaid pore, the object is taken out of solution, washed in water, in which a small number of chalk is dissolved, and carefully dried. Polished iron or steel, coated in this way with nickel, very firmly hold this coating.