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TECHNOLOGY OF METAL COATING WITH PRECIOUS
AND COLORED METALS
1 | 2
For silvering small items made of zinc, copper and brass, the following method is proposed: prepare the dough from 125 elements of salt, 125 elements of wine flint, and 2 parts of freshly precipitated silver chloride. Two parts of this dough are mixed with 100 parts of water, heat the liquid up to the boil, and add items placed in a porcelain sieve. Items must remain in the boiling liquid for a relatively long time.
For silvering objects by rubbing the following mixture is recommended: 1 part silver chloride, 3 elements of table salt and 3 elements of tartar.
For silvering with zinc contact, i.e. bringing the metal surface in contact with the zinc rod, take 10 silver nitrate elements, pour it with a sufficient number of hydrochloric acid, precipitate also washed the resulting silver chloride sludge. The latter is dissolved with the help of 70 elements of ammonia plus added to a solution of 40 elements of cyanic potassium, 40 elements of soda, 15 elements of sodium chloride and 1000 elements of water.
For the silvering of copper, 3 parts of silver nitrate salt are mixed, 2 elements of sodium chloride, and also 210 elements of cremetartare. For silvering they take a little of this powder plus rub the cleaned surface of a copper object with the help of a cloth soaked in water.
For silver copper, it is possible to use the following liquid with success: 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 silver, copper also uses brass. The following liquid is used: 30 parts of nitro-silver salt are dissolved in 100 parts of distilled water, and a solution of 10 elements of 65 chalk, 30 tartars, 150 elements of ammonia (specific gravity 0.960) and 60 elements of distilled water. The mixture is stored in a dark room. Covered with a layer of silver objects made of copper, brass or iron (pre-coated with a layer of copper by lowering into a solution of copper sulphate) are carefully cleaned and rubbed with the above mixture using sukonki until a silver layer is obtained. In the end, wash off with warm water. The mixture is stored in orange flasks in a dark room.
There is a method of silvering any metals in a hot solution without the use of current. To do this, a well-degreased part on a zinc ribbon is dipped into a boiling solution following. composition:
Iron-synergistic potassium - 120 g
Potash (photoshop) - 80 g
Silver chloride - 7.5 g
Dist. water - up to 1 l
Silver, washed in running water, it is necessary - polished.
Yes, it is best to chemise either on the street or under the burden.
All metals can be gilded with the help of zinc contact, i.e. bringing them into contact with the zinc rod with the following liquids:
a) 2 elements of gold chloride, 5 elements of potassium cyanide, 50 elements of sodium sulphite, 60 parts of phosphorus sodium salt are dissolved in 1000 parts of distilled water. This liquid is used when heated.
b) 1 share of chlorine gold, 3 elements of cyanide potassium, 2 elements of sodium chloride and 2 parts of carbonaceous salt are dissolved in 150 parts of distilled water. This liquid is consumed in the cold.
On the iron they also began to acquire gilding directly with the help of a solution of gold chloride in the air. Upon evaporation of the ether, a thin layer of gold forms on the surface of the metal, which from friction acquires a metallic radiance. Painting with this solution with the help of a pen, you can acquire beautiful gold drawings on the iron plus.
Another means of gilding. Corroded ornaments can be decorated with gilding. The most artless means of gilding is the golden ether. King's vodka in the bottle is saturated with gold leaf and diluted with ether in a number equal to the capacity of the king's vodka. After this the bottle is closed and its contents are thoroughly mixed. Ether absorbs gold dissolved in aqua regia, and also floats on its surface. The ether saturated with gold is carefully poured into a vessel with a ground in stopper, it is also stored in it. this golden ether is applied with a brush to the product, the ether quickly evaporates, however gold adheres to the surface of the product. The surface of the product, gold-plated in this way, must also be polished with a steel trowel.
Copper and brass objects are covered with a thin layer of platinum in the following solution, heated to boiling: 1 share of ammonium platinum (ammonium chloroplatinate), 8 parts of ammonia and 40 elements of water. After platinizing, objects are brushed with chalk. For the same purpose, objects can be a mixture consisting of equal elements of ammonia platinum and tartar.
Steel and iron objects can be platinum coated with a solution of platinum chloride in the air.
For the platinization of small haberdashery things, a solution of 10 elements of platinum chloride and 200 parts of common salt in 1000 parts of water, to which a little caustic sodium is added to an alkaline reaction, brought to a boil, can serve. In this solution, it can also be platinized similarly to zinc contact, i.e. bringing the metal surface in contact with the zinc rod.
Iron nickel plating also became
In addition to the electroplating method, you can also use the following, very simple method for coating polished steel or iron with a thin, but very durable layer of nickel. A 10% solution of pure zinc chloride plus is gradually added to the nickel sulphate solution until the liquid turns a bright green color, then it is slowly heated until boiling, preferably in a porcelain vessel. The dregs that can appear in this way have no effect on nickel plating, which is performed as follows: at what time the aforementioned liquid will be brought to a boil; The object is boiled in the solution for about an hour, adding time to distilled water as measured by evaporation. If at the time of boiling it will be noticed that the dye of the liquid instead of bright green became weak-green, then a little nickel sulphate is added until the original color is obtained. After the aforementioned pores have elapsed, the object is removed from the solution, washed in water, in which a small amount of chalk is dissolved, and dried thoroughly. Polished iron or steel coated with nickel in this way holds this coating very firmly.