Method of producing metal coatings on the surface of steel products

 

(57) Abstract:

The invention relates to metal coating. Getting protective, anti-friction, conductive copper layer on the surface of steel products is carried out in a solution of copper chloride with heating components by high frequency currents, and the concentration of the solution of chloride of copper should be at least 0.25 per cent and the temperature of the processing 1130 1180°C. table 1.

The invention relates to metal coating and can be used to produce a protective, anti-friction, conductive surface layer.

There is a method of copper plating carbon steel products, including electrolytic copper plating.

The closest is the method of applying metal coatings on the surface of steel products by treatment in a solution containing a salt of the metal coating during heating of the product by high frequency currents.

The disadvantages of this method include the need for prior preparation omednennoy surface (cleaning, degreasing, etching), the use of complex solutions, including scarce chemicals, the duration of the process of copper plating and relatively Neva is a continuous layer of copper steel product without prior purification, using the simplest solution in the short (seconds) time.

This is achieved by processing of the product is carried out in an aqueous solution of chloride of copper by the intense heating of the surface high-frequency currents to predlovennogo state within the shortest period of time.

In the known methods is the handling of specially cleaned and etched surface, because without this contact process is impossible. The treatment is carried out under heating, accelerating a chemical process, but not intensive enough to affect properties formed on the surface layer of copper.

Recovery of copper occurs by the interaction of its ions present in the solution with a reducing agent. This requires a fairly rigid parameters on the composition of the solution, introducing corrective additives, etc. In the case of deviations from the specified content of reducing agents and additives, in particular at relatively high copper content, there is an intensive process of recovering copper with the formation of loose falling sediment.

The main drawback of this technique is that upon the satisfactory carrying out of the process of the formed layer is the outer coat of the product is low.

In the prototype, there is no mention of the use of copper-containing solutions and the method of copper plating the surface of the product.

The proposed method it is possible to treat the surface of the product in dilute solutions of copper chloride, without adding additional ingredients and without pre-treatment of corrosion products and other contaminants. Forming a layer of copper coating organically embedded in the surface of the product and makes it whole, forming a solid solution, covered with a layer of pure copper.

It is possible to observe visually the top red layer (pure copper) gradually becomes yellow (solution of copper in iron) and, finally, in silver grey (iron) layer. Confirmed this fact melting temperature of the surface layer (1150aboutC) and metallographic studies of the cross section of a steel sample.

Thus obtained copper layer is held so firmly that removed only a rough abrasive action (emery circle, file) together with the metal base of the product.

In the process cleans the surface of the product from contamination due to cavitation phenomena that occur when no temperature is not above 70aboutC.

Falling on the hot part of the solution instantly boils and the resulting superheated steam knocks dirt from the surface. At the same time is the chemical reduction of copper

Cu2++2Cl-=Cu0+Cl2< / BR>
Cu2+Fe0=Fe2+Cu0< / BR>
At high temperature atomic copper is embedded in the surface, forming a solid solution, which is easy enough crystallized copper, aided by a sharp cooling surface in contact with the water solution.

Heating the details of the high-frequency current is very fast, so the time going through the whole process amounts to seconds (see examples).

Of great importance is the temperature of the processing. In our experiments we observed the following: at room temperature and a relatively small heat proceeding normally contact the recovery of copper with the formation of loose, easily washable layer (especially in strong solutions); at high temperatures (>800aboutC) begins rapidly undergoing a chemical process; at a temperature close to 1200aboutobserved melting the metal surface.

Thus, the proposed spoke.

P R I m m e R. Source materials:

the tube from St-3 with a diameter of 28 mm;

solutions of copper chloride CuCl2different concentrations.

The method of processing a sample of 15-20 cm in length is inserted into a special device that allows to process tube in a dynamic (with simultaneous rotation and translational motion) mode. The tube is inserted into performed two-inductor, the end of her warmed up for 5 s, after which included movement and rotation. Processing ends after passing through the entire tube through the inductor at a speed of 6 mm/s provided by the installation. In the process changed the concentration of the solution, temperature of processing, speed of movement and rotation. Control by metallographic analysis of the cross section of the sample and the measurement of the thickness of the treated layer, which is the main control measure. In the indicator layer thickness in the tables, is the surface layer of products containing copper.

The methodology of the experiments in all the examples of continuous (example 1), so the description of each experience as an example of the falls are only the results obtained when changing the individual parameters and given in the table.

Results op">

The concentration of the solution is not lower than 0.25% of practically no effect on the coating quality, but increase it activates the process of contact excretion of copper in the form of loose sediment and unproductive loss.

The speed is noticeable impact, but with too much speed there is a slight unevenness of density of coating, which is undesirable, though not very significant moment, the best results are obtained when the rotation speed of about 75 rpm

METHOD of producing METAL COATINGS ON the SURFACE of STEEL PRODUCTS, which consists in the fact that the process of formation of coatings lead to the solution containing the salt of the metal coating, and heating the coated products by high frequency currents, characterized in that as a solution containing a salt of the metal-coating, take a solution of copper chloride at a concentration of not lower than 0.25, the heating is carried out at 1130 1180oC.

 

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