SU981459A1 - Method for electrochemically treating parts with symmetrical alternating current - Google Patents

Description

The invention relates to electroplating engineering and can be used for etching, oxidizing various metals, especially for coloring anodized aluminium and its alloys. In the famous sthobah. Electrochemical processing of products, such as direct current, as well as a symmetrical variable, electrodes from workpieces (or suspensions with abateable products) are always placed in electrolyzers between electrical electrodes for uniform processing of products from all sides. For example, three anode rods with counter electrodes are used for two cathode rods with electrodes (with pendants made from fabricated products). For the four bars with electrodes from the processed products there are five bars with a counter electrode fij. The purpose of the invention is to increase the conductance of the electrolysis cell for electrochemical processing of products with symmetrical alternating current and to save electricity. This goal is achieved by the fact that in a known method of electrochemical processing of products of si, metric alternating current, including the installation of a group of products in a bath between counter electrodes, processed products are used as counter electrodes of the middle part of the electrolyzer. The process is carried out in case of separate regulation of the currents between the product electrodes ip-worn by the mi-counter electrodes. The current to the electrode is supplied from the additional secondary winding of the transformer, one end of which is connected to the same end of the main secondary winding. The drawing shows a diagram of the device that implements the method. The circuit includes the primary eur of the transformer 1, the main secondary circuit 2 and 3, the additional secondary region 4 n 5, the counter electrodes

6 and 7, electrodes from processed products 8.9 and 10, ammeters 11, 12 and 13,,

In the implementation of the proposed method, one should take into account the different polarization resistance of the counter electrodes and the treated electrodes (products). For example, the polarization resistance of workpieces made of pre-anodized aluminum is much greater than the polarization resistance of copper counter electrodes. Therefore, using well-known circuits and methods (i.e., when on the device shown in the drawing, terminals 4 and 5 are combined and the number of turns of the additional secondary winding is O), all the current would mainly flow between the copper 6 - counter electrodes and 7 and electrodes 8 and 1O, and between electrodes 8, 9, 10 the current would be much less and therefore there would be no uniform treatment by the current of electrodes 9, 8 and 10 on all sides. .

Introducing variable resistors in a circuit with counter-electrolytes € | and 7, in order to level their polarization resistance with the polarization resistance of the processed electrodes 8, 9 and 10, is impractical because of the additional power consumption.

In this method, a uniform supply of current to the ablated electrodes (product) is carried out by separate current by electrodes 9 and 8, 1О (controlled by ammeter 12) by changing the number of turns in the main secondary winding 2 and 3, and by changing the number of turns on ds yuli secondary Continuity 4 and 5 is set to the same current through the ammeter 13, passed through the electrode electrodes 6 and 7 and electrodes 8-10. Ammeter 11 shows the total current,

PRI me R. Electrical coloring of pre-anodized aluminum plates (electrodes 8, 9, and 1 O) was carried out in black in the electrolyte composition: Co04-5H / iO 35 g / l;

 20, g / l; N / G.V04 - P temperature 20 area S of each electrode 15 cm finoTjHocrb alternating current D - 0, O2 A / cm. Counter-electrodes 6 and 7 of copper. (The metoelectrode distance for all data is the same 1O cm). The current on the ammeter 12-O, FOR, on the ammeter 13 - 0.3A, Through the ammeter 11 the current is 0.6 A. Plate

8.9 and 1O evenly painted black. The voltage between the electrodes 9 and 8, 1O is 41.6 b, and the voltage between the electrodes 8, 10 and 6, 7 is 24 V. The power consumed by the electrolyzer is equal to

24 V O.ZA 7.2 W 41.6 V «0, 12.48 W Total: 19.68 W,

Or 19.68 W 6.56 W for one

3

processed electrode, or 0.437 W / / cm, or 4.37 kW / m. When electrochemically machining pre-anodized plates by a known method (i.e., aluminum electrode 9 is replaced with a counter electrode. Of copper, the number of turns of additional winding 4 and 5 is zero) at the same current density (D 0, O2 A / cm) through Ammeter 11 passes 0.6A current. Between the electrodes 8, 10 and 6, 7, 9, a voltage of 24 V is established. The power consumed by the electrolyzer is:

24 V Oh, 6A 14.4 W or 14.4 W W for one of2o.

bathe electrode, or 0.48 W / cm; 4.8 kVg / m

Obviously, the proposed method (as in the example) allows increasing the capacity of the electrolyzer by 1/3 by replacing the copper counter electrode with an aluminum electrode, and the power consumption of the electrolyzer per 1 m of the processed surface of the products is reduced by (4.8 kW 4, 37 kW) О / 43 kW. Energy savings are achieved by reducing the losses on the polarization resistance of the counter electrodes and the resistance of the electrolyte and in proportion to the decrease in the number of counter electrodes,. .

formula of invention

Claims (3)

1, A method for electrochemical testing of products with symmetric alternating current, including the installation of a group of products in a bath between counter electrodes, differently because, in order to increase productivity and save energy, processed products are used as counter electrodes of the middle part of the electrolyzer; 2. The procedure for p. 1 on tl and ch and y1ts and fl with the fact that the process is carried out with paait nbHOM constant current in the current between envlrrodamviadedelv m and will rise mv-41tvvvovkrodamv. 3. A method according to claim 1, about a tl R h and y w and fl so that a current is fed to the opposite electrodes of the additional secondary winding of the transformer, one of which is connected to the one-terminal end of the main secondary current & loggcn. Sources of information technology, take into account during the examination 1. V. A liner. M. and Cupre vpev N. T. Osnovy galvanotetegii, h. P, M, 1946, p. 277, FIG. 126. Lj GU LLLLLALLLLDLLG -O “L o