SU1139586A1 - Electrolyte for electrochemical machining of titanium and its alloys - Google Patents

Abstract

ELECTROLYTE FOR ELECTROCHEMICAL TREATMENT OF TITANIUM AND ITS ALLOYS, including alkali metal chloride and fluoride-containing component, characterized in that it contains sodium chloride to improve the quality of the surface to be treated and localize capacity, as well as to improve the process performance while maintaining high current output values. and in the quality of the phosphorus-containing component, potassium boron fluoride in the following ratio, wt.%: Sodium chloride 5-10 Potassium borfort 1.0-2.5 WaterOther

Description

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The invention relates to electrophysical and electrochemical methods of metal processing and can be used in electrochemical shaping, piercing, trepanation of large-sized complex-shaped products made of titanium and its alloys of the VTZ-1, TS-5 type, for example, for electrochemical processing of large-size turbine blades at low anode density current (1 -10 A / cm). Known electrolyte containing potassium chloride and fluoride (sodium) and potassium nitrite, in the following ratio, wt.%:

Potassium chloride 10-11

Potassium Nitrite 2.5-2.7

Sodium fluoride 0.50-0.55

WaterEverything

However, this electrolyte does not allow to obtain a satisfactory quality of the treated surface (the surface is matt-sulfur, uneven). Its localizing ability is not high enough (the magnitude of the logarithmic scattering index (LIR) is 1.11). The specific removal rate is relatively small and amounts to 9.4 - 10 s.

The purpose of the invention is to improve the quality of the treated surface and localization capacity, as well as to increase the productivity of the process.

This goal is achieved by using sodium chloride as the alkali metal salt in the electrolyte, and potassium boron fluoride as the fluorine-containing component in the following ratio, wt.%:

Sodium Chloride 5-10

Potassium boron fluoride 1.0-2.5

WaterEverything

О For the preparation of the electrolyte, the following salts are used: sodium chloride, brand x.h. GOST 4133-66, potassium boron fluoride grade h. GOST 9532-60.

The electrolyte is prepared as follows.

Potassium boron fluoride is dissolved in hot water (70-90 ° C), then sodium chloride is added to the resulting solution. The resulting solution is cooled to room temperature.

0 The tests of the proposed electrolyte were carried out on electrodes of alloy TC-5 on a cell with an intensive flow of electrolyte. The processing mode is as follows: voltage at 12 V electrodes; electrolyte temperature 25 ° С; 0.3 mm interelectrode gap; electrolyte flow rate of 8 m / s.

The data of comparative testing of known, and proposed electrolytes are given in the table.

: potassium chloride 10.5 potassium nitrate 2,6 sodium fluoride 0,525 water the rest

The proposed sodium chloride 7.5 potassium boron fluoride 1, 75

water the rest

The proposed electrolyte helps to obtain a high-quality surface during the electrochemical treatment (shiny, smooth, without pitting surface), but in a known electrolyte, the surface is dull, uneven. The localizing ability of the proposed electrolyte is higher than that of the known-N

9.4-10

1.11 90-105 Matt Seru uneven

1,090-115 Brilliant schA smooth, almost without pitting

leg (LIR is 1.0 versus 1.11). The value of the anode current output during processing in the proposed electrolyte is slightly higher (90-115 vs. 90-105%), 55 than in the known. The processing capacity (given for an interelectrode gap of 0.3 mm with an anode current density of 14 A / cm) in the proposed electrolyte is 1.5 times higher than 15, opposite to current and productivity to get 9.4, 4 KU s) than that of the known. high quality surface finish

The proposed electrolyte is simple in terms of soy-it is simple to prepare, it is also available to the state, it makes it possible at high yields in time.

1139586

with high localization ability

Claims (1)

ELECTROLYTE FOR ELECTROCHEMICAL TREATMENT OF TITANIUM AND ITS ALLOYS, including alkali metal chloride and fluoride-containing component, characterized in that, in order to improve the quality of the processed surface and localization ability, as well as to increase the productivity of the process while maintaining high current yields, it contains sodium chloride, and in the quality of the phosphorus-containing component is potassium borofluoride in the following ratio of components, wt.%: Sodium chloride 5-10 Potassium borofluoride 1.0-2.5 Water Rest GO C © SP oo