SU917991A1 - Electrolyte for electrochemical machining of metals and alloys - Google Patents

Description

(5) ELECTROLYTE FOR DIMENSIONAL ELECTROCHEMICAL TREATMENT OF METALS AND ALLOYS

I

The invention relates to the dimensional electrochemical machining of metals and alloys, mainly zirconium and zirconium alloys.

Electrolytes are known for the size-based electrochemical treatment of zirconium based on aqueous solution of sodium perchloride (CACYD) with a concentration of 20–35 op amps of this electrolyte. The performance and the poor quality of the treated surface (black color, traces of etching) are not high enough.

The aim of the invention is to improve the quality of the treated surface while maintaining a sufficiently high productivity for the processing of zirconium and its alloys by increasing the activity of the electrolyte used.

The goal is achieved. using an electrolyte on the basis of an aqueous solution of sodium perchloric acid (NaClO) with the addition to its composition of an additional additive of sodium chloride (NaCl) in the following ratio of components, wt.%:

5 Sodium chlorophosphate Sodium chloride Wate Else

In order to verify the effectiveness of the proposed electrolyte, it was tested in the process of electrochemical treatment of zirconium with a rotating cathode tool, and various concentrations of components in the electrolyte were tested. The conditions of the electrochemical treatment process were within the following limits:

Electro temperature 25 ± 3 С litas, С

20 7.5-9.5

electrolyte pH

Rotation speed

cathode (linear)

m / s30 Working cell voltage, V Interelectrode distance, mm 0.03 Process test results are presented in the table As can be seen from the table, the use of the proposed electrolyte for dimensional zirconium electrochemical processing allows to significantly improve the quality of the treated surface while maintaining a sufficiently high process performance To achieve the indicated surface condition, the anodic value is 15 ay

current density should be at least 25 A / cm. The optimum concentration of sodium chloride was in the range of 5-. With an increase in this concentration over the indicated values, a noticeable decrease in production occurred.

horses in the process of dimensional electrochemical processing. When using the proposed electrolyte on the treated surface, there were no defects, and the roughness R was in the range of 0.3-0.4 microns. 1. performance; At the same time, the use of lower concentrations of choric sodium, close to the content of sodium chloride in the electrolyte indicated in the prototype, is impractical because it results in an unsatisfactory quality of the treated zirconium surface, .. The proposed electrolyte is quite stable under conditions of long-term operation metal in a liter of solution) without adjustment, which contributes to the post-workability indicators

Claims (1)

Claim An electrolyte for dimensional electrochemical processing of metals and alloys, mainly zirconium and zirconium alloys, made on the basis of an aqueous solution of sodium perchloride, characterized in that, in order to improve the quality of the treated surface while maintaining a sufficiently high productivity of the processing process, sodium chloride is introduced into its composition in the following The ratio of Components, wt.%: Sodium Chloride (NaC10 ₄ ) 25-30 Sodium Chloride (NaCl) 5-7 Water The rest. . Sources of information taken into account during the examination 1. US patent 4 ’3669858, CL. In 23 p 1/00, 1972 (prototype). VNIIIPI Order 1977/14 Circulation 1151 Subscription Branch of PPP Patent Uzhhorod, st. Project, 4