SU1613508A1 - Stabilizer of iron-plating electrolyte - Google Patents

Abstract

The invention relates to the electrolytic deposition of iron coatings and can be used in mechanical engineering, aviation industry, repair production for the restoration and strengthening of machine parts, as well as the production of functional coatings. The invention consists in the use of semicarbazid diacetic acid dihydrazite (DSCA) as a stabilizer for ferric chloride electrolytes. The use of DSC allows for a 2-fold increase in the service life of the iron electrolyte and 10 times the corrosion resistance of the iron coatings obtained from it, compared with the iron electrolyte, in which hydrazine is added as a stabilizing additive. 3 tab.

Description

WITH

with

The invention relates to the electrolytic deposition of iron coatings and can be used in mechanical engineering, the aviation industry, in the repair industry for the restoration and strengthening of machine parts, as well as the production of functional coatings.

According to the invention, semicarbazide di-acetic acid dihydrazide is used as a stabilizer of iron electrolyte,

Semicarbaziddiacetic acid dihydrazide (DSCA), having the structural formula;

CH2CONHNH2

H2N.

/

C-NH-N

CH2CONHNH2,

is a white crystalline compound with a mp. 149 ° C, soluble in water, alcohol. Its use for a specific purpose is unknown.

The deposition of iron coatings is carried out from an electrolyte containing: g / l: iron chloride 200 ... 400: hydrochloric acid 0.5-2: dihydrazidsemicarbaziddiuksus-acid 1-2: pH 0.8-1, at 18-20 ° C , current density of 20-30 A / dm.

The electrolyte is prepared by mixing the components, the stabilizer is introduced into the finished electrolyte.

The corrosion resistance of the resulting coatings is determined according to GOST 9 012-73.

The concentration of iron (III) in the solution is determined by the mercumetric method, the pH of the solution is measured using a pH meter.

about

CJ

ate about

00

The results of experimental studies are shown in Table. 1-3.

Table 1 shows the effect of iron electrolyte compositions on the stability of electrolytes and the corrosion resistance of coatings.

Table 2, 3 shows the data on the effect of the concentration of DSCU in the iron electrolyte containing, g / l: iron chloride 400; hydrochloric acid 2.0, - on the properties of coatings and electrolyte.

As can be seen from Tables 1-3, the use of semicarbazid diacetic acid dihydrazide in the iron-making electrolyte allows the concentration of iron (III) in the solution to be minimized with a slight change in acidity in the solution volume

five

deposition process, which gives a high stabilization effect. In addition, the use of a stabilizer leads to an increase in the corrosion resistance of iron coatings 10 times. Compared with hydrazine, the use of DSCs increases the electrolyte service life by a factor of 2, eliminating the technological operation of pre-treating iron electrolyte, which takes 1/3 of the shift time, and reduces energy and material costs.

Claims (1)

Claims of the invention. Use of semicarbazid diacetic acid dihydrazide as a stabilizer of ferric chloride electrolytes. Table 1 table 2 Table 3