SU908973A1 - Electrochemical polishing solution for iron and nickel alloys - Google Patents

Description

(5) SOLUTION FOR ELECTROCHEMICAL POLISHING IRON-NICKEL ALLOYS

I

The invention relates to the electrochemical machining of metals, in particular, to the polishing of iron-nickel alloys of the type 52H-VI, 50H, i2H, D6H, etc.

Most closely related to the proposed solution is the well-known electrochemical polishing solution for iron-nickel alloys containing orthophosphoric acid, a polyoxyalkylated monoethanolamine-based surfactant, for example, ethylene oxide and propylene block copolymer with monoethanolamine and water. 1J.

However, the use of the above substance as a surfactant leads to significant foaming, which impedes the work of the solution in the circulation baths and the removal of the surfactant with foam, and also leads to the heating of the solution, which causes dissolution

the metal being processed and its accumulation in the working solution, which, in turn, does not ensure an adequate service life of the solution ..

The purpose of the invention is to increase the service life of the solution.

This goal is achieved by

10 that a solution containing orthophosphoric acid, a polyoxyalkylated monoethanolamine surfactant and water, as a surfactant

5% based on polyoxyalkylated monoethanolamine contains polyoxypropylated monoethanolamine in the following ratio of components, weight:

20

Orthophosphoric acid 70-80 Polyoxypropylated monoethanolamine 0.01-0.05 Water Remaining 3 Polyoxypropylated monoethanolamine is non-ionic

H (

N-СНг- СНг- О - (CjHsOJmH

v. HiOHgCsjm

where m is 15-20.

The solution is prepared by introducing the surfactant into an aqueous solution of phosphoric acid.

The polishing process is carried out at 25-55 ° C, anodic current density of 100300 A / dm for 0.5-1 min. Increasing and decreasing the concentrations of the components in this solution against the optimum leads to a deterioration in the quality of the surface treatment, and its concentration is observed.

Phosphoric acid

Polyoxypropylated monoethanolamine Block copolymer of ethylene oxide and propylene

Water

Initial temperature, C

2

Current density A / dm

Duration, min

Wire speed, m / min

Surface cleanliness class Notes

The table gives a comparative description of the proposed and known solutions.

Thus, in the proposed solution, there is practically no foaming, the service life increases by 1.3-1.5 pasa, heating it by 0-50 ° C less than the known one. The proposed solution is simple to prepare, does not require special neutralization, as the addition of surfactant is biologically mild.

70

80

75

0.05

0.03

0.01

29.95 24.97 19.99 25 25 25 200 200 200

1.5

1.5

, 5 9089734 surfactant and. has the formula Pol11oning carried out on a wire from the alloy 52H-VI 00.2-1, 3 mm, the heating of the solution is determined by the difference in temperature of the solution before and after polishing.

5 908973.

Claims (1)

The invention claims polyoxypropyl monoethanol Solution for electrochemical components, weight: polishing of iron-nickel splo-orthophosphoric acid 70-80 bov, containing orthophosphoric acid-polyoxypropylated, a surfactant monoethanolamine 0.01-0.05 based on polyoxyalkylated water; , ° taken into account in the examination as a surfactant polyoxyalkyl-1 based substances. USSR author's certificate bath monoethanolamine it containsN8, CL. C 25 F 3/16 1978. amine in the following ratio