SU1070222A1 - Composition for electrochemical polishing of nickel alloys - Google Patents

Description

The invention relates to electrochemical polishing of metals and alloys, in particular, to electrolytes for polishing nickel alloys, for example NSHF, HM23XY, X20H72UM, 80HXC, SCNMA, 47ND.

Solutions are known for electrochemical polishing of nickel alloys based on sulfuric and / or phosphoric acids with organic additives, for example, L-lysine hydrochloride and glutamic acid hydrochloride SI, block C21 ethylene oxide copolymer.

However, the known solutions are not. provide high quality polishing of the surface of nickel alloys, as a matt surface with low reflectivity is obtained.

Closest to the invention is a solution for electrochemical polishing of alloys containing sulfuric and phosphoric acids with the addition of carboxymethylcellulose and monosodium sulfopalmitate L3}

However, when polishing nickel alloys in this solution, matting is observed on the surface and, in some cases, rasterized surfaces. It is also of limited use due to the absence of the effect of smoothing and brightening the surface when electrochemically polishing heat-treated products with an oxide film.

The purpose of the invention is to increase the purity class and reflectivity of hardened and heat-treated products.

This goal is achieved by the fact that the solution for electrochemical polishing of Nickel-based alloys containing sulfuric and orthophosphoric acids, a surfactant and water, as a surfactant contains a BIO washing paste in the following ratio of components,% by weight:

30- “0

Sulfuric acid

Orthophosphorus

15-50

acid

Washing paste

BIO

0, I05–0.00 “Up to 100

Water

Washing paste BIO has the following composition, wt.%:

Alkyl sudate of primary fatty alcohols 8.0-10.0 Acids of fatty synthetic fractions or 4.0-6.0 Hydroxyethylated fatty alcohols 4.0-6.0 Sodium chloride 3.0-5.0 Sodium carboxymethylcellulose salt 0.5-1 , 0 Sodium tripolyphosphate 10,, 0 Sodium sulfate 0-5.0

Sodium silicate 1.0-1.2 Alkaline proteipase (enzyme) 1.0-2.0

Potassium chloride; 0-3.0 Gelatin1.0-2.0

Bleach 0.1-0.3 Water Up to 100

BIO paste is a pasty-like white substance, well soluble in water and acid without foam formation, produced by the industry according to TU.6-15-1109-7a.

The electropolishing process is carried out “at an electrolyte temperature of 20–50 ° C, an anodic current density of 80–300 A / dm, and a duration of 10 s — 3 min.

The solution is prepared as follows.

Sulfuric acid is poured into the water, after mixing and cooling phosphoric acid is added, then the solution is stirred, cooled and the BIO paste is introduced, after which the solution is thoroughly mixed.

Example. Several electrolytes are prepared, the compositions of which are presented in Table. one.

Table 1

2030

6050

0,0040,005

90

BO

80

50

15

0.007 0.008 0.009 g

Up to 100

Up to 100

Cold-drawn and heat-treated wire f 2.5 mm from HM23YuF HM23HYU, H20N73YUM alloys, cold-drawn ff o wire, 5 mm from 15NU as well as; samples of cold rolled and heat treated tapes from alloys bZNF,. 8UHXC, 81НМА, 47НД, 47НХР, ЗбНХТЮЗМ size SUi20x0,1 mm. The wire is polished when it moves through a bipolar bath at an anodic current density iOO A / dm, the temperature of electrolyte jype is 25 ° C. The polishing time is 1 minute.

Electrochemical polishing of ribbon samples was carried out in a cell with a co-tact current supply at the indicated mode.

Continued table. one

0, E 0.3

Up to 100 up to 100 up to 100

; The surface cleanliness class is determined using a profilograph — a model 201 profilometer in accordance with 20 of GOST 278UG-73.

The metal removal rate is determined by the change in the thickness of the samples with a KSH-6 micrometer as well as by the grating method.

The appearance of the surface is assessed visually, as well as under the microscope MWy-3 for the absence of a rift, matt napet

thirty

The reflectivity is measured using photoelectric brightness; co-morbidum PB-2. The data obtained are presented in Table. 2

; T aj6 faces 2

12 12 12 13

12 11 11 12

V 8 8

8 8 11

7 8

eleven

eleven

9 9

12 12

7 7 8 7

9 8 9 8 8 7 8

11 11 11 11 11 10 10

10 11 11 11 11 11 10

/ 7; 7 6

Continued table. 2

Since the BIO paste contains a complex of various inorganic and organic substances, the influence of organic substances INPUT 51 to the BIO paste / on the electropolishing quality of the 80НХС alloy and alloy wires was studied. 2

Your HM23ÜF in the welded and heat-treated state. The electroplating is carried out at an anodic current density of 100 A / dm, a treatment time of 1 min.

The data obtained are presented in Table. 3 ..

As can be seen from the table. 3, neither the separate nor the co-administration of the surfactant-based Juice Paste BIO allows the invention to be achieved. Only the whole complex of organic and inorganic substances that make up the BIO paste allows an increase in the purity class and the reflectivity of hardened and heat-treated products.

The electrolyte according to the invention can be used for electrocirculation of Nickel alloys, including numerically and heat-treated products from nickel alloys,

The economic effect from the implementation of the invention will be 260 300 thousand rubles per year in one enterprise.

Claims (3)

1. SOLUTION FOR ELECTROCHEMICAL POLISHING OF NICKEL ALLOYS, containing sulfuric and orthophosphoric acids, surfactants and water, characterized in that, in order to increase the class of purity and reflectivity of the surface of the treated and heat-treated products / it contains as a surfactant BIO washing paste in the following ratio of components, May.%: Sulfuric acid 30-80. Phosphoric Acid 15-50 Washing paste BIO 0.005-0.008 Water Up to 100 2. The solution according to claim 1, with respect to the fact that the BIO washing paste has the following composition, May.%: "Alkyl sulfates of primary fatty alcohols Acids fatty synthetic fractions With ₄₀ Sc. or SC-Cs Ethoxylated fatty alcohols Sodium chloride Sodium salt of carboxymethyl cellulose Sodium Tripolyphosphate Sodium sulfate Sodium silicate Alkaline proteipase (enzyme) Potassium chloride Gelatin Bleach water 8.0-10.0 4.0-6.0 4.0-6.0 3.0-5.0 9 0.5-1.0 £ 2 10.0-20.0 I 0-5.0 1.0-1.2 1.0-2.0 2.0-3.0 1.0-2.0 0.1-0.3 UP TO 100> 0>