SU604867A1 - Electrolyte for polishing metal surfaces - Google Patents

Description

Table 1

As can be seen from the table. 2, in the proposed electrolyte, all said steels and alloys, including nickel-based alloys, obtained by vacuum-arc melting, are well polished. At the same time, the surface cleanliness is increased due to the smoothing of submicro and microroughness.

The results of polishing polished and pickled samples from alloy VZH-98

Ground Surface Samples

8a

6 in

0.73

0.60

Etched Surface Samples

9v-yua

0.26

0.16

0.42

The microroughness of the surface is determined on a profilometer M-201 profilograph of the plant “Caliber at 7 points of the surface (GOST 2889-73).

table 2

Improving the cleanliness of the electrolyte

“Nimonpk vacuum-arc melting in the electrolyte containing, wt. %: Phosphoric acid

60 20 1.5

Sulfuric acid Sulfoureid Ammonium Nitrate

3.5

: or potassium Water Else

at a current density of 200 A / dm for 2 min are presented in Table. 3

Table 3

23

eleven

20

60

40

4.7

13

46

4.7-4.8

60

20

40

The results of electropolishing of the same samples in the proposed electrolyte with different content of nitrate salts are presented in Table. four.

The data table. 4 shows that the best smoothing of the surface is observed when the content of nitrate salts in the electrolyte is 2-5%. At the same time, the quality of surface treatment practically does not vary with the type of salt used, in connection with which both ammonium nitrate and potassium nitrate or their mixture can be introduced into the electrolyte.

The proposed electrolyte can also be used to polish carbon and stainless steels of austenitic, semi-ferritic and martensitic grades.

Claims (2)

1. Electrolyte for polishing metal surfaces, containing phosphoric acid, sulfuric acid, sulfoureid and water, characterized in that, for the purpose of Table 4 higher than the purity class of nickel-based alloys obtained by vacuum arc melting, it additionally contains salts of nitric acid at the following ratio of components, weight. %: Phosphoric acid50 60 Sulfuric acid20-30 Sulfoureid 1,5 - 2,0 Nitric acid salts2.0-5.0 WaterEverything 2. The electrolyte according to claim 1, characterized in that it contains potassium nitrate or ammonium nitrate or a mixture thereof as salts of nitric acid. Sources of information taken into account in the examination 1. Popilov L. Ya. Electropolishing technologists. M.-L., Maschgiz, 1953, p. 254. 2. USSR author's certificate number 422795, cl. C 25F 3/24, 02.11.70.