SU1675388A1 - Method of cleaning products - Google Patents

Abstract

The invention relates to the chemical treatment of a metal surface, in particular, to methods of cleaning parts primarily from the noble metals from glass and ceramics. The purpose of the invention is to increase the cleaning efficiency and reduce the processing time. The method is carried out by processing the elements in an etching solution containing May % potassium bifluoride 053 boric acid 0 5 2 hydrofluoric acid the rest when exposed to ultrasonic vibrations at a frequency of 18–22 kHz, followed by washing and drying Increasing the effect vnosti purification and reduction of processing time is achieved by ispolchotni said solution at 40 to 70 ° L Table 1

Description

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WITH

The invention relates to the chemical treatment of a metal surface, in particular, to methods for cleaning parts mainly from alloys of noble metals from glass and ceramics.

The purpose of the invention is to increase the cleaning efficiency and reduce the processing time.

The method of cleaning parts from alloys of noble metals from glass and ceramics includes processing in an etching solution containing, in wt.%

Potassium bifluoride 0.5-3.0

Borna acid 0,5-2.0

Hydrofluoric acid Rest heated to 40–70 ° C when exposed to ultrasound at a frequency of 18–22 kHz, followed by washing and drying

EXAMPLE 1 The removal of dismantled glass melting vessels from the noble PtPdRu 35-0 1 alloy from glass and ceramics is carried out in a bath made of vinyl plastic. The parts are filled with hydrofluoric kiglotte, added with 1.0% of boric acid and 2.5 May% of potassium bifluoride and exposed to ultrasound with a frequency of 18 kHz using a PMS vibrator for one hour at 60 ° D, the parts are taken out of the bath, pour out of the bath, then tap and then distilled water and dried in a drying cabinet

Loading density 2 5.1 m of the treated surface per liter of solution; The degree of cleaning parts from glass and ceramics is determined visually and under a microscope MBS-1

The compositions of the tested solutions, the process conditions as well as the comparative results of testing known and proposed methods are presented in the table.

Analysis of the experimental data shows that the proposed method ensures the cleaning of the surface of parts from

about 1 cl

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glass and ceramics (examples 1 - 3.8 and 9). When the content of one of the components in the etching solution is lower than that proposed (examples 4 and 10), and especially in the absence of one of the components in the etching solution (examples b and 7), the samples remain uncleaned from glass and ceramics. When the content of potassium bifluoride or boric acid in the pickling solution is higher than the suggested amount, the samples are cleaned normally, but later on when the metal is smelted, abundant gassing is observed associated with increased sorption of these components (examples 5 and 11).

Cleaning the surface of alloys of noble metals from glass and ceramics by the proposed method, but in the absence of an ultrasonic floor does not go (example 12) - glass and ceramics remain on the samples. When cleaning is carried out at a temperature below the proposed cleaning, the cleaning proceeds poorly (Example 13), and during further smelting of the metal, an increased gassing is observed due to the adsorption of the components of the pickling solution on glass and ceramics. When cleaning is performed at a temperature higher than that offered (example 14), the metal from glass and ceramics is cleaned well, but on 30-10-0, 1-0.1

3PC Rh 10

4Ft Pd Ru 35-0,

5Рч Pd R.I 35-0,1

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u 35-0,1

costly)

0.5 3.0 0.2

3.5 2, j 2.5

1 D 1, C

An abundant gassing from the pickling solution begins.

By reducing the etching capacity of the solution in the proposed method, it can be reused 5-6 times, and an additional 2-3% by weight of potassium bifluoride is added each time.

Claims (1)

Thus, the proposed method allows you to quickly and efficiently clean the surface of the alloys of noble metaplates from glass and ceramics, and further re-melting of the purified metal significantly reduces gas release. Claims The method of cleaning parts is mainly from alloys of noble metals or glass and ceramics by processing in a heated pickling solution when exposed to ultrasonic vibrations at a frequency of 18-22 kHz, followed by washing and drying, characterized in that. in order to increase the cleaning efficiency and reduce the processing time, a solution containing, in May,% is used as an etching solution: Potassium bifluoride 0.5-3.0 Borna acid 0,5-2,0 Hydrofluoric acid The rest of the process is carried out at 40-70 ° C.