SU1689442A1 - Method for adjustment of additives in electrolyte composition for electroplating tin-copper alloy - Google Patents

Description

The invention relates to electroplating, in particular to methods of adjusting for the addition of electrolyte for electrodeposition of a tin-copper alloy. The purpose of the invention is to increase the service life of the electrolyte and reduce the complexity of the invention. The invention relates to electroplating, in particular, to methods for correcting the content of additives in the electrolyte for electrodeposition of a tin-copper alloy.

The purpose of the invention is to increase the service life of the electrolyte and reduce the complexity of the adjustment process.

The additive solution is prepared as follows. The calculated amount of sodium sulfite is dissolved in distilled water at 40-50 ° C, then a 1-phenylpyrazolido process is introduced into this solution. The method consists in carrying out the correction for all additives simultaneously by introducing directly into the working bath at room temperature an aqueous solution of additives containing 1-phenylpyrazolidone-3, sodium sulphite and hexamethylenetetraamine in a ratio proportional to their content in the electrolyte and equal to 1:25:20, and A solution of additives is prepared by successively dissolving in batches of sodium sulfite, 1-phenylpyrazolidone-3 and hexamethylene tetrazmine at 40 ~ 50 ° C in distilled water. The increase in the service life of the element is achieved by slowing down the rate of oxidation of tin (I) with oxygen in the air by eliminating heating, mixing, pumping and filtration of the electrolyte. The same factors and an increase in the rate of dissolution of the components of the correction mixture by reducing the complexity of the correction process due to the proposed dissolution sequence. 1 tab.

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with

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on-3 and stirred until complete dissolution within 3-5 minutes. Hexamethylene tetraamine is added last. The volume is adjusted with distilled water to 1 l.

Use for dissolving 1-phenylpyrazolidone-3 solution of sodium sulfite, and not distilled water allows Bo to first, reduce the time of dissolution to a few minutes, and secondly, protect 1-phenylpyrazolidone-3 from oxidation by air oxygen as during θ

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1689442

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preparing a correction solution, and during its subsequent storage.

An aqueous solution of additives containing 1 -phenyl pyrazole Ido n-3 (sodium sulphide and hexamethylenetetraamine in a ratio proportional to their content in the electrolyte, and equal to 1:25:20, is introduced directly into the working bath with electrolyte for deposition of tin-copper alloy at room temperature as necessary to adjust.

The elimination of heating, vigorous mixing, pumping, and filtering the electrolyte solution during the correction process reduces the complexity of the process and simultaneously slows down the oxidation rate of tin (II) with atmospheric oxygen, i.e. increase the life of the electrolyte,

The prepared aqueous solution of the addition is retained for 5–7 months.

The electrolyte, adjusted for additives, has the composition, g / l: tin chloride (I!) 40; copper chloride (I!) 45; potassium pyrophosphate 450; 2 1-feiylpyrazolidone-W 0.1; sodium sulfite 2.5; hexamethylenetetraamine 2.0. Operating temperature 18-22 ° C, pH 8.2-8.4.

The table shows the results of adjusting the content of additives in electrolit by the known and proposed methods.

The increase in the content of components in the corrective solution above those indicated in example 3 is difficult due to the limited solubility of 1-phenylpyrazolidone-3 and sodium sulfite, which leads to their crystallization during long-term storage of the solution or lowering the temperature of the solution. In addition, reduced 4

the stability of the solution during storage due to increased oxidation of 1-phenylpyrazolidone-3. With a decrease in the content of components in the correction solution below> specified in example 1, the volume of solution introduced into the electrolyte during correction is increased, which leads to unacceptably large dilution of the electrolyte.

As can be seen from the table, the proposed 0 method reduces the laboriousness of the correction process by 90 times, as compared with the known, and increases the service life of the electrolyte by 40%.

The use of the technical solution 5 simplifies the maintenance of the electrolyte, makes it possible to make the tin-copper coating process commercially suitable, suitable for long-term use in the conditions of the production workshop.

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Claims (1)

Claim The method of adjusting the composition of the electrolyte for electrodeposition of the tin-copper alloy, including the introduction of 1-phenylpyrazolidone-3 in 5 electrolyte; sodium sulfite and hexamethylenetetramine, characterized in that, in order to increase the service life of the electrolyte and reduce the laboriousness of the process, adjustments are carried out to> these additives at the same time by introducing directly into the working bath at room temperature an aqueous solution containing additives in a ratio proportional to their content , and equal to 1:25:20, and the solution of additives is prepared by successive dissolution of sodium sulfite, 1-phenylpyrazolidone-3 and hex in 40–50 ° C in distilled hearth self-centered0 ramina. Components of the correction solution and process parameters The content of the components, g / l, and indicators parameters for example Famous one 2 3 1-Phenyl pyrazolidone-3 0.1 2 four ten Sodium sulphite 2.5 50 100 250 Hexamethylenetetraamine 2.0 40 80 200 Water l - Up to 1 Up to 1 Up to 1 Correction is carried out Electrolyte temperature, ° C. Stirring Filtration after correction In spare capacity 40-50 Intense Required Directly in the working bath Room Moderate Not required Total correction time, min Zh 2 ² 2 Resilience races | tvora, month ⁶ five four five 1689442 6 Table continuation Components of the correction solution and process parameters The content of the components, g / l, and indicators parameters for example Famous one 2 3 The volume of solution introduced during the preparation, ml / l Additives are administered as dry batches in separate portions of electrolyte 50 25 ten The volume of solution entered during the adjustment, ml / l Supplements are administered as hang in separate portions electrolyte 5.0 2.5 1.0 Error in losing 1 drop of correction solution (0.05 ml). % one 2 five Dilution of the electrolyte during the adjustment (after 10 adjustments),% five 2.5 one Electrolyte service life, months 2.5 3.5 3.5 3.5 A, h / l 55 77 77 77