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Method for adjusting bivalent tin ion concentration

A technology of divalent tin ion and adjustment method, which is applied in the direction of cells, electrolysis process, electrolysis components, etc., can solve the problems of long cycle, difficult preparation and adjustment of divalent tin ions, etc., so as to achieve short cycle and shorten the preparation and adjustment of bath solution. cycle, the effect of improving surface quality

Inactive Publication Date: 2016-03-23
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for adjusting the concentration of divalent tin ions that is easy to operate and has a short cycle, so as to solve the technical problems of difficult preparation and adjustment of divalent tin ions in acidic tin plating bath and long cycle

Method used

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  • Method for adjusting bivalent tin ion concentration

Examples

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Effect test

Embodiment 1

[0027] Embodiment 1: Bath solution preparation

[0028] Carry out the preparation of acidic tin plating bath according to the above method, the preparation time is shortened from the original 7 days to the present 3 days, the tin ion concentration reaches the 50g / l of process requirements from 0, the bath has no sediment, no impurities, no need to filter and Parts can be directly produced by electrolysis, and the tinned parts produced meet the process requirements.

Embodiment 2

[0029] Example 2: bath maintenance

[0030] Adjust the tin ion concentration of the acidic tin plating bath according to the above method. The tin ion concentration reaches the 50g / l required by the process from 30g / l. The bath has no deposits and impurities, and the parts can be directly produced without filtration and electrolysis. And the tin-plated parts produced meet the process requirements.

Embodiment 3

[0031] Example 3: bath maintenance

[0032] Carry out the adjustment of the tin ion concentration of the acidic tin plating bath according to the above method, the tin ion concentration reaches the 48g / l required by the process from 35g / l, the bath has no deposits and impurities, and the parts can be directly produced without filtering and electrolysis. And the tin-plated parts produced meet the process requirements.

[0033] The result of the embodiment shows that the present invention can be applied to the preparation and maintenance of the acidic tin plating bath, which greatly shortens the cycle and improves the surface quality of the tin plating layer of parts.

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Abstract

The invention relates to the field of surface treatment and electroplating, and specifically relates to a method for adjusting the concentration of bivalent tin ions used for an acidic tin-plating bath solution. The method is characterized in that an electrolyzing method is carried out; a tin anode plate is used as an anode, and a cathode device is used as a cathode, thus forming a tin plating device for electroplating; the cathode device has the electric conducting effect through which the electroplating process can be carried out normally; the cathode device has the property that a tin plating layer is not deposited, so that bivalent tin ions generated by anode electrolyzing can be directly mixed into the bath solution; the cathode device comprises a built-in cathode, an electric conducting wire, an insulation device and an electric conducting solution; an opening in the upper end of the insulation device is exposed from the outer surface, and the electric conducting solution is stored in the insulation device; one end of the built-in cathode is inserted into the electric conducting solution while the other end of the built-in cathode is connected to a power supply through the electric conducting wire. According to the method, the electrolyzing method is adopted, and the special cathode device is arranged, so that the technical problem of difficult preparing and adjusting of the acidic tin-plating bath solution can be solved, the surface quality of a part can be greatly improved, and the preparation and adjusting cycle of the bath solution can be reduced.

Description

technical field [0001] The invention relates to the field of surface treatment and electroplating, in particular to a method for adjusting the divalent tin ion concentration of an acidic tin plating bath. Background technique [0002] Tin plating is divided into two processes: acid tin plating and alkaline tin plating, and the acid tin plating process is more commonly used. The main components of the acidic tin plating bath are stannous sulfate, sulfuric acid, gelatin, phenol, etc. When preparing or adjusting, due to the low solubility of the main salt, stannous sulfate, it cannot be completely dissolved in water, and the addition of stannous sulfate often occurs. The amount of medicine is enough, but the concentration of divalent tin ions is not enough after the test. It needs to add medicine many times to meet the process requirements, which makes the preparation and adjustment of the bath solution very difficult. Moreover, due to the incomplete dissolution of stannous su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/30C25D21/18
CPCC25D3/30C25D21/18
Inventor 李庆春滕志强孙士江刘莉黄义辉
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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