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A kind of pcb board silver electroplating solution containing compound sulfonate brightener

A PCB board and sulfonate technology, which is applied in the manufacture of printed circuits, electrical components, printed circuits, etc., can solve the problems of unstable plating solution, poor tin wetting ability, good soldering performance, etc.

Active Publication Date: 2021-08-24
FOSHAN RENCHANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

② Good welding performance, high solder joint strength, fast welding speed, good solder joint brightness, compared with cyanide silver plating, the effect is the same, but the tin wettability is slightly worse
[0009] However, the above-mentioned silver plating system is complicated, and there are usually other organic systems besides the brightener, which makes the plating solution unstable and easy to decompose.

Method used

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  • A kind of pcb board silver electroplating solution containing compound sulfonate brightener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Configure the plating solution:

[0033] (1) 45g silver nitrate is dissolved in deionized water,

[0034] (2) Dissolve 150g potassium thiosulfate and 55g potassium metabisulfite in deionized water in another container, and stir;

[0035] (3) Compound sulfonate brightener, benzothiazolyl-S-(CH 2 ) 3 -SO3 Na: (CH3) 2 -N-C(=S)-S-(CH 2 ) 3 -SO 3 Na=3:1, the total amount is 400ppm, and dissolved in deionized water;

[0036] (4) the brightener solution of step 3 is mixed with the solution of step 2;

[0037] (5) Add the solution obtained in step 4 to step 1 under ultrasonic enhancement;

[0038] (6) According to the concentration of the aforementioned formula, add the remaining amount of deionized water to constant volume, and add sodium hydroxide to adjust the pH value to 9.5-10.5, and let it stand for use.

[0039] 2. Plating process:

[0040] After degreasing and cleaning the PCB board, put it into the plating solution with a current density of 10A / dm 2 . , ...

Embodiment 2-3

[0041] Examples 2-3, see Table 1 for specific parameters. Other processes are the same as in Example 1.

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Abstract

The invention relates to a PCB silver electroplating solution containing a compound sulfonate brightener, which contains: silver nitrate 45-55g / L, potassium thiosulfate 150-240g / L, potassium pyrosulfite 55-80g / L, A compound sulfonate brightener, the compound sulfonate brightener is divided into two components, A and B, wherein component A is sodium sulfonate containing benzothiazole end groups, and component B is sodium sulfonate containing ‑N ‑C(=S)‑S‑group sulfonate, the invention creatively adopts a combination of brighteners with specific groups, which significantly improves the surface gloss and cooperates with cyanide-free system silver plating in circuit boards. applicability.

Description

technical field [0001] The invention relates to a printed circuit board (PCB), in particular to a PCB silver electroplating solution containing a compound sulfonate brightener. Background technique [0002] With the development of communication technology and the development of a new generation of communication technology, the demand for printed circuit boards has become more and more stringent. Although the traditional pattern of electroplating printed circuit boards dominated by copper has not been broken, it is important for Some high-precision modules with special needs require higher conductivity and stability, so there is still room for improvement in PCB silver plating. Electroplating has not been able to provide a stable supply in the PCB industry. [0003] Chinese invention patent CN105063700A discloses a low-cost, simple and controllable process for electroplating silver on the surface of a printed circuit board with pulse current. The method comprises: (1) prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/46C25D7/00H05K3/18
CPCC25D3/46C25D7/00H05K3/188
Inventor 李爱芝
Owner FOSHAN RENCHANG TECH
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