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Sulfonic acid type semi-bright pure-tin electroplating liquid

A tin electroplating, sulfonic acid type technology, applied in the field of sulfonic acid type semi-bright pure tin electroplating solution, can solve the problems of high cost of fluoroborate tin plating solution, poor dispersibility of the plating solution, easy hydrolysis of divalent tin, etc. Achieve high production efficiency, fast deposition speed and good dispersion.

Inactive Publication Date: 2015-11-18
WUXI QIAOYANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of fluoroborate tin plating solution is higher than that of sulfate plating solution, and there are also disadvantages such as fluoride pollution, so it is hardly used at present
The methanesulfonic acid system is applied to continuous electroplating production due to its high deposition rate and easy wastewater treatment. However, most of the plating solutions currently used have poor dispersion ability and divalent tin is easy to hydrolyze.
Recently, a semi-bright pure tin electroplating solution based on a sulfonic acid system has been disclosed in China. It is characterized in that it can be operated in the weak acid range, and the pH value is between 0.5 and 6.5; the stability of the plating solution and the performance of the coating are good, but there are problems due to operation Defects of relatively low plating speed caused by low temperature and current density

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] The sulfonic acid type semi-bright pure tin electroplating solution of this implementation comprises the component of following concentration:

[0024]

[0025] Stabilizers include components at the following concentrations:

[0026] Ethanol 2.5mol / L;

[0027] Sodium sulfite 3.0mol / L;

[0028] Ferrous sulfate 0.5mol / L.

[0029] The brightener is β-naphthol ethoxylate, the lubricant is nonylphenol polyoxyethylene ether NP series, and the lubricant is specifically one of NP-10, NP-12, NP-40 or a mixture of at least two , such as NP-10, the grain refiner is coconut oil fatty alcohol polyoxyethylene ether.

[0030] The sulfonic acid type semi-bright pure tin electroplating solution of the above-mentioned embodiment adopts tin protosulfonate as the main salt, and the synergistic effect of brightener, stabilizer, alkylsulfonic acid, wetting agent, grain refiner and other components The components in the sulfonic acid type semi-bright pure tin electroplating solution ha...

Embodiment 2

[0032] The sulfonic acid type semi-bright pure tin electroplating solution of this implementation comprises the component of following concentration:

[0033]

[0034] Described stabilizer comprises the component of following concentration:

[0035] Ethanol 3mol / L;

[0036] Sodium sulfite 4mol / L;

[0037] Ferrous sulfate 1mol / L

[0038] The selection of brightener, lubricant and grain refiner in this embodiment refers to Example 1.

Embodiment 3

[0040] The sulfonic acid type semi-bright pure tin electroplating solution of this implementation comprises the component of following concentration:

[0041]

[0042]

[0043] Described stabilizer comprises the component of following concentration:

[0044] Ethanol 4mol / L;

[0045] Sodium sulfite 5.0mol / L;

[0046] Ferrous sulfate 1.5mol / L.

[0047] The selection of brightener, lubricant and grain refiner in this embodiment refers to Example 1.

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Abstract

Sulfonic acid type semi-bright pure-tin electroplating liquid comprises methanesulfonic acid with the concentration being 100-120g / L, tin methane sulfonate with the concentration being 200-250g / L, a brightener with the concentration being 2-8g / L, a stabilizer with the concentration being 5-10g / L, a lubricant with the concentration being 10-15g / L and a grain refiner with the concentration being 2-5g / L. The stabilizer comprises ethyl alcohol with the concentration being 2.5-4 mol / L, sodium sulfite with the concentration being 3.0-5.0 mol / L and ferrous sulfate with the concentration being 0.5-1.5 mol / L. According to the semi-bright pure-tin electroplating liquid, alkyl stannous sulfonate is adopted as main salt, and the sulfonic acid type semi-bright pure-tin electroplating liquid is high in dispersing capacity, stable and efficient under the cooperative effect of the brightener, the stabilizer, alkyl sulfonate, a wetting agent, the grain refiner and other components.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, in particular to a sulfonic acid type semi-bright pure tin electroplating solution. Background technique [0002] Tin coating has good stability, strong corrosion resistance and discoloration resistance, non-toxic, soft coating, good solderability and ductility, so it is widely used in industry. In order to prevent eye fatigue of operators or users, it is popular to use low-reflective or non-reflective coating and surface decoration processes. Different from bright tin plating, this type of tin plating is called semi-bright tin plating, or matte tin plating process, and the resulting coating is called semi-bright tin or dumb tin, matte tin. The semi-bright tin plating additive is single and simple, and the plating solution is easy to manage. It can refine the crystallization of the plating layer and improve the dispersion ability, but it does not make the plating layer bright. This pr...

Claims

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Application Information

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IPC IPC(8): C25D3/32
Inventor 沈秋
Owner WUXI QIAOYANG MACHINERY MFG
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