Chemical tinning liquid, preparation method thereof and chemical tinning method

A technology of chemical tin plating and tin salt, applied in the field of chemical plating, can solve problems such as poor stability of chemical tin plating solution, achieve high compactness, ensure long-term stability, and solve the effects of poor stability

Active Publication Date: 2015-07-01
BYD CO LTD
5 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem of poor stability of the chemical tin plating solution existing in the ...
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Method used

By adding sulfonic acid promotor in titanium chloride series reducing agent chemical tin plating solution, the activity and stability of plating solution can be effectively improved, and the long-term stability of plating solution can also be guaranteed simultaneously, make follow-up chemical The electroless tin plating layer formed during plating has high density and bright surface, which solves the technical problems of poor stability of the existing electroless tin plating solution, loose and easy-to-dark coating.
The effect of complexing agent is to prevent Sn2+ from generating Sn(OH)2precipitation under alkaline conditions, which can form stable complexes with Sn2+, while also preventing tin from directly reacting with reducing agent to cause plating solution failure. The complexing agent can adopt various complexing agents commonly used in the prior art. As a preferred embodiment of the present invention, the inventors of the present invention have found through a large number of experiments that a tri-complexing agent system is adopted in the electroless tin plating solution of the present invention, and a sulfonic acid accelerator is used in conjunction with the chemical tin plating solution of the present invention. The tin plating solution can not only be used at low temperature, but also its stability is improved, its activity is strong, and it can also control the progress of the tin plating reaction. Specifically, the tri-complexing agent system is a mix...
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Abstract

The invention provides a chemical tinning liquid and a preparation method thereof. The chemical tinning liquid contains tin salt, a complexing agent, a reducing agent and an accelerant, wherein the reducing agent is titanium dichloride; the accelerant contains sulfoacid accelerant; the sulfoacid accelerant is selected from at least one of A, B and C, wherein A is dedecylseleno sulfonate B is a mixture of dodecyl sulfonate and seleno sulfonate and C is a mixture of dodecyl sulfonate and seleno sulfate. The invention also provides a method for chemical tinning by using the chemical tinning liquid. According to the invention, the sulfoacid accelerant is added into the chemical tinning liquid using the titanium dichloride as the reducing agent, so that the activity and the stability of the chemical tinning liquid are effectively improved, the long-term stability of the tinning liquid is ensured and the compactness and the smoothness of a tin coating are improved.

Application Domain

Liquid/solution decomposition chemical coating

Technology Topic

Dodecylsulfonic acidCompound (substance) +7

Image

  • Chemical tinning liquid, preparation method thereof and chemical tinning method

Examples

  • Experimental program(9)
  • Comparison scheme(2)
  • Effect test(1)

Example Embodiment

[0031] The present invention also provides a method for preparing the electroless tin plating solution, which includes first dissolving the tin salt, complexing agent, and reducing agent in water to prepare respective aqueous solutions, and then mixing the tin salt aqueous solution and the complexing agent aqueous solution first, and then The sulfonic acid accelerator is added, and finally mixed with the reducing agent aqueous solution to obtain the electroless tin plating solution.
[0032] As mentioned earlier, the electroless tin plating solution needs to be in an alkaline environment, so a pH regulator needs to be added to adjust the pH of the system. Preferably, after the components in the electroless tin plating solution are uniformly mixed, a pH regulator can be added to adjust the pH value of the system to 8-10 to obtain the electroless tin plating solution provided by the present invention.
[0033] Finally, the present invention provides an electroless tin plating method, which includes immersing the object to be plated in the electroless tin plating solution provided by the present invention to form a metal tin layer on the surface of the object to be plated. Due to the high activity and good stability of the electroless tin plating solution provided by the invention, the quality of the plating layer can be ensured, so that it has the advantages of high compactness and bright surface layer.

Example Embodiment

[0035] Example 1
[0036] According to the formula, the tin salt, complexing agent, reducing agent titanium chloride, surfactant PEG1000, and thiourea were dissolved in water to prepare their respective aqueous solutions, and then the tin salt aqueous solution and the complexing agent aqueous solution were mixed first, and then the sulfonic acid was added Promoter, stir for 2 minutes and then add other aqueous solutions, and finally add 25wt% ammonia to adjust the pH value of the system to obtain the electroless tin plating solution S1 of this embodiment. Its formula is: stannous sulfate 10g/L, sodium citrate 30g/L, Methanesulfonic acid 20g/L, sulfamic acid 10g/L, potassium dodecylselenosulfonate 3g/L, PEG1000 0.05g/L, thiourea 6g/L, titanium chloride 4g/L, ammonia 7g/ L, pH value is 9.0.

Example Embodiment

[0037] Example 2
[0038] The electroless tin plating solution S2 of this example was prepared by the same method as in Example 1. The formula was: stannous chloride 12g/L, citric acid 40g/L, sodium methanesulfonate 30g/L, and sulfamic acid 12g /L, potassium dodecyl selenosulfonate 4g/L, PEG1000 0.08g/L, thiourea 7g/L, titanium chloride 5g/L, ammonia 9g/L, pH 9.6.
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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Guaranteed long-term stability
  • Improve activity and stability
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