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
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chemical tinning liquid, preparation method thereof and chemical tinning method

Examples

Experimental program
Comparison scheme
Effect test

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,...

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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.

Description

technical field [0001] The invention belongs to the field of electroless plating, and in particular relates to an electroless tin plating liquid, a preparation method thereof and an electroless tin plating method. Background technique [0002] In recent years, as a solderable coating, tin coating has been widely used in industries such as electronic components and semiconductor packaging based on copper and copper alloys. In addition, tin coating has also been widely used as a protective coating for copper and copper in water supply systems. Plating of the inner surface of copper alloy tubes. Due to the increasingly serious pollution caused by lead, the application of tin-lead alloy coating is more and more restricted. However, there are not many reports on lead-free solderable tin-based alloy plating technology at home and abroad. Therefore, on general electronic components, tin plating is still the preferred solderable coating. [0003] In terms of plating methods, comp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C18/52
Inventor 韦家亮
Owner BYD CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap