Electrolytic tinning annexing agent

An additive and electroplating tin technology, applied in the field of electroplating tin additives, can solve the problems of large porosity, easy turbidity of tin plating, poor dispersibility, etc., and achieves the effect of refining the crystallization of the coating, stable properties of the plating solution and good uniformity

Inactive Publication Date: 2015-10-21
吕小方
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many problems in pure tin electroplating, such as poor dispersion, large porosity, easy to change color in the air, easy to burn, easy to turbid tin plating, and tin whisker growth, etc., which affect the overall coating resistance of the product. corrosion performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An electroplating tin additive is composed of the following ingredients: stannous methanesulfonate 25g / l, methanesulfonic acid 90g / l, stabilizer 15g / l, brightener 10g / l, polyacrylamide and polychlorinated Aluminum 15g / l, rare earth additive 3g / l, the rest is deionized water, just stir well.

Embodiment 2

[0022] An electroplating tin additive is composed of the following ingredients: stannous methanesulfonate 30g / l, methanesulfonic acid 100g / l, stabilizer 18g / l, brightener 12g / l, polyacrylamide and polychlorinated Aluminum 20g / l, rare earth additive 5g / l, the rest is deionized water, just stir well.

[0023] This embodiment is the best implementation mode.

Embodiment 3

[0025] An electroplating tin additive, which is composed of the following ingredients: 55g / l stannous methanesulfonate, 140g / l methanesulfonic acid, 20g / l stabilizer, 15g / l brightener, polyacrylamide and polymerized chlorine Aluminum 25g / l, rare earth additive 8g / l, the rest is deionized water, just stir well.

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PUM

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Abstract

The invention belongs to the technical field of chemical tinning, in particular to an electrolytic tinning annexing agent. The electrolytic tinning annexing agent is formed by matching of following ingredients. The ingredients comprise 25-55 g/l of tin methanesulfonate, 90-140 g/l of methanesulfonic acid, 15-20 g/l of a stabilizing agent, 10-15 g/l of brightening agent, 15-25 g/l of polyacrylamide and aluminium polychlorid, 3-8 g/l of a rare earth annexing agent and the balance deionized water. The electrolytic tinning annexing agent has the advantages that the plating solution property is stable, a plating solution can be maintained to be clear and free of turbidity, a cladding layer crystal is refining, the brightness area is large, the evenness is good, lead does not exist, and the environment is further protected.

Description

technical field [0001] The invention belongs to the technical field of electroless tin plating, and in particular relates to an electrolytic tin plating additive. Background technique [0002] Early electronic packaging and electronic circuit boards used tin-lead alloys as solderable coatings, which have the characteristics of low-temperature soldering, good bonding force, and no tin whiskers. In recent years, human beings have paid more and more attention to health and environmental issues. European countries have successively promulgated the RoHS directive and WEEE directive. Lead-free, so it is imperative to study the environment-friendly electroplating process. [0003] However, there are many problems in pure tin electroplating, such as poor dispersion, large porosity, easy to change color in the air, easy to burn, easy to turbid tin plating, and tin whisker growth, etc., which affect the overall coating resistance of the product. corrosion performance. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/30C25D3/32
Inventor 吕小方
Owner 吕小方
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