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Electrotinning additive

An additive and electro-tinning technology, which is applied in the field of electro-tinning additives, can solve the problems of easy turbidity, large porosity, and poor dispersion of tin plating, and achieve the effects of stable plating solution properties, fine crystallization of the coating, and good uniformity

Inactive Publication Date: 2019-05-21
丹阳市中润检测技术有限公司
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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, and specifically relates to an electrotinning additive. The electrotinning additive per liter is prepared through the following components based on ratio: 25-55 g of tin methane sulfonate, 90-140 g of methanesulfonic acid, 15-20 g of a stabilizer, 10-15 g of a brightener, 15-25 g of polyacrylamide and aluminum polychlorid, 3-8 g ofa rare earth additive, and the balance deionized water. The electrotinning additive has the beneficial effects that the electrotinning liquid is stable in performance and can be kept clear and is notturbid for a long time; electrotinning layer crystals are refined, a bright area is large, and the uniformity is high; and lead is avoided, so that the environment friendliness is achieved.

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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IPC IPC(8): C25D3/30
Inventor 魏倩
Owner 丹阳市中润检测技术有限公司