Addictive for electroplating tin and tin nickel alloy

A tin-nickel alloy and additive technology, applied in the field of electrochemical deposition of metals and alloys, can solve the problems of unstable stannous ions, limited coating performance and application range, and useless plating solutions.

Inactive Publication Date: 2006-07-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this bath is that stannous ions are unstable in this alkaline bath and can be quickly oxidized to tetravalent tin, making the bath useless
Therefore, the alloy coating disclosed above is relatively fixed due to its composition and content, and the performance and application range of the coating are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sodium citrate 25g / L, sodium acetate 6g / L, potassium hydroxide 70g / L were prepared into a solution, then potassium stannate 150g / L, and metal tin 80g / L were added, after sedimentation and filtration, 4mL hydrogen peroxide was added to obtain a solution, and electroplating Get silvery white tin.

Embodiment 2

[0020] Glycine 40g / L is mixed with stannous chloride 20g / L and potassium pyrophosphate 220g / L to form a solution, and then silver-white tin is obtained by electroplating.

Embodiment 3

[0022] Use citric acid 60g / L, malonic acid 8mL / L as additives, and make a solution with stannous chloride 20g / L, potassium pyrophosphate 240g / L, and electroplate to obtain silvery white tin.

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PUM

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Abstract

The additive for electrolytic tin plating and Sn-Ni alloy belongs to the monohydroxy carboxylic acid or hydroxy polycarboxylic acid or polyhydroxy carboxylic acid or polyhydroxy polycarboxylic acid or their alkaline-earth metal, carboxylic acid or polycarboxylic acid or their alkaline-earth metal, non-sulfur amino acid or it alkaline-earth metal, polyamino carboxylic acid or it alkaline-earth metal. Wherein, the dosage is 5-100g for every liter plating solution. This invention can modify plating liquid nature, improves solution stability, and realizes large-scale control to alloy intergradient.

Description

technical field [0001] The invention belongs to the technical field of electrochemical deposition of metals and alloys. In particular, it relates to additives for electroplating tin and tin-nickel alloys. Background technique [0002] The tin coating has good corrosion resistance to the atmosphere, humidity, water-soluble salt solution, weak acid and dilute solutions of sulfuric acid, nitric acid, and hydrochloric acid, and is resistant to organic acids. It can be used as a cheap finishing coating. The tin plating baths that have been used mainly use stannate and strong alkali as the dielectric or tin sulfate salt and phenolsulfonic acid as the dielectric. Alkaline baths based on potassium pyrophosphate and using organic sulfides and peptones as grain refiners are disclosed in US3951750 and US4021316. But the shortcoming of this bath is: stannous ion is unstable in this alkaline bath and can be rapidly oxidized to tetravalent tin and makes ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/32C25D3/60
Inventor 单忠强陈政田建华
Owner TIANJIN UNIV
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