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.
CN1804142AInactive Publication Date: 2006-07-19TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2006-07-19
Estimated Expiration
Not applicable · inactive patent
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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.
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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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