A kind of preparation method of dinitrosodiammine platinum

A technology of nitrosodiammine platinum and dichlorotetraammine platinum, which is applied in the direction of nitrous acid, chemical instruments and methods, ammonium nitrate, etc., can solve the problem of large potassium ion content, unsatisfactory electroplating effect, and the influence of coating stress Major and other issues
CN102285693AInactive Publication Date: 2011-12-21陕西瑞科新材料股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
陕西瑞科新材料股份有限公司
Publication Date
2011-12-21
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention discloses a preparation method of noble metal compound dinitrosodiammine platinum [Pt(NH3)2(NO2)2] used in the process of cyanide-free electroplating and platinum plating. Chloroplatinic acid and hydrazine hydrochloride are used as a reducing agent to reduce chloroplatinic acid to chloroplatinous acid, prepare dichlorotetraammonium platinum by a one-pot method, and then react with excess sodium nitrite to obtain dinitrosodiammine platinum. The invention accurately reduces chloroplatinic acid to chloroplatinous acid, and then prepares dichlorotetraammonium platinum by one-pot cooking method, and further reacts with sodium nitrite to prepare P salt, which effectively solves the excessive potassium ion content of P salt in the traditional preparation method The problem. The elemental analysis of the P salt prepared by the invention is basically consistent with the theoretical value, does not contain potassium ions, and the contents of sodium ions and chloride ions are both lower than 50PPM.
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Description

Technical field:

[0001] The invention relates to a preparation method of noble metal compound dinitrosodiammine platinum [Pt(NH3)2(NO2)2] used in the process of cyanide-free electroplating and platinum plating. Background technique:

[0002] Dinitrosodiammine platinum [Pt(NH3)2(NO2)2], commonly known as P salt, is mainly used for platinum plating in cyanide-free electroplating. The resulting coating has high hardness and low resistance and can be welded; the surface of electronic components is plated with platinum . The usual preparation method is: metal platinum aqua regia is dissolved to prepare chloroplatinic acid, chloroplatinic acid and potassium chloride are respectively made into a 10% solution, then the chloroplatinic acid solution is heated, and potassium chloride solution is added under stirring, at this time Potassium chloroplatinate precipitation is generated, and potassium chloroplatinate is made into a paste with water, heated on a sand bath, and 40% sodium ni...

Claims

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