CN102021578B - Production method of deplating liquid for concentrated gold coating - Google Patents
Production method of deplating liquid for concentrated gold coating Download PDFInfo
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- CN102021578B CN102021578B CN 201010588725 CN201010588725A CN102021578B CN 102021578 B CN102021578 B CN 102021578B CN 201010588725 CN201010588725 CN 201010588725 CN 201010588725 A CN201010588725 A CN 201010588725A CN 102021578 B CN102021578 B CN 102021578B
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- gold
- gold coating
- decoating liquid
- compound
- deplating liquid
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Abstract
The invention relates to a production method of deplating liquid for concentrated gold coating, which is characterized by adding 100 to 150g of nitro compound, 0.05 to 0.12g of inorganic catalyst, 30 to 50g of KOH, 12 to 20g of D-potassium gluconate and 25 to 50g of potassium citrate into 1 liter of water to prepare the deplating liquid. The deplating liquid prepared according to the method of the invention is free from toxicity and harm, causes small environmental pollution, and can decoat the gold coating fast and efficiently.
Description
Technical field
The invention belongs to chemical field, relate in particular to a kind of working method of gold coating decoating liquid.
Background technology
Up to now; In process for treating surface; Plating is still the irreplaceable traditional technology of many modern techniquies, and particularly some has the gold plating of particular requirement to have a wide range of applications at aspects such as precision instrumentation, printed circuit board, unicircuit, shell, electric contacts.Gold-plated by its process characteristic, cyanogen-less gold is arranged and gold-plated two kinds of cyanogen is arranged.At present, gold-plated quality is to have cyanogen gold-plated for well, and its color and luster, tack, fastness to rubbing all are superior to cyanogen-less gold.In general, the gold-plated coating of homogeneity need not plate too thickly, if it reach 2 microns just passable.Heterogeneous gold-plated coating then should be thicker.The national regulation that has, the gold-plated coating of this series products must reach more than 10 microns.
In the process of electroplating gold; Coating underproof situation, particularly printed circuit board often occur, cause many gold-plated waste products; Recovery to gold in these waste products; The method of traditional gold coating strip is to adopt aqua regia dissolution, but has caused unprecedented, expendable environmental pollution thus, and the person to the operator causes serious injury simultaneously.
Summary of the invention
The working method that the purpose of this invention is to provide a kind of concentrated gold coating decoating liquid, the decoating liquid that uses this kind method to produce is nontoxic, and environmental pollution is little, and can rapidly and efficiently strip gold coating.
The objective of the invention is to realize through following technical scheme:
A kind of working method of concentrated gold coating decoating liquid is characterized in that: add nitro-compound 100～150g in every premium on currency, and organic catalyst 0.05～0.12g, KOH30～50g, maltonic acid potassium 12～20g, Tripotassium Citrate 25～50g makes decoating liquid.
Above-mentioned said nitro-compound is selected p-Nitrobenzenecarboxylic acid salt for use.
Above-mentioned said organic catalyst is selected ferric iron compound for use.
Above-mentioned ferric iron compound is iron nitrate or ferric sulfate or iron(ic)chloride.
The present invention compared with prior art has the following advantages:
1, adopt the decoating liquid of present method preparation itself nontoxic, environmental pollution is little.
2, the decoating liquid product property of present method preparation is stable, and transportation, storage are conveniently.
3, advantages of simple and practicable preparation method of the present invention, cost is low.
4, the working fluid of the present invention's preparation only needs can Gold plated Layer be stripped fully apace at normal temperatures; Has the good golden effect of moving back; Stripping thickness is that the gold coating of 1 μ m needed for 30 times in second approximately; The gold amount of moving back that should concentrate gold coating decoating liquid is about 300 grams per liters, uses the working fluid of the present invention's preparation for electroplating gold production convenience to be provided.
Embodiment
Embodiment below in conjunction with concrete is described in further detail the present invention.
Concentrate the working method of gold coating decoating liquid, add nitro-compound 100～150g in every premium on currency, organic catalyst 0.05～0.12g, KOH30～50g, maltonic acid potassium 12～20g, Tripotassium Citrate 25--50g makes decoating liquid.
Nitro-compound is selected p-Nitrobenzenecarboxylic acid salt for use.Organic catalyst is selected ferric iron compound for use, like iron nitrate or ferric sulfate or iron(ic)chloride.
It is following to use the method that above-mentioned concentrated gold coating decoating liquid preparation moves back golden working fluid: to move back golden working fluid be example to prepare 10 liters: place 7 premium on currency to dissolve 350～400 gram KCN (or NaCN); Add 1 liter of concentrated gold coating decoating liquid then, continue to be diluted with water to 10 liters, promptly form and move back golden working fluid.Moving back golden working fluid need be at present with join at present.
During use, at room temperature move back in the golden working fluid, strip fully, demonstrate till the element primary colour until Gold plated Layer with desiring to move back the immersion of gold dollar spare.
After using, be tending towards saturated, move back to add to concentrate when golden speed descends and move back golden liquid and KCN (or NaCN) when moving back golden working fluid.
Concentrated gold coating decoating liquid of the present invention is a weak yellow liquid, is alkalescence, and product property is stable.Concentrated gold coating decoating liquid of the present invention is highly suitable for the stripping that electronic circuit board, electronic component and other top layer contain gold plate; Only need can Gold plated Layer be stripped fully apace at normal temperatures; Have the good golden effect of moving back, stripping thickness is that the gold coating of 1 μ m needed for 30 times in second approximately, and the gold amount of moving back of this concentrated gold coating decoating liquid is about 300 grams per liters; Nickel or nickel plating matrix are not had corrosion phenomenon, the copper matrix is had slight corrosion.After moving back the completion of metal working do, can extract the gold of backing off according to ordinary method.The extraction process of moving back gold in the golden working fluid is simple, and the waste liquid gold content after the extraction is less than 3ppm, and it is very complete to prove that gold extracts.
Claims (2)
1. the working method of a concentrated gold coating decoating liquid; It is characterized in that adding in every premium on currency nitro-compound 100～150g, organic catalyst 0.05～0.12g, KOH30～50g; Maltonic acid potassium 12～20g; Tripotassium Citrate 25～50g makes decoating liquid, and said nitro-compound is selected p-Nitrobenzenecarboxylic acid salt for use, and said organic catalyst is selected ferric iron compound for use.
2. the working method of a kind of concentrated gold coating decoating liquid according to claim 1 is characterized in that: said ferric iron compound is iron nitrate or ferric sulfate or iron(ic)chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010588725 CN102021578B (en) | 2010-12-08 | 2010-12-08 | Production method of deplating liquid for concentrated gold coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010588725 CN102021578B (en) | 2010-12-08 | 2010-12-08 | Production method of deplating liquid for concentrated gold coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102021578A CN102021578A (en) | 2011-04-20 |
| CN102021578B true CN102021578B (en) | 2012-12-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010588725 Expired - Fee Related CN102021578B (en) | 2010-12-08 | 2010-12-08 | Production method of deplating liquid for concentrated gold coating |
Country Status (1)
| Country | Link |
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| CN (1) | CN102021578B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397351B (en) * | 2013-07-24 | 2016-04-06 | 励福(江门)环保科技股份有限公司 | The degold water of automatic degold production equipment, method and use |
| CN105239147A (en) * | 2015-10-01 | 2016-01-13 | 常州市奥普泰科光电有限公司 | Preparation method of environment-friendly spraying electrolysis stripping solution |
| CN106283057A (en) * | 2016-09-28 | 2017-01-04 | 佛山科学技术学院 | A kind of concentration gold plate decoating liquid and using method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995459A (en) * | 2006-11-24 | 2007-07-11 | 江苏工业学院 | Solution for removing printing board surface adhesion palladium and removing method |
| CN101845630A (en) * | 2009-03-25 | 2010-09-29 | 关东化学株式会社 | The selection etching solution of gold and nickel |
-
2010
- 2010-12-08 CN CN 201010588725 patent/CN102021578B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995459A (en) * | 2006-11-24 | 2007-07-11 | 江苏工业学院 | Solution for removing printing board surface adhesion palladium and removing method |
| CN101845630A (en) * | 2009-03-25 | 2010-09-29 | 关东化学株式会社 | The selection etching solution of gold and nickel |
Non-Patent Citations (2)
| Title |
|---|
| 吴水清.铜基不合格镀层的退除方法.《电镀与涂饰》.1990,(第3期),22-26. * |
| 高巧明.金镀层的退除.《电镀与环保》.2000,第20卷(第2期),38-39. * |
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| Publication number | Publication date |
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| CN102021578A (en) | 2011-04-20 |
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