CN101008097A - Process for removing harmful matter hexavalent chromium of electroplating layer - Google Patents
Process for removing harmful matter hexavalent chromium of electroplating layer Download PDFInfo
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- CN101008097A CN101008097A CN 200610166470 CN200610166470A CN101008097A CN 101008097 A CN101008097 A CN 101008097A CN 200610166470 CN200610166470 CN 200610166470 CN 200610166470 A CN200610166470 A CN 200610166470A CN 101008097 A CN101008097 A CN 101008097A
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- hexavalent chromium
- european union
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- objectionable impurities
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Abstract
The invention relates to a process of removing harm hexavalent chromium from galvanized coating, belonging to electric plating technology field. It comprises: immersing plated product in reducing agent and heating, reducing hexavalent chromium into trivalent chromium through chemical reaction, the plated product can meet the European Union imperative standard ROHS, and the problem of product export to European Union. The invention is characterized by simple process, economical, practical, no pollution, low requirement for inducer, distinctive technological effect and economical and social benefit.
Description
Technical field
The present invention relates to the chromic technology of objectionable impurities in a kind of removal galvanization coating, belong to the electroplating technology field.
Background technology
European Union uses the situation of some objectionable impuritiess in electronic electric equipment at some manufacturers, issued a compulsory standard ROHS (" using some objectionable impurities instruction ") about restriction in electronic electric equipment in February, 2003, and will be formally effective on July 1st, 2006, the electric equipment products such as indicating meter that enters European Union is strictly checked on.From July 1, be called as the severeest since the dawn of human civilization electronic product environmental regulation of European Union and come into effect, this is known as the instruction standard of ROHS in European Union, will make the electronic product outlet of 56,000,000,000 yuan in China be affected.
The ROHS of European Union command request, on July 1st, 2006 threw in the Electrical and Electronic product in European Union market later on, must not contain 6 kinds of objectionable impuritiess such as lead, mercury, cadmium.This instruction relates to large-scale home appliances, miscellaneous small appliances, IT and telecommunication device, audio-visual equipment, set lights, electric and 8 class electronic products such as electrician's instrument, toy and outdoor activity equipment, vending machine.
At present in the existing plating technology, because the chromic acid solution that adopts chromic trioxide dissolving back to form, add some additives again, thereby can make and contain sexavalent chrome in the plated item, contain the objectionable impurities sexavalent chrome of forbidding among the compulsory standard ROHS of European Union in the domestic electroplating industry in the ubiquity coating, still do not have appropriate treatment process.
Summary of the invention
The purpose of this invention is to provide the chromic technology of objectionable impurities in a kind of removal galvanization coating, by the objectionable impurities sexavalent chrome in this technology elimination plated item coating, make plating back product can meet the compulsory standard ROHS of European Union, solve a big technical barrier of products export European Union.
The objective of the invention is to be achieved through the following technical solutions, the chromic technology of objectionable impurities in a kind of removal galvanization coating, it is characterized in that described technology is that the product after the plating is immersed in the reductant solution that concentration is 7-15%, heat to 50-70 ℃, kept this temperature 20-40 minute, and took out post-flush, dry naturally.
Described reductive agent is a pyrosulphite iron, or iron protoxide, or Sulfothiorine.
The present invention soaks in reductive agent by the product after will plating and heats, objectionable impurities hexavalent chrome reduction in the coating can be become harmless trivalent chromium through chemical reaction, thereby eliminated objectionable impurities, make plating back product can meet the compulsory standard ROHS of European Union, solved a big technical barrier of products export European Union, art treatment of the present invention is simple, economic, practical, pollution-free in the treating processes, less demanding to reductive agent, its technique effect is extremely remarkable, has remarkable economic efficiency and social benefit.
Embodiment
Further specify the present invention in conjunction with the embodiments, technology of the present invention is that the product that will contain the sexavalent chrome objectionable impurities after electroplating is immersed in the reductant solution that concentration is 7-15%, heat to 50-70 ℃, kept this temperature 20-40 minute, take out after flushing, again dry naturally the product of unharmful substance; Reductive agent can be a pyrosulphite iron, or iron protoxide, or Sulfothiorine.
Reaction formula is as follows: Cr6++3e → Cr3+.
Claims (2)
1, the chromic technology of objectionable impurities in a kind of removal galvanization coating, it is characterized in that described technology is that plating back product is immersed in the reductant solution that concentration is 7-15%, heat to 50-70 ℃, kept this temperature 20-40 minute, take out post-flush, dry naturally.
2, the chromic technology of objectionable impurities in the removal galvanization coating according to claim 1 is characterized in that described reductive agent is a pyrosulphite iron, or iron protoxide, or Sulfothiorine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610166470 CN101008097A (en) | 2006-12-19 | 2006-12-19 | Process for removing harmful matter hexavalent chromium of electroplating layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610166470 CN101008097A (en) | 2006-12-19 | 2006-12-19 | Process for removing harmful matter hexavalent chromium of electroplating layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101008097A true CN101008097A (en) | 2007-08-01 |
Family
ID=38696752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610166470 Pending CN101008097A (en) | 2006-12-19 | 2006-12-19 | Process for removing harmful matter hexavalent chromium of electroplating layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101008097A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609529A (en) * | 2014-05-26 | 2015-05-13 | 尹景启 | Complexing reducing agent for hexavalent chromium |
| CN112607760A (en) * | 2020-12-25 | 2021-04-06 | 北京建筑材料科学研究总院有限公司 | Cement kiln bypass air-bleeding ash resource utilization system and method |
-
2006
- 2006-12-19 CN CN 200610166470 patent/CN101008097A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609529A (en) * | 2014-05-26 | 2015-05-13 | 尹景启 | Complexing reducing agent for hexavalent chromium |
| CN112607760A (en) * | 2020-12-25 | 2021-04-06 | 北京建筑材料科学研究总院有限公司 | Cement kiln bypass air-bleeding ash resource utilization system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |