CN107475731A - A kind of method for removing proof gold product surface erythema - Google Patents
A kind of method for removing proof gold product surface erythema Download PDFInfo
- Publication number
- CN107475731A CN107475731A CN201710617766.8A CN201710617766A CN107475731A CN 107475731 A CN107475731 A CN 107475731A CN 201710617766 A CN201710617766 A CN 201710617766A CN 107475731 A CN107475731 A CN 107475731A
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- China
- Prior art keywords
- proof gold
- erythema
- product surface
- gold
- gold product
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The present invention provides a kind of method for removing proof gold product surface erythema, particular for the recovery of proof gold handicraft surface color change portion, the mainly recovery of red stain, cleaning fluid is prepared first, then the proof gold product of discoloration is put into cleaning fluid to erythema and disappeared, then take out, cleaned, dried with deionized water, it is an advantage of the invention that：It has that technical process is simple, removes surface erythema and takes short, proof gold surface is without physical damnification；Medium acid is nitric acid, and proof gold will not lose, and the cleaning fluid is reusable, is easily cleaned after removing erythema.
Description
Technical field
The invention belongs to Treatment of Metal Surface, and in particular to a kind of method for removing proof gold product surface erythema.
Background technology
The chemical property of gold is extremely stable, is not reacted under the conditions of non-extreme with any oxide.But in recent years,
The report of proof gold product especially jewelry surface " getting rusty " is seen in various media often, and this is due to gold and silver processing technology of today
Caused by itself.In gold and silver process, due to high-speed cruising such as car, plane, milling etc. of various machine tools, cause to add
There is gold, silver molecule in the dust of work scene（Naked eyes are not seen at all）, enterprise's process equipment gold and silver for also having not separated time,
Also result in " the viscous silver of gold " phenomenon.As long as proof gold product surface is stained with Argent grain, under the conditions of humiture is suitable, between gold and silver
Galvanic cell small one by one will be formed so as to form couple corrosion, silver atoms, which lose, electronically forms silver ion, and in air
Sulfide formed black silver sulfide, and black vulcanization silver layer it is very thin, under the setting off of golden true qualities, with silver sulfide thin layer
Thickness change and show red → blueness → black patch, here it is the basic reason of so-called gold " getting rusty ".Gold itself is not
It is corroded, what is be corroded is the small Argent grain for being adhered to gold surface.Cause to change colour if of bad quality, that discoloration is just
It is uniformly to change colour, local discolouration can never occurs.
In addition, in skin care item and cosmetics that now people use, some wherein contain Trace Mercury, then people are wearing
When proof gold ornaments, these pollutants are inevitably stain to the surface of upper gold, and mercury can form " amalgam " so as to make with gold
Spot corrosion occurs into proof gold product surface and forms spot.
Now, occur the processing method that erythema there is no shaping to proof gold surface, mostly take following methods reparation：Wipe
Method, i.e., proof gold surface is wiped with toothpaste or similar grinding agent, although can remove, surface can leave tiny cut, influence
Outward appearance, and to the processing of complex-shaped and irregular ornaments, this method is with regard to helpless；Calcination method, that is, use high temp fire
Rifle calcination spot, although can also remove, but still it can leave a trace, the proof gold product high to appearance requirement to some（Such as gold coin
Minute surface）Then be not suitable for.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of side for removing proof gold product surface erythema
Method, it is characterised in that：Thiocarbamide is dissolved in deionized water, is added acid and surfactant, is stirred, the solution is heated to
35 ~ 50 DEG C, then the proof gold product that surface into erythema occurs is put into immersion, takes out and is cleaned and dried.Specifically include following steps：
Step 1）80 ~ 150 grams of complexing agent is weighed, configuration is dissolved in ‰ ~ 10vt of total amount 1vt ‰ deionized water, adds 2vt ‰
~ 15vt ‰ nitric acid, ‰ ~ 5vt of 1vt ‰ surfactant, stirs, and forms etching solution, standby；
Step 2）Take step 1）Gained etching solution, the etching solution is heated to 35 ~ 50 DEG C, then surface to the proof gold system of erythema occurs
Product are put into 30 ~ 300s of immersion in 35 ~ 50 DEG C of solution configured, and taking-up is cleaned with deionized water, dried.
It is an advantage of the invention that：It has that technical process is simple, removes proof gold product surface erythema and takes short, proof gold surface
Without physical damnification；Medium acid is nitric acid, and proof gold will not lose；The cleaning fluid is reusable, is easily cleaned after taking out erythema.
Embodiment
The technical solution adopted by the present invention is：A kind of method for removing proof gold product surface erythema, step are as follows：Weigh network
80 ~ 150 grams of mixture is dissolved in 1000mL deionized waters, is added 2 ~ 15mL acid, 1 ~ 5mL surfactants, is stirred, by this
Solution is heated to 35 ~ 50 DEG C, then the proof gold product that surface into erythema occurs is put into 30 ~ 300s of immersion, takes out and is cleaned and dried.
The complexing agent is analysis bright sulfur urea.Thiocarbamide is white crystal, is dissolved in water.In acid condition can be with silver, copper etc.
A variety of cations form soluble complex ion.
The acid is the pure nitric acid of analysis.Analyze pure nitric acid（Mass fraction is：65%~68%）Molar concentration be：
14.4mol/L~15.2 mol/L。
The surfactant is lauryl amine APEO, the combination of NPE or wherein any one
Kind.Lauryl amine polyoxyethylene molecular formula is C16H35NO2, is a kind of nonionic surfactant, rises and activates, soaks, sprawling work
It is that C15H24O. (C2H4O) n, n is the degree of polymerization with, NPE molecular formula, and a kind of non-ionic surface active
Agent, mainly play solubilization.
Reaction mechanism is as follows：
Because it is mainly that silver sulfide covers thereon that gold surface, which goes out erythema, therefore, removes erythema and namely dissolve silver sulfide without hindering
The golden background of evil.Although Ag2S solubility product very little, still suffers from the dissolving of denier in aqueous（Because insoluble is all phase
To, and it is absolute to dissolve）：
Ag2S⇌ 2Ag++S2-
Being represented in formula, this is a reversible reaction, and if suitable complexing agent and Ag+ are complexed, product concentration reduces, that
Chemical reaction equilibrium will be carried out to the right, will be taken off so as to the color change portion of black.
The chemical constitution of thiocarbamide molecule is identified as following resonant：
I.e. it be by free electron pair possessed by the N+ and S atom in molecule, with silver ion formed complex ions [Ag (
H2NCSNH2) 3]+enter solution, be abbreviated as [Ag (TU) 3]+, complexing stability constant 13.1, therefore it is right
Ag2S, AgCl and metal Ag etc. have very strong dissolving complexing.
Therefore the net reaction of the reaction should be：
Ag2S+TU+H+ → [Ag ( TU) 3 ] ++H2S
And if caused by color change portion is mercury, Trace Mercury therein can also be dissolved and gone by nitric acid in cleaning fluid of the invention
Remove.
Hg +HNO3→ Hg（NO3）2
Embodiment 1
1st, 140 grams of analysis bright sulfur ureas are weighed to be placed in beaker, add 1000mL deionized waters, heating stirring makes thiocarbamide completely molten
Solution；
2nd, remove, be cooled to room temperature, insoluble matter is filtered out with qualitative filter paper；
3rd, add 10mL into thiourea solution again and analyze pure nitric acid, stir；
4th, 50 DEG C are heated the solution to, the proof gold ring of one piece of long erythema is immersed, jiggles 60s；
5th, ring is taken out, is cleaned up with deionized water, wipes surface with clean muslin, then it is blown with hair dryer with cool breeze
Surface 1min.
Embodiment 2
1st, 120 grams of analysis bright sulfur ureas are weighed to be placed in beaker, add 1000mL deionized waters, heating stirring makes thiocarbamide completely molten
Solution；
2nd, remove, be cooled to room temperature, insoluble matter is filtered out with qualitative filter paper；
3rd, add 8mL into thiourea solution again and analyze pure nitric acid, stir；
4th, 40 DEG C are heated the solution to, the proof gold ring of one piece of long erythema is immersed, jiggles 80s；
5th, ring is taken out, is cleaned up with deionized water, wipes surface with clean muslin, then it is blown with hair dryer with cool breeze
Surface 2min.
Embodiment 3
1st, 100 grams of analysis bright sulfur ureas are weighed to be placed in beaker, add 1000mL deionized waters, heating stirring makes thiocarbamide completely molten
Solution；
2nd, remove, be cooled to room temperature, insoluble matter is filtered out with qualitative filter paper；
3rd, add 12mL into thiourea solution again and analyze pure nitric acid, stir；
4th, 40 DEG C are heated the solution to, a solid-gold chain for having erythema is immersed, jiggles 210s；
5th, solid-gold chain is taken out, is cleaned up with deionized water, surface is wiped with clean muslin, then with hair dryer cool breeze
Blow its surface 5min.
Claims (4)
- A kind of 1. method for removing proof gold product surface erythema, it is characterised in that：Step is as follows：Step 1）80 ~ 150 grams of complexing agent is weighed, configuration is dissolved in ‰ ~ 10vt of total amount 1vt ‰ deionized water, adds 2vt ‰ ~ 15vt ‰ nitric acid, ‰ ~ 5vt of 1vt ‰ surfactant, stirs, and forms etching solution, standby；Step 2）Take step 1）Gained etching solution, the etching solution is heated to 35 ~ 50 DEG C, then surface to the proof gold system of erythema occurs Product are put into 30 ~ 300s of immersion in 35 ~ 50 DEG C of solution configured, and taking-up is cleaned with deionized water, dried.
- 2. the method for the removal proof gold product surface erythema according to right 1, it is characterised in that：The complexing agent is pure to analyze Thiocarbamide.
- 3. the method for the removal proof gold product surface erythema according to right 1, it is characterised in that：The acid for concentration is The 65wt%-68wt% pure nitric acid of analysis.
- 4. the method for the removal proof gold product surface erythema according to right 1, it is characterised in that：The surfactant is ten Diamines APEO, the combination of NPE or any of which.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617766.8A CN107475731A (en) | 2017-07-26 | 2017-07-26 | A kind of method for removing proof gold product surface erythema |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710617766.8A CN107475731A (en) | 2017-07-26 | 2017-07-26 | A kind of method for removing proof gold product surface erythema |
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| Publication Number | Publication Date |
|---|---|
| CN107475731A true CN107475731A (en) | 2017-12-15 |
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ID=60597947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710617766.8A Pending CN107475731A (en) | 2017-07-26 | 2017-07-26 | A kind of method for removing proof gold product surface erythema |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108482312A (en) * | 2018-03-09 | 2018-09-04 | 福耀集团长春有限公司 | A kind of restoring method for glass heating wire |
| CN110129809A (en) * | 2019-04-09 | 2019-08-16 | 上海老凤祥首饰研究所有限公司 | A kind of double set necklace surface lossless process techniques of thousand pure golds |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2628199A (en) * | 1949-12-21 | 1953-02-10 | Frederick A Lowenheim | Tarnish remover |
| US4561895A (en) * | 1982-03-12 | 1985-12-31 | Eriksson Jan Olof | Non-abrasive metal cleaning agent |
| CN1198783A (en) * | 1996-06-08 | 1998-11-11 | 雷克特和科尔曼产品有限公司 | Composition for cleaning silver or copper |
| CN102660747A (en) * | 2012-04-13 | 2012-09-12 | 中国文化遗产研究院 | Thiourea compound rust remover and rust removal paste for protecting silverware and gilded silverware |
| CN103923571A (en) * | 2014-04-25 | 2014-07-16 | 苏州新材料研究所有限公司 | Polishing solution as well as preparation method and application of polishing solution |
| CN106119747B (en) * | 2016-06-23 | 2018-05-04 | 新昌县金声铜业有限公司 | A kind of imitative 24K gold heat treatment method of albronze |
-
2017
- 2017-07-26 CN CN201710617766.8A patent/CN107475731A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2628199A (en) * | 1949-12-21 | 1953-02-10 | Frederick A Lowenheim | Tarnish remover |
| US4561895A (en) * | 1982-03-12 | 1985-12-31 | Eriksson Jan Olof | Non-abrasive metal cleaning agent |
| CN1198783A (en) * | 1996-06-08 | 1998-11-11 | 雷克特和科尔曼产品有限公司 | Composition for cleaning silver or copper |
| CN102660747A (en) * | 2012-04-13 | 2012-09-12 | 中国文化遗产研究院 | Thiourea compound rust remover and rust removal paste for protecting silverware and gilded silverware |
| CN103923571A (en) * | 2014-04-25 | 2014-07-16 | 苏州新材料研究所有限公司 | Polishing solution as well as preparation method and application of polishing solution |
| CN106119747B (en) * | 2016-06-23 | 2018-05-04 | 新昌县金声铜业有限公司 | A kind of imitative 24K gold heat treatment method of albronze |
Non-Patent Citations (3)
| Title |
|---|
| 廖文胜等编著: "《宾馆与家用洗涤剂配方设计》", 31 January 2000 * |
| 胡兆平主编: "《新编少女生活小百科 3》", 31 August 2009 * |
| 郑寿山: "《金融实用咨询大全 怎样与银行打交道1000问》", 31 October 1993 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108482312A (en) * | 2018-03-09 | 2018-09-04 | 福耀集团长春有限公司 | A kind of restoring method for glass heating wire |
| CN110129809A (en) * | 2019-04-09 | 2019-08-16 | 上海老凤祥首饰研究所有限公司 | A kind of double set necklace surface lossless process techniques of thousand pure golds |
| CN110129809B (en) * | 2019-04-09 | 2021-04-23 | 上海老凤祥首饰研究所有限公司 | Surface nondestructive treatment process for thousand pure gold double-set necklace |
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