CN107604395A - A kind of silver-plated mode of non-cyanide alkali - Google Patents
A kind of silver-plated mode of non-cyanide alkali Download PDFInfo
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- CN107604395A CN107604395A CN201711020373.5A CN201711020373A CN107604395A CN 107604395 A CN107604395 A CN 107604395A CN 201711020373 A CN201711020373 A CN 201711020373A CN 107604395 A CN107604395 A CN 107604395A
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Abstract
A kind of environmental non-cyanide alkalescence plate silver plating solution dispersibility provided by the invention is up to 84.12%, far above 59.4%~72.7% dispersibility of domestic pharmaceutical industry industry, close to 86.04% dispersibility of advanced foreign technology, plating solution performance is improved largely compared with domestic corporation, significantly improve coating surface glossiness and stability, though more external also still have certain gap, but break external high-tech technical monopoly for lifting the domestic silver-plated technology of non-cyanide alkali, undoubtedly there is great pioneering and enthusiasm, there are wide market prospects；The silvering of full sheet bright in mirror surface can be obtained, current density range is wide, can obtain that surfacing, anti-discoloration are good, anticorrosive wear-resistant is high, and binding force of cladding material is good, and dispersibility and covering power are good, and electroplating wastewater processing is easier, safeguard it is simple, it is economical and practical.
Description
Technical field
The present invention relates to a kind of silver plating process, the silver-plated mode of more particularly to a kind of non-cyanide alkali.
Background technology
In past a very long time, because cyanide bath stability is good, covering power is strong, and coating is careful, resistance to
Reason, the cyanide silver plating process such as corrosion is good are widely adopted.But due in cyanide silver plating process liberation of hydrogen it is serious, cause
Silver coating has very high fragility, and along with cyanide silver plating solution has very high toxicity, wastewater treatment is difficult, to air and
Underground water pollution is serious, and alkalescence is silver-plated now and faintly acid silver plating process is gradually developed and substitutes cyaniding for industry plating
Thing is silver-plated.Corresponding cyanide silver plating process, alkaline silver plating process substantially reduce to the destructive power of environment, but the electric current effect of plating solution
Rate is not high (about 70%), the precipitation of a large amount of hydrogen and it is caused ooze the problem of hydrogen makes metallic matrix that " hydrogen embrittlement " occur than more serious, add
Weighed the burden of dehydrogenation after electrosilvering, in alkaline silver plating liquid the use of a large amount of organic additives increase the fragility of coating, and
Coating is thicker, and brittleness problems are more serious.
Again after the silver-plated middle addition brightener (monomer, intermediate and their mixing compound) of non-cyanide alkali, macroscopically
See that the brightness of coating surface, finish have largely to improve, can also substantially meet in general needs；But from micro-
Seen in sight, it is relatively rough, loose to plate the crystal grain of layer texture, and some also has distant air-flow scar or tumour shape, Er Qiegao,
The difference of the deposit thickness in low current area is also bigger, or even the phenomenon of coarse, the low area's plating leakage in You Gao areas.These defects no doubt with
The dispersive property of brightener is that people often says in the industry " walking property " is relevant, but is found after furtheing investigate, it is main or with light
Agent can not fully dissolve, be scattered relevant in the plating solution；Also, thus also cause brightener consumption excessive.
Alkalescence it is silver-plated in, can as key light agent material it is a lot.Except inorganic metal salt, organic salt and the chemical combination of routine
Outside thing, the current intermediate as key light agent has benzyl nicotinate drone salt, imidazoles propoxyl group condensation product, the season of six methine of chlorination three
The condensation product of amine salt, dimethylamine propylamine and ethylenediamine and epoxychloropropane, water-soluble cationic quaternary amine；It is also quaternary ammoniated poly-
Vinyl imidazol, the polyethyleneimine of low molecule amount, methoxybenzaldehyde etc..These intermediates each or combine have it is certain
Enhanced shine, for coating and imperfection, key light agent is only added in basal liquid, although the brightness of coating can be significantly
Degree ground is presented, but because it fails fully to dissolve in body plating solution and equably absorption, wetting in metal/solution interface, are led
Inevitably there is air-flow, scar shape in metal surface particularly high current area in cause, even has mist color, plating leakage in low current area
Phenomenon.Crystal grain is larger, and thickness of coating is extremely uneven, and fragility is larger.
The content of the invention
For desired technical deficiency, the present invention provides a kind of silver-plated mode of non-cyanide alkali.
To achieve these goals, the technical solution used in the present invention is：A kind of silver-plated mode of non-cyanide alkali, technique
It is as follows：
10~12g/L of silver
130~145g/L of sodium hydroxide
25~30ml/L of regulator
5~8ml/L of open cylinder agent
1~3ml/L of brightener
0.1~0.3ml/L of wetting agent
20~30 DEG C of temperature
2.0~3.5A/dm2 of cathode-current density
1.0~2.0A/dm2 of anodic current density
Filtering is continuous
Stir air, movable cathode
Wherein, described brightener is by polyethyleneimine, imidazoles propoxyl group condensation product, nitrogen heterocycles derivative, modified virtue
Fragrant aldehyde compound, epoxychloropropane and water are made.
The technique supplements addition in the future：150~250ml/KAH of brightener, walk 50~70ml/KAH of agent, regulator
5L/25 kilograms of sodium hydroxide.
The brightener is prepared by following steps：By 10~20 parts of polyethyleneimines, 15~25 parts of imidazoles propoxyl group contractings
Compound, 25~35 parts of nitrogen heterocycles derivatives, 13~23 parts of modified aromatic aldehyde compounds and 400~500 parts of water add reaction
In device, 45 DEG C are warming up to；70~80 parts of epoxychloropropane are added in dropping funel, is slowly dropped into reactor and stirs anti-
Should, reaction temperature is no more than 45 DEG C, and time for adding is 3~5h；After step S2 is added dropwise to complete epoxychloropropane, by reactor
Temperature be increased to 80 DEG C, stirring reaction 6h, obtain brightener.
Described regulator is sodium gluconate；Described open cylinder agent is polyethylene polyamine and epoxychloropropane addition product；
Described wetting agent is lauryl sodium sulfate；The described agent that walks is modified polyvinylalcohol addition product.
Beneficial effects of the present invention：A kind of environmental non-cyanide alkalescence plate silver plating solution dispersibility provided by the invention reaches
84.12%, far above 59.4%~72.7% dispersibility of domestic pharmaceutical industry industry, close to the 86.04% of advanced foreign technology
Dispersibility, plating solution performance is improved largely compared with domestic corporation, significantly improves coating surface glossiness and stability, though compared with
Also still there are certain gap in foreign countries, but break external high-tech technical monopoly for lifting the domestic silver-plated technology of non-cyanide alkali, undoubtedly
It is that there is great pioneering and enthusiasm, there are wide market prospects；The silvering of full sheet bright in mirror surface can be obtained, electricity
Current density scope is wide, can obtain that surfacing, anti-discoloration are good, anticorrosive wear-resistant is high, and binding force of cladding material is good, dispersibility and
Covering power is good, and electroplating wastewater processing is easier, and safeguards simply, economical and practical.
Embodiment
A kind of silver-plated mode of non-cyanide alkali, technique are as follows：
10~12g/L of silver
130~145g/L of sodium hydroxide
25~30ml/L of regulator
5~8ml/L of open cylinder agent
1~3ml/L of brightener
0.1~0.3ml/L of wetting agent
20~30 DEG C of temperature
2.0~3.5A/dm2 of cathode-current density
1.0~2.0A/dm2 of anodic current density
Filtering is continuous
Stir air, movable cathode
Wherein, described brightener is by polyethyleneimine, imidazoles propoxyl group condensation product, nitrogen heterocycles derivative, modified virtue
Fragrant aldehyde compound, epoxychloropropane and water are made.
The technique supplements addition in the future：150~250ml/KAH of brightener, walk 50~70ml/KAH of agent, regulator
5L/25 kilograms of sodium hydroxide.
The brightener is prepared by following steps：By 10~20 parts of polyethyleneimines, 15~25 parts of imidazoles propoxyl group contractings
Compound, 25~35 parts of nitrogen heterocycles derivatives, 13~23 parts of modified aromatic aldehyde compounds and 400~500 parts of water add reaction
In device, 45 DEG C are warming up to；70~80 parts of epoxychloropropane are added in dropping funel, is slowly dropped into reactor and stirs anti-
Should, reaction temperature is no more than 45 DEG C, and time for adding is 3~5h；After step S2 is added dropwise to complete epoxychloropropane, by reactor
Temperature be increased to 80 DEG C, stirring reaction 6h, obtain brightener.
Described regulator is sodium gluconate；Described open cylinder agent is polyethylene polyamine and epoxychloropropane addition product；
Described wetting agent is lauryl sodium sulfate；The described agent that walks is modified polyvinylalcohol addition product.
Beneficial effects of the present invention：A kind of environmental non-cyanide alkalescence plate silver plating solution dispersibility provided by the invention reaches
84.12%, far above 59.4%~72.7% dispersibility of domestic pharmaceutical industry industry, close to the 86.04% of advanced foreign technology
Dispersibility, plating solution performance is improved largely compared with domestic corporation, significantly improves coating surface glossiness and stability, though compared with
Also still there are certain gap in foreign countries, but break external high-tech technical monopoly for lifting the domestic silver-plated technology of non-cyanide alkali, undoubtedly
It is that there is great pioneering and enthusiasm, there are wide market prospects；The silvering of full sheet bright in mirror surface can be obtained, electricity
Current density scope is wide, can obtain that surfacing, anti-discoloration are good, anticorrosive wear-resistant is high, and binding force of cladding material is good, dispersibility and
Covering power is good, and electroplating wastewater processing is easier, and safeguards simply, economical and practical.
Claims (4)
1. the silver-plated mode of a kind of non-cyanide alkali, it is characterised in that technique is as follows：
10~12g/L of silver
130~145g/L of sodium hydroxide
25~30ml/L of regulator
5~8ml/L of open cylinder agent
1~3ml/L of brightener
0.1~0.3ml/L of wetting agent
20~30 DEG C of temperature
2.0~3.5A/dm2 of cathode-current density
1.0~2.0A/dm2 of anodic current density
Filtering is continuous
Stir air, movable cathode
Wherein, described brightener is by polyethyleneimine, imidazoles propoxyl group condensation product, nitrogen heterocycles derivative, modified aromatic aldehyde
Class compound, epoxychloropropane and water are made.
2. the silver-plated mode of a kind of non-cyanide alkali according to claim 1, it is characterised in that the technique is supplemented in the future to be added
Add：5L/25 kilograms of 150~250ml/KAH of brightener, the 50~70ml/KAH of agent that walks, regulator sodium hydroxide.
3. the silver-plated mode of a kind of non-cyanide alkali according to claim 2, it is characterised in that the brightener passes through following
It is prepared by step：10~20 parts of polyethyleneimines, 15~25 parts of imidazoles propoxyl group condensation products, 25~35 parts of nitrogen heterocycles are derived
Thing, 13~23 parts of modified aromatic aldehyde compounds and 400~500 parts of water are added in reactor, are warming up to 45 DEG C；By 70~80 parts
Epoxychloropropane is added in dropping funel, is slowly dropped into reactor and stirring reaction, and reaction temperature is no more than 45 DEG C, during dropwise addition
Between be 3~5h；After step S2 is added dropwise to complete epoxychloropropane, the temperature of reactor is increased to 80 DEG C, stirring reaction 6h,
Obtain brightener.
4. the silver-plated mode of a kind of non-cyanide alkali according to claim 2, it is characterised in that described regulator is grape
Sodium saccharate；Described open cylinder agent is polyethylene polyamine and epoxychloropropane addition product；Described wetting agent is dodecyl sulphate
Sodium；The described agent that walks is modified polyvinylalcohol addition product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711020373.5A CN107604395A (en) | 2017-10-26 | 2017-10-26 | A kind of silver-plated mode of non-cyanide alkali |
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| CN201711020373.5A CN107604395A (en) | 2017-10-26 | 2017-10-26 | A kind of silver-plated mode of non-cyanide alkali |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576742A (en) * | 2019-01-26 | 2019-04-05 | 宁波市鄞州艾博化工科技有限公司 | Novel alkaline non-cyanogen galvanization additive |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951139A (en) * | 2016-07-15 | 2016-09-21 | 佛山市仁昌科技有限公司 | Non-cyanogen alkali silver plating process |
-
2017
- 2017-10-26 CN CN201711020373.5A patent/CN107604395A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105951139A (en) * | 2016-07-15 | 2016-09-21 | 佛山市仁昌科技有限公司 | Non-cyanogen alkali silver plating process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576742A (en) * | 2019-01-26 | 2019-04-05 | 宁波市鄞州艾博化工科技有限公司 | Novel alkaline non-cyanogen galvanization additive |
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Application publication date: 20180119 |