CN105951139A - Non-cyanogen alkali silver plating process - Google Patents
Non-cyanogen alkali silver plating process Download PDFInfo
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- CN105951139A CN105951139A CN201610567389.7A CN201610567389A CN105951139A CN 105951139 A CN105951139 A CN 105951139A CN 201610567389 A CN201610567389 A CN 201610567389A CN 105951139 A CN105951139 A CN 105951139A
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- Prior art keywords
- brightener
- silver plating
- plating process
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- silver
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/46—Electroplating: Baths therefor from solutions of silver
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/04—Electroplating with moving electrodes
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The invention provides a non-cyanogen alkali silver plating process. According to the process, 10-12 g/L of silver, 130-145 g/L of sodium hydroxide, 25-30 ml/L of a modifier, 6-8 ml/L of a plating cylinder, 1-3 ml/L of a brightener and 0.1-0.3 ml/L of a wetting agent are included, the temperature ranges from 25 DEG C to 30 DEG C, the cathode current density ranges from 2.0 A/dm<2> to 3.5 A/dm<2>, the anode current density ranges from 1.0 A/dm<2> to 2.0 A/dm<2>, and continuous filtering, air stirring and cathode moving are conducted, wherein the brightener is prepared from polyethyleneimine, an imidazole propoxy condensation product, a nitrogen heterocycle group derivative, a modified aromatic aldehyde group compound, epoxy chloropropane and water; the silver plating layer of which the whole piece of mirror plane is bright can be obtained; the current density range is wide; the effects that the surface is level, glossy fading resistance is good, corrosion resistance and wear resistance are high, the binding force of the plating layer is good, and dispersive capacity and covering capacity are good can be achieved; and electroplating wastewater treatment is easier, maintenance is easy, and the non-cyanogen alkali silver plating process is economical and practical.
Description
Technical field
The present invention relates to a kind of silver plating process, particularly to the silver plating process of a kind of non-cyanide alkali.
Background technology
In a very long time in past, because cyanide bath good stability, covering power
The reasons such as by force, coating is careful, and corrosion resistance is good, cyanide silver plating process is widely adopted.But,
Owing to liberation of hydrogen is serious in cyanide silver plating process, causes silver coating to have the highest fragility, then add
Upper cyanide silver plating solution has the highest toxicity, and waste water difficult treatment, to air and subsoil water
Seriously polluted, alkalescence is silver-plated and faintly acid silver plating process is gradually developed and is used for industrial electro now
It is silver-plated that plating carrys out substitute.Corresponding cyanide silver plating process, alkalescence silver plating process is to environment
Destructive power be substantially reduced, but the current efficiency of plating solution the highest (about 70%), the analysis of a large amount of hydrogen
Go out and produce ooze hydrogen make metallic matrix occur " hydrogen embrittlement " problem ratio more serious, increased the weight of electricity
The burden of silver-plated rear dehydrogenation, in alkalescence silver plating liquid, the employing of a large amount of organic additives makes the crisp of coating
Property increase, and coating is the thickest, and brittleness problems is the most serious.
At the silver-plated middle addition brightener of non-cyanide alkali, (monomer, intermediate and their mixing are multiple
Join thing) after, macroscopically see that the brightness of coating surface, fineness have and improve largely,
Substantially can also meet general needs；But from microcosmic, the crystal grain of coating texture compares
Coarse, loose, that have also distant air-flow cicatrix or tumor shape, and high and low electricity
The difference of the deposit thickness in stream district is the biggest, the phenomenon of even You Gao district district coarse, low plating leakage.
These defects are no doubt relevant with " the walking property " that the dispersive property of brightener people the most in the industry often says,
But find after further investigation, mainly or can not dissolve fully in the plating solution with brightener,
Disperse relevant；Further, the most also cause brightener consumption excessive.
In alkalescence is silver-plated, can be a lot of as the material of key light agent.Except conventional inorganic metal
Outside salt, organic salt and compound, now the intermediate as key light agent have benzyl nicotinate drone salt,
Imidazoles propoxyl group condensation substance, chlorination six methine three quaternary amine, DIMAPA and ethylenediamine
Condensation substance, water-soluble cationic quaternary amine with epoxychloropropane；Also has quaternary ammoniated polyethylene miaow
Azoles, the polymine of low-molecular-weight, methoxybenzaldehyde etc..These intermediate are each or group
The most all there is certain enhanced shine, but for coating and imperfection, in basal liquid only
Add key light agent, although the brightness of coating can present significantly, but owing to it fails fully
Ground dissolves in body plating solution and absorption, moistening are at metal/solution interface equably, and causing can not
Avoid in metal surface, there is air-flow, cicatrix shape, in low current district very in the highest Current Zone
To having mist color, plating leakage phenomenon.Crystal grain is relatively big, and thickness of coating is the most uneven, and fragility is relatively
Greatly.
Summary of the invention
For the technical deficiency wanted, the present invention provides the silver plating process of a kind of non-cyanide alkali.
To achieve these goals, the technical solution used in the present invention is: a kind of non-cyanide alkali
Silver plating process, technique is as follows:
Silver 10～12g/L
Sodium hydroxide 130～145g/L
Regulator 25～30ml/L
Open cylinder agent 6～8ml/L
Brightener 1～3ml/L
Wetting agent 0.1～0.3ml/L
Temperature 25～30 DEG C
Cathode-current density 2.0～3.5A/dm2
Anodic current density 1.0～2.0A/dm2
Filter continuously
Stirring air, movable cathode
Wherein, described brightener is spread out by polymine, imidazoles propoxyl group condensation substance, nitrogen heterocycles
Biology, modified aromatic aldehyde compound, epoxychloropropane and water prepare.
Described technique is supplemented in the future and is added: brightener 150～250ml/KAH, walk agent
50～70ml/KAH, regulator 5L/25 kilogram sodium hydroxide.
Described brightener is prepared by following steps: by 10～20 parts of polymine, 15～25
Part imidazoles propoxyl group condensation substance, 25～35 parts of nitrogen heterocycles derivants, 13～23 parts of modified aromatics
Aldehyde compound and 400～500 parts of water add in reactor, are warming up to 45 DEG C；By 70～80
Part epoxychloropropane adds in Dropping funnel, is slowly dropped in reactor and stirs reaction, reaction
Temperature is less than 45 DEG C, and time for adding is 3～5h；It is added dropwise to complete epoxy chloropropionate through step S2
After alkane, the temperature of reactor is increased to 80 DEG C, stirring reaction 6h, obtain brightener.
Described regulator is sodium gluconate；Described open cylinder agent is polyethylene polyamine and epoxy
Chloropropane addition product；Described wetting agent is sodium lauryl sulphate；The described agent that walks is for changing
Property polyvinyl alcohol addition product.
Beneficial effects of the present invention: a kind of environmental non-cyanide silver-plated plating of alkalescence that the present invention provides
Liquid dispersibility reaches 84.12%, the dispersion energy far above 59.4%～the 72.7% of domestic pharmaceutical industry industry
Power, close to the dispersibility of the 86.04% of advanced foreign technology, the more domestic public affairs of plating solution performance
Department is improved largely, and significantly improves coating surface glossiness and stability, though relatively abroad the most still
There is certain gap, but break external high-tech technology for promoting the silver-plated technology of domestic non-cyanide alkali
Monopolization, has the most pioneering and enthusiasm beyond doubt, has wide market prospect；
Can obtain the silvering of full sheet bright in mirror surface, current density range width, available surfacing,
Anti-discoloration is good, anticorrosive wear-resistant high, and binding force of cladding material is good, dispersibility and covering power
Good, electroplating wastewater processing is easier to, and safeguards simple, economical and practical.
Detailed description of the invention
A kind of silver plating process of non-cyanide alkali, technique is as follows:
Silver 10～12g/L
Sodium hydroxide 130～145g/L
Regulator 25～30ml/L
Open cylinder agent 6～8ml/L
Brightener 1～3ml/L
Wetting agent 0.1～0.3ml/L
Temperature 25～30 DEG C
Cathode-current density 2.0～3.5A/dm2
Anodic current density 1.0～2.0A/dm2
Filter continuously
Stirring air, movable cathode
Wherein, described brightener is spread out by polymine, imidazoles propoxyl group condensation substance, nitrogen heterocycles
Biology, modified aromatic aldehyde compound, epoxychloropropane and water prepare.
Described technique is supplemented in the future and is added: brightener 150～250ml/KAH, walk agent
50～70ml/KAH, regulator 5L/25 kilogram sodium hydroxide.
Described brightener is prepared by following steps: by 10～20 parts of polymine, 15～25
Part imidazoles propoxyl group condensation substance, 25～35 parts of nitrogen heterocycles derivants, 13～23 parts of modified aromatics
Aldehyde compound and 400～500 parts of water add in reactor, are warming up to 45 DEG C；By 70～80
Part epoxychloropropane adds in Dropping funnel, is slowly dropped in reactor and stirs reaction, reaction
Temperature is less than 45 DEG C, and time for adding is 3～5h；It is added dropwise to complete epoxy chloropropionate through step S2
After alkane, the temperature of reactor is increased to 80 DEG C, stirring reaction 6h, obtain brightener.
Described regulator is sodium gluconate；Described open cylinder agent is polyethylene polyamine and epoxy
Chloropropane addition product；Described wetting agent is sodium lauryl sulphate；The described agent that walks is for changing
Property polyvinyl alcohol addition product.
Beneficial effects of the present invention: a kind of environmental non-cyanide silver-plated plating of alkalescence that the present invention provides
Liquid dispersibility reaches 84.12%, the dispersion energy far above 59.4%～the 72.7% of domestic pharmaceutical industry industry
Power, close to the dispersibility of the 86.04% of advanced foreign technology, the more domestic public affairs of plating solution performance
Department is improved largely, and significantly improves coating surface glossiness and stability, though relatively abroad the most still
There is certain gap, but break external high-tech technology for promoting the silver-plated technology of domestic non-cyanide alkali
Monopolization, has the most pioneering and enthusiasm beyond doubt, has wide market prospect；
Can obtain the silvering of full sheet bright in mirror surface, current density range width, available surfacing,
Anti-discoloration is good, anticorrosive wear-resistant high, and binding force of cladding material is good, dispersibility and covering power
Good, electroplating wastewater processing is easier to, and safeguards simple, economical and practical.
Claims (4)
1. the silver plating process of a non-cyanide alkali, it is characterised in that technique is as follows:
Silver 10～12g/L
Sodium hydroxide 130～145g/L
Regulator 25～30ml/L
Open cylinder agent 6～8ml/L
Brightener 1～3ml/L
Wetting agent 0.1～0.3ml/L
Temperature 25～30 DEG C
Cathode-current density 2.0～3.5A/dm2
Anodic current density 1.0～2.0A/dm2
Filter continuously
Stirring air, movable cathode
Wherein, described brightener is spread out by polymine, imidazoles propoxyl group condensation substance, nitrogen heterocycles
Biology, modified aromatic aldehyde compound, epoxychloropropane and water prepare.
The silver plating process of a kind of non-cyanide alkali the most according to claim 1, it is characterised in that
Described technique in the future supplement add: brightener 150～250ml/KAH, the agent 50～70ml/KAH that walks,
Regulator 5L/25 kilogram sodium hydroxide.
The silver plating process of a kind of non-cyanide alkali the most according to claim 2, it is characterised in that
Described brightener is prepared by following steps: by 10～20 parts of polymine, 15～25 parts of miaows
Azoles propoxyl group condensation substance, 25～35 parts of nitrogen heterocycles derivants, 13～23 parts of modified aromatic aldehydes
Compound and 400～500 parts of water add in reactor, are warming up to 45 DEG C；By 70～80 parts of rings
Oxygen chloropropane adds in Dropping funnel, is slowly dropped in reactor and stirs reaction, reaction temperature
Less than 45 DEG C, time for adding is 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.
The silver plating process of a kind of non-cyanide alkali the most according to claim 2, it is characterised in that
Described regulator is sodium gluconate；Described open cylinder agent is polyethylene polyamine and epoxy chloropropionate
Alkane addition product；Described wetting agent is sodium lauryl sulphate；The described agent that walks is poly-for modification
Vinyl alcohol addition product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610567389.7A CN105951139A (en) | 2016-07-15 | 2016-07-15 | Non-cyanogen alkali silver plating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610567389.7A CN105951139A (en) | 2016-07-15 | 2016-07-15 | Non-cyanogen alkali silver plating process |
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| CN105951139A true CN105951139A (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610567389.7A Pending CN105951139A (en) | 2016-07-15 | 2016-07-15 | Non-cyanogen alkali silver plating process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604395A (en) * | 2017-10-26 | 2018-01-19 | 张娜 | A kind of silver-plated mode of non-cyanide alkali |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113386A (en) * | 1981-12-28 | 1983-07-06 | Sumitomo Electric Ind Ltd | Silver plating method |
| CN104988543A (en) * | 2015-08-06 | 2015-10-21 | 揭阳市比格莱化工有限公司 | Environment-friendly brightener for non-cyanide alkaline zinc plating and preparation method thereof |
| CN105063679A (en) * | 2015-08-06 | 2015-11-18 | 揭阳市比格莱化工有限公司 | Environment-friendly cyanide-free alkaline galvanizing electroplating liquid and galvanizing technology |
| CN105506683A (en) * | 2015-12-23 | 2016-04-20 | 苏州市金星工艺镀饰有限公司 | Cyanide-free silver plating electroplating bath |
-
2016
- 2016-07-15 CN CN201610567389.7A patent/CN105951139A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113386A (en) * | 1981-12-28 | 1983-07-06 | Sumitomo Electric Ind Ltd | Silver plating method |
| CN104988543A (en) * | 2015-08-06 | 2015-10-21 | 揭阳市比格莱化工有限公司 | Environment-friendly brightener for non-cyanide alkaline zinc plating and preparation method thereof |
| CN105063679A (en) * | 2015-08-06 | 2015-11-18 | 揭阳市比格莱化工有限公司 | Environment-friendly cyanide-free alkaline galvanizing electroplating liquid and galvanizing technology |
| CN105506683A (en) * | 2015-12-23 | 2016-04-20 | 苏州市金星工艺镀饰有限公司 | Cyanide-free silver plating electroplating bath |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604395A (en) * | 2017-10-26 | 2018-01-19 | 张娜 | A kind of silver-plated mode of non-cyanide alkali |
| 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: 20160921 |