CN105483766A - Cyanide-free silver-electroplating solution and electroplating method thereof - Google Patents
Cyanide-free silver-electroplating solution and electroplating method thereof Download PDFInfo
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- CN105483766A CN105483766A CN201410470423.XA CN201410470423A CN105483766A CN 105483766 A CN105483766 A CN 105483766A CN 201410470423 A CN201410470423 A CN 201410470423A CN 105483766 A CN105483766 A CN 105483766A
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Abstract
The invention discloses a cyanide-free silver-electroplating solution and an electroplating method thereof. The silver-electroplating solution comprises 40-90 g/L of silver-containing salt, 10-20 g/L of potassium carbonate, 50-200 g/L of a complexing agent, 0.3-1 g/L of an additive, and a pH buffering agent, with the balance being deionized water. The cyanide-free silver-electroplating solution has good stability, is free of extremely toxic substances, and is safe and eco-friendly. The obtained electroplated layer is excellent in combination and discolouration resistance, and flat and bright in appearance, and can be applied to fields, such as decoration electroplating and functional electroplating.
Description
Technical field
The present invention relates to electroplating technology field, particularly relate to a kind of cyanogen-free silver-plating solution and electro-plating method thereof.
Background technology
Silvered film is easy to polishing, there are very strong reflective ability and good heat conduction, conduction, welding property, high to the chemical stability of organic bronsted lowry acids and bases bronsted lowry, and its price is cheap relative to other precious metals, has been widely used in the field of electronic industry, ornament, tableware and various artwork.
The advantages such as current efficiency is high, dispersive ability good, covering power is strong owing to having, coating crystallization is careful, at present, mostly still adopt both at home and abroad and have cyanogen silver plating process to electroplate silver layer.But prussiate silver plating liquid has hypertoxicity, serious environment pollution, the health of the harm producer, and also treatment cost of waste liquor is higher, so people wish to replace prussiate electrosilvering technique with other electroplating technology.But the problems such as the non-cyanide silver coating system ubiquity bath stability used at present is poor, coating performance is lower; therefore from the viewpoint of safety, environment protection etc., a kind of low toxicity, stable silver plating liquid and silver plating process is developed to replace the of far-reaching significance and extremely urgent of prussiate electrosilvering.
Summary of the invention
In view of this, one aspect of the present invention provides a kind of cyanogen-free silver-plating solution, cyanogen-free silver-plating solution good stability of the present invention, not containing highly toxic substance, safety and environmental protection.
This cyanogen-free silver-plating solution comprises the deionized water of silver salt 40 ~ 90g/L, salt of wormwood 10 ~ 20g/L, complexing agent 50 ~ 200g/L, additive 0.3 ~ 1g/L, PH buffer reagent, surplus.
Preferably, this cyanogen-free silver-plating solution comprises the deionized water of silver salt 70g/L, salt of wormwood 16g/L, complexing agent 150g/L, additive 0.5g/L, PH buffer reagent, surplus.
Preferably, complexing agent is one or both mixture in tetra-sodium sylvite, tetra-sodium sodium salt.
Preferably, additive is polyamine compound.
Preferably, PH buffer reagent is one or both mixture in dipotassium hydrogen phosphate or Sodium phosphate dibasic.
The present invention provides a kind of electro-plating method using above-mentioned cyanogen-free silver-plating solution on the other hand, and the method plating obtains coating and combines good, and flat appearance light, anti-discoloration are excellent, meet the application that decorative electroplating and functional plating etc. are multi-field.
The above-mentioned cyanogen-free silver-plating solution electric plating method of a kind of use, comprises the following steps:
(1) salt of wormwood 10 ~ 20g, complexing agent 50 ~ 200g are dissolved in deionized water and are made into mixed solution, PH buffer reagent regulates ph value of mixture, silver salt 40 ~ 90g is added again in this mixed solution, cyanogen-free silver-plating solution is made in stirring, finally add the deionized water of electroplating additive 0.3 ~ 1g and surplus to solution 1L, set aside for use after stirring;
(2) do anode with silver plate, workpiece does negative electrode, electroplates.
Preferably, in step (1), pH value is 4 ~ 6.
Preferably, in step (2), electroplating process is temperature 20 ~ 40 DEG C, and current density is 10 ~ 20mA/cm
2under carry out.
Preferably, in step (2), the distance of negative electrode and positive electrode is 6 ~ 12cm.
Cyanogen-free silver-plating solution of the present invention comprises the deionized water of silver salt 40 ~ 90g/L, salt of wormwood 10 ~ 20g/L, complexing agent 50 ~ 200g/L, additive 0.3 ~ 1g/L, PH buffer reagent, surplus.Cyanogen-free silver-plating solution good stability of the present invention, not containing highly toxic substance, safety and environmental protection; Electroplating the coating obtained combines good, and flat appearance light, anti-discoloration are excellent, meet the application that decorative electroplating and functional plating etc. are multi-field.
Embodiment
Further illustrate technical scheme of the present invention respectively below in conjunction with the embodiments.
Raw material involved in following examples is commercially available.
Embodiment 1: the cyanogen-free silver-plating solution of the present embodiment comprises following component:
Use this cyanogen-free silver-plating solution electro-plating method as follows:
Salt of wormwood 10g, complexing agent 50g are dissolved in deionized water and are made into mixed solution, mixed solution PH to 4 ~ 6 are regulated with PH buffer reagent, silver salt 40g is added again in this mixed solution, stirring and dissolving makes cyanogen-free silver-plating solution, the deionized water finally adding electroplating additive 0.3g and surplus is 1L to liquor capacity, set aside for use after stirring;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 6 ~ 12cm, and cyanogen-free silver-plating solution temperature 20 ~ 40 DEG C, current density is 10 ~ 20mA/cm
2electroplate under condition.
Embodiment 2: the cyanogen-free silver-plating solution of the present embodiment comprises following component:
Use this cyanogen-free silver-plating solution electro-plating method as follows:
Salt of wormwood 15g, complexing agent 100g are dissolved in deionized water and are made into mixed solution, mixed solution PH to 4 ~ 6 are regulated with PH buffer reagent, silver salt 60g is added again in this mixed solution, stirring and dissolving makes cyanogen-free silver-plating solution, the deionized water finally adding electroplating additive 0.5g and surplus is 1L to liquor capacity, set aside for use after stirring;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 6 ~ 12cm, and cyanogen-free silver-plating solution temperature 20 ~ 40 DEG C, current density is 10 ~ 20mA/cm
2electroplate under condition.
Embodiment 3: the cyanogen-free silver-plating solution of the present embodiment comprises following component:
Use this cyanogen-free silver-plating solution electro-plating method as follows:
Salt of wormwood 20g, complexing agent 200g are dissolved in deionized water and are made into mixed solution, mixed solution PH to 4 ~ 6 are regulated with PH buffer reagent, silver salt 90g is added again in this mixed solution, stirring and dissolving makes cyanogen-free silver-plating solution, the deionized water finally adding electroplating additive 1g and surplus is 1L to liquor capacity, set aside for use after stirring;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 6 ~ 12cm, and cyanogen-free silver-plating solution temperature 20 ~ 40 DEG C, current density is 10 ~ 20mA/cm
2electroplate under condition.
Testing method is as follows:
1, the displacement laboratory qualitative of copper is adopted to detect the stability of cyanogen-free silver-plating solution
In order to verify the content of free silver ions in the stability of cyanogen-free silver-plating solution and plating solution, carry out the displacement experiment of Copper Foil, control temperature is in electroplating temperature scope, workpiece is put into electroplate liquid, the change of workpiece surface is observed under well-beaten condition, when workpiece surface occurs that white dirt settling then proves that electroplate liquid can not tolerate displacement experiment, the stability of electroplate liquid can be verified by displacement experiment.
2, visual method is adopted to evaluate the statement state of coating
3, K is adopted
2the anti-tarnishing ability of S immersion test inspection coating
Coating is SO in an atmosphere
2, H
2under the effect of the corrosive mediums such as S, can make that Surface Creation is faint yellow, tawny even the silver sulfide film of chocolate.After coating color, not only affect outward appearance, the more important thing is that contact resistance increases, affect electroconductibility, and cause welding difficulty, reduce use value.In order to verify the discoloration-resisting of coating more accurately, carry out K
2s solution soaking is tested, and uses the K of 0.1mol/L at normal temperatures
2s solution coating, the changing conditions of record coating color in immersion, the anti-tarnishing ability of more various coating.
4, the bonding strength of test piece bending test coating is used
After workpiece plating, by workpiece repeatedly 90-degree bent, observe whether have peeling, stripping, break-off.
Above-mentioned test result is as following table
Find cyanogen-free silver-plating solution good stability of the present invention by above-mentioned test result and do not contain highly toxic substance, safety and environmental protection; Electroplating the coating obtained combines good, and the fine and closely woven smooth of outward appearance, anti-discoloration is excellent, meets the application that decorative electroplating and functional plating etc. are multi-field.
It should be noted that and understand, when not departing from the spirit and scope of accompanying claim the present invention for required protection, various amendment and improvement can be made to the present invention of foregoing detailed description.Therefore, the scope of claimed technical scheme is not by the restriction of given any specific exemplary teachings.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (9)
1. a cyanogen-free silver-plating solution, is characterized in that, comprises the deionized water of silver salt 40 ~ 90g/L, salt of wormwood 10 ~ 20g/L, complexing agent 50 ~ 200g/L, additive 0.3 ~ 1g/L, PH buffer reagent, surplus.
2. cyanogen-free silver-plating solution according to claim 1, is characterized in that, comprises the deionized water of silver salt 70g/L, salt of wormwood 16g/L, complexing agent 150g/L, additive 0.5g/L, PH buffer reagent, surplus.
3. cyanogen-free silver-plating solution according to claim 1, is characterized in that, described complexing agent is one or both mixture in tetra-sodium sylvite, tetra-sodium sodium salt.
4. cyanogen-free silver-plating solution according to claim 1, is characterized in that, described additive is polyamine compound.
5. cyanogen-free silver-plating solution according to claim 1, is characterized in that, described PH buffer reagent is one or both mixture in dipotassium hydrogen phosphate or Sodium phosphate dibasic.
6. use the electroplate liquid electric plating method described in claim 1, it is characterized in that, comprise the following steps:
(1) salt of wormwood 10 ~ 20g, complexing agent 50 ~ 200g are dissolved in deionized water and are made into mixed solution, PH buffer reagent regulates ph value of mixture, silver salt 40 ~ 90g is added again in this mixed solution, cyanogen-free silver-plating solution is made in stirring, finally add the deionized water of electroplating additive 0.3 ~ 1g and surplus to solution 1L, set aside for use after stirring;
(2) do anode with silver plate, workpiece does negative electrode, electroplates.
7. electro-plating method according to claim 6, is characterized in that, described in step (1), pH value is 4 ~ 6.
8. electro-plating method according to claim 6, is characterized in that, in step (2), electroplating process is temperature 20 ~ 40 DEG C, and current density is 10 ~ 20mA/cm
2under carry out.
9. electro-plating method according to claim 6, is characterized in that, in step (2), the distance of negative electrode and positive electrode is 6 ~ 12cm.
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| CN201410470423.XA CN105483766A (en) | 2014-09-15 | 2014-09-15 | Cyanide-free silver-electroplating solution and electroplating method thereof |
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| CN201410470423.XA CN105483766A (en) | 2014-09-15 | 2014-09-15 | Cyanide-free silver-electroplating solution and electroplating method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313084A (en) * | 2017-08-10 | 2017-11-03 | 佛山市南博旺环保科技有限公司 | A kind of alkaline non-cyanide plate silver plating solution and silver-coating method |
-
2014
- 2014-09-15 CN CN201410470423.XA patent/CN105483766A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313084A (en) * | 2017-08-10 | 2017-11-03 | 佛山市南博旺环保科技有限公司 | A kind of alkaline non-cyanide plate silver plating solution and silver-coating method |
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