CN105112952A - Electroplating solution for non-cyanide silver electrodeposition, and electroplating method - Google Patents
Electroplating solution for non-cyanide silver electrodeposition, and electroplating method Download PDFInfo
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- CN105112952A CN105112952A CN201510604843.7A CN201510604843A CN105112952A CN 105112952 A CN105112952 A CN 105112952A CN 201510604843 A CN201510604843 A CN 201510604843A CN 105112952 A CN105112952 A CN 105112952A
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Abstract
The invention provides an electroplating solution for non-cyanide silver electrodeposition, and an electroplating method. The electroplating solution for non-cyanide silver electrodeposition comprises 80-100 g/L of silver nitrate, 20-30 g/L of stannous monosulphate, 42-60 g/L of niacinamide, 60-80 g/L of sodium thiosulfate, 30-46 g/L of sodium pyrosulfite, 0.2-0.5 g/L of thiosemicarbazide, and 0.1-0.5 g/L of polyethyleneglycol. The electroplating solution for non-cyanide silver electrodeposition is excellent in stability and dispersity, free of toxic substances, safe and environmental-friendly; through the adoption of the electroplating method, a cladding is smooth and compact in surface, excellent in discoloration resistance and corrosion resistance, and favorable in binding force with a base body, and application requirements in various fields such as decorative plating and functional electroplating can be met.
Description
Technical field
The present invention relates to electroplating technology field, particularly relate to a kind of non-cyanide silver coating electroplate liquid 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 non-cyanide silver coating electroplate liquid, non-cyanide silver coating electricity consumption bath stability of the present invention and dispersiveness is excellent, not containing highly toxic substance, safety and environmental protection.
A kind of non-cyanide silver coating electroplate liquid comprises Silver Nitrate 80 ~ 100g/L, stannous sulfate 20 ~ 30g/L, Buddhist nun gram acyl ammonium 42 ~ 60g/L, Sulfothiorine 60 ~ 80g/L, Sodium Pyrosulfite 30 ~ 46g/L, thiosemicarbazide 0.2 ~ 0.5g/L, polyoxyethylene glycol 0.1 ~ 0.5g/L.
Preferably, Silver Nitrate 86 ~ 92g/L, stannous sulfate 22 ~ 26g/L, Buddhist nun gram acyl ammonium 45 ~ 52g/L, Sulfothiorine 66 ~ 70g/L, Sodium Pyrosulfite 38 ~ 42g/L, thiosemicarbazide 0.2 ~ 0.3g/L, polyoxyethylene glycol 0.2 ~ 0.4g/L is comprised.
Preferably, Silver Nitrate 88g/L, stannous sulfate 24g/L, Buddhist nun gram acyl ammonium 46g/L, Sulfothiorine 68g/L, Sodium Pyrosulfite 38g/L, thiosemicarbazide 0.3g/L, polyoxyethylene glycol 0.3g/L is comprised.
Preferably, described non-cyanide silver coating electroplate liquid pH value is 4 ~ 5.
The present invention provides a kind of electro-plating method using above-mentioned non-cyanide silver coating electroplate liquid on the other hand, the plating of this electro-plating method is adopted to obtain coating surface smooth, fine and close, anti-discoloration and excellent corrosion resistance, good with basal body binding force, meet the application that decorative electroplating and functional plating etc. are multi-field.
An electro-plating method for above-mentioned non-cyanide silver coating electroplate liquid, comprises the following steps:
(1) nicotinamide, thiosemicarbazide and polyoxyethylene glycol are dissolved in deionized water are made into mixed solution, Silver Nitrate and stannous sulfate is added again in described mixed solution, stir, add the deionization of Sulfothiorine, Sodium Pyrosulfite and surplus, obtained non-cyanide silver coating electroplate liquid; Wherein, Silver Nitrate 80 ~ 100g/L, stannous sulfate 20 ~ 30g/L, Buddhist nun gram acyl ammonium 42 ~ 60g/L, Sulfothiorine 60 ~ 80g/L, Sodium Pyrosulfite 30 ~ 46g/L, thiosemicarbazide 0.2 ~ 0.5g/L, polyoxyethylene glycol 0.1 ~ 0.5g/L;
(2) do anode with silver plate, workpiece does negative electrode, electroplates.
Preferably, in step (2), electroplating process is temperature 20 ~ 40 DEG C, and current density is 10 ~ 20mA/cm
2under carry out.
Preferably, in described step (2), the area ratio of negative electrode and positive electrode is (1/2 ~ 2): 1.
Preferably, in step (2), the distance of negative electrode and positive electrode is 6 ~ 12cm.
Compared with prior art, beneficial effect of the present invention: non-cyanide silver coating electricity consumption bath stability of the present invention and dispersiveness is excellent, not containing highly toxic substance, safety and environmental protection; The plating of this electro-plating method is adopted to obtain coating surface smooth, fine and close, anti-discoloration and excellent corrosion resistance, good with basal body binding force, 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 non-cyanide silver coating electroplate liquid of the present embodiment comprises following component:
The electro-plating method of above-mentioned non-cyanide silver coating electroplate liquid is as follows:
Nicotinamide, thiosemicarbazide and polyoxyethylene glycol are dissolved in deionized water and are made into mixed solution, in described mixed solution, add Silver Nitrate and stannous sulfate again, stir, add the deionization of Sulfothiorine, Sodium Pyrosulfite and surplus, obtained non-cyanide silver coating electroplate liquid, regulates PH to 4 ~ 5; Wherein, Silver Nitrate 80g/L, stannous sulfate 20g/L, Buddhist nun gram acyl ammonium 42g/L, Sulfothiorine 60g/L, Sodium Pyrosulfite 30g/L, thiosemicarbazide 0.2g/L, polyoxyethylene glycol 0.1g/L;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 10cm, is 30 DEG C at non-cyanide silver coating temperature of electroplating solution, and current density is 15mA/cm
2electroplate under condition, obtain coating.
Embodiment 2: the non-cyanide silver coating electroplate liquid of the present embodiment comprises following component:
The electro-plating method of above-mentioned non-cyanide silver coating electroplate liquid is as follows:
Nicotinamide, thiosemicarbazide and polyoxyethylene glycol are dissolved in deionized water and are made into mixed solution, in described mixed solution, add Silver Nitrate and stannous sulfate again, stir, add the deionization of Sulfothiorine, Sodium Pyrosulfite and surplus, obtained non-cyanide silver coating electroplate liquid, regulates PH to 5; Wherein, Silver Nitrate 86g/L, stannous sulfate 22g/L, Buddhist nun gram acyl ammonium 45g/L, Sulfothiorine 66g/L, Sodium Pyrosulfite 38g/L, thiosemicarbazide 0.3g/L, polyoxyethylene glycol 0.2g/L;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 8cm, is 35 DEG C at non-cyanide silver coating temperature of electroplating solution, and current density is 18mA/cm
2electroplate under condition, obtain coating.
Embodiment 3: the non-cyanide silver coating electroplate liquid of the present embodiment comprises following component:
The electro-plating method of above-mentioned non-cyanide silver coating electroplate liquid is as follows:
Nicotinamide, thiosemicarbazide and polyoxyethylene glycol are dissolved in deionized water and are made into mixed solution, in described mixed solution, add Silver Nitrate and stannous sulfate again, stir, add the deionization of Sulfothiorine, Sodium Pyrosulfite and surplus, obtained non-cyanide silver coating electroplate liquid, regulates PH to 4; Wherein, Silver Nitrate 88g/L, stannous sulfate 24g/L, Buddhist nun gram acyl ammonium 46g/L, Sulfothiorine 68g/L, Sodium Pyrosulfite 38g/L, thiosemicarbazide 0.3g/L, polyoxyethylene glycol 0.3g/L;
Do anode with silver plate, workpiece does negative electrode, and the distance of negative electrode and anode is 8cm, is 28 DEG C at non-cyanide silver coating temperature of electroplating solution, and current density is 12mA/cm
2electroplate under condition, obtain coating.
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 non-cyanide silver coating electroplate liquid 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 that non-cyanide silver coating electricity consumption bath stability of the present invention is good by above-mentioned test result; Electroplate outer smooth, the fine and close light of the coating obtained, anti-discoloration is excellent, good with basal body binding force, meets the application that decorative electroplating and functional plating etc. are multi-field.
Non-cyanide silver coating electricity consumption bath stability of the present invention and dispersiveness is excellent, not containing highly toxic substance, safety and environmental protection; The plating of this electro-plating method is adopted to obtain coating surface smooth, fine and close, anti-discoloration and excellent corrosion resistance, good with basal body binding force, meet 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 (8)
1. a non-cyanide silver coating electroplate liquid, it is characterized in that, comprise Silver Nitrate 80 ~ 100g/L, stannous sulfate 20 ~ 30g/L, Buddhist nun gram acyl ammonium 42 ~ 60g/L, Sulfothiorine 60 ~ 80g/L, Sodium Pyrosulfite 30 ~ 46g/L, thiosemicarbazide 0.2 ~ 0.5g/L, polyoxyethylene glycol 0.1 ~ 0.5g/L.
2. non-cyanide silver coating electroplate liquid according to claim 1, it is characterized in that, comprise Silver Nitrate 86 ~ 92g/L, stannous sulfate 22 ~ 26g/L, Buddhist nun gram acyl ammonium 45 ~ 52g/L, Sulfothiorine 66 ~ 70g/L, Sodium Pyrosulfite 38 ~ 42g/L, thiosemicarbazide 0.2 ~ 0.3g/L, polyoxyethylene glycol 0.2 ~ 0.4g/L.
3. non-cyanide silver coating electroplate liquid according to claim 1, it is characterized in that, comprise Silver Nitrate 88g/L, stannous sulfate 24g/L, Buddhist nun gram acyl ammonium 46g/L, Sulfothiorine 68g/L, Sodium Pyrosulfite 38g/L, thiosemicarbazide 0.3g/L, polyoxyethylene glycol 0.3g/L.
4. non-cyanide silver coating electroplate liquid according to claim 1, is characterized in that, described non-cyanide silver coating electroplate liquid pH value is 4 ~ 5.
5. an electro-plating method for non-cyanide silver coating electroplate liquid according to claim 1, is characterized in that, comprise the following steps:
(1) nicotinamide, thiosemicarbazide and polyoxyethylene glycol are dissolved in deionized water are made into mixed solution, Silver Nitrate and stannous sulfate is added again in described mixed solution, stir, add the deionization of Sulfothiorine, Sodium Pyrosulfite and surplus, obtained non-cyanide silver coating electroplate liquid; Wherein, Silver Nitrate 80 ~ 100g/L, stannous sulfate 20 ~ 30g/L, Buddhist nun gram acyl ammonium 42 ~ 60g/L, Sulfothiorine 60 ~ 80g/L, Sodium Pyrosulfite 30 ~ 46g/L, thiosemicarbazide 0.2 ~ 0.5g/L, polyoxyethylene glycol 0.1 ~ 0.5g/L;
(2) do anode with silver plate, workpiece does negative electrode, electroplates.
6. electro-plating method according to claim 5, 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.
7. electro-plating method according to claim 5, is characterized in that, in described step (2), the area ratio of negative electrode and positive electrode is (1/2 ~ 2): 1.
8. electro-plating method according to claim 5, is characterized in that, in step (2), the distance of negative electrode and positive electrode is 6 ~ 12cm.
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Cited By (2)
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| CN106757213A (en) * | 2016-11-15 | 2017-05-31 | 惠州市力道电子材料有限公司 | A kind of electroplate liquid and its electro-plating method of non-cyanide silver coating tin alloy |
| CN107245734A (en) * | 2017-07-25 | 2017-10-13 | 安徽瑞泰汽车零部件有限责任公司 | A kind of non-cyanide silver coating electroplate liquid |
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Cited By (2)
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| CN107245734A (en) * | 2017-07-25 | 2017-10-13 | 安徽瑞泰汽车零部件有限责任公司 | A kind of non-cyanide silver coating electroplate liquid |
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Application publication date: 20151202 |