CN102041530A - Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof - Google Patents
Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof Download PDFInfo
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- CN102041530A CN102041530A CN 200910110615 CN200910110615A CN102041530A CN 102041530 A CN102041530 A CN 102041530A CN 200910110615 CN200910110615 CN 200910110615 CN 200910110615 A CN200910110615 A CN 200910110615A CN 102041530 A CN102041530 A CN 102041530A
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Abstract
The invention relates to a protective clamp for the local metal plating of workpieces and a cyanide-free gold plating method thereof. The protective clamp for the local metal plating of workpieces comprises an upper cover and a lower cover holding a workpiece therebetween, and a locking mechanism firmly combining the upper cover and the lower cover; the upper cover comprises an upper cover body on which an opening is disposed corresponding to the local part of the workpiece to be plated; a primary sealing ring fitted with the periphery of the opening is disposed on the inner side of the upper cover body to isolate the local part of the workpiece to be plated from the local part without needing to be plated. According to the invention, the local part of the workpiece to be plated is isolated from the local part without needing to be plated, so the leakage of the plating solution is absolutely prevented and the accuracy of the periphery is greatly increased. Furthermore, no chemical substance is required; no contamination is caused to the surface of the workpiece; no recovery processing is required for chemical substances; so the protective clamp has the advantages of environmental protection and high efficiency. In addition, partial surface of the metal is subjected to gold-plating treatment with cyanide-free plating solution, wherein the solution is nontoxic and the treatment process is safe.
Description
Technical field
The present invention relates to the local cyanogen-less gold technology in a kind of metallic surface, more particularly, relate to a kind of partial shield jig and cyanogen-less gold method that need not metallizing of carrying out in the metallic surface protecting when partially plating gold belongs to.
Background technology
It is the wet film that does not need part coating one deck printing ink and so on of metallizing at workpiece surface that traditional partially plating gold belongs to method, carries out the plating operation after waiting it to parch, and does not have the part of printing ink to plate metal at workpiece.But this kind mode operates very complicated, needs a large amount of time, and because manual operations causes the edge tolerance range of metallic design very poor, influences the outward appearance and the performance of workpiece.And the employing machine operation can improve the tolerance range at edge, but apparatus expensive, cost height is unfavorable for actual use.
And another kind of traditional local electroplating technology is to be covered with one deck dry film on workpiece, and this dry film of exposure imaging forms the pattern of desiring the metallizing part, carry out the plating operation then, but plating takes place easily this method, and cost is very high.
Use at present the method that the fabrography partially plating gold belongs in addition, method as No. 01120700.0 disclosed utilization fabrography selectivity metallizing of Chinese invention patent application, this method adopts fabrography to form wet film at workpiece surface, with the egative film exposure technique with design transfer to wet film, wet film then hardens, the wet film that then exposes develops then, exposes the part of desiring to plate metal on the workpiece in wet film.This method has reduced the situation of plating, but very high to the requirement of the planarization of workpiece surface and workpiece shape, applicable surface is narrow.
The mode that above-mentioned partially plating gold belongs to all is to adopt chemical substance to cover workpiece surface, and these materials can pollute corrosion workpiece base material; And, to have plated and may have part after divesting and remain on the workpiece, these storages to the workpiece product all are disadvantageous.And the chemical substance of employing also needs to recycle, and causes environmental pollution, is unfavorable for energy-saving and emission-reduction.
Gold plate has flavous outward appearance, solidity to corrosion is good, electrical and thermal conductivity performance good, and stable, wear-resisting, is the ornamental and functional coat of a kind of very ideal.Therefore, gold-plated technology is widely used in the industrial production such as decoration, machinery, electronic component, increases the aesthetic appearance of product, and can improve the electrical property of product.
Use in traditional gold-plated technology history the earliest, most widely used be that prussiate is gold-plated, yet, contain the prussiate of severe toxicity in the plating bath of the gold-plated technology of prussiate, influence operator safety, produce serious environmental pollution and complicated production postprocessing working procedures.
Summary of the invention
The technical problem to be solved in the present invention is; need protect workpiece to need not the zone of plating with chemical substance at existing coating technology; pollute easily defectives such as workpiece surface, complicated operation, provide a kind of need not to need not the zone of plating, the shield jig that belongs to of the workpiece partially plating gold on polluted product surface not with chemical substance protection workpiece.
Further, the present invention also provides a kind of cyanogen-less gold method that can avoid using toxic substance.
The technical solution adopted for the present invention to solve the technical problems is: construct the shield jig that a kind of workpiece partially plating gold belongs to, comprise holding workpiece loam cake and lower cover and with described loam cake and the fastening bonded locking mechanism of lower cover therebetween;
Described loam cake comprises the loam cake main body, and described loam cake main body is provided with the local corresponding perforate with described workpiece plating metal; The inboard of described loam cake main body is provided with the periphery of described perforate the part and partial first sealing-ring that need not metallizing of the plating metal that cooperates, completely cuts off described workpiece.
In the shield jig that workpiece partially plating gold of the present invention belongs to, the inboard of described loam cake main body is to having the loam cake sidewall;
Described lower cover comprises the lower cover main body, and described lower cover main body upwards is provided with the lower cover sidewall that cooperates with described loam cake sidewall; Between described loam cake sidewall and described lower cover sidewall, be provided with second sealing-ring.
In the shield jig that workpiece partially plating gold of the present invention belongs to, described lower cover main body is provided with the upwards convex of the described workpiece of nipple support.
In the shield jig that workpiece partially plating gold of the present invention belongs to, the periphery of described convex is provided with and the contacted conductive ring of described workpiece, and described conductive ring passes described lower cover main body by conductive lead wire.
In the shield jig that workpiece partially plating gold of the present invention belongs to, described locking mechanism comprise " U " clevis, the slack adjuster of at least one side setting of described " U " clevis and be arranged on described loam cake or lower cover one side by the compressing member of described slack adjuster degree of tightness.
In the shield jig that workpiece partially plating gold of the present invention belongs to, described compressing member is the cross bar that is arranged on described loam cake one side.
In the shield jig that workpiece partially plating gold of the present invention belongs to, described first sealing-ring and second sealing-ring are silica gel sealing ring.
In the shield jig that workpiece partially plating gold of the present invention belongs to, an epitaxial lateral overgrowth of described lower cover main body is stretched and is provided with hook hole.
In the shield jig that workpiece partially plating gold of the present invention belongs to, described first sealing-ring is fitted and is arranged on the inboard of described loam cake main body, and is positioned at the peripheral region of described perforate; Perhaps described first sealing-ring is fastened on the periphery of described perforate.
Further, the present invention also provides a kind of cyanide-free plating bath prescription and uses this cyanide-free plating bath the metal local surfaces to be carried out the method for gold-plated processing.This method at first is placed on metal working part to be plated in the described shield jig, and by described shield jig described workpiece is clamped, and only exposes and treats gold-plated part; Then, the shield jig behind the described workpiece of clamping is immersed in the cyanide-free plating bath; Connect power supply and carry out plating.
This cyanide-free plating bath comprises the water-soluble gold compound of no cyanogen, sulphite, thiocarbamide, water etc.Especially, the water-soluble gold compound of this no cyanogen is gold sodium sulfide (Na
3Au (SO
3)
2) or citric acid gold potassium, its weight ratio is 1-40g; Sulphite is S-WAT (Na
2SO
3), its weight ratio is 1-100g; The weight ratio of thiocarbamide is 1-70g, and water is 1 liter.
The method that adopts this cyanide-free plating bath that the metal local surfaces is carried out gold-plated processing specifically comprises: at first, take by weighing all compounds in proportion in container, the adding distil water stirring and dissolving; Then, silver commemorative coin is clamped with the shield jig contraposition that above-mentioned workpiece partially plating gold belongs to, the anchor clamps that workpiece will be housed again hang on the hanger hook, oil removing cleans up the back and immerses in the plating bath, connect the conductive lead wire on supply lead and the anchor clamps, connect power supply and begin plating, the gold-plated part of the silver commemorative coin desire place of immersing plating bath has golden yellow the appearance gradually, until plating fully, plating finishes; At last, take out silver commemorative coin, remove anchor clamps after cleaning up, put into the dry partially plating gold that can finish silver commemorative coin of baking oven.
Implement the present invention and have following beneficial effect: by workpiece being placed between loam cake and the lower cover, and first sealing-ring is set at the periphery of the perforate of loam cake, the surface of first sealing-ring and workpiece is compressed, thereby it is the part of the plating metal of workpiece is isolated with the part that need not metallizing, definitely avoid the seepage of plating bath, improved the tolerance range at edge greatly; And, avoided prior art to form the defective of dry film or wet film at workpiece surface with chemical substance, therefore, can not cause any pollution to workpiece surface, also need not chemical substance is recycled etc., have environmental protection, advantage efficiently.To the metallic surface plating, toxic and environmental pollution degree have been avoided by this gold-plated technology effectively to operator.
In addition, the cyanide-free plating bath that the present invention uses carries out gold-plated processing to the metal local surfaces, and the environmental pollution damage of having avoided the prussiate plating bath to bring has nontoxic, operational safety, the good advantage of coating outward appearance.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the perspective exploded view of the omission locking mechanism of the shield jig that belongs to of workpiece partially plating gold of the present invention;
Fig. 2 is the solid assembling synoptic diagram of the omission locking mechanism of the shield jig that belongs to of workpiece partially plating gold of the present invention;
Fig. 3 is the decomposition cross-sectional schematic of the omission locking mechanism of the shield jig that belongs to of workpiece partially plating gold of the present invention;
Fig. 4 is the cross-sectional schematic of the shield jig of workpiece partially plating gold genus of the present invention.
Embodiment
As shown in Figures 1 to 4, be first embodiment of the shield jig that belongs to of workpiece partially plating gold of the present invention, comprise loam cake 10, lower cover 30 and with loam cake 10 and lower cover 30 fastening bonded locking mechanisms.This loam cake 10 comprises loam cake main body 11, and loam cake main body 11 is provided with the local corresponding perforate 12 with workpiece 70 plating metals; The inboard of loam cake main body 11 is provided with first sealing-ring 20 that cooperates with the periphery of perforate 12.Workpiece to be processed 70 is clamped between loam cake 10 and the lower cover 30, completely cuts off the part and the part that need not metallizing of the plating metal of workpiece 70 by first sealing-ring 20.
As shown in the figure, the loam cake main body 11 of present embodiment is circular, is complementary with the shape of workpiece 70; Understandable, when the shape of workpiece 70 not simultaneously, the shape of this loam cake main body 11 can be changed according to the shape of workpiece 70.The shape of the perforate 12 of this loam cake main body 11 is identical with the partial shape of the plating metal of workpiece 70, thereby makes plating bath to arrive on the local surfaces of plating metal of workpiece 70 by perforate 12, carries out metal deposition.Certainly, the shape of perforate 12 can change according to the partial shape of the plating metal of workpiece 70, conversion.First sealing-ring 20 is arranged on the inboard of loam cake main body 11, and cooperates with the periphery of perforate 12, exposes the position of this perforate 12.Can be between first sealing-ring 20 and the loam cake main body 11 by bonding, pressing, rivet, be fastened on variety of ways such as perforate 12 peripheries and be connected.
Further, the quantity of the perforate 12 of loam cake 10 can be offered according to the partial quantity of the plating metal of workpiece 70, and is provided with first sealing-ring 20 of cooperation at the periphery of each perforate 12.
This lower cover 30 comprises lower cover main body 31, is used for supporting workpiece 70.As shown in the figure, this lower cover main body 31 is provided with the upwards convex 32 of nipple support workpiece 70.And, be provided with conductive ring 33 in the periphery of convex 32, and conductive ring 33 passes lower cover main body 31 by conductive lead wire 34, insert power supply to conductive ring 33, be that workpiece 70 inserts power supplys.Certainly, the shape of conductive ring and shape that position, convex 32 be set can be carried out conversion as required.
Further, when the upper and lower surface of workpiece all needs partially plating gold to belong to, the structure of this lower cover 30 can according to the partial shape of plating metal according to the structure of loam cake 10 change accordingly, conversion.
In the present embodiment, because the edge of workpiece 70 need not to carry out metallizing, therefore, to being arranged with loam cake sidewall 13, the outline of the shape of loam cake sidewall 13 and workpiece 70 is complementary in the inboard of loam cake main body 11.Upwards be provided with the lower cover sidewall 35 that cooperates with loam cake sidewall 13 in lower cover main body 31.Further, between loam cake sidewall 13 and lower cover sidewall 35, be provided with second sealing-ring 40, thereby avoid infiltrating the slit of plating bath between loam cake sidewall 13 and lower cover sidewall 35.As shown in the figure, this lower cover sidewall 35 is positioned at the periphery of loam cake sidewall 13; Understandable, also loam cake sidewall 13 can be arranged on the periphery of lower cover sidewall 35.
Understandable, when the sidewall of workpiece 70 also needs to carry out metallizing, can omit loam cake sidewall 13 and lower cover sidewall 35, and first sealing-ring 20 fits tightly in the part that need not metallizing of workpiece 70 and gets final product.Certainly, can also increase the position that suitable locating mechanism (for example contraposition sign, alignment grooves etc.) is located the perforate 12 of workpiece 70 and loam cake main body 11.
Further, an epitaxial lateral overgrowth of this lower cover main body 31 is stretched and is provided with hook hole 36, thereby the convenient whole protecting anchor clamps are hooked immersed in the plating bath handled easily.
As shown in Figure 4, this locking mechanism comprises " U " clevis 51, " U " slack adjuster 52 that is provided with of a side of clevis 51 and by the compressing member 53 of slack adjuster 52 degrees of tightness.This compressing member is the cross bar that is arranged on loam cake 10 1 sides, is compressed on the loam cake main body 11.Corresponding, slack adjuster 52 is arranged on " U " upside of clevis 51, " U " downside of clevis 51 then supports the bottom surface of lower cover main body 31.During assembling, " U " downside of clevis 51 is supported on the bottom surface of lower cover main body 31, then the degree of tightness part is placed on the end face of loam cake main body 11, tightens slack adjuster 52 then, compresses compressing member 53, thereby with loam cake 10 and lower cover 30 lockings.
Understandable, slack adjuster 52 and compressing member 53 also can " U " both sides of clevis 51 are provided with simultaneously, thereby compress loam cake 10 and lower cover 30 at both direction.
Certainly, locking mechanism can also adopt other structure formation, for example, at loam cake sidewall 13 and lower cover sidewall 35 screw thread pair that matches is set, and locks loam cake 10 and lower cover 30 by the cooperation of screw thread pair.
In the present embodiment, this loam cake 10 and lower cover 30 adopt poly (methyl methacrylate) plate, thereby avoid the corrosion of plating bath; Certainly, the material of loam cake 10 and lower cover 30 also can be selected for use as required.And first sealing-ring 20 and second sealing-ring 40 adopt is silica gel, thus the part that need not metallizing of the workpiece 70 of can better fitting.Certainly, the material of first sealing-ring 20 and second sealing-ring 40 also can be selected as required.
In use, at first workpiece 70 is placed on the convex 32 of lower cover main body 31, loam cake 10 then closes, and make the part of plating metal of perforate 12 alignment pieces 70 of loam cake main body 11, at this moment, first sealing-ring 20 just in time separates the part of the plating metal of workpiece 70 with the part that need not metallizing.Then, use locking mechanism, the sealing-ring 20 of winning fitted tightly on the surface of workpiece 70 loam cake 10 and lower cover 30 lockings, thus with the part of the plating metal of workpiece 70 with need not the local thoroughly isolated of metallizing; Simultaneously, second sealing-ring 40 has also sealed the slit between loam cake sidewall 13 and the lower cover sidewall 35.The workpiece that to load onto shield jig then carries out oil removing and cleans up in the back immersion cyanide-free plating bath, to conductive ring 33, is connected to workpiece 70 by the 34 connection power supplys that go between, and then the beginning plating.After finishing plating, take out the workpiece of loading onto shield jig and clean, unclamp locking mechanism, can take out workpiece 70, carry out processing such as follow-up oven dry, packing.Whole process has definitely been avoided the seepage of plating bath, has improved the tolerance range at edge greatly; And, avoided prior art need form the defectives of dry films or wet film on workpiece 70 surfaces with chemical substance, therefore, can not cause any pollution to workpiece 70 surfaces, also need not chemical substance is recycled etc., have environmental protection, advantage efficiently.
Carry out gold-plated describing with silver commemorative coin below, plating bath is to adopt sulfurous acid gold complex salt non-cyanide electroless gold solution, its prescription: (weight ratio g)
Gold sodium sulfide (Na
3Au (SO
3)
2): 1-40g
S-WAT (Na
2SO
3): 1-100g
Ammonium chloride (NH
4Cl): 5-55g
Thiocarbamide: 1-70g
1 liter in water
Understandable, gold sodium sulfide can adopt the water-soluble gold compound of other no cyanogen to replace, as citric acid gold potassium; S-WAT can adopt other sulphite to replace.
Citric acid gold potassium: 1-40g
Ammonium citrate: 1-50g
S-WAT: 1-100g
Ammonium chloride): 5-55g
Thiocarbamide: 1-70g
1 liter in water
Below in conjunction with embodiment to plating bath with and make further instruction in the gold-plated method of metal local surfaces.
Embodiment one:
Gold sodium sulfide (Na
3Au (SO
3)
2) or citric acid gold potassium be 1g; Sodium sulfate (Na
2SO
3) be 1g; Ammonium chloride (NH
4Cl) be 5g; Thiocarbamide is 1g; Water is 1 liter.
At first, take by weighing all compounds in proportion in container, the adding distil water stirring and dissolving; Then, silver commemorative coin is clamped with the shield jig contraposition that above-mentioned workpiece partially plating gold belongs to, expose the part that to carry out metallizing, the anchor clamps that commemorative coin will be housed again hang on the hanger hook, and oil removing cleans up the back and immerses in the plating bath, connects the conductive lead wire on supply lead and the anchor clamps, connect power supply and begin plating, the gold-plated part of the silver commemorative coin desire place of immersing plating bath has golden yellow the appearance gradually, and until plating fully, plating finishes; At last, take out the anchor clamps that silver commemorative coin is housed, remove anchor clamps after cleaning up, put into the dry partially plating gold that can finish silver commemorative coin of baking oven.
Embodiment two:
Gold sodium sulfide (Na
3Au (SO
3)
2) or citric acid gold potassium be 40g; S-WAT (Na
2SO
3) be 100g; Ammonium chloride (NH
4Cl) be 55g; Thiocarbamide is 70g; Water is 1 liter.
At first, take by weighing all compounds in proportion in container, the adding distil water stirring and dissolving; Then, silver commemorative coin is clamped with the shield jig contraposition that above-mentioned workpiece partially plating gold belongs to, expose the part that to carry out metallizing, the anchor clamps that commemorative coin will be housed again hang on the hanger hook, and oil removing cleans up the back and immerses in the plating bath, connects the conductive lead wire on supply lead and the anchor clamps, connect power supply and begin plating, the gold-plated part of the silver commemorative coin desire place of immersing plating bath has golden yellow the appearance gradually, and until plating fully, plating finishes; At last, take out the anchor clamps that silver commemorative coin is housed, remove anchor clamps after cleaning up, put into the dry partially plating gold that can finish silver commemorative coin of baking oven.
Embodiment three:
Gold sodium sulfide (Na
3Au (SO
3)
2) or citric acid gold potassium be 21g; S-WAT (Na
2SO
3) be 50g; Ammonium chloride (NH
4Cl) be 30g; Thiocarbamide is 36g; Water is 1 liter.
At first, take by weighing all compounds in proportion in container, the adding distil water stirring and dissolving; Then, silver commemorative coin is clamped with the shield jig contraposition that above-mentioned workpiece partially plating gold belongs to, expose the part that to carry out metallizing, the anchor clamps that commemorative coin will be housed again hang on the hanger hook, and oil removing cleans up the back and immerses in the plating bath, connects the conductive lead wire on supply lead and the anchor clamps, connect power supply and begin plating, the gold-plated part of the silver commemorative coin desire place of immersing plating bath has golden yellow the appearance gradually, and until plating fully, plating finishes; At last, take out the anchor clamps that silver commemorative coin is housed, remove anchor clamps after cleaning up, put into the dry partially plating gold that can finish silver commemorative coin of baking oven.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the claim scope of the present invention.
Claims (10)
1. the shield jig that belongs to of a workpiece partially plating gold is characterized in that, comprises holding workpiece loam cake and lower cover and with described loam cake and the fastening bonded locking mechanism of lower cover therebetween;
Described loam cake comprises the loam cake main body, and described loam cake main body is provided with the local corresponding perforate with described workpiece plating metal; The inboard of described loam cake main body is provided with the periphery of described perforate the part and partial first sealing-ring that need not metallizing of the plating metal that cooperates, completely cuts off described workpiece.
2. the shield jig that workpiece partially plating gold according to claim 1 belongs to is characterized in that the inboard of described loam cake main body is to having the loam cake sidewall;
Described lower cover comprises the lower cover main body, and described lower cover main body upwards is provided with the lower cover sidewall that cooperates with described loam cake sidewall; Between described loam cake sidewall and described lower cover sidewall, be provided with second sealing-ring.
3. the shield jig that workpiece partially plating gold according to claim 2 belongs to is characterized in that, described lower cover main body is provided with the upwards convex of the described workpiece of nipple support.
4. the shield jig that workpiece partially plating gold according to claim 3 belongs to is characterized in that the periphery of described convex is provided with and the contacted conductive ring of described workpiece, and described conductive ring passes described lower cover main body by conductive lead wire.
5. the shield jig that workpiece partially plating gold according to claim 1 belongs to; it is characterized in that, described locking mechanism comprise " U " clevis, the slack adjuster of at least one side setting of described " U " clevis and be arranged on described loam cake or lower cover one side by the compressing member of described slack adjuster degree of tightness.
6. the shield jig that workpiece partially plating gold according to claim 5 belongs to is characterized in that described compressing member is the cross bar that is arranged on described loam cake one side.
7. the shield jig that belongs to according to each described workpiece partially plating gold of claim 2-6 is characterized in that described first sealing-ring and second sealing-ring are silica gel sealing ring.
8. the shield jig that workpiece partially plating gold according to claim 7 belongs to is characterized in that an epitaxial lateral overgrowth of described lower cover main body is stretched and is provided with hook hole; Described first sealing-ring is fitted and is arranged on the inboard of described loam cake main body, and is positioned at the peripheral region of described perforate; Perhaps described first sealing-ring is fastened on the periphery of described perforate.
9. a cyanogen-less gold method of using the shield jig of aforesaid right requirement is characterized in that, metal working part to be plated is placed in the described shield jig, and by described shield jig described workpiece is clamped, and only exposes and treats gold-plated part; Then, the shield jig behind the described workpiece of clamping is immersed in the cyanide-free plating bath; Connect power supply and carry out plating.
10. cyanogen-less gold method according to claim 9 is characterized in that, described cyanide-free plating bath comprises the water-soluble gold compound of no cyanogen, sulphite, thiocarbamide, water; Wherein, the water-soluble gold compound of described no cyanogen is gold sodium sulfide (Na
3Au (SO
3)
2) or citric acid gold potassium, its weight ratio is 1-40g; Described sulphite is S-WAT (Na
2SO
3), its weight ratio is 1-100g; The weight ratio of described thiocarbamide is 1-70g; Water is 1 liter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910110615 CN102041530B (en) | 2009-10-13 | 2009-10-13 | Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910110615 CN102041530B (en) | 2009-10-13 | 2009-10-13 | Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102041530A true CN102041530A (en) | 2011-05-04 |
| CN102041530B CN102041530B (en) | 2012-12-26 |
Family
ID=43908063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910110615 Expired - Fee Related CN102041530B (en) | 2009-10-13 | 2009-10-13 | Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102041530B (en) |
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| CN201520808U (en) * | 2009-10-13 | 2010-07-07 | 深圳国宝造币有限公司 | Shield jig for workpiece partially plated with metal |
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- 2009-10-13 CN CN 200910110615 patent/CN102041530B/en not_active Expired - Fee Related
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