Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof

A technology for protecting fixtures and parts, applied in the field of protecting fixtures, can solve the problems of easy contamination of the workpiece surface and complicated operation, and achieve the effects of good appearance of the coating, safe operation, and avoidance of toxicity and environmental pollution.

Inactive Publication Date: 2012-12-26
SHENZHEN GUOBAO MINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for protecting the workpiece without using chemical substances without plating, aiming at defects such as the need to use chemical substances to protect the area of ​​the workpiece that does not need to be plated, the surface of the workpiece is easy to be polluted, and the operation is complicated. Partially metal-plated protective fixtures for workpieces that do not pollute the surface of the product

Method used

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  • Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof
  • Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof
  • Protective clamp for local metal plating of workpiece and cyanide-free gold plating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Sodium gold sulfite (Na 3 Au(SO 3 ) 2 ) or gold potassium citrate is 1g; sodium sulfite (Na 2 SO 3 ) is 1g; ammonium chloride (NH 4 Cl) is 5g; thiourea is 1g; water is 1 liter.

[0060] First, weigh all the compounds in proportion to the container, add distilled water to stir and dissolve; then, clamp the silver commemorative coin with the protective fixture that is partially metal-plated above the workpiece, exposing the part that needs to be metal-plated, and then put the The fixture of the commemorative coin is hung on the hanger hook. After degreasing and cleaning, immerse in the plating solution, connect the power cord and the conductive lead on the fixture, turn on the power and start plating, and place the silver commemorative coin immersed in the plating solution to be gold-plated Gradually golden yellow appears until it is completely plated, and the plating is over; finally, take out the jig containing the silver commemorative coin, clean it, remove the ji...

Embodiment 2

[0062] Sodium gold sulfite (Na 3 Au(SO 3 ) 2 ) or gold potassium citrate is 40g; sodium sulfite (Na 2 SO 3 ) is 100g; ammonium chloride (NH 4 Cl) is 55g; thiourea is 70g; water is 1 liter.

[0063] First, weigh all the compounds in proportion to the container, add distilled water to stir and dissolve; then, clamp the silver commemorative coin with the protective fixture that is partially metal-plated above the workpiece, exposing the part that needs to be metal-plated, and then put the The fixture of the commemorative coin is hung on the hanger hook. After degreasing and cleaning, immerse in the plating solution, connect the power cord and the conductive lead on the fixture, turn on the power and start plating, and place the silver commemorative coin immersed in the plating solution to be gold-plated Gradually golden yellow appears until it is completely plated, and the plating is over; finally, take out the jig containing the silver commemorative coin, clean it, remove t...

Embodiment 3

[0065] Sodium gold sulfite (Na 3 Au(SO 3 ) 2 ) or gold potassium citrate is 21g; sodium sulfite (Na 2 SO 3 ) is 50g; ammonium chloride (NH 4 Cl) is 30g; thiourea is 36g; water is 1 liter.

[0066] First, weigh all the compounds in proportion to the container, add distilled water and stir to dissolve; then, clamp the silver commemorative coin with the protective fixture for partial metal plating of the above-mentioned workpiece, exposing the part that needs to be metal-plated, and then put the The fixture of the commemorative coin is hung on the hanger hook. After degreasing and cleaning, immerse in the plating solution, connect the power cord and the conductive lead on the fixture, turn on the power and start plating, and place the silver commemorative coin immersed in the plating solution to be gold-plated Gradually golden yellow appears until it is completely plated, and the plating is over; finally, take out the jig containing the silver commemorative coin, clean it, r...

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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 [0001] The invention relates to a partial cyanide-free gold plating technology on a metal surface, more specifically, a protective fixture for protecting a part that does not need to be metal-plated when the metal surface is partially metal-plated and a cyanide-free gold-plating method. Background technique [0002] The traditional partial metal plating method is to apply a layer of wet film such as ink on the part of the surface of the workpiece that does not need to be metallized, and then perform the plating operation after it dries out, and then coat the part of the workpiece that does not have ink with metal. However, this method is very complicated to operate and requires a lot of time, and due to manual operation, the edge accuracy of the metal plating pattern is very poor, which affects the appearance and performance of the workpiece. The use of machine operation can improve the accuracy of the edge, but the equipment is expensive and the cost is high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/02C25D3/48
Inventor 车宏伟刘晓静钱亮鄢国平陈建军于丽华王晓燕彭磊
Owner SHENZHEN GUOBAO MINT
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