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Brightening agent for cyanogen-free silver-plating and its preparing method

A cyanide-free silver plating and brightener technology, which is applied in the field of silver electroplating process and cyanide-free silver plating brightener, can solve the problems of unsatisfactory brightening effect, poor resistance to discoloration of the coating, and difficult maintenance of the plating solution. To achieve the effect of strong bonding, smooth surface, high corrosion resistance and wear resistance

Inactive Publication Date: 2005-10-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But U.S. Patent No. 5,302,278 has poor discoloration resistance of the coating; U.S. Patent No. 4,925,491 has many types of polishing components and wetting agents, which makes it difficult to maintain the plating solution; Strong, the effect of brightening is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: the composition and content of cyanide-free silver plating brightener are as follows:

[0014] Dithiosemicarbazide solution 35g / L

[0015] O-phenanthroline 15g / L

[0016] Sodium dodecyl diphenyl ether sulfonate 2g / L

[0017] Fluorocarbon surfactant 5g / L

[0018] Polyethylene glycol 18g / L

[0019] Dilute the above substances with water or distilled water to 1 liter, which is the brightener.

[0020] The preparation method of the brightener is as follows: dissolve 15 grams of phenanthroline in ethanol, and dissolve 35 grams of thiosemicarbazide in distilled water at 55° C.; then add thiosemicarbazide to the aforementioned prepared phenanthroline solution, magnetically stirred, and left to stand for 18 hours after stirring; in addition, 2 grams of sodium dodecyl diphenyl ether sulfonate, 5 grams of fluorocarbon surfactant and 18 grams of polyethylene glycol were dissolved in distilled water at 55 ° C. Then add it to t...

Embodiment 2

[0021] Embodiment two: the configuration process of the brightener in this embodiment is the same as that in the first embodiment, the difference is that the content of the brightener is different, as follows:

[0022] Dithiosemicarbazide solution 45g / L

[0023] O-phenanthroline 20g / L

[0024] Sodium dodecyl diphenyl ether sulfonate 3g / L

[0025] Fluorocarbon surfactant 7g / L

[0026] Polyethylene glycol 20g / L

Embodiment 3

[0027] Embodiment three: the configuration process of the brightener in this embodiment is the same as that in the first embodiment, the difference is that the composition content of the brightener is different, specifically as follows:

[0028] Dithiosemicarbazide solution 50g / L

[0029] O-phenanthroline 12g / L

[0030] Sodium dodecyl diphenyl ether sulfonate 4g / L

[0031] Fluorocarbon surfactant 8g / L

[0032] Polyethylene glycol 25g / L

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Abstract

9This invention refers to a kind of brightener of non-cyanogen deposited silver. To more specifically speaking, it is about the brightener which is used in the technology of AgNO3 - thiosulfate series non-cyanogen depositing silver. It belongs to the field of silver electro-plating technology. The components and their contents are: diaminothiourea 35-55 g / L, orthophenanthroline 10-20 g / L, dodecyl-dephenyl oxide-mahogany 1-5 g / L, fluorocarbon sufactant 3-10 g / L, polyethylene glycol 15-30g / L. Then dilute these substances with water or distilled water until the volume reaches 1L. The we will get the brightener. You can fill this brightener into AgNO3 - sodium thiosulfate series non-cyanogen deposition silver solution, and by electric deposition in the way of impulse, you can get mirror surface bright deposited plate whose surface is smooth, and whose performance of keeping color is excellent. Also, the plate is hard enough to resist corrosion and sanding, and it has strong binding force with the base body.

Description

technical field [0001] The invention relates to the field of a brightener for cyanide-free silver plating, more precisely, it relates to a silver nitrate-thiosulfate system brightener used in a cyanide-free silver plating process and a preparation method thereof, belonging to silver electroplating technology field. Background technique [0002] Among all precious metal electroplating, silver electroplating is the most widely used and used in the largest amount. With the development of electronic industry technology, the amount of silver used in electroplating is increasing day by day. So far, the most successful and widely used plating solution for silver electroplating is still the alkaline cyanide system. With the continuous improvement of environmental awareness, cyanide silver plating will be eliminated. Since the research of cyanide-free silver plating in the 1970s, although certain results have been obtained, the process is still immature. In terms of cyanide-free si...

Claims

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Application Information

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IPC IPC(8): C25D3/46
Inventor 成旦红苏永堂曹铁华李科军
Owner SHANGHAI UNIV
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