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Non-cyanide silvering brightener and plating solution thereof

A silver light and solvent technology, applied in the field of cyanide-free silver plating, can solve the problems of excessive brittleness of the coating, unstable plating solution, weak selectivity, etc., and achieve the effect of good adhesion and low brittleness

Inactive Publication Date: 2011-05-25
济南德锡科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The American Techinic company proposed succinimide bright silver plating in German patent DE2610501, but the disadvantage is that succinimide will be hydrolyzed in alkaline aqueous solution, resulting in too brittle coating
The coating obtained in the U.S. Patent US5302278 has poor discoloration resistance; the coating in the Japanese Patent JP2000192279A is not very selective to metal salts, and the brightening effect is not ideal
Shanghai University adopts fluorocarbon surfactant in Chinese patent CN1680630A, but it is easy to cause cumulative effect, resulting in unstable plating solution
Patent CN 1676673A discloses "brightener for cyanide-free silver plating and its preparation method". Fluorocarbon surfactant is also used, which is easy to form accumulation and lead to unstable plating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The composition of cyanide-free silver plating brightener is as follows:

[0054] Sodium dodecyl dibenzene sulfonate 12g / L

[0055] β-naphthol polyoxyethylene ether 20g / L

[0056] HEDTA 1g / L

[0057] Potassium dihydrogen phosphate 1g / L

[0058] Urea 8g / L

[0059] Polyethylene glycol 800 12g / L

[0060] Furfurylthiopyrazine 60g / L

[0061] Cysteine ​​9g / L

[0062] The rest is water.

[0063] Preparation method:

[0064] In a container with stirring, first add 2\3 of the total amount of water, add the weighed sodium dodecyl dibenzene sulfonate, β-naphthol polyoxyethylene ether, and PEG into the water, stir until completely dissolved, and heat up After reaching 40°C, add the weighed HEDTA and stir until completely dissolved. Add furfuryl mercaptopyrazine, cysteine, urea and potassium dihydrogen phosphate into the above-mentioned uniformly stirred solution, continue to stir until completely dissolved, constant volume and stir for 2 hours to obtain a cyanide-free silver plating brightener. ...

Embodiment 2

[0076] The composition of cyanide-free silver plating brightener is as follows

[0077] Sodium dodecyl dibenzene sulfonate 14g / L

[0078] β-naphthol polyoxyethylene ether 22g / L

[0079] HEDTA 1.2g / L

[0080] Potassium dihydrogen phosphate 1.6g / L

[0081] Urea 12g / L

[0082] PEG1200 15g / L

[0083] Benzyl methyl sulfide 65g / L

[0084] Tryptophan 8g / L

[0085] The rest is water

[0086] The preparation method is the same as in Example 1.

[0087] The preparation and use method of the plating solution is the same as that of Example 1. It is possible to obtain a plated plate with full brightness in the middle and high areas and a slight omission in the low area. At the same time, the adhesion and brittleness of the plated plates are tested and show good performance.

Embodiment 3

[0089] The composition of cyanide-free silver plating brightener is as follows

[0090] Sodium dodecyl dibenzene sulfonate 16g / L

[0091] β-naphthol polyoxyethylene ether 26g / L

[0092] HEDTA 1.5g / L

[0093] Potassium dihydrogen phosphate 2g / L

[0094] Urea 13g / L

[0095] Polyethylene glycol 2000 15g / L

[0096] Benzyl methyl sulfide 62g / L

[0097] Glycine 8g / L

[0098] The rest is water

[0099] The preparation and use method of the plating solution is the same as that of Example 1, and a full-bright mirror plate can be obtained, which achieves the same effect as cyanide silver plating. At the same time, the adhesion and brittleness of the plated plate are tested and show good performance.

[0100] Comparing the brightness interval of the brightener of Example 3 of this patent and the commercially available brand cyanide silver-plating brightener, the results are as follows:

[0101] Brightness interval comparison:

[0102]

Example 3 Brightener

Commercially available cyanide silver plating...

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PUM

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Abstract

The invention relates to a non-cyanide silvering brightener and a plating solution thereof. The non-cyanide silvering brightener uses water as solvent and comprises the following main components: 10-20g / L of sodium dodecyldibenzenesulphonate, 15-30g / L of beta-naphthol ethoxylate, 0.8-2g / L of hydroxyethyl ethylenediamine triacetic acid (HEDTA), 0.5-3g / L of potassium dihydrogen phosphate, 5-15g / L of urea, 3-18g / L of polyethylene glycol, 40-80g / L of sulfur-containing heterocyclic compound and 5-15g / L of nitrogen-containing carboxylic acid. The brightener of the invention does not contain cyanide, the mirror surface of the coating is bright, the same effect of cyanide-containing silvering can be realized; the performance tests of the coating show that the color of the coating obtained by using the non-cyanide bright silvering plating solution of the invention is difficult to change, and the coating has low brittleness and good adhesive force and can meet the requirements on coating in different application aspects.

Description

Technical field [0001] The invention relates to the field of cyanide-free silver plating, in particular to a silver nitrate-thiosulfate-based cyanide-free silver plating brightener and its electroplating solution. Background technique [0002] Silver plating is a kind of precious metal plating, because the cost of silver plating is relatively low compared with gold plating, and it has high conductivity, light reflectivity and chemical stability to organic acids and alkalis, so it is widely used in decorative plating. , Functional electroplating of electronic devices. Due to the development of electronic technology in recent years, functional silver plating has grown rapidly. However, the highly toxic cyanide silver plating is still the mainstream of the silver plating industry at home and abroad. With the continuous improvement of environmental protection awareness, people urgently need to develop a mature non-cyanide silver plating process to replace the serious pollution of c...

Claims

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Application Information

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IPC IPC(8): C25D3/46
Inventor 曾凡亮宋邦强王凯铭
Owner 济南德锡科技有限公司
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