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Sulfate trivalent chromium electroplating solution and preparation method thereof

A technology of trivalent chromium and electroplating solution, applied in the field of electroplating, which can solve the problems of slow plating deposition rate, white appearance of the plating layer, and failure to meet the requirements, etc., and achieve the effects of superior throwing ability, fast deposition rate of the plating layer, and good solubility

Inactive Publication Date: 2016-06-15
济南德锡科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a trivalent chromium sulfate electroplating solution and a preparation method thereof, aiming at solving the problem that the existing trivalent chromium electroplating products are dark in color, the deposition rate of the coating is relatively slow, and the appearance of the coating is whitish after long-time electroplating , which cannot meet the requirements.

Method used

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  • Sulfate trivalent chromium electroplating solution and preparation method thereof
  • Sulfate trivalent chromium electroplating solution and preparation method thereof
  • Sulfate trivalent chromium electroplating solution and preparation method thereof

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preparation example Construction

[0046] Such as figure 1 Shown, the preparation method of the sulfate trivalent chromium electroplating solution of the embodiment of the present invention may further comprise the steps:

[0047] S101: Soak the tank body with 1% by volume sulfuric acid and clean it;

[0048] S102: inject about 80% pure water into the tank, and heat to 55°C;

[0049] S103: Add the required amount of conductive salt and buffer salt, and stir the bath to ensure complete dissolution;

[0050] S104: adding a certain amount of complexed trivalent chromium ion solution;

[0051] S105: Mix well and adjust the pH value to 3.5 with 25% sodium hydroxide solution, and test repeatedly until it is stable;

[0052] S106: Add a predetermined amount of brightener, wetting agent and accelerator, etc., and electrolytic test plating can be performed.

[0053] The working principle of the present invention will be described in detail below.

[0054] In the present invention, the conductive component and the b...

Embodiment 1

[0057] Sodium sulfate 200g / L Boric acid 90g / L, basic chromium sulfate 60g / L, malic acid 15g / L, formic acid 1g / L, thiourea 0.005g / L, sodium saccharin reaction product 3g / L, sodium allyl sulfonate 0.5g / L, 0.5g / L sodium dihexyl succinate sulfonate, and the rest is water.

Embodiment 2

[0059] Potassium sulfate 210g / L, boric acid 100g / L, basic chromium sulfate 60g / L, malic acid 15g / L, formic acid 1g / L, thiourea 0.005g / L, sodium saccharin 3g / L, sodium allylsulfonate 0.5 g / L, sodium dihexyl sulfonate 0.5g / L, and the rest is water.

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Abstract

The invention discloses a sulfate trivalent chromium electroplating solution and a preparation method thereof. Ionic solution; add a predetermined amount of brightener, wetting agent and accelerator, then electrolytic test plating. The sulfate trivalent chromium electroplating solution includes: conductive salt 150g / L~250g / L, buffer salt 60g / L~120g / L, trivalent chromium ion 5g / L~20g / L, complexing agent 10g / L~ 20g / L, brightener 0.1g / L~1g / L, C~S compound 1g / L~5g / L, saccharin sodium reactant 1g / L~4g / L, wetting agent 0.1g / L~1g / L. The invention improves the performance of the sulfate trivalent chromium electroplating process; the obtained trivalent chromium plating layer is white and fine, has fast deposition rate of the plating layer, and has excellent covering ability and throwing ability.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a sulfate trivalent chromium electroplating solution and a preparation method thereof. Background technique [0002] Chromium plating occupies an extremely important position in the electroplating process and is listed as one of the three major plating types. For a long time, hexavalent chromium plating solution has been used for chrome plating. However, the toxicity of hexavalent chromium is about 100 times that of trivalent chromium, and it cannot be degraded. Long-term intake will cause diseases such as squamous cell carcinoma, sarcoma and adenocarcinoma. Hexavalent chromium wastewater and waste cannot be degraded naturally in nature like cyanide, and accumulate in the human body and organisms. The incubation period of its harm is long. It is a highly toxic carcinogen and a serious corrosive medium. As countries around the world pay more and more attention...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D3/10
CPCC25D3/06C25D3/10
Inventor 骆祖文张爱玲王鲁艳
Owner 济南德锡科技有限公司
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