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Colorful trivalent chromium passivation liquid, preparation method and use method thereof

A passivation solution and trivalent chromium technology, applied in the direction of metal material coating process, etc., can solve the problems of large porosity of passivation film, short service life, poor corrosion resistance, etc., and achieve stable passivation working solution and production cost. Low, good corrosion resistance effect

Active Publication Date: 2015-04-08
HUNAN JINYU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the passivation solution is not stable enough during use and has a short service life. The passivation film obtained in the later stage of use has the disadvantages of large void ratio, poor corrosion resistance, and low adhesion.

Method used

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  • Colorful trivalent chromium passivation liquid, preparation method and use method thereof
  • Colorful trivalent chromium passivation liquid, preparation method and use method thereof
  • Colorful trivalent chromium passivation liquid, preparation method and use method thereof

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Embodiment 1-10

[0051] Examples 1-10 respectively provide the composition of the trivalent chromium color passivation solution of the present invention, specifically as listed in Table 1, wherein the unit of the ingredients is g / L.

[0052] Table 1 embodiment 1-10 formula composition

[0053]

[0054] The preparation method of the passivation solution of the above examples 1-10 is as follows: taking the preparation of 1000ml passivation solution as an example, the following steps are successively included: add 600ml deionized water into a 2000ml beaker, add nitric acid and citric acid, stir until dissolved, and mix well; Add chromium sulfate hexahydrate, cobalt sulfate heptahydrate, and sodium chlorate, and stir until completely dissolved; add ammonium fluoride, and stir until completely dissolved; add deionized water until the total volume of the solution is 1000ml, and stir well to obtain the three Chromium color passivation solution.

Embodiment 14

[0067] With the trivalent chromium color passivation solution 100ml of embodiment 6, at 25 ℃, carry out passivation treatment to 100 above-mentioned test pieces successively, passivation time is 60 seconds, after the test piece after passivation is washed through 60 ℃ of deionized water, Dry with hot air at 60°C. It was observed that the passivation status of each test piece was better, and the color was consistent. The 10th, 30th, 50th, 70th, and 100th piece were taken for neutral salt spray corrosion test, and the passivation effect listed in Table 3 could be achieved.

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Abstract

The invention provides a colorful trivalent chromium passivation liquid. A plurality of raw materials are dissolved in deionized water to form the passivation liquid. The passivation liquid comprises the following components by a ratio: 5-9 g / L chromium sulfate hexahydrate, 2-4 g / L cobalt sulfate heptahydrate, 4-8 g / L sodium chlorate, 2-3 g / L ammonium fluoride, 1-2 g / L of nitric acid, 2-3 g / L citric acid, and the balance of water. The resulting passive film has good corrosion resistance, the time can be up to 120 hours or more in a salt spray test, the surface has no any white rust or white spots, the porosity is low, and a blocking agent does not need to be used for treating.

Description

technical field [0001] The invention relates to the field of metal surface treatment agents, in particular to a trivalent chromium color passivation solution, a preparation method and a use method thereof. Background technique [0002] The galvanized layer is one of the most important protective coatings for steel parts. The galvanized layer is very stable in a dry environment, but in a high-temperature and high-humidity environment, the galvanized layer has poor corrosion resistance and is prone to white rust or white spots . Generally, high-concentration or medium-concentration chromate solution is used for passivation to improve the corrosion resistance of the galvanized layer. In recent years, in order to reduce the pollution of hexavalent chromium to the environment and the harm to the human body, the chromate passivation of the zinc coating is developing in the direction of trivalent chromium salt and chromate-free passivation. [0003] Chinese patent application 20...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C22/34C23C2222/10
Inventor 桂成方
Owner HUNAN JINYU ENVIRONMENTAL PROTECTION TECH CO LTD
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