Formula of trivalent chromium colored zinc passivator with strong antirust performance

A technology with anti-rust performance and trivalent chromium, which is applied in the direction of coating, metal material coating process, hot-dip plating process, etc., can solve difficult problems, achieve strong anti-rust performance, strong anti-corrosion performance, safety and environmental protection high performance effect

Pending Publication Date: 2022-07-15
SHENZHEN XINFUHUA SURFACE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the colored passivation film is obtained due to the action of hexavalent chromium ions. It is not easy to form a colored passivation film on the galvanized layer by using the trivalent chromium passivation process.

Method used

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  • Formula of trivalent chromium colored zinc passivator with strong antirust performance

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Embodiment 1

[0045] A formula of trivalent chromium color zinc passivation agent with strong anti-rust performance, weighing raw materials according to parts by weight:

[0046] Chromium chloride: 5 parts;

[0047] Citric acid: 5 parts;

[0048] Sodium nitrate: 5 parts;

[0049] Sodium chloride: 1 part;

[0050] Cerium sulfate: 0.5 part;

[0051] Blocking agent: 1 serving;

[0052] Deionized water: 20 parts;

[0053] The preparation method includes the following steps:

[0054] (1) dissolving chromium chloride in deionized water to obtain an aqueous solution containing trivalent chromium ions;

[0055] (2) add sodium nitrate, sodium chloride, cerium sulfate, blocking agent to the aqueous solution containing trivalent chromium ions, after stirring and dissolving, add citric acid again, fully stirring and dissolving, and finally adding a phosphoric acid solution with a concentration of 85% ( That is, 100 g of phosphoric acid solution contains 85 g of phosphoric acid) to adjust the pH ...

Embodiment 2

[0057] A formula of trivalent chromium color zinc passivation agent with strong anti-rust performance, weighing raw materials according to parts by weight:

[0058] Chromium sulfate: 30 parts;

[0059] 2,3-Dihydroxysuccinic acid: 20 parts;

[0060] Sodium nitrate: 20 parts;

[0061] Sodium chloride: 10 parts;

[0062] Cerium sulfate: 2 parts;

[0063] Sealing agent: 5 parts;

[0064] Deionized water: 65 parts;

[0065] The preparation method includes the following steps:

[0066] (1) dissolving chromium chloride in deionized water to obtain an aqueous solution containing trivalent chromium ions;

[0067] (2) Add sodium nitrate, sodium chloride, cerium sulfate, and a blocking agent to the aqueous solution containing trivalent chromium ions, and after stirring and dissolving, add 2,3-dihydroxysuccinic acid, and fully stir and dissolve. The final concentration is 85% phosphoric acid solution (ie 85 g phosphoric acid in 100 g phosphoric acid solution) adjusts the pH value o...

Embodiment 3

[0069] A formula of trivalent chromium color zinc passivation agent with strong anti-rust performance, weighing raw materials according to parts by weight:

[0070] Chromium chloride: 20 parts;

[0071] Gluconic acid: 15 servings;

[0072] Sodium nitrate: 10 parts;

[0073] Sodium chloride: 5 parts;

[0074] Cerium sulfate: 1.5 parts;

[0075] Sealing agent: 3 parts;

[0076] Deionized water: 50 parts;

[0077] The preparation method includes the following steps:

[0078] (1) dissolving chromium chloride in deionized water to obtain an aqueous solution containing trivalent chromium ions;

[0079] (2) add sodium nitrate, sodium chloride, cerium sulfate, blocking agent to the aqueous solution containing trivalent chromium ions, after stirring and dissolving, then add gluconic acid, fully stirring and dissolving, and finally adding a phosphoric acid solution with a concentration of 85% ( That is, 100 g of phosphoric acid solution contains 85 g of phosphoric acid) to adjust t...

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Abstract

The invention discloses a formula of a trivalent chromium colored zinc passivator with strong antirust performance, which comprises the following raw materials by weight: 5-30 parts of a film-forming agent; 5-20 parts of an organic complexing agent; 5-20 parts of an oxidizing agent; 1 to 10 parts of a film forming accelerant; 0.5 to 2 parts of a metal additive; 1-5 parts of a sealing agent; 20 to 65 parts of deionized water; the film-forming agent comprises soluble trivalent chromium salt. The passivator can form a uniform and compact colored passivation film on the surface of a zinc coating, the passivation film is bright in color and high in corrosion resistance, the zinc coating is effectively protected, then metal materials such as steel and iron are protected, and the antirust performance is high.

Description

technical field [0001] The invention relates to a passivating agent for galvanizing, in particular to a formula of a trivalent chromium color zinc passivating agent with strong anti-rust performance. Background technique [0002] Zinc is an active metal. If the surface is not treated after galvanizing, the zinc layer will react with water and oxygen in the air, the bright zinc surface will soon become dark, and the zinc layer will corrode. It affects the protection of the metal plating parts and makes the metal plating parts oxidize and rust, so it is necessary to passivate the galvanized layer, on the one hand to improve the corrosion resistance of the plated parts, and on the other hand to improve the appearance quality of the plated parts. The early passivation of galvanized layer is mainly based on hexavalent chromium salt passivation, which not only has excellent anti-corrosion effect but also is beautiful, but hexavalent chromium ion is highly toxic and will cause harm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/10C23C2/26C23C2/06C25D5/48C25D3/22
CPCC23C22/10C23C2/26C23C2/06C25D5/48C23C2222/20C23C2222/10C25D3/22
Inventor 邱永华
Owner SHENZHEN XINFUHUA SURFACE TECH CO LTD
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