Chromium-free passivation solution as well as preparation method and application thereof

A chromium-free passivation and reaction technology, applied in the field of materials, can solve the problems of the technical application limitation of chromium-free passivation agent for steel, uneven film formation on the metal surface, poor adhesion of the passivation film, etc., and achieve excellent storage stability. And the effect of stability in use, excellent adhesion, and excellent weather resistance

Pending Publication Date: 2022-03-11
GUANGZHOU HKS SURFACE TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these chromium-free passivators generally have disadvantages such as poor stability, easy precipitation when heated, uneven film formation on the metal surface, low adhesion, and poor bonding of the passivation film. The corrosion resistance of the finished products is lower than that of chromate passivation products, which greatly limits the technical application of chromium-free passivators for steel

Method used

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  • Chromium-free passivation solution as well as preparation method and application thereof
  • Chromium-free passivation solution as well as preparation method and application thereof
  • Chromium-free passivation solution as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The chromium-free passivation solution in this example includes the following components by weight: 2 parts of silane coupling agent, 2 parts of tetraalkoxysilane, 6 parts of lithium polysilicate, 10 parts of cationic urethane resin emulsion , 5 parts of titanate and / or titanium-containing compound, 4 parts of corrosion inhibitor, 6 parts of chelating agent, 100 parts of distilled water; the silane coupling agent is HYDROSIL2776 produced by Guangzhou Jianyi Chemical Import and Export Co., Ltd.; cationic urethane The ester resin is ethyl formate resin containing primary amino groups; the titanate and / or titanium-containing compound is ammonium fluorotitanate; the corrosion inhibitor is benzotriazole; and the chelating agent is nitrilotriacetic acid.

[0057] The chromium-free passivation solution in this example is prepared by the following preparation method, comprising the following steps:

[0058] (1) Add 100 parts of distilled water into the container and heat it to ...

Embodiment 2

[0063] The chromium-free passivation solution in this example includes the following components by weight: 3 parts of silane coupling agent, 3 parts of tetraalkoxysilane, 4 parts of lithium polysilicate, 12 parts of cationic urethane resin emulsion , 4 parts of titanate, 3 parts of corrosion inhibitor, 5 parts of chelating agent, 100 parts of distilled water; the silane coupling agent is HYDROSIL2776 produced by Guangzhou Jianyi Chemical Import and Export Co., Ltd.; the cationic urethane resin emulsion is Secondary amino ethyl formate resin; titanate is potassium fluotitanate; corrosion inhibitor is rosin-based imidazoline; chelating agent is sodium edetate.

Embodiment 3

[0065] The chromium-free passivation solution in this example includes the following components by weight: 2 parts of silane coupling agent, 4 parts of tetraalkoxysilane, 2 parts of lithium polysilicate, 8 parts of cationic urethane resin emulsion , 5 parts of titanate, 6 parts of corrosion inhibitor, 3 parts of chelating agent, 100 parts of distilled water; the silane coupling agent is HYDROSIL2776 produced by Guangzhou Jianyi Chemical Import and Export Co., Ltd.; the cationic urethane resin emulsion is Secondary amino ethyl formate resin; titanate is potassium titanate; corrosion inhibitor is thioureidoimidazole; chelating agent is ammonium citrate.

[0066] The preparation method of the chromium-free passivation solution in Example 2 and Example 3 is prepared with reference to the preparation method of the chromium-free passivation solution in Example 1.

[0067] The chromium-free passivation solution in Examples 1 to 3 of the present invention is suitable for use as a pass...

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Abstract

The invention provides a chromium-free passivation solution as well as a preparation method and application thereof. The chromium-free passivation solution comprises the following components in parts by weight: 1.5-4 parts of a silane coupling agent, 1.5-5 parts of tetraalkoxy silane, 1.5-7.5 parts of lithium polysilicate, 6-15 parts of an ethyl carbamate resin emulsion, 3-6 parts of titanate and/or a titanium-containing compound, 2-8 parts of a corrosion inhibitor, 2-6 parts of a chelating agent and 80-120 parts of water. The chromium-free passivation solution does not contain chromate and is good in stability and high in drying speed, and a formed passivation film is colorless, uniform and transparent and has good corrosion resistance and excellent weather resistance. The chromium-free passivation solution does not generate precipitates when being heated to 60 DEG C, has excellent storage stability and use stability and can be stored and used for a long time, the time of white rust appearing on a formed passivation film during a salt spray test is longer than 120 h, and the time of red rust appearing on the formed passivation film during the salt spray test is longer than 240 h.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a chromium-free passivation solution and a preparation method and application thereof. Background technique [0002] Steel is easily rusted or even completely damaged in air, water or soil, and the annual loss of steel due to corrosion accounts for about one-tenth of the entire steel production. Galvanizing the surface of steel is a common method to improve the anti-corrosion ability of steel plates, but in a humid environment, the galvanized layer is prone to corrosion and forms white loose corrosion products, which seriously affects the performance of galvanized parts, so it must be passivated after galvanizing treatment to improve its corrosion resistance. The traditional passivation treatment mostly adopts chromate passivation, which is widely used due to its simple process, good corrosion resistance and self-healing ability. However, hexavalent chromium is hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/82C23C2/02C23C2/06C23C2/26
CPCC23C22/05C23C22/82C23C2/02C23C2/06C23C2/26
Inventor 罗迎花张月牛艳丽蒲海丽蔡志华周阳亮
Owner GUANGZHOU HKS SURFACE TREATMENT CO LTD
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