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Chromium-free passivating agent for galvanized plate with organosilane as main component and preparation process thereof

A technology of chromium-free passivation agent and organosilane, which is applied in the direction of metal material coating process, etc.

Active Publication Date: 2012-10-17
合肥华清高科表面技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because hexavalent chromium is a carcinogen, its products and its production process will cause serious harm to people and the environment. Therefore, countries around the world have begun to legislate to prohibit the use of chromate passivation technology or try to avoid it

Method used

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  • Chromium-free passivating agent for galvanized plate with organosilane as main component and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A chromium-free passivating agent for galvanized sheet with organosilane as the main component, with a volume of 1 liter, consisting of the following raw materials in weight ratio:

[0031] 1,2-bis(triethoxysilyl)ethane 15g / L

[0032] Sulfosalicylic acid 6g / L

[0033] Sodium metasilicate 3g / L

[0034] Sodium fluoride 2g / L

[0035] Sodium molybdate 2g / L

[0036] Cerium nitrate 0.5g / L

[0037] Sodium silicate 0.2g / L

[0038] water balance

[0039] Described a kind of organosilane is that the preparation method of chromium-free passivating agent for galvanized sheet of main component comprises the following steps:

[0040] (1) Take the 1,2-bis(triethoxysilyl)ethane in the above formula and add two-thirds of the water, stir well until it is completely dissolved, then add sulfosalicylic acid into it, stir well Prepare semi-finished product A;

[0041] (2) Take sodium metasilicate and add it to the remaining water, stir well until it is completely dissolved, then add ...

Embodiment 2

[0044] The chromium-free passivating agent for galvanized sheet with organosilane as the main component, in 1 liter volume, consists of the following raw materials in weight ratio:

[0045] 1,2-bis(triethoxysilyl)ethane 18.0g / L

[0046] Sulfosalicylic acid 7.0g / L

[0047] Sodium metasilicate 3.0g / L

[0048] Sodium Fluoride 2.0g / L

[0049] Sodium molybdate 5.0g / L

[0050] Cerium nitrate 0.3g / L

[0051] Sodium silicate 0.1g / L

[0052]water balance

[0053] Described a kind of organosilane is that the preparation method of chromium-free passivating agent for galvanized sheet of main component comprises the following steps:

[0054] (1) Take the 1,2-bis(triethoxysilyl)ethane in the above formula and add two-thirds of the water, stir well until it is completely dissolved, then add sulfosalicylic acid into it, stir well Prepare semi-finished product A;

[0055] (2) Take sodium metasilicate and add it to the remaining water, stir well until it is completely dissolved, then ad...

Embodiment 3

[0058] The chromium-free passivating agent for galvanized sheet with organosilane as the main component, in 1 liter volume, consists of the following raw materials in weight ratio:

[0059] 1,2-bis(triethoxysilyl)ethane 15g / L

[0060] Sulfosalicylic acid 6.0g / L

[0061] Sodium metaborate 3.0g / L

[0062] Sodium Fluoride 1.5g / L

[0063] Sodium molybdate 2.0g / L

[0064] Cerium chloride 0.6g / L

[0065] Sodium silicate 0.3g / L

[0066] water balance

[0067] Described a kind of organosilane is that the preparation method of chromium-free passivating agent for galvanized sheet of main component comprises the following steps:

[0068] (1) Take the 1,2-bis(triethoxysilyl)ethane in the above formula and add two-thirds of the water, stir well until it is completely dissolved, then add sulfosalicylic acid into it, stir well Prepare semi-finished product A;

[0069] (2) Take sodium metaborate and add it to the remaining water, fully stir until it is completely dissolved, then add s...

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Abstract

The invention discloses a chromium-free passivating agent for a galvanized plate and a preparation process thereof. The chromium-free passivating agent for a galvanized plate uses organosilane as a main component and comprises the following raw materials by weight: in terms of 1 L of the passivating agent, 15 to 20 g / L of organosilane, 6 to 10 g / L of sulfosalicylic acid, 3 to 5 g / L of an auxiliary film forming agent, 1 to 3 g / L of sodium fluoride, 1 to 5 g / L of sodium molybdate, 0.3 to 0.6 g / L of a rare-earth salt, 0.1 to 0.3 g / L of sodium silicate and a small amount of a pH adjusting agent, with the balance being water. The surface conditioning agent, i.e., the chromium-free passivating agent, has the advantages of capacity of performing passivation at normal temperature, a short passivation time, greenness, environment friendliness and no inclusion of hexavalent chromium heavy metal ions; and a compact three-dimensional reticular passive film formed by the chromium-free passivating agent substantially improves corrosion resistance of galvanized plates and has excellent coating binding force at the same time. The preparation process for the chromium-free passivating agent is simple and is convenient for practical production.

Description

technical field [0001] The present invention relates to a chromium-free passivator for galvanized sheet with organic silane as the main component, in particular to a chromium-free passivator for galvanized sheet coating pre-treatment for the purpose of improving coating adhesion and corrosion resistance Chromium-free passivation agent. Background technique [0002] Galvanizing the surface of the steel plate is a common method to improve the anti-corrosion ability of the steel plate. Since the galvanized layer is easily corroded to form white spots in the air, especially in a humid environment, it must be passivated after galvanizing to improve its corrosion resistance. After surface passivation, it can effectively prevent the formation of white rust and at the same time increase the gloss of the coating surface. Traditionally, chromate passivation treatment is generally used. This process is simple, low in cost, good in film adhesion, high in corrosion resistance, and has s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40
Inventor 郑松林刘万青饶丹
Owner 合肥华清高科表面技术股份有限公司
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