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A kind of blue-white passivator of high salt spray resistance galvanized layer and its preparation method and passivation treatment method

A technology of passivation treatment and galvanized layer, which is applied in the coating process of metal materials, etc., can solve the problems of poor salt spray resistance, complicated process flow, difficult operation and control, etc., so as to prolong the service life, reduce production costs, and improve The effect of film formation speed

Inactive Publication Date: 2017-12-08
武汉吉和昌新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, most trivalent chromium passivation processes cannot have both high corrosion resistance and good decoration, poor salt spray resistance, complex process flow, and difficult operation control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A blue-white passivation agent for highly salt-spray-resistant galvanized layer, using 1L deionized water as solvent, the solute includes the following components: chromium nitrate 10g / L, oxalic acid 2.5g / L, malic acid 2g / L , nitrilotriacetic acid 1.5g / L, potassium hydroxide 3g / L, cobalt nitrate 3g / L, sodium tungstate 0.6g / L, lanthanum nitrate 0.3g / L, γ-aminopropyltriethoxysilane 4g / L .

[0017] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 300mL deionized water in the reaction vessel, add 10g of chromium nitrate after heating to 55°C and stir until completely dissolved, then Add 2.5g of oxalic acid, 2g of malic acid, 1.5g of nitrilotriacetic acid in turn, and stir thoroughly; (2) Slowly add 3g of potassium hydroxide under constant stirring, then raise the temperature of the solution to 70°C, and stir for 1 hour, then add 3g of cobalt nitrate, 0.6g of s...

Embodiment 2

[0020] A blue-white passivation agent for highly salt-spray-resistant galvanized layer, with 1L deionized water as solvent, the solute includes the following components: chromium nitrate 12g / L, oxalic acid 3.5g / L, malic acid 3g / L , nitrilotriacetic acid 2.5g / L, potassium hydroxide 4g / L, cobalt nitrate 2.5g / L, sodium tungstate 0.6g / L, lanthanum nitrate 0.35g / L, γ-aminopropyltriethoxysilane 2g / L L.

[0021] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 400mL deionized water in the reaction vessel, add 12g of chromium nitrate after heating to 55°C and stir until completely dissolved, then Add 3.5g oxalic acid, 3g malic acid, and 2.5g nitrilotriacetic acid in sequence, and stir thoroughly; (2) Slowly add 4g potassium hydroxide under constant stirring, then raise the temperature of the solution to 75°C, and stir for 1.5 hours under heat preservation , then add 2.5g...

Embodiment 3

[0024] A blue-white passivation agent for high salt-spray resistant galvanized layer, with 1L deionized water as solvent, the solute includes the following components: chromium nitrate 15g / L, oxalic acid 3g / L, malic acid 3g / L, Nitrilotriacetic acid 2g / L, potassium hydroxide 4g / L, cobalt nitrate 3g / L, sodium tungstate 0.5g / L, lanthanum nitrate 0.4g / L, γ-aminopropyltriethoxysilane 2.2g / L.

[0025] The preparation method of the above-mentioned blue-white passivator for the high salt-spray resistant galvanized layer comprises the following steps: (1) first add 500mL deionized water in the reaction vessel, add 15g of chromium nitrate after heating to 57°C and stir until completely dissolved, then Add 3g of oxalic acid, 3g of malic acid, 2g of nitrilotriacetic acid in sequence, and stir fully; (2) slowly add 4g of potassium hydroxide under continuous stirring, then heat the solution to 75°C, and stir for 2 hours under heat preservation, Then add 3g of cobalt nitrate, 0.5g of sodium ...

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Abstract

The invention provides a blue-white passivation agent for a high salt spray galvanized layer and its preparation method and passivation treatment method. The passivation agent uses deionized water as a solvent, and the solute includes a component whose concentration is as follows: nitric acid Chromium 10-20g / L, oxalic acid 2.5-4g / L, malic acid 2-4g / L, nitrilotriacetic acid 1.5-3g / L, potassium hydroxide 3-5g / L, cobalt nitrate 2-3g / L, tungstic acid Sodium 0.5-0.8g / L, lanthanum nitrate 0.25-0.4g / L, γ-aminopropyltriethoxysilane 0.4-4g / L. The passivating agent of the present invention greatly improves the salt spray corrosion resistance of the galvanized parts while making the plating solution free of hexavalent chromium, and at the same time makes the plated parts have a beautiful blue-white film layer to improve decoration, The preparation method and passivation operation process are simple and easy to control.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a blue-white passivator for a highly salt-spray-resistant galvanized layer, a preparation method thereof, and a passivation treatment method. Background technique [0002] All kinds of galvanized steel parts are widely used in building materials, auto parts, home appliances and other fields because of their excellent corrosion resistance and low price. However, simple galvanized steel parts are prone to corrosion in humid environments, which seriously affects the appearance and corrosion resistance of their products. In order to improve this shortcoming, the traditional method is to use chromate passivation treatment. Chromium in the passivation film mainly exists in the form of hexavalent chromium, and the passivation film has a self-repairing ability, so its corrosion resistance is relatively high. However, hexavalent chromium is highly toxic and carcinogenic,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/46
Inventor 宋文超左正忠戴建和杨娟李玉梁江茜
Owner 武汉吉和昌新材料股份有限公司
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