Organic-inorganic environment-friendly composite color passivation solution and preparation method thereof

A passivation solution, composite technology, applied in the direction of metal material coating process, etc., can solve the problems of poor stability and corrosion resistance of passivation film, poor adhesion and heat resistance, complex process operation, etc., to achieve passivation The effect of simple treatment process, strong film adhesion and simple passivation process

Inactive Publication Date: 2020-04-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicate passivation has good application prospects, but the stability and corrosion resistance of the passivation film are poor, and the silicate system needs to be further improved; the cost of the rare earth salt passivation system is too high, and the process operation is complicated and the efficiency is low. Low; the appearance of the film obtained by titanium salt passivation is very close to that of chromate passivation, but the corrosion resistance is poorer than that of chromate; while the effect of molybdate passivation is better, its cost is higher
In the common chromium-free passivation process, organic passivation has better corrosion resistance, but poor adhesion and heat resistance, and the corrosion resistance of single inorganic passivation is slightly worse than organic passivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The content and components of the organic-inorganic environmental protection composite color passivation solution in this embodiment are: 20g / L sodium molybdate, 1g / L sodium fluorosilicate, 4ml / L nitric acid, 1g / L2-undecyl-N -Carboxymethyl-N-hydroxy-imidazoline, 5g / L sodium citrate, 5g / L citric acid, 3mL / L hydrogen peroxide, 3ml / L sodium dodecyl sulfate, 3ml / L aminotrimethylene phosphoric acid, The rest is water with a pH of 4.

[0020] The preparation method of the organic-inorganic environmental protection composite color passivation solution in this example is as follows: first, a certain amount of sodium molybdate (20g), sodium fluorosilicate (1g), nitric acid (4ml), 2-undecyl -N-carboxymethyl-N-hydroxy-imidazoline (1g), sodium citrate (5g), citric acid (5g), hydrogen peroxide (3mL), sodium lauryl sulfate (3ml), aminotrimethylene Add phosphonic acid (3ml) into a beaker filled with 500ml of deionized water, mix well, and finally set the volume to 1L to obtain an org...

Embodiment 2

[0027] The content and components of the organic-inorganic environmental protection composite color passivation solution in this embodiment are: 30g / L sodium molybdate, 2g / L sodium fluorosilicate, 5ml / L nitric acid, 2g / L2-undecyl-N -Carboxymethyl-N-hydroxy-imidazoline, 6g / L sodium citrate, 6g / L citric acid, 4ml / L hydrogen peroxide, 4ml / L sodium dodecyl sulfate, 3.5ml / L aminotrimethylene phosphoric acid , and the rest is water with a pH of 5.

[0028] The preparation method of the organic-inorganic environment-friendly composite color passivation solution in this example is as follows: first, a certain amount of sodium molybdate (30g), sodium fluorosilicate (2g), nitric acid (5ml), 2-undecyl -N-carboxymethyl-N-hydroxy-imidazoline (2g), sodium citrate (6g), citric acid (6g), hydrogen peroxide (4mL), sodium lauryl sulfate (4ml), aminotrimethylene Add phosphonic acid (3.5ml) into a beaker filled with 500ml deionized water, then mix evenly, and finally add water to make the volume...

Embodiment 3

[0035]The content and components of the organic-inorganic environmental protection composite color passivation solution in this embodiment are: 35g / L sodium molybdate, 2g / L sodium fluorosilicate, 6ml / L nitric acid, 2g / L2-undecyl-N -Carboxymethyl-N-hydroxy-imidazoline, 7g / L sodium citrate, 7g / L citric acid, 5ml / L hydrogen peroxide, 5ml / L sodium dodecyl sulfate, 4ml / L aminotrimethylene phosphoric acid, The rest is water with a pH of 4.

[0036] The preparation method of the organic-inorganic environment-friendly composite color passivation solution in this example is as follows: first, a certain amount of sodium molybdate (35g), sodium fluorosilicate (2g), nitric acid (6ml), 2-undecyl -N-carboxymethyl-N-hydroxy-imidazoline (2g), sodium citrate (7g), citric acid (7g), hydrogen peroxide (5mL), sodium lauryl sulfate (5ml), aminotrimethylene Add phosphonic acid (4ml) into a beaker filled with 500ml of deionized water, mix well, and finally set the volume to 1L to obtain an organic-...

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PUM

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Abstract

The invention discloses an organic-inorganic environment-friendly composite color passivation solution and a preparation method thereof, and belongs to the technical field of metal material surface treatment. The passivation solution comprises the following components: 20-35 g/L of sodium molybdate, 1-2 g/L of sodium fluosilicate, 4-6 g/L of nitric acid, 1-2 g/L of 2-undecyl-N-carboxymethyl-N-hydroxyl-imidazoline, 5-7 g/L of sodium citrate, 5-7 g/L of citric acid, 3-5 mL/L of hydrogen peroxide, 3-5 mL/L of lauryl sodium sulfate, 3-4 mL/L of amino trimethylene phosphonic acid, and the balance water; and the pH value is 4-5. A zinc plating passivation film treated by the passivation solution is bright in color and uniform in color and film layer thickness; the passivation solution contains no trivalent chromium, hexavalent chromium and other harmful substances, and is environment-friendly, free of pollution, simple in passivation process, high in passivation efficiency and excellent in film layer corrosion resistance.

Description

technical field [0001] The invention relates to an organic-inorganic environment-friendly composite color passivation solution and a preparation method thereof, belonging to the technical field of metal material surface treatment. Background technique [0002] Electro-galvanizing is a commonly used method for metal anti-corrosion, and it is widely used in all aspects of life. Moreover, the electroplating technology has simple equipment, easy operation and low cost. However, the corrosion potential of zinc is negative than that of iron, and it has good corrosion resistance in dry air. When the plated parts come into contact with corrosive media, they will react with zinc first, thus protecting the substrate. However, due to the active nature of zinc, it is easily corroded under hot and humid environmental conditions. If the galvanized workpiece is not post-treated, the coating will quickly darken and produce white corrosion products, which will greatly weaken the anti-corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C25D5/48
CPCC23C22/44C25D5/48
Inventor 范云鹰贺本龙
Owner KUNMING UNIV OF SCI & TECH
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