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Preparation method of chromium-free passivated liquid and method for passivating electrogalvanizing or zinc alloy layer by same

A chrome-free passivation and electro-galvanizing technology, applied in the field of passivation solution, can solve the problems of short time and industrial application limitations.

Inactive Publication Date: 2011-01-12
WUHAN JINZE NEW TIMES TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although these two chromium-free passivation solutions can better eliminate the pollution caused by Cr6+ ions, after these two passivation solutions passivate the electroplated zinc and zinc alloy layers, the time for white rust to appear in the salt spray test is relatively short , industrial applications are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A passivation solution, consisting of a passivation solution and a sealing agent, the passivation solution includes the following components and ratios in parts by weight: silica sol 10g / L, potassium titanium oxalate 3g / L, potassium fluorotitanate 1.5g / L , 3 mL / L of nitric acid with a mass concentration of 67%, and the rest is water; the sealing agent is composed of 7% silica sol and 20% silane coupling agent.

[0021] The preparation method of above-mentioned passivation solution is: (1) passivation solution: configuration contains silicon sol 10g / L, titanate 3g / L, fluorotitanate 1.5g / L, mass concentration is the nitric acid 3mL / L of 67% (2) blocking agent: hydrolyze 20% silane coupling agent, and then add 7% silica sol to adjust the pH to 8.5.

[0022] Use the above-mentioned passivation solution to passivate the electro-galvanized and zinc alloy layer, the method is: (1) immerse the workpiece of the electro-galvanized or zinc alloy layer in the chromium-free passivat...

Embodiment 2

[0025] A passivation solution is made up of a passivation solution and a sealing agent. The passivation solution includes the following components and weight / number ratios: 20 g / L of silica sol, 5 g / L of potassium titanium oxalate, and 0.5 g / L of potassium fluorotitanate , 2 mL / L of nitric acid with a mass concentration of 67%, and the rest is water; the sealing agent is composed of 5% silica sol and 30% silane coupling agent.

[0026] The preparation method of above-mentioned passivation solution is: (1) passivation solution: configure silicon-containing sol 20g / L, potassium titanium oxalate 5g / L, potassium fluotitanate 0.5g / L, mass concentration be 67% nitric acid 2mL / L (2) blocking agent: hydrolyze 30% silane coupling agent, and then add 5% silica sol to adjust the pH to 8.5.

[0027] Use the above-mentioned passivation solution to passivate electro-galvanized and zinc alloy layers, the method is: (1) immerse the workpiece of electro-galvanized or zinc alloy layer in the ch...

Embodiment 3

[0030] A passivation solution is made up of a passivation solution and a sealing agent. The passivation solution includes the following components and weight / number ratios: 5 g / L of silica sol, 1 g / L of potassium titanium oxalate, and 3.5 g / L of potassium fluorotitanate , 5 mL / L of nitric acid with a mass concentration of 67%, and the rest is water; the sealing agent is composed of 3% silica sol and 6% silane coupling agent.

[0031] The preparation method of above-mentioned passivation solution is: (1) passivation solution: configure silicon-containing sol 5g / L, potassium titanium oxalate 1g / L, potassium fluotitanate 3.5g / L, mass concentration be 67% nitric acid 5mL / L (2) blocking agent: hydrolyze 6% silane coupling agent, and then add 3% silica sol to adjust the pH to 8.5.

[0032] Use the above-mentioned passivation solution to passivate the electro-galvanized and zinc alloy layer, the method is: (1) immerse the workpiece of the electro-galvanized or zinc alloy layer in the c...

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Abstract

The invention provides a preparation method of chromium-free passivated liquid and a method for passivating an electrogalvanizing or a zinc alloy layer by the chromium-free passivated liquid, wherein, the chromium-free passivated liquid is composed of passivated liquid and a sealing agent. The preparation method of the passivated liquid is characterized by comprising the following steps: adding nitric acid, potassium fluotitanate and titanium salt to water respectively according to the mass concentration range of 1-5g / L of titanate, 0.5-3.5g / L of fluotitanate and 2-5mL / L of nitric acid (mass concentration of nitric acid is 65-68%), stirring and dissolving to obtain solution, adding 5-20g / L (based on mass content) of silicon sol to the solution, evenly stirring, and adjusting pH to 2.0 with sodium hydroxide. The preparation method of the sealing agent comprises the following steps: hydrolyzing 5-30% of silane coupling agent, then adding 1.5-10% (based on mass content) of silicon sol, and finally adjusting pH to 8-9.

Description

technical field [0001] The invention relates to a passivation solution for passivating electroplating zinc and zinc alloy layers, a preparation method of the chromium-free passivation solution and a passivation method for electroplating zinc and zinc alloy layers. Background technique [0002] Zinc and zinc alloys are easily corroded in hot and humid environments, and white spots and gray matter are formed on the surface. In order to improve the corrosion resistance and decorative properties of the galvanized layer, passivation treatment is required. The traditional method is to use chromate passivation solution for the passivation of the electro-galvanized layer. The passivation method is simple and low in cost, which greatly improves the corrosion resistance of the galvanized layer of steel parts. The chromate passivation process makes the galvanized layer form a mixed oxide film of chromium and zinc on the surface, and the chromium ions in the film are mainly Cr 3+ and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60C25D5/48C23C28/00
Inventor 董炽
Owner WUHAN JINZE NEW TIMES TECH
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