Passivating agent for hot-dip galvanized steel plate and preparation method

A technology of hot-dip galvanized steel sheet and passivating agent, applied in the coating process of metal materials, etc., can solve the problems of large consumption, low passivation efficiency, passivation film density and hardness not up to standard, etc., and achieve passivation efficiency High, smooth surface, good dispersion uniformity effect

Inactive Publication Date: 2018-10-23
天津市迪斯科通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the trivalent chromium passivation agent in the prior art has defects such as large consumption, low passivation efficiency, and the density and hardness of the obtained passivation film are not up to standard due to the limitations of the formula and process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A passivating agent for hot-dip galvanized steel sheets proposed by the present invention comprises the following raw materials in parts by weight: 28 parts of trivalent chromium compounds, 15 parts of sodium hypophosphite, 10 parts of sodium sulfate, 8 parts of sodium fluorosilicate, cobalt chloride 18 parts, 10 parts of boric acid, 22 parts of organic carboxylic acid, 1 part of sodium dodecylbenzenesulfonate, 12 parts of glycerol, 40 parts of deionized water, wherein the mass ratio of the trivalent complex is 1.2:2 : 0.8 mixture of chromium chloride, chromium nitrate and potassium dichromate; organic carboxylic acid is a mixture of oxalic acid, 2-methylsuccinic acid and sebacic anhydride with a mass ratio of 3:1.2:1.

[0020] Its preparation method comprises the following steps:

[0021] S1. Add the trivalent chromium compound of the specific gravity, sodium hypophosphite, sodium nitrate and cobalt chloride into deionized water, stir and mix for 30 minutes at 85°C, an...

Embodiment 2

[0026] A passivator for hot-dip galvanized steel sheets proposed by the present invention comprises the following raw materials in parts by weight: 45 parts of trivalent chromium compound, 22 parts of sodium hypophosphite, 16 parts of sodium sulfate, 10 parts of sodium fluorosilicate, cobalt chloride 25 parts, 14 parts of boric acid, 28 parts of organic carboxylic acid, 3 parts of sodium dodecylbenzenesulfonate, 20 parts of glycerol, 55 parts of deionized water, wherein the mass ratio of the trivalent complex is 1.6:2.8 : 1 mixture of chromium chloride, chromium nitrate and potassium dichromate; the organic carboxylic acid is a mixture of oxalic acid, 2-methylsuccinic acid and sebacic anhydride in a mass ratio of 4:1.5:1.

[0027] Its preparation method comprises the following steps:

[0028] S1. Add the trivalent chromium compound of the specific gravity, sodium hypophosphite, sodium nitrate and cobalt chloride into deionized water, stir and mix for 20 minutes at 105°C, and d...

Embodiment 3

[0033] A passivator for hot-dip galvanized steel sheets proposed by the present invention comprises the following raw materials in parts by weight: 32 parts of trivalent chromium compound, 18 parts of sodium hypophosphite, 12 parts of sodium sulfate, 9 parts of sodium fluorosilicate, cobalt chloride 22 parts, 12 parts of boric acid, 25 parts of organic carboxylic acid, 2 parts of sodium dodecylbenzenesulfonate, 15 parts of glycerol, 48 parts of deionized water, wherein the mass ratio of the trivalent complex is 1.4:2.2 : 1 mixture of chromium chloride, chromium nitrate and potassium dichromate; the organic carboxylic acid is a mixture of oxalic acid, 2-methylsuccinic acid and sebacic anhydride in a mass ratio of 4:1.4:1.

[0034] Its preparation method comprises the following steps:

[0035] S1. Add the trivalent chromium compound of the specific gravity, sodium hypophosphite, sodium nitrate and cobalt chloride into deionized water, stir and mix for 25 minutes at 95°C, and dis...

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PUM

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Abstract

The invention discloses a passivating agent for a hot-dip galvanized steel plate. The passivating agent for the hot-dip galvanized steel plate comprises, by weight, 25-48 parts of trivalent chromium compounds, 12-24 parts of sodium hypophosphite, 8-18 parts of sodium sulfate, 6-10 parts of sodium fluorosilicate, 18-25 parts of cobalt chloride, 10-15 parts of boric acid, 20-30 parts of organic carboxylic acid, 1-3 parts of sodium dodecyl benzene sulfonate, 10-20 parts of glycerin and 40-60 parts of deionized water. The passivating agent for the hot-dip galvanized steel plate has good stabilityand good dispersion uniformity, and is used for achieving passivation of the hot-dip galvanized steel plate. A utilization method is high in passivating efficiency, an obtained passive film is high inbinding force, smooth in surface and good in compactness, the thickness of the passive film can range from 5mg / m2 to 12mg / m2, and the passive film is high in rigidity and wear resistance. A preparation method of the passivating agent is simple, green and environmentally friendly, accords with the ideas of safety and environmental protection in China, is free of the investment of large equipment,is low in preparation cost and suitable for industrial production, and is worth popularizing.

Description

technical field [0001] The invention relates to the technical field of metal passivators, in particular to a passivator for hot-dip galvanized steel sheets and a preparation method. Background technique [0002] As the most widely used metal material in daily production, steel has the defect of being easily corroded. This defect has brought great economic losses to manufacturers, and has also significantly reduced the performance and shortened the service life of steel buildings and products. its service life. With the rapid development of modern industry, galvanizing on the surface of steel and other metals to improve the corrosion resistance of steel and metal materials has received extensive attention. Hot-dip galvanized steel sheets have been widely used in different fields such as building materials, aviation, automobiles, and home appliances. They are one of the steel varieties with the fastest growth in output in recent years in my country. [0003] The traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47
CPCC23C22/47
Inventor 韩成喜
Owner 天津市迪斯科通科技有限公司
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