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Heat-resistant coating solution for hot-dip galvanized sheet and its preparation and use method

A technology of hot-dip galvanized sheet and heat-resistant coating, applied in the direction of metal material coating process, etc., can solve the problems of unenvironmental corrosion resistance, poor heat resistance, carcinogenicity, etc., and achieve good environmental protection, high heat resistance, The effect of reducing production costs

Active Publication Date: 2019-03-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the traditional hot-dip galvanized coating solution is carcinogenic, not environmentally friendly, and the existing hot-dip galvanized passivation film has poor corrosion resistance and poor heat resistance.

Method used

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  • Heat-resistant coating solution for hot-dip galvanized sheet and its preparation and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of hot-dip galvanized sheet heat-resistant coating solution by technical method of the present invention

[0037] Preparation of Trivalent Chromium Mixture:

[0038] The trivalent chromium mixture is formed by the reaction of water, chromium trioxide, salicylic acid, and hydrofluoric acid, and its ratio (based on the amount of substance) is: water 100, chromium trioxide 2, salicylic acid 1, hydrofluoric acid 8 . The preparation method is as follows: first, add chromium trioxide into water, dissolve and stir evenly, then add salicylic acid, after it is completely dissolved, add hydrofluoric acid, and keep stirring, and the reaction time is 5 hours.

[0039] Preparation of hot-dip galvanized sheet coating solution:

[0040] The preparation content (in parts by weight) of the hot-dip galvanized sheet coating liquid is: 100 parts of water, 30 parts of trivalent chromium mixture, 6 parts of manganese dihydrogen phosphate, 4 parts of sodium tungstate, ...

Embodiment 2

[0041] Example 2 Preparation of hot-dip galvanized sheet heat-resistant coating solution by technical method of the present invention

[0042] Preparation of Trivalent Chromium Mixture:

[0043] The trivalent chromium mixture is formed by the reaction of water, sodium dichromate, citric acid and phosphoric acid, and its ratio (in terms of the amount of substances) is: water 100, sodium dichromate 2, citric acid 3, phosphoric acid 9. The preparation method is as follows: first, add sodium dichromate into water, dissolve and stir evenly, then add citric acid, after it is completely dissolved, add phosphoric acid, and keep stirring, and the reaction time is 3 hours.

[0044] Preparation of heat-resistant coating solution for hot-dip galvanized sheet:

[0045] The preparation content (in parts by weight) of the hot-dip galvanized sheet coating liquid is: 100 parts of water, 20 parts of trivalent chromium mixture, 3 parts of fluorotitanic acid, 5 parts of ammonium metavanadate, an...

Embodiment 3

[0046] Example 3 Preparation of hot-dip galvanized sheet heat-resistant coating solution by technical method of the present invention

[0047] Preparation of Trivalent Chromium Mixture:

[0048] The trivalent chromium mixture is formed by the reaction of water, ammonium dichromate, oxalic acid, and sodium dihydrogen phosphate, and its ratio (in terms of the amount of substance) is: water 100, ammonium dichromate 1.5, oxalic acid 4, sodium dihydrogen phosphate 15 . The preparation method is as follows: firstly add ammonium dichromate into water, dissolve and stir evenly, then add oxalic acid, after complete dissolution, add sodium dihydrogen phosphate, and keep stirring, the reaction time is 6h.

[0049] Preparation of heat-resistant coating solution for hot-dip galvanized sheet:

[0050] The preparation content (in parts by weight) of the hot-dip galvanized sheet coating liquid is: 100 parts of water, 40 parts of trivalent chromium mixture, 3 parts of sulfuric acid, 6 parts ...

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Abstract

The invention belongs to the field of hot galvanized steel plates, and particularly relates to heat resistant coating liquid for a hot galvanized plate and a preparation method and a using method of the heat resistant coating liquid. The heat resistant coating liquid for the hot galvanized plate is provided for solving the problems that coating liquid for a hot galvanized plate in the prior art is poor in heat resistance, not stable under high temperature and the like. Components of the heat resistant coating liquid for the hot galvanized plate comprise that, by weight, 10-60 parts of a trivalent chromium mixture, 2-15 parts of an acidic regulating agent, 1-10 parts of a film forming promoting agent and 5-20 parts of colloidal silicon dioxide are added into every 100 parts of water. The coating liquid does not contain hexavalent chromium, cannot cause harm to human bodies and is good in environmental protection performance; and a hot galvanized coating plate prepared after coating on the surface of the hot galvanized plate has high corrosion resistance and further has good fingerprint resistance, water resistance and adhesiveness. The coating liquid does not contain organic matter, is high in high temperature resistance and can meet the spraying requirement of a product high in heat resistance requirement.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanized steel sheets, and in particular relates to a heat-resistant coating liquid for hot-dip galvanized sheets and methods for preparing and using the same. Background technique [0002] Due to its excellent processing and use properties, hot-dip galvanized steel sheets have been widely used in industrial fields such as household appliances, automobiles, and construction. However, in a humid environment, hot-dip galvanized sheets are easily corroded, so coatings are generally used to passivate the steel sheets. The traditional chromate passivation treatment has simple process, good film bonding force, high corrosion resistance and self-healing ability. Commonly used chromate is generally hexavalent chromium, which is a carcinogen and has serious harm to the human body and the environment. Therefore, products containing hexavalent chromium are strictly restricted. [0003] For this reason, a lot of ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/47C23C22/46C23C22/44C23C22/42C23C22/40C23C22/36C23C22/34C23C22/53
CPCC23C22/34C23C22/36C23C22/367C23C22/40C23C22/42C23C22/44C23C22/46C23C22/47C23C22/53
Inventor 董学强郭太雄徐权
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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