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Passivating solution and surface treatment method for galvanized material

A technology of passivation solution and aqueous solution, which is applied in the coating process of metal materials, etc., can solve the problems of poor corrosion resistance and achieve the effect of excellent corrosion resistance

Inactive Publication Date: 2009-12-23
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a passivation solution that can be used to improve the corrosion resistance of galvanized materials in order to overcome the disadvantages of poor corrosion resistance in existing galvanized materials

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0024] The passivation solution provided by the present invention can be prepared by conventional preparation methods, for example, mixing water-soluble molybdenum compound, boric acid, alcohol, organic carboxylic acid, silica sol and water. The mixing temperature and mixing time are not particularly limited, as long as the various components are mixed evenly to form a uniform solution, and the mixing temperature can be 20-80°C. Preferably, the preparation method of the passivation solution includes: adding boric acid to a part of water, raising the temperature of the solution to 60-80°C after the boric acid is completely dissolved, then adding the molybdenum compound and the mixture of alcohol and organic carboxylic acid, and waiting for the solution to become After cooling to 20-35°C after turning green, transparent and clear, add silica sol, stir for 2-10 minutes (stirring speed can be 10-200 rpm), and then add the rest of the water.

[0025] The surface treatment method of...

Embodiment 1

[0033] This embodiment is used to illustrate the surface treatment method of the passivation solution and the galvanized material provided by the present invention.

[0034] 1 gram of boric acid was added to 500 ml of deionized water, and after the dissolution of the boric acid was completed, the temperature of the solution was raised to 65°C. Add 3 grams of ammonium tetramolybdate thereto, and then add 2 grams of a mixture of methanol and succinic acid (the weight ratio of methanol and succinic acid is 1:1). After the liquid turned into a green transparent clear solution, the solution was naturally cooled to room temperature, then 20 grams of silica sol (the concentration of silicon dioxide was 40% by weight) was added, stirred at 50 rpm for 3 minutes, and then deionized water was added , to obtain 1 liter of passivation solution A1.

[0035] Spray the passivation solution A1 prepared above on the surface of the galvanized steel coil (model DX51D+AZ) (the amount of passivati...

Embodiment 2

[0037] This embodiment is used to illustrate the surface treatment method of the passivation solution and the galvanized material provided by the present invention.

[0038] 2 g of boric acid was added to 700 ml of deionized water, and after the dissolution of boric acid was completed, the temperature of the solution was raised to 70°C. 5 grams of dimolybdic acid was added thereto, and then a mixture of 3 grams of methanol and maleic acid was added (the weight ratio of methanol and maleic acid was 1:1.5). After the liquid turned into a green, transparent and clear solution, the solution was naturally cooled to room temperature, then 10 grams of silica sol (the concentration of silicon dioxide was 40% by weight) was added, stirred at 100 rpm for 5 minutes, and then deionized water was added , to obtain 1 liter of passivation solution A2.

[0039] Spray the passivation solution A2 prepared above on the surface of the galvanized steel coil (model DX51D+AZ) (the amount of passiva...

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PUM

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Abstract

The invention relates to a passivating solution which is aqueous solution containing water-soluble molybdic compound, boric acid, water-soluble organic matter and silica sol, wherein the water-soluble organic matter is a mixture of alcohol and organic carboxylic acid. The invention also provides a surface treatment method for a galvanized material, which comprises the following step: enabling the passivating solution to be in contact with a galvanized material. A galvanized layer can be passivated by the contact between the passivating solution and the galvanized material so as to enable the galvanized material to have excellent corrosion resistance. In addition, the paint composition is chromium free and meets the requirements of a RoHS instruction.

Description

technical field [0001] The invention relates to a passivation solution and a surface treatment method for galvanized materials. Background technique [0002] One of the main uses of galvanized materials such as galvanized steel sheets or steel coils is in the electrical manufacturing industry, such as air conditioners and computer cases. Galvanized materials are generally passivated prior to storage, transport or use. Passivation treatment generally includes contacting the passivation solution with the galvanized material, such as spraying the passivation solution onto the surface of the galvanized material. The passivation solution includes a passivation solution containing hexavalent chromium and a passivation solution without hexavalent chromium. liquid. [0003] On February 13, 2003, the European Parliament and the Council passed the "Directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment", referred to as the RoHS...

Claims

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Application Information

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IPC IPC(8): C23C22/40
CPCC23C22/40
Inventor 田冰张勇刚马建权邹永金郭太雄许哲峰张爱萍李国安
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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