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Roller coating conversion treatment agent for color coated steel sheet

A color-coated steel sheet and conversion treatment technology, which is applied in the direction of metal material coating technology, can solve the problems of poor corrosion resistance and high production cost, and achieve the advantages of convenient use, production cost control, excellent corrosion resistance and adhesion Effect

Inactive Publication Date: 2016-06-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based surface treatment agent does not contain chromium in any valence state. It is an environmentally friendly surface treatment agent. However, due to the addition of nanoparticles and water-based resins to the components, the production cost is greatly increased, and the corrosion resistance is also low. Chromium-containing passivators

Method used

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  • Roller coating conversion treatment agent for color coated steel sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] Preparation of conversion treatment agent:

[0027] First, aldehyde organic matter is dissolved in part of deionized water to make an aldehyde organic matter solution for subsequent use; then the chromate and phosphoric acid are dissolved in part of deionized water to make a solution containing chromate and phosphoric acid, and then the solution containing chromic acid Heat the solution of salt and phosphoric acid to 75-85°C, slowly add the aldehyde organic solution while stirring; then heat it to 90±2°C and keep it for 120-130min, then stop heating, naturally cool to 50±2°C, and add it while stirring Phytic acid and polyethylene glycol polymer with a molecular weight of 10,000-60,000, then add the balance of deionized water according to the ratio of solute to deionized water weight ratio of 1:9-12, stir for 15-20 minutes, and cool to room temperature to obtain Conversion treatment agent 1-5. 1-5 conversion treatment agent does not contain Cr 6+ . Components and propo...

Embodiment 1

[0030] Example 1: When the machine speed is 90m / min and the roller coating pressure is 200kg, the conversion treatment agent 1 is evenly coated on the surface of the steel strip, and then dried. The drying temperature is 85°C, and the drying time is 15 seconds, the thickness of the converted layer is 1.5 μm, and the surface of the converted layer has no rust. Neutral salt spray test for 168 hours, no rust on the surface of the conversion layer. After the coating is applied, the coating adhesion is excellent: the T-bend value is 1T, the cupping value is 8.0mm, and the reverse impact energy is 10J.

Embodiment 2

[0031] Example 2: When the machine speed is 120m / min and the roller coating pressure is 250kg, the conversion treatment agent 2 is evenly coated on the surface of the steel strip, and then dried. The drying temperature is 90°C, and the drying time is 9 seconds, the thickness of the conversion layer is 1.8 μm, and the neutral salt spray test lasts 192 hours, and the conversion layer surface has no rust. After the coating is applied, the coating adhesion is excellent: the T-bend value is 2T, the cupping value is 7.5mm, and the reverse impact energy is 9J.

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Abstract

The invention discloses a roll coating conversion treatment agent for color coated steel plates, which solves the problems of poor corrosion resistance, high production cost and long conversion treatment time in the existing roll coating conversion treatment agent. The technical scheme includes using the following components by weight percentage as the solute: 30-60% of chromate, 10-50% of phosphoric acid, 10-25% of organic aldehydes, 3-10% of polyethylene glycol polymer, 0.5-5% of phytic acid 1.5%, the total of the above components is 100%; the mixing weight ratio of the solute to the solvent is 1:9-12, and the solvent is deionized water. The invention has good stability, low production cost, good corrosion resistance, excellent performance and short conversion time, and is suitable for rapid conversion treatment of large-scale color coated steel plate production lines.

Description

technical field [0001] The invention relates to a conversion treatment agent for steel plates, in particular to a roll coating conversion treatment agent for color coated steel plates. Background technique [0002] After the strip is cleaned, different conversion treatments are carried out according to the type of steel base. Three methods are often used for conversion treatment: immersion method, spray method, and roller coating method. The roller coating method is to use a roller coating device to apply the conversion treatment solution on the surface of the strip, and dry it directly after coating without washing with water, so it is also called "no rinsing method" or "in-situ drying method". This method has stable ingredients, good coating quality, less pollution, and can save water and solvents. It has been gradually adopted by more manufacturers. The purpose of conversion treatment is to improve the adhesion and corrosion resistance of color-coated steel sheets. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/33
Inventor 涂元强白会平蔡捷宋乙峰黄道兵杜蓉杨宏武雷泽红
Owner 武汉钢铁有限公司
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