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Degreasing agent for cold-rolled continuous annealing unit

A technology of continuous withdrawal unit and degreasing agent, applied in the field of corrosion and protection, can solve the problems of demulsification and stratification, long degreasing time, precipitation, etc., and achieve the effect of low price and excellent cleaning performance

Inactive Publication Date: 2015-06-03
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 degreasing agent used in the existing cold rolling continuous annealing unit adopts the process of high-temperature spray cleaning, high-temperature electrolytic degreasing and high-temperature hot water washing. Demulsification, delamination, precipitation, etc. may also occur during storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 12% sodium hydroxide, 6% potassium hydroxide, 2.4% sodium carbonate, 1.8% sodium phosphate, 5% sodium gluconate, 1% ethylenediaminetetraacetic acid, 2% polyacrylic acid sodium salt, and nonylphenol by weight Polyoxyethylene ether 1%, H-11 active agent 1%, desalted water 67.8%. After these raw materials are uniformly mixed in the manner described, a concentrated solution is prepared. When in use, mix 3 parts by weight of concentrated solution and 97 parts by weight of water to obtain a working solution with a mass fraction of 3%. According to the standard method JB / T 4323.2-19999 test, the cleaning ability of this working solution is 98.2%. After degreasing The surface reflectance of the cold-rolled steel plate is 87.5%, and the residue on the surface of the steel plate is less than 10mg / m 2 . The degreasing agent for the cold rolling continuous annealing unit formulated according to the ratio of this example did not appear demulsification, delamination, precipita...

Embodiment 2

[0019] Take 15% sodium hydroxide, 5% potassium hydroxide, 3% sodium carbonate, 2% sodium phosphate, 5% sodium gluconate, 1% ethylenediaminetetraacetic acid, 1% polyacrylic acid sodium salt, and nonylphenol by weight. Polyoxyethylene ether 2%, H-11 active agent 1%, desalinated water 65%. After these raw materials are uniformly mixed in the manner described, a concentrated solution is prepared. When in use, mix 3 parts by weight of concentrated solution and 97 parts by weight of water to obtain a working solution with a mass fraction of 3%. According to the standard method JB / T 4323.2-19999 test, the cleaning ability of this working solution is 98.8%. After degreasing The surface reflectance of the cold-rolled steel plate is 89.2%, and the residue on the surface of the steel plate is less than 8mg / m 2 . The degreasing agent for the cold rolling continuous annealing unit formulated according to the ratio of this example did not appear demulsification, delamination, precipitatio...

Embodiment 3

[0021] Take 17% sodium hydroxide, 4% potassium hydroxide, 3.2% sodium carbonate, 2.6% sodium phosphate, 5% sodium gluconate, 1% ethylenediaminetetraacetic acid, 1% polyacrylic acid sodium salt, and nonylphenol by weight. Polyoxyethylene ether 2%, H-11 active agent 1%, desalted water 63.2%. After these raw materials are uniformly mixed in the manner described, a concentrated solution is prepared. When in use, mix 3 parts by weight of concentrated solution and 97 parts by weight of water to obtain a working solution with a mass fraction of 3%. According to the standard method JB / T 4323.2-19999 test, the cleaning ability of this working solution is 98.0%. After degreasing The surface reflectance of the cold-rolled steel plate is 90.7%, and the residue on the surface of the steel plate is less than 7mg / m 2 . The degreasing agent for the cold rolling continuous annealing unit formulated according to the ratio of this example did not appear demulsification, delamination, precipita...

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PUM

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Abstract

The invention discloses a degreasing agent for a cold-rolled continuous annealing unit. The degreasing agent is prepared from an alkaline matter, an auxiliary cleaning agent, a chelating agent, a surfactant and desalted water, wherein the alkaline matter is prepared from the following ingredients in percentage by weight: 12-36 percent of sodium hydroxide and 0-6 percent of potassium hydroxide; the auxiliary cleaning agent is prepared from the following ingredients in percentage by weight: 1-5 percent of sodium carbonate and 1-5 percent of trisodium phosphate; the chelating agent is prepared from the following ingredients in percentage by weight: 1-6 percent of sodium gluconate and 0.5-2 percent of ethylenediamine tetraacetic acid; the surfactant is prepared from the following ingredients in percentage by weight: 0.5-2 percent of polyacrylic acid sodium salt, 0.5-2 percent of nonylphenol polyoxyethylene ether and 0.5-2 percent of an H-11type anionic surfactant. The degreasing agent is good in cleaning performance and low in cost. According to the degreasing agent, the cleaning rate of the cleaned band steel can be more than 98 percent, the oil residue on surface is smaller than or equal to 10 mg / m<2>, and the residual quantity of iron is smaller than or equal to 10 mg / m<2>. The degreasing agent can well adapt to the requirement on the cleaning quality of boards during high-speed production of the cold-rolled continuous annealing unit.

Description

technical field [0001] The invention relates to a degreasing agent for a cold rolling continuous annealing unit, which belongs to the technical field of corrosion and protection. Background technique [0002] The cleaning section is an important part of the pre-treatment of continuous retreat. Before annealing, the cold-rolled steel strip must undergo a surface cleaning process. Its main function is to remove the emulsion oil, iron powder, dust and other sundries on the surface of the cold-rolled steel strip, and to keep the surface of the metal substrate in good cleanliness. The follow-up process lays a solid foundation for the production of high-quality cold-rolled products. Therefore, improving the degreasing and cleaning ability of this process and reducing production costs are common concerns in continuous production. [0003] In recent years, with the introduction of more advanced technology and equipment, the new continuous annealing units of iron and steel enterpri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/19
CPCC23G1/19
Inventor 庞涛马颖周克飞黄先球郎丰军程鹏李琛夏荣金胡厚森
Owner 武汉钢铁有限公司
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