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Degreasing agent for avoiding bonding of cold rolled sheet steel in cover annealing and using method of degreasing agent

A technology of degreasing agent and bell furnace, which is applied in the direction of furnace, furnace type, heat treatment furnace, etc., to achieve the effect of improving degreasing effect and high degreasing speed

Inactive Publication Date: 2012-09-26
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no degreasing agent for cold-rolled steel sheets in the prior art that can well meet the above requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Degreasing agent formula (weight%): Sodium hydroxide (NaOH): 20%; Sodium orthosilicate (NaOH) 4 SiO 4 ): 70%; sodium carbonate (Na 2 CO 3 ) 3%; trisodium phosphate (Na 3 PO 4 :): 6%; non-ionic surfactant (fatty alcohol polyoxyethylene ether): 0.5%; defoamer (tributyl phosphate): 0.5%;

[0019] Dissolve the well-mixed degreasing agent in a proportion of 5% (weight) with deionized water in a mixing tank; stir well and pour it into a degreasing tank for degreasing;

[0020] Working temperature of degreasing agent solution: 95°C; current density during electrolytic degreasing: 15A / dm 2 . Unit degreasing speed: 300-400m / min or even higher.

[0021] Degreasing effect: Wipe the surface of the degreased steel plate with white filter paper. There is no oil stain on the surface of the white filter paper, indicating that the oil stain on the surface of the strip steel has been cleaned. Use the fluorescent X-ray method to measure the SiO on the surface of the steel plate 2 ...

Embodiment 2

[0023] Degreasing agent formula (weight%): Sodium hydroxide (NaOH): 24%; Sodium orthosilicate (NaOH) 4 SiO 4 ): 64%; sodium carbonate (Na 2 CO 3 ) 4%; trisodium phosphate (Na 3 PO 4 :): 7%; non-ionic surfactant (fatty alcohol polyoxyethylene ether): 0.6%; defoamer (tributyl phosphate): 0.4%;

[0024] Dissolve the well-mixed degreasing agent in a proportion of 7% (weight) with deionized water in a mixing tank; stir well and inject it into a degreasing tank for degreasing;

[0025] Working temperature of degreasing agent solution: 85°C; current density during electrolytic degreasing: 11A / dm 2 . Unit degreasing speed: 300-400m / min or even higher.

[0026] Wipe the surface of the steel plate after degreasing with white filter paper. There is no oil stain on the surface of the white filter paper, indicating that the oil stain on the surface of the strip steel has been cleaned. Use the fluorescent X-ray method to measure the SiO on the surface of the steel plate. 2 The amoun...

Embodiment 3

[0028] Degreasing agent formula (weight%): Sodium hydroxide (NaOH): 22%; Sodium orthosilicate (NaOH) 4 SiO 4 ): 67%; sodium carbonate (Na 2 CO 3 ) 5%; trisodium phosphate (Na 3 PO 4 :): 5%; non-ionic surfactant (fatty alcohol polyoxyethylene ether): 0.7%; defoamer (tributyl phosphate): 0.3%;

[0029] Dissolve the well-mixed degreaser in deionized water at a ratio of 8% (weight); and stir well;

[0030] Working temperature of degreasing agent solution: 90°C; current density during electrolytic degreasing: 14A / dm 2 . Unit degreasing speed: 300-400m / min or even higher.

[0031] Wipe the surface of the steel plate after degreasing with white filter paper. There is no oil stain on the surface of the white filter paper, indicating that the oil stain on the surface of the strip steel has been cleaned. Use the fluorescent X-ray method to measure the SiO on the surface of the steel plate. 2 The amount of film is 4mg / m 2, the degreased steel strip was put into a bell furnace an...

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PUM

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Abstract

The invention discloses a degreasing agent for avoiding bonding of cold rolled sheet steel in cover annealing and a using method of the degreasing agent. The degreasing agent comprises the following components in percentage by weight: 20% to 25% of sodium hydroxide, 64% to 70% of positive sodium silicate, 3% to 5% of sodium carbonate, 5% to 10% of trisodium phosphate, 0.3% to 1% of nonionic surfactant and 0.1% to 0.5% of defoaming agent. The degreasing agent disclosed by the invention can be used for thoroughly cleaning various greasy dirt adhered to the surface of the cold rolled sheet steel and reserving a silicate membrane with proper thickness on the surface of the sheet steel so as to effectively avoid the bonding of the sheet steel in the cover annealing; and the membrane has on influence on properties such as the binding force of a coating, the processing of a steel plate, and the like. In addition, when the degreasing agent disclosed by the invention is used, the steel plate does not need to be immersed in the degreasing agent in advance, the modern quick unit degreasing can be implemented, the speed reaches 300m / min to 400m / min or above, and the degreasing is efficient and quick, so that the greasing agent is completely suitable for a modern quick unit coil degreasing line.

Description

technical field [0001] The invention relates to a degreasing agent for annealing and bonding of an anti-cold-rolled thin steel plate in a bell furnace and a using method thereof. Background technique [0002] Cold-rolled tin plate, cold-rolled battery case steel plate and other cold-rolled thin steel plates are usually lubricated with an emulsion composed of various oils (such as natural oils, synthetic oils, etc.) and cooling. Therefore, this grease lubricant will remain on the surface of the strip after the steel plate is rolled. Before annealing the steel plate, this layer of oil must be removed by chemical degreasing and electrolytic degreasing to prevent this layer of oil from annealing. When carbonization occurs on the surface of the steel plate, carburization and carbonaceous stains will occur, which will affect the performance and quality of the steel plate during electroplating or other processing in the subsequent process. [0003] At present, there are continuous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/19C21D1/68C21D1/26C21D9/46
Inventor 柳长福涂元强白会平蔡捷宋乙峰
Owner 武钢集团有限公司
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