Cleaning agent for rust-proof cold-rolled steel sheets before annealing

A technology of cold-rolled steel sheet and cleaning agent, which is applied in the field of rust-proof cold-rolled steel sheet cleaning agent before annealing, can solve the problem of easy rusting of cold-rolled steel strip, and achieve excellent rust resistance, good cleaning performance and good cleaning effect. Effect

Inactive Publication Date: 2013-09-18
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

[0004] The purpose of the present invention is to overcome the defect that the cold-rolled steel strip is prone to rust before annealing, and t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 30% sodium hydroxide, 30% sodium carbonate, 20% trisodium phosphate, 10% sodium benzoate, 2% edetate disodium, and 8% tetradecyl polyoxyethylene ether by weight percentage. Raw materials are evenly mixed to prepare cleaning agent 1 for anti-rust cold-rolled steel plate before annealing.

[0022] Add anti-rust cold-rolled steel plate cleaning agent 1 before annealing directly to the water in the cleaning section before recrystallization annealing of cold-rolled strip steel, so that the weight percentage concentration is 3%, and clean the strip to be annealed under the condition that the pickling temperature is 85°C. The steel surface, after testing, has a cleaning efficiency of 99.3%, and the anti-rust period of the steel plate in the intermediate process reaches 16 days.

Embodiment 2

[0024] Take 40% sodium hydroxide by weight percentage, 20% sodium carbonate, 10% trisodium phosphate, 20% sodium benzoate, 7% disodium edetate, 3% n-tetradecyl polyoxyethylene ether, the above Raw materials are uniformly mixed to prepare anti-rust cold-rolled steel plate cleaning agent 2 before annealing.

[0025] Add anti-rust cold-rolled steel plate cleaning agent 2 before annealing directly to the water in the cleaning section before the recrystallization annealing of cold-rolled strip steel, so that the weight percentage concentration is 5%, and clean the strip to be annealed under the condition that the pickling temperature is 70 ° C. The steel surface, after testing, has a cleaning efficiency of 99.1%, and the anti-rust period of the steel plate in the intermediate process reaches 17 days.

Embodiment 3

[0027] Get sodium hydroxide 35%, sodium carbonate 25%, trisodium phosphate 15%, sodium benzoate 15%, edetate disodium 4%, n-tetradecyl polyoxyethylene ether 6% by weight percentage, the above-mentioned Raw materials are uniformly mixed to prepare anti-rust cold-rolled steel plate cleaning agent 3 before annealing.

[0028] Add anti-rust cold-rolled steel plate cleaning agent 3 before annealing directly to the water in the cleaning section before recrystallization annealing of cold-rolled strip steel, so that the weight percent concentration is 4%, and clean the strip to be annealed under the condition that the pickling temperature is 75°C. The steel surface, after testing, has a cleaning efficiency of 99.2%, and the anti-rust period of the steel plate in the intermediate process reaches 15 days.

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Abstract

The invention discloses a cleaning agent for rust-proof cold-rolled steel sheets before annealing. The cleaning agent comprises the following components by weight percent: 30-40% of sodium hydroxide, 20-30% of sodium carbonate, 10-20% of trisodium phosphate, 10-20% of sodium benzoate, 2-7% of ethylene diamine tetraacetic acid and 3-8% of n-tetradecyl polyoxyethylene ether. When the cleaning agent is used, the cleaning agent is added to water according to a weight percent of 3-5% to prepare cleaning solution and the cold-rolled steel sheets before annealing are cleaned in the cleaning solution at 70-85 DEG C. The cleaning agent has the beneficial effects that the cleaning agent does not have strong pungent smell, can be directly added to cleaning section water before recrystallization annealing of the cold-rolled steel sheets, is convenient and easy to use, has good cleaning effects, has high cleaning efficiency being above 99%, has excellent rust-proof property, is suitable for cleaning the cold-rolled steel sheets, alloying galvanized sheets, hot galvanized sheets and the like and enables the rust-proof period of the steel sheets in the middle process to be over 15 days.

Description

technical field [0001] The invention relates to a cleaning agent for the surface of cold-rolled steel strips before annealing, in particular to a cleaning agent for rust-proof cold-rolled steel sheets before annealing. Background technique [0002] Cleaning is an important step before recrystallization annealing. Before recrystallization annealing, the surface cleaning process must be carried out to remove oil particles and other surface residues on the metal surface. Before recrystallization annealing, the metal surface is not clean, and pollutants will be brought into the annealing process, which will affect the surface quality of the strip steel after annealing. Therefore, how to improve cleaning ability and reduce production cost is a common concern before annealing. [0003] The degreasing and cleaning process of cold-rolled strip steel before recrystallization annealing is a very important process in the strip steel production process. This process largely determines ...

Claims

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Application Information

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IPC IPC(8): C23G1/19
Inventor 黄先球李立军张万灵刘建容马颖郎丰军程鹏石争鸣何锐
Owner 武汉钢铁有限公司
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