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Non-corrosive steel pickle acid catalyst and process for preparing the same

A technology for pickling liquid and catalyst, applied in the field of stainless steel pickling liquid catalyst and its preparation, can solve the problems of affecting the quality of stainless steel surface pickling, endangering the health of operators, equipment corrosion, etc., so as to avoid over-corrosion phenomenon and improve utilization rate, the effect of accelerated removal

Inactive Publication Date: 2007-05-30
北京长航伟业环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of acid mist will be generated during the above pickling process, which will seriously pollute the environment and endanger the health of the operator, and the corrosion of various equipment is also quite serious. A little carelessness in the operation process will also cause excessive corrosion on the surface of the stainless steel. The surface of the workpiece is rough, which seriously affects the quality of pickling on the stainless steel surface

Method used

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  • Non-corrosive steel pickle acid catalyst and process for preparing the same
  • Non-corrosive steel pickle acid catalyst and process for preparing the same

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Experimental program
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Effect test

Embodiment 1

[0012] The stainless steel pickling solution catalyst of the present invention is composed of the following raw materials (the following percentages are percentages by weight): 80‰ of fatty alcohol polyoxyethylene ether, 60‰ of alkyl alcohol amide phosphoric acid ester, 10‰ of sodium benzoate, and ethylenediaminetetraacetic acid Disodium 2‰, the rest is water.

[0013] After mixing the above raw materials, heat to 50°C and stir evenly.

Embodiment 2

[0015] The stainless steel pickling solution catalyst of the present invention is composed of the following raw materials (the following percentages are percentages by weight): 220‰ of fatty alcohol polyoxyethylene ether, 180‰ of alkyl alcohol amide phosphoric acid ester, 60‰ of sodium benzoate, and ethylenediaminetetraacetic acid Disodium 30‰, the rest is water.

[0016] After mixing the above raw materials, heat to 65°C and stir evenly.

Embodiment 3

[0018] The stainless steel pickling solution catalyst of the present invention is composed of the following raw materials (the following percentages are percentages by weight): 180‰ of fatty alcohol polyoxyethylene ether, 120‰ of alkyl alcohol amide phosphoric acid ester, 40‰ of sodium benzoate, and ethylenediaminetetraacetic acid Disodium 15‰, the rest is water.

[0019] After mixing the above raw materials, heat to 80°C and stir evenly.

[0020] The above-mentioned fatty alcohol polyoxyethylene ether can be replaced by alkylphenol polyoxyethylene ether, such as nonylphenol polyoxyethylene ether.

[0021] The chemical formula of fatty alcohol polyoxyethylene ether is:

[0022] R-O-(CH 2 CH 2 O) 7 h

[0023] Fatty alcohol polyoxyethylene ether can be a common surfactant, such as lauryl alcohol polyoxyethylene ether and tridecyl alcohol polyoxyethylene ether.

[0024] The structural formula of alkylolamide phosphate is:

[0025]

[0026] The above-mentioned alkylolami...

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Abstract

It relates to nitrate hydrofluoric acid for washing stainless steel surface oxide skins. It aims to solve the acid mist generated in the process of acid pickling stainless oxidization layer through nitrate or hydrogen fluoride, made of aliphatic alcohol polyvinyl ether 80-220%., alkylamino carboxylate surfactant 60-180%., sodium benzoate 10-60%., complexon 2-30%. and water for the rest with their percentage by weight. Heating the mixture of material to the temperature 50-80 DEG C and blend evenly. It can prohibit acid mist in acid pickling, speeding up the elimination of metal oxidization layer, avoiding corrosion to the metal, reducing acid consumption with improved acid application efficiency.

Description

technical field [0001] The invention relates to a nitric acid hydrofluoric acid pickling solution, in particular to a stainless steel pickling solution catalyst added in the nitric acid hydrofluoric acid pickling solution for pickling stainless steel surface oxide scales and a preparation method thereof. Background technique [0002] The existing method for removing scale on the surface of stainless steel is generally pickling with industrial nitric acid and hydrofluoric acid. However, a large amount of acid mist will be produced in the above pickling process, which will seriously pollute the environment and endanger the health of the operator, and the corrosion of various equipment is also quite serious. A little carelessness in the operation process will also cause excessive corrosion on the stainless steel surface. The surface roughness of the workpiece is caused, which seriously affects the quality of pickling of the stainless steel surface. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C23G1/06
Inventor 李毅
Owner 北京长航伟业环保科技有限公司
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