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Stainless steel pickling passivation paste and preparation method and use method thereof

A technology of pickling passivation and stainless steel, applied in the coating process of metal materials, etc., can solve the problems of secondary pollution, hydrogen fluoride pollution, etc., and achieve the effect of ensuring health and environmental hazards

Inactive Publication Date: 2017-10-20
NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a stainless steel pickling passivation paste and its preparation method and use method. The stainless steel pickling passivation paste is safe, environmentally friendly, efficient and stable, and no hydrogen fluoride is released during the operation, which reduces the harm to the human body and solves the problem of stainless steel pickling passivation. The long-standing hydrogen fluoride pollution and secondary pollution problems in the pickling passivation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A stainless steel pickling passivation paste, including 10kg of fluorosilicic acid, 14kg of nitric acid, 14kg of polyethyleneimine, 14kg of magnesium nitrate, 14kg of bentonite, 3kg of sodium polyphosphate, and 31kg of water; it also includes 3kg of crosslinking agent epoxy Chloropropane.

[0022] A production method of stainless steel pickling passivation paste, comprising the following steps:

[0023] Add other weighed raw materials except bentonite into the polytetrafluoroethylene reaction kettle. After stirring for 5 minutes, continue to add weighed bentonite and 3kg of cross-linking agent. After continuing to stir for 50 minutes, a jelly-like stainless steel pickling passivation is obtained. paste. The prepared pickling passivation paste can be filled.

[0024] As a corrosive agent, fluosilicic acid does not release hydrogen fluoride during use, avoiding harm to construction personnel, and can effectively solve the problem of failure during product placement. Be...

Embodiment 2

[0031] A stainless steel pickling passivation paste, including 12kg of fluorosilicic acid, 12kg of nitric acid, 11kg of polyethyleneimine, 15kg of magnesium nitrate, 15kg of bentonite, 5kg of sodium polyphosphate, and 30kg of water; it also includes 3kg of crosslinking agent epoxy chlorine propane.

[0032] A production method of stainless steel pickling passivation paste, comprising the following steps:

[0033] Add other weighed raw materials except bentonite into the polytetrafluoroethylene reaction kettle. After stirring for 5 minutes, continue to add weighed bentonite and 3kg of cross-linking agent. After continuing to stir for 50 minutes, a jelly-like stainless steel pickling passivation is obtained. paste. The prepared pickling passivation paste can be filled.

[0034] As a corrosive agent, fluosilicic acid does not release hydrogen fluoride during use, avoiding harm to construction personnel, and can effectively solve the problem of failure during product placement. ...

Embodiment 3

[0041] A pickling passivation paste for stainless steel, including 8kg of fluorosilicic acid, 15kg of nitric acid, 10kg of polyethyleneimine, 15kg of magnesium nitrate, 12kg of bentonite, 4kg of sodium polyphosphate, and 36kg of water; it also includes 3kg of crosslinking agent epoxy Chloropropane.

[0042] A production method of stainless steel pickling passivation paste, comprising the following steps:

[0043] Add other weighed raw materials except bentonite into the polytetrafluoroethylene reaction kettle. After stirring for 5 minutes, continue to add weighed bentonite and 3kg of cross-linking agent. After continuing to stir for 50 minutes, a jelly-like stainless steel pickling passivation is obtained. paste. The prepared pickling passivation paste can be filled.

[0044] As a corrosive agent, fluosilicic acid does not release hydrogen fluoride during use, avoiding harm to construction personnel, and can effectively solve the problem of failure during product placement. ...

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PUM

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Abstract

The invention discloses a stainless steel pickling passivation paste and a preparation method and a use method thereof. The stainless steel pickling passivation paste comprises the following components by mass percent: 8-12% of fluosilicic acid, 10-15% of nitric acid, 10-14% of polyethyleneimine, 12-15% of magnesium nitrate, 12-15% of bentonite, 3-5% of sodium polyphosphate and the balance of water. The stainless steel pickling passivation paste does not release hydrofluoric acid in the use process, is less harmful to the environment, does not injure skin, guarantees the health of builders, effectively removes various weld joints, oxide skin and rust on a stainless steel surface, and is a green, environment-friendly and efficient product.

Description

technical field [0001] The invention belongs to the technical field of pickling passivation, in particular to a stainless steel pickling passivation paste and its preparation method and use method. Background technique [0002] During the processing of stainless steel, it will cause surface defects, hidden dangers of corrosion, black scale and other metal compounds, yellow welds and grease during cold drawing, etc. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be acidified. Wash passivation treatment. At present, the main raw materials for the production of stainless steel pickling passivation paste are hydrofluoric acid and nitric acid (such as patent CN86101522). These products will release hydrofluoric acid during use, which is easy to burn human skin and retina, which is not conducive to the health of construction workers. , especially in a relatively closed construction environment (such as reactors, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23C22/36
CPCC23C22/368C23G1/085
Inventor 周成候夏宁赵本新戴忠晨渐春光葛怀普孟鹤
Owner NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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