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Stainless steel rail pickling and passivation treatment method

A treatment method, pickling and passivation technology, applied in the coating process of metal materials, etc., can solve the problems of general corrosion resistance of stainless steel, harsh operating conditions, environmental pollution, etc., to achieve improved corrosion resistance, beautiful surface, and easy operation safe effect

Active Publication Date: 2015-06-03
珠海市椿田机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the pickling and passivation process of stainless steel enterprises mostly adopts the mixed acid process of hydrofluoric acid, nitric acid, and chromic acid. The disadvantage of this process is that it produces NOx gas and nitrite solution, which are the reduction products of nitric acid, which cause serious environmental pollution and require harsh operating conditions. , the corrosion resistance of stainless steel is also general

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A stainless steel rail pickling passivation treatment method is characterized in that: comprising the following steps:

[0027] (1) Pickling

[0028] Fully immerse the cleaned and degreased stainless steel rail workpieces in the pickling solution for 120 minutes, especially for SUS316;

[0029] Wherein: the pickling solution is composed of the following components in parts by weight: 5 parts of nitric acid, 2.5 parts of sodium fluoride, 0.6 parts of hydrochloric acid, 0.3 parts of ammonium citrate, 0.3 parts of mercaptoacetic acid, 0.2 parts of 2-mercaptobenzothiazole, 0.6 parts of hydrogen peroxide, 0.5 parts of potassium permanganate and 60 parts of water;

[0030] (2) Ultrasonic cleaning

[0031] Put the stainless steel rail workpiece after pickling treatment into the cleaning basket, and then put it into the ultrasonic cleaning machine equipped with cleaning solution, and clean it for 18 minutes;

[0032] Among them, the cleaning solution is composed of the follo...

Embodiment 2

[0043] A stainless steel rail pickling passivation treatment method is characterized in that: comprising the following steps:

[0044] (1) Pickling

[0045] Fully immerse the cleaned and degreased stainless steel rail workpiece in the pickling solution for 30 minutes, especially for SUS304.

[0046] Wherein: the pickling solution is composed of the following components in parts by weight: 6 parts of nitric acid, 1.5 parts of sodium fluoride, 0.5 parts of hydrochloric acid, 0.4 parts of ammonium citrate, 0.6 parts of mercaptoacetic acid, 0.2 parts of 2-mercaptobenzothiazole, 0.5 parts of hydrogen peroxide, 0.7 parts of potassium permanganate and 55 parts of water;

[0047] (2) Ultrasonic cleaning

[0048] Put the stainless steel rail workpiece after pickling treatment into the cleaning basket, then put it into the ultrasonic cleaning machine equipped with cleaning solution, and clean it for 15 minutes;

[0049] Among them, the cleaning solution is composed of the following c...

Embodiment 3

[0060] A stainless steel rail pickling passivation treatment method is characterized in that: comprising the following steps:

[0061] (1) Pickling

[0062] Fully immerse the cleaned and degreased stainless steel rail workpiece in the pickling solution for 90 minutes;

[0063] Wherein: the pickling solution is composed of the following components in parts by weight: 8 parts of nitric acid, 2 parts of sodium fluoride, 0.8 part of hydrochloric acid, 0.5 part of ammonium citrate, 0.5 part of thioglycolic acid, 0.3 part of 2-mercaptobenzothiazole, 0.5 parts of hydrogen peroxide, 0.8 parts of potassium permanganate and 50 parts of water;

[0064] (2) Ultrasonic cleaning

[0065] Put the stainless steel rail workpiece after pickling treatment into the cleaning basket, then put it into the ultrasonic cleaning machine equipped with cleaning solution, and clean it for 20 minutes;

[0066]Among them, the cleaning solution is composed of the following components by weight percentage: ...

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Abstract

The invention discloses a stainless steel rail pickling and passivation treatment method. The stainless steel rail pickling and passivation treatment method comprises the following steps: a cleaned and degreased stainless steel rail workpiece is completely soaked in a pickling solution for 30 to 120 minutes; the pickled stainless steel rail workpiece is placed in a cleaning basket, and the cleaning basket is then placed in an ultrasonic cleaning machine containing a cleaning solution for 15 to 20 minutes of cleaning; after cleaning, the stainless steel rail workpiece is blow-dried and then placed in an oven for baking; the stainless steel rail workpiece is placed in a passivation pool, which contains a passivation solution, of a passivation treatment box for 25 to 35 minutes of passivation treatment; the passivation pool is aerated during the passivation process; the stainless steel rail workpiece is placed in a neutralization pool containing a neutralization solution for 25 to 35 minutes of neutralization. The technique has the advantages that the surface cleanness of the stainless steel rail is totally guaranteed through pickling, ultrasonic cleaning, passivation and neutralization, and a compact oxidation film is formed, so that the corrosion resistance of the stainless steel rail is effectively improved, the stainless steel rail can be protected from rust for a long time, and the surface of the stainless steel rail looks beautiful.

Description

technical field [0001] The invention relates to the field of stainless steel treatment, in particular to a method for pickling and passivating stainless steel rails. Background technique [0002] During the processing of stainless steel rail workpieces, black and yellow scales will appear. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be pickled and passivated. Remove the oxide scale produced after welding and high-temperature processing to make it silvery and shiny, and form an oxide film with chromium as the main substance on the treated surface, so that secondary oxygen corrosion will not occur again, and the purpose of passivation is achieved , so as to improve the surface anti-corrosion quality of stainless steel products and prolong the service life of equipment. [0003] At present, the pickling and passivation process of stainless steel enterprises mostly adopts the mixed acid process of hydrofluor...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23C22/24
CPCC23G1/088
Inventor 郑继兵
Owner 珠海市椿田机械科技有限公司
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