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Passivation process of citric acid and hydrogen peroxide of stainless steel

A technology of citric acid and hydrogen peroxide, which is applied in the field of metal surface treatment, can solve problems such as harsh operating conditions, harmfulness of passivation liquid to human body, and potential safety hazards, and achieve the effects of simple operation, reduced passivation cost, and improved safety

Inactive Publication Date: 2010-06-23
TIANJIN DEV ZONE HUATAI CONTAINER SERVICECO
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Most of the traditional stainless steel passivation uses nitric acid, hydrofluoric acid, chromic acid, etc. The passivation method is realized by the passivation method. Although the passivation process is mature and the passivation effect is stable, the operating conditions are harsh and the process temperature is high. Moreover, these passivation solutions are harmful to the human body, and there is a high safety hazard in the process of storage and use. Hidden dangers, there are also environmental protection problems in the treatment of waste passivation solution

Method used

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  • Passivation process of citric acid and hydrogen peroxide of stainless steel
  • Passivation process of citric acid and hydrogen peroxide of stainless steel
  • Passivation process of citric acid and hydrogen peroxide of stainless steel

Examples

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Embodiment

[0024] The application examples are listed below to specifically illustrate the specific operation process of the present invention in the process of pickling and passivating stainless steel.

[0025] (1). Degreasing the treatment area.

[0026] (2). If there is grinding and polishing in the area to be treated, Cl should be used - Rinse the surface with water (such as deionized water) with a mass fraction not greater than 25 μg / g.

[0027] (3). Pickling (such as using 10% to 15% citric acid) stainless steel to remove surface oxide and rust.

[0028] (4). Select Cl - Rinse the surface with water (such as deionized water) with a mass fraction not greater than 25 μg / g.

[0029] (5). According to the volume fraction of 3% citric acid, 10% hydrogen peroxide and 5% ethanol, a citric acid hydrogen peroxide passivation solution was prepared.

[0030] (6). Evenly spray or soak the prepared citric acid hydrogen peroxide passivation solution on the stainless steel surface, and passiv...

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Abstract

The invention discloses a stainless steel passivation process which is mainly technically characterized by taking citric acid and hydrogen peroxide as main compositions of a passivation solution and optimally selecting a volume fraction formula and a process of the stainless steel passivation fluid as follows: 3 percent of the citric acid, 10 percent of the hydrogen peroxide, 5 percent of ethanol, the temperature of 25 DEG C and the passivation time of 90min.

Description

[Affiliated technical field] [0001] The invention belongs to the technical field of metal surface treatment, and relates to the passivation treatment of stainless steel surface by using a chemical method, in particular to a process method for carrying out passivation treatment of stainless steel with citric acid and hydrogen peroxide as main components of passivation solution. [Background technique] [0002] As we all know, surface passivation treatment is to block or slow down the infiltration and diffusion of external corrosive media by forming a thin, dense, good coverage, and strong adhesion oxide film on the metal surface, so as to delay the corrosion of stainless steel. Effective way to speed. Stainless steel is also relative. Usually, in the presence of reducing agents or due to medium temperature and medium corrosiveness, various types of pitting (Pitting) often occur on the surface, which seriously affects the service life of stainless steel. Proper passivation tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
Inventor 徐邵纬刘凯廷
Owner TIANJIN DEV ZONE HUATAI CONTAINER SERVICECO
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