Aviation pipe stainless steel passivation technology

A technology for stainless steel and aviation tubes, which is applied in the coating process of metal materials, etc., and can solve the problems of poor anti-fingerprint pollution on the surface of stainless steel

Inactive Publication Date: 2013-09-25
春兴铸造(苏州工业园区)有限公司
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Therefore, seeking a safe and efficient stainless steel passivation effect and solving the problem of poor anti-fingerprint pollution on the surface of stainless steel are urgent problems to be solved by the entire industry

Method used

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  • Aviation pipe stainless steel passivation technology

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Embodiment Construction

[0025] As one of the best embodiments of the stainless steel passivation process for aeronautical tubes of the present invention, see the attached figure 1 , Which includes the following steps:

[0026] Alkaline degreasing, immersing the stainless steel workpiece in an alkaline degreasing solution at 59°C for 25 minutes, the alkaline degreasing solution being an alkaline degreasing solution containing 4.9wt% sodium hydroxide;

[0027] In the pickling stage, soak the stainless steel workpiece with 40℃ nitric acid solution for 2 minutes, and then rinse with tap water at room temperature by sprinkling;

[0028] Sandblasting, spray white steel jade or glass beads evenly on the surface of the workpiece;

[0029] For the first water cleaning, soak in tap water at 40°C for 3 minutes, then rinse with tap water at room temperature;

[0030] In the passivation stage, soak the workpiece in a mixture of nitric acid and sodium dichromate solution at 40°C for 20 minutes to form a protective film on ...

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Abstract

The invention belongs to an aviation flight field, more specifically to an aviation pipe stainless steel passivation technology, comprising the following steps of: alkali derosination, a pickling stage; sandblast; cleaning with water for a first time; a passivation stage; cleaning with water for a second time; and drying. The aviation pipe stainless steel passivation technology provided by the invention has advantages of safety and high efficiency; solves a problem of bad fingerprint pollution resistance for the surface of stainless steel; and makes sure decorative characteristic of the surface of stainless steel.

Description

Technical field [0001] The invention belongs to the field of aviation manufacturing, and specifically relates to a stainless steel passivation process for aviation tubes. Background technique [0002] Aviation tubes are important materials in the cutting-edge fields of aerospace, aviation and nuclear energy. With the development of science and technology, the use of aviation tubes is increasing. Aviation tubes are high-tech and long-life products, and their quality requirements are extremely high. Therefore, the control of its production process is particularly important. The production process of aviation tube is more complicated, and it is special alloy tube (such as high temperature alloy, corrosion resistant alloy, stainless steel). The production of aviation tubes is generally multi-pass, in which rolling-degreasing-heat treatment-pickling cycle is repeated. [0003] Take the stainless steel surface passivation process as an example. The oxide layer on the surface of stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/24C23C22/78
Inventor 程娇
Owner 春兴铸造(苏州工业园区)有限公司
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