A stainless steel passivation process for aviation tubes

A stainless steel and aviation tube technology, applied in the direction of metal material coating process, etc., can solve the problem of poor anti-fingerprint pollution on stainless steel surface

Inactive Publication Date: 2015-09-23
春兴铸造(苏州工业园区)有限公司
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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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  • A stainless steel passivation process for aviation tubes

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Embodiment Construction

[0025] As one of the best embodiments of a kind of aviation pipe stainless steel passivation process of the present invention, refer to the attached figure 1 , which includes the following steps:

[0026] Alkali degreasing, the stainless steel workpiece is immersed in the alkaline degreasing solution of 59 ℃ for 25 minutes, and the alkaline degreasing solution is an alkaline degreasing solution containing 4.9wt% sodium hydroxide;

[0027] In the pickling stage, soak the stainless steel workpiece with 40°C nitric acid solution for 2 minutes, and then rinse it with tap water at normal temperature;

[0028] Sand blasting, evenly spraying white corundum or glass beads on the surface of the workpiece;

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

[0030] In the passivation stage, the workpiece is soaked in the mixed solution of nitric acid and sodium dichromate solution at 40°C for 20 minutes to form...

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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 in particular relates to a stainless steel passivation process for aviation tubes. Background technique [0002] Aviation tube is an important material in the cutting-edge fields of aerospace, aviation and nuclear energy. With the development of science and technology, the use of aviation tube is increasing day by day. Aviation tubes are high-tech products with a long life cycle, and have extremely high quality requirements. Therefore, the control of its production process is particularly important. The production process of aviation tubes is relatively complicated, and they are special alloy tubes (such as high-temperature alloys, corrosion-resistant alloys, and stainless steel). The production of aviation tubes is generally multi-pass, in which rolling - degreasing - heat treatment - pickling is repeated. [0003] Take the stainless steel surface passivation process as an example, t...

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Application Information

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Patent Type & Authority Patents(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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