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Ceramic layer and preparation method for improving anti-friction and anti-corrosion properties of Venturi tube inner wall

A technology of Venturi tube and ceramic layer, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of exhaust gas detection system failure, easy corrosion of inner wall, inability to accurately measure, etc., to improve service life, Strong corrosion resistance, excellent bonding effect

Active Publication Date: 2020-10-09
SHENZHEN KINGMAG PRECISION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exhaust gas of the engine has high temperature and strong corrosion characteristics. The inner wall of the Venturi tube made of aluminum alloy is in contact with the exhaust gas for a long time. If effective surface protection is not done, the inner wall is prone to corrosion, which will cause the entire exhaust gas detection system to fail and cannot be accurately measured.
The existing technology has been using traditional processes such as baking paint, electroplating, and anodic oxidation to make the surface of the Venturi tube inner wall anti-corrosion, but the effect is not ideal, and it causes great pollution to the environment. Therefore, it is urgent to develop a new surface treatment technology to solve this problem. problem

Method used

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  • Ceramic layer and preparation method for improving anti-friction and anti-corrosion properties of Venturi tube inner wall
  • Ceramic layer and preparation method for improving anti-friction and anti-corrosion properties of Venturi tube inner wall
  • Ceramic layer and preparation method for improving anti-friction and anti-corrosion properties of Venturi tube inner wall

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Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1 of the present invention: as figure 1 with figure 2 As shown, a ceramic layer that improves the anti-friction and corrosion resistance of the inner wall of the Venturi tube is grown on the surface of the Venturi tube substrate. The composition of the ceramic layer is alumina and aluminum silicate, and the thickness is 5-15 μm. It can be seen from the figure that a ceramic layer with nanoscale, disorderly, and crater-shaped blind micropores is formed on the surface of the aluminum substrate of the Venturi tube. Combination, this combination method leads to excellent bonding between the ceramic layer and the substrate, and a large number of nanoscale holes on the surface of the ceramic layer are blind micropores that do not penetrate into the substrate, which is conducive to improving the anti-corrosion performance of the entire ceramic layer. Specifically, the ceramic layer is very uniform, because it contains α-AL 2 o 3 (commonly known as corundum) make...

Embodiment 2

[0042] Embodiment 2: as Figure 1-Figure 3 Shown, a kind of preparation method of the ceramic layer that improves anti-friction and corrosion resistance performance of Venturi tube inner wall, is used for preparing aforementioned ceramic layer that improves the anti-friction and corrosion resistance performance of Venturi tube inner wall, comprises the following process:

[0043] S1, degreasing the surface of the Venturi tube substrate; specifically includes: fixing the qualified Venturi tube substrate on the hanger to ensure that the Venturi tube base workpiece and the hanger are unimpeded and fixed firmly to ensure that there will be no short circuit; The pipe matrix workpiece and hanger are hoisted into the ultrasonic degreasing tank by the mechanical arm for degreasing. The degreasing liquid in the ultrasonic degreasing tank is 2-10% sodium hydroxide solution, the temperature is 40-60°C, and the time is 3-5 minute;

[0044] S2, cleaning the Venturi tube matrix; specifical...

Embodiment 3

[0048] Embodiment 3: as figure 1 , figure 2 with Figure 4 Shown, a kind of preparation method of the ceramic layer that improves anti-friction and corrosion resistance performance of Venturi tube inner wall, is used for preparing aforementioned ceramic layer that improves the anti-friction and corrosion resistance performance of Venturi tube inner wall, comprises the following process:

[0049] S1, degreasing the surface of the Venturi tube substrate; specifically includes: fixing the qualified Venturi tube substrate on the hanger to ensure that the Venturi tube base workpiece and the hanger are unimpeded and fixed firmly to ensure that there will be no short circuit; The pipe matrix workpiece and hanger are hoisted into the ultrasonic degreasing tank by the mechanical arm for degreasing. The degreasing liquid in the ultrasonic degreasing tank is 2-10% sodium hydroxide solution, the temperature is 40-60°C, and the time is 3-5 minute;

[0050] S2, cleaning the Venturi tube...

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Abstract

The invention relates to the technical field of engine tail gas detection systems, in particular to a ceramic layer for improving antifriction and corrosion resistance of the inner wall of a venturi tube and a preparation method of the ceramic layer. The ceramic layer is grown on the surface of a venturi tube substrate, and the ceramic layer is prepare from aluminum oxide and aluminum silicate andhas the thickness of 5-15 micrometers. The preparation method of the ceramic layer comprises the following processes of S1, deoiling the surface of the venturi tube substrate, S2, cleaning the venturi tube substrate, S3, growing the ceramic layer on the surface of the venturi tube substrate, S4, cleaning the venturi tube again, and S5, drying the venturi tube. The ceramic layer obtained by the novel surface treatment technology has the advantages of being high in hardness, strong in corrosion resistance, uniform in thickness, good in bonding force, resistant to high temperature, high in flameretardance and free of six harmful substances, the antifriction an corrosion resistance of the inner wall of the venturi tube can be improved, and therefre the service life of the venturi tube is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of engine exhaust detection systems, in particular to a ceramic layer and a preparation method for improving the anti-friction and anti-corrosion performance of the inner wall of a Venturi tube. Background technique [0002] Venturi tube is a device for measuring fluid pressure difference. It is used in many fields such as petroleum, gold refining, factory, chemical industry, etc. It is also used in the exhaust gas detection system of automobiles. Due to its complex design structure and automobile lightweight requirements, the Venturi tube is generally produced and processed by aluminum alloy die-casting and machining. The exhaust gas of the engine has high temperature and strong corrosion characteristics. The inner wall of the venturi tube made of aluminum alloy is in contact with the exhaust gas for a long time. If effective surface protection is not done, the inner wall is prone to corrosion, which will c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06C25D11/16C23G1/22
CPCC23G1/22C25D11/024C25D11/026C25D11/06C25D11/16
Inventor 文晓斌欧阳晶
Owner SHENZHEN KINGMAG PRECISION TECH
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