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Method for forming anticorrosive coating on surfaces of metal parts

A technology for metal parts and anti-corrosion coatings, which is applied in the coating process of metal materials, devices for applying liquid to the surface, coatings, etc., can solve the problems of liquid metal corrosion, limit the application range of liquid metal, etc. , Good anti-cold and thermal shock performance, the effect of expanding the scope of application

Inactive Publication Date: 2019-01-08
YUNNAN KEWEI LIQUID METAL VALLEY R & D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Liquid metals have broad application prospects in replacing traditional liquid media, but liquid metals will corrode metals in direct contact with them to varying degrees, and the higher the temperature, the more serious the corrosion, which greatly limits the application range of liquid metals. Corrosion of metals is an urgent problem

Method used

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  • Method for forming anticorrosive coating on surfaces of metal parts
  • Method for forming anticorrosive coating on surfaces of metal parts
  • Method for forming anticorrosive coating on surfaces of metal parts

Examples

Experimental program
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Embodiment 1

[0040] Refer to attached figure 1 , 2 , the present embodiment provides a method of forming a liquid metal corrosion-resistant anticorrosion coating on the surface of a metal component by chemical vapor deposition. The metal pipeline 7 is used as the metal component, and the inner wall of the pipeline 7 is coated. figure 1 Schematic diagram of the cross-section after the anti-corrosion coating is applied to the inner wall of the metal pipeline, figure 2 Flow diagram of tungsten plating for chemical vapor deposition.

[0041] Specific steps are as follows:

[0042] (1) Clean the pipeline 7 with a metal-specific cleaning agent for degreasing and rust removal, and then dry it for later use.

[0043] (2) Using tungsten hexafluoride 9 as the reaction source gas, heat tungsten hexafluoride 9 to be vaporized above the boiling point, fully mix it with hydrogen gas 10 in the gas mixer 11, and then pass it into the chemical vapor deposition reaction chamber 12. They are: tungsten h...

Embodiment 2

[0046] Refer to attached image 3 , the present embodiment provides a method of forming a liquid metal corrosion-resistant anticorrosion coating on the surface of the metal component by thermal spraying, and the outer surface of the metal component 5 is treated with aluminum oxide coating, image 3 Flow chart for preparing anti-corrosion coating by spraying method;

[0047] The specific steps are as follows: (1) Degrease and derust the metal parts with a general-purpose cleaning agent, dry them after cleaning, and set aside.

[0048] (2) Perform pretreatment on the surface of component 5, which includes roughening the surface and pre-spraying a layer of nickel-aluminum bonding primer to enhance the bonding strength between the coating and the substrate (conventional means in this field can be used).

[0049] (3) Use alumina powder as raw material (thermal spraying raw material 18), through heat source 16, be heated to melting or semi-molten state (according to the judgment of...

Embodiment 3

[0054] Refer to attached Figure 4 , this embodiment provides a specific application device after coating treatment, the specific steps are as follows:

[0055] Figure 4 It is a schematic diagram of the hydraulic transmission unit after anticorrosion treatment. Before assembly, the small piston 4, the pipe 7, and the large piston 8 are anti-corrosion treated, and the surface of the pipe 7 is coated with tungsten, and the tungsten coating of the pipe 7 is carried out by the method of embodiment 1. Do a tungsten coating on the surface of small piston 4 and large piston 8, adopt the thermal spraying method of embodiment 2 to carry out.

[0056] In particular, tungsten hexafluoride is highly corrosive and easy to hydrolyze. During the entire vapor deposition process, good airtightness is required, and moisture and air should be removed as much as possible. When necessary, vacuum pumping and inert protective gas should be introduced.

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Abstract

The invention relates to a method for forming an anticorrosive coating on surfaces of metal parts. The anticorrosive coating comprises one or more of a rare nonferrous metal layer, an inorganic oxidelayer and a liquid coating layer, wherein the forming method of the anticorrosive coating is one or more of a chemical vapor deposition method, a dipping method and a hot spray method. The anticorrosive coating is formed on the surfaces of the metal parts, is particularly suitable for corrosion prevention of liquid metal, and can prevent the high temperature liquid metal and a metal base from direct contact, so that the corrosion prevention effect is achieved. The corrosion problem for the base material by the high temperature liquid metal during using is solved, the industrial cost is reduced, the application range of the liquid metal is enlarged, and at the using temperature, the anticorrosive coating has high corrosion resistance for the liquid metal, and has the characteristics of favorable cold and hot impact property, high adhesive force and low porosity factor.

Description

technical field [0001] The invention relates to anti-corrosion technology, in particular to a method for forming an anti-corrosion coating on the surface of metal parts. Background technique [0002] Liquid metal usually refers to a metal that is liquid near room temperature, such as gallium or its alloys with a melting point below 30°C, or a low-melting metal alloy that can be liquid at a slightly higher temperature range, such as 40°C-200°C . Liquid metal has the characteristics of low melting point and high boiling point. For example, gallium has a melting point of 29.77°C and a boiling point of 2403°C. Utilizing the characteristics of low melting point and high boiling point of liquid metal, liquid metal can be used in hydraulic transmission and differential pressure transmitter. [0003] Using liquid metal to replace liquid media such as silicone oil, fluorine oil, and vegetable oil used in traditional differential pressure transmitters can solve the problem of easy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/14C23C4/11C23C4/08C23C4/134B05D1/02B05D1/18B05D5/00
CPCB05D1/02B05D1/18B05D5/00C23C4/08C23C4/11C23C4/134C23C16/14
Inventor 杨荣姜浩蔡昌礼邓中山
Owner YUNNAN KEWEI LIQUID METAL VALLEY R & D CO LTD
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