Method for preparing lithium ferrite anticorrosive coatings by flame spraying

A technology of lithium ferrite and flame spraying, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the requirement that the whole life of the grounding device cannot be met, and the ferrite conductive anti-corrosion coating has not been prepared and other problems, to achieve good spraying adaptability, optimize spraying process parameters, and good conductivity

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the current existing sintering, casting and other processes are difficult to realize the preparation of large-scale ferrite products. Therefore, using the grounding material coating protection technology, a lithium ferrite anti-corrosion coating is coated on the surface of conventional carbon steel grounding materials to ensure grounding. Under the premise of good electrical conductivity of the body, it can effectively improve the corrosion resistance of the grounding device body, and has a good application prospect in the field of grounding anti-corrosion technology
US Patent 3850701 filed by Yitai et al pointed out that the maximum thickness of the ferrite coating deposited by chemical method is only 0.02mm, which cannot meet the requirements of the whole life of the grounding device, and has not prepared a practical ferrite conductive anti-corrosion coating. Floor
In recent years, the rapid development of thermal spraying technology has provided a good foundation for the preparation of high-performance ferrite coatings. Issues such as technical economy remain to be resolved

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  • Method for preparing lithium ferrite anticorrosive coatings by flame spraying

Examples

Experimental program
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Effect test

example 1

[0029] Oxygen-acetylene flame spraying was adopted, and the bonding primer and lithium ferrite layer shown in Table 1 were respectively used for the metal bonding primer and the spraying process parameters of Example 1: Lithium ferrite layer. The spraying powder materials of the junction layer and ferrite are sprayed successively on the cleaned and sandblasted Q235 steel substrate, the bonding layer is 0.11mm, and the ferrite coating is 0.22mm.

[0030] The average porosity of the ferrite conductive coating is calculated to be 3.6% by using Ia32 image analysis software.

[0031] The bonding strength of the coating and the substrate was measured on a universal testing machine by the bonding tensile method, and the bonding strength of the coating was measured to be 25.6Mpa by stretching at a tensile speed of 1mm per minute.

[0032] The electrical resistance of the coating was tested by the two-terminal method and the resistivity was calculated. In order to reduce the contact r...

example 2

[0035]Oxygen-acetylene flame spraying is used, the metal bonding primer and the ferrite layer respectively adopt the bonding primer shown in Table 1 and Example 2: the spraying process parameters of the ferrite layer, and the bonding primer with a particle size of 20 to 100 μm is used. The spraying powder material of ferrite and ferrite is sprayed onto the cleaned and sandblasted Q235 steel substrate successively, the bonding bottom layer is 0.10mm, and the ferrite coating is 0.20mm.

[0036] The average porosity of the ferrite coating was calculated to be 2.0% by Ia32 image analysis software.

[0037] The bonding strength of the coating and the substrate was measured on a universal testing machine by the bonding tensile method, and the bonding strength of the coating was measured to be 28.8Mpa by stretching at a tensile speed of 1mm per minute.

[0038] The electrical resistance of the coating was tested by the two-terminal method and the resistivity was calculated. In order...

example 3

[0041] Oxygen-acetylene flame spraying is adopted, and the metal bonding primer and the ferrite layer respectively adopt the bonding primer shown in Table 1 and Example 3: The spraying process parameters of the ferrite layer, and the bonding primer with a particle size of 20 to 100 μm is used. and ferrite spraying powder materials are sprayed successively on the Q235 steel substrate that has been cleaned and sandblasted, the bonding bottom layer is 0.12mm, and the ferrite coating is 0.21mm.

[0042] The average porosity of the ferrite coating was calculated to be 3.0% by Ia32 image analysis software.

[0043] The bonding strength of the coating and the substrate was measured on a universal testing machine by the bonding tensile method, and the bonding strength of the coating was measured to be 26.2Mpa by stretching at a tensile speed of 1mm per minute.

[0044] The electrical resistance of the coating was tested by the two-terminal method and the resistivity was calculated. I...

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Abstract

The invention relates to a method for preparing lithium ferrite anticorrosive coatings by flame spraying. Lithium ferrite conductive anticorrosive coating materials, prepared by adopting a manipulator through optimizing the technological parameters of oxygen-acetylene flame spraying, have excellent corrosion resistance and conductivity. The preparation method, provided by the invention, has the advantages of simple process, high deposition rate, strong repeatability and low facility request, can directly implement the spraying construction on site so as to meet the construction and repair requirements of actual grounding network engineering, and can be applied to metallic matrix surfaces with different shapes or different sizes; in particular, the preparation method has more advantages when preparing large-area anticorrosive conductive coatings for practical application; and meanwhile, the maintenance is simple in the workpiece service process, so that the preparation method is suitable for industrial popularization and application.

Description

【Technical field】 [0001] The invention relates to a thermal spraying method, in particular to a method for preparing a lithium ferrite anticorrosion coating by flame spraying. 【Background technique】 [0002] The grounding device is an important part of the grounding system of the power transmission and transformation project. The corrosion of the grounding grid is the main factor leading to the deterioration of the grounding protection system, which is directly related to the operation safety of the power transmission and transformation project and the personal safety of power operation and maintenance personnel. The grounding grid is buried underground, which is a concealed project. It is impossible to have an intuitive understanding of its corrosion status during operation and it is difficult to overhaul. The covered soil needs to be excavated for every overhaul and maintenance, which greatly increases the maintenance cost and prolongs the maintenance time, which is very in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/10C23C4/11C23C4/129
Inventor 祝志祥陈新韩钰聂京凯陈保安马光
Owner STATE GRID CORP OF CHINA
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