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A kind of alkaline iron oxide anti-corrosion coating and preparation method thereof

An anti-corrosion coating, iron oxide technology, applied in anti-corrosion coatings, coatings, fire-resistant coatings, etc., can solve problems such as poor corrosion resistance, and achieve the effects of excellent mechanical properties, easy processing and preparation, and cheap and readily available raw materials

Active Publication Date: 2021-01-26
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various coatings (such as resins and ceramics) in actual industrial applications can meet the above requirements to varying degrees, they have poor corrosion resistance in environments containing corrosive ions such as Cl- and F-.

Method used

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  • A kind of alkaline iron oxide anti-corrosion coating and preparation method thereof
  • A kind of alkaline iron oxide anti-corrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using A3 steel plate as the application material (metal material substrate), a basic iron oxide layer with a thickness of 25 μm was prepared on its surface by plasma spraying method (wherein the mass ratio of lithium: iron: oxygen = 1.7:67.4:30.9). This is the basic iron oxide anti-corrosion coating with a single-layer structure, and its actual photo is as follows figure 1 shown.

[0018] The above-mentioned A3 steel plate prepared with a single-layer alkaline iron oxide anti-corrosion coating on the surface was used as the hull material of a fishing boat, soaked in seawater for 2 years, and the same batch of original A3 steel plates (without any anti-corrosion coating) were used as a control for the same seawater immersion experiments. It was found that the A3 steel plate with basic iron oxide anti-corrosion coating did not undergo obvious corrosion, and the anti-corrosion coating remained intact, while the surface of the original A3 steel plate was more severely corr...

Embodiment 2

[0020] 304 stainless steel plate is used as the application material, and Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 (molar ratio Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =43.5:31.5:25) The molten salt is used as the electrolyte, and the applied material is the anode nickel plate as the cathode, and an alkaline iron oxide layer (lithium: iron: oxygen) with a thickness of 10 μm has been prepared on its surface by means of electrochemical pre-oxidation. Mass ratio=7.3:58.9:33.8), this is the basic iron oxide anticorrosion coating of single-layer structure.

[0021] The 304 stainless steel plate prepared with a single-layer alkaline iron oxide anti-corrosion coating on the surface was used as the structural material of the offshore drilling platform, and was exposed in the ocean air for 3 years. It was found that the 304 stainless steel plate with the basic iron oxide anti-corrosion coating did not undergo obvious corrosion, and the anti-corrosion coating remained intact. This shows that t...

Embodiment 3

[0023] Using ductile iron pipe as the application material, a basic iron oxide layer with a thickness of 20 μm was prepared on the surface by chemical vapor deposition (mass ratio of lithium: iron: oxygen = 1.7:67.4:30.9), which is a single layer Structural alkaline iron oxide anti-corrosion coating.

[0024] The above-mentioned nodular cast iron pipes prepared with a single-layer alkaline iron oxide anti-corrosion coating on the surface were used as water pipelines and buried one meter underground in typical soil in Wuhan for 4 years. It was found that no obvious corrosion occurred in the ductile iron pipe. This result indicates that the basic iron oxide anticorrosion coating has excellent corrosion protection ability for iron-based materials in soil environment.

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Abstract

The invention relates to the technical field of metal material anticorrosion, and specifically discloses a basic iron oxide anticorrosion coating and a preparation method thereof. The anticorrosion coating comprises the following components (by weight): 1%-8% of lithium, 50%-69% of iron, and 30%-35% of oxygen. The coating is a single-layer or multi-layer composite structure, which can be used for high and low temperature corrosion protection of iron, iron-based alloys, and steel metal materials in water, atmosphere, soil, industrial media, and molten salt electrolytes, and has a wide range of environments and temperatures. range, especially resistant to Cl ‑ and F ‑ erosion, showing excellent anti-aging ability.

Description

technical field [0001] The invention relates to the technical field of metal corrosion protection, in particular to an alkaline iron oxide anticorrosion coating and a preparation method thereof. Background technique [0002] Metal materials are widely used in various fields of national economy and people's livelihood, and constitute the material basis of human scientific and technological civilization. Metallic materials with high chemical potential are prone to oxidative corrosion, which causes great material loss and has a significant negative impact on production. Research shows that the total cost of national corrosion in 2014 exceeded RMB 2.1 trillion, accounting for about 3.34% of GDP in that year. Therefore, metal corrosion protection has huge economic and social benefits. [0003] The anti-corrosion coating can effectively isolate the metal material from the corrosive medium, thereby improving the corrosion resistance of the metal and prolonging its service life. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11C23C4/134C23C8/14C23C14/08C23C16/40C25D11/34C09D1/00C09D5/08C09D5/18
CPCC09D1/00C09D5/08C09D5/18C23C8/14C23C14/08C23C16/40C23C16/406C25D11/34C23C4/11C23C4/134
Inventor 汪的华杜开发郑开元朱华毛旭辉甘复兴
Owner WUHAN UNIV
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