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Aluminum oxide coating on metal substrate surface and preparation method thereof

A technology of alumina coating and metal substrate, which is applied in the anti-corrosion, anti-penetration and heat insulation coating of equipment and various steel pipes, the alumina coating on the surface of metal substrate and its preparation, and the field of superalloy, which can solve the problem Performance decline, matrix protection effect is not obvious, etc., to achieve the effect of lower crystal transformation temperature, excellent corrosion resistance, and improved wetting performance

Active Publication Date: 2018-02-16
CHINA PETROCHEMICAL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of high-temperature calcination to prepare alumina coating requires a temperature above 800°C to form a γ-phase alumina layer with corrosion resistance, and calcination above 1200°C to obtain the most stable α-phase alumina. Metal materials, most of them undergo phase transformation above 600°C, and their performance drops significantly
At the same time, the thickness of the coating prepared by the traditional sol method is relatively low, generally less than 500nm, and the protective effect on the substrate is not obvious. It has important theoretical and engineering significance to ensure the mechanical and mechanical properties of the metal matrix

Method used

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  • Aluminum oxide coating on metal substrate surface and preparation method thereof
  • Aluminum oxide coating on metal substrate surface and preparation method thereof
  • Aluminum oxide coating on metal substrate surface and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0021] (1) Mix distilled water, aluminum isobutoxide and hydrochloric acid evenly in a molar ratio of 90:1:0.15, stir and react at 85°C for 4 hours, wherein hydrochloric acid is added during the stirring process, and finally a transparent sol is obtained;

[0022] (2) Put the above-prepared sol in a hydrothermal reactor with a filling degree of 70%, then seal the reactor, heat the internal sol to 210°C and keep it warm for 12 hours;

[0023] (3) Clean and degrease the surface of 40# carbon steel (chrome hardness = 35) and then polish it;

[0024] (4) Take out the sol after heat preservation treatment, and adopt the method of spin coating, that is, fixedly rotate the carbon steel on the spin coater, and continuously drip the above sol onto the surface of the substrate to cover the surface evenly, and the spin coater rotates at 50 rpm / minute;

[0025] (5) After 30 seconds of spin coating, stop the sol dripping and rotation, dry the substrate in the air until the surface liquid...

example 2

[0027] (1) Add deionized water and aluminum isopropoxide (analytically pure) into a three-necked flask at a molar ratio of 100 to 1, heat it to 85°C with magnetic stirring in a water bath, then add nitric acid with a molar ratio of 0.1, and continue to keep warm After stirring for 6 hours, a transparent alumina sol was obtained.

[0028] (2) The surface of the test martensitic steel (Chrome hardness = 30) is polished on a polishing machine with 600-mesh, 1500-mesh, and 3000-mesh sandpaper in sequence, and then the substrate is placed in acetone for ultrasonic cleaning to remove the surface After the oil stains were removed, they were placed in a vacuum drying oven for dry storage.

[0029] (3) The obtained alumina sol was introduced into a hydrothermal reaction kettle with a filling degree of 50%, and the reaction kettle was placed in an oven at 200° C. for 12 hours and then taken out.

[0030] (4) Fix the substrate on the spin coater with a rotating speed of 120 rpm. Use an ...

example 3

[0034] (1) Add pure water and aluminum isopropoxide (industrial grade) into a three-necked flask at a molar ratio of 100 to 1, mechanically stir in a water bath and heat to 80°C, then add nitric acid with a molar ratio of 0.1, and continue to keep warm and stir After 10 hours, a nearly transparent alumina sol was obtained.

[0035] (2) The surface of the 9Cr steel (Chrome hardness = 35) used in the test is polished and polished on a polishing machine with 600-mesh and 1500-mesh sandpaper in sequence, and then the substrate is placed in absolute ethanol for ultrasonic cleaning to remove the oil on the surface Store dry in a vacuum desiccator.

[0036] (3) The obtained alumina sol was introduced into a hydrothermal reaction kettle with a filling degree of 70%, and the reaction kettle was placed in an oven at 220° C. for 12 hours and then taken out.

[0037] (4) Fix the substrate on the spin coater with a rotating speed of 80 rpm. Use an acid burette to drop the above-mentioned ...

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Abstract

The invention discloses an aluminum oxide coating on the surface of a metal substrate and a preparation method thereof. The aluminum oxide coating is mainly composed of γ-phase aluminum oxide, and the thickness is between 1 micron and 10 microns. Carbon steel, structural steel and other alloy materials. Heat and stir water, aluminum organic alcohol compounds and inorganic acids in proportion to obtain alumina sol, then subject the sol to hydrothermal treatment, and then coat and dry the sol after hydrothermal treatment on the surface of the metal substrate for several times, and finally heat it under 500°C Calcination treatment is carried out in a high temperature environment to obtain a dense γ-phase alumina coating with a certain thickness. The aluminum oxide coating provided by the invention not only has good corrosion resistance and anti-permeation performance, but also has a certain thickness and good compactness.

Description

technical field [0001] The invention belongs to metal surface treatment technology, in particular to an aluminum oxide coating on the surface of a metal substrate and a preparation method thereof, which is mainly aimed at the surface treatment of alloys and other metal products, especially those involving superalloys, equipment and various steel pipes Anti-corrosion, anti-penetration and thermal insulation coating. Background technique [0002] The sol-gel method is a coating preparation technology for surface treatment of metals. Using sol-gel technology, ceramic or organic coatings with specific functions can be prepared on glass, plastic, metal and other substrates (Chandradass J, Balasubramanian M, Effect of magnesium oxide on sol-gel spun aluminum and aluminum-zirconia fibers [J]. Journal of the European Ceramic Society, 2006, 26(13): 2611-2617). In the 1960s and 1970s, as the energy, manufacturing and electronic communication fields required higher and higher material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08
Inventor 高继峰银永明刘德绪龚金海万龙
Owner CHINA PETROCHEMICAL CORP
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