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A high temperature protective coating for carbon steel

A protective coating, high temperature technology, applied in the field of high temperature protective coatings for carbon steel

Active Publication Date: 2012-02-01
上海钫淦新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the inherent defects of the existing high-temperature anti-oxidation coatings that mainly rely on the reaction between the components of the coating itself and the reaction between the coating components and oxygen, the present invention proposes a method in which some components preferentially react with the early generation of iron oxides at medium and high temperatures. Generate dense modified oxide scale, improve the structure and performance of carbon steel oxide scale, so as to use the self-modified oxide scale as a high-temperature protective coating for protection

Method used

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  • A high temperature protective coating for carbon steel
  • A high temperature protective coating for carbon steel
  • A high temperature protective coating for carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight component of the protective coating powder is: TiO 2 30%, Al 2 o 3 28%, Y 2 o 3 0.5%, ZrO 2 0.5%, HfO 2 0.5%, ZnO 20%, Fe 2 o 3 7%, SiO 2 12%, Na 2 O 0.7%, K 2 O 0.8%.

[0020] When using, first mix the powder and water 1:1 to form a slurry. Add binder potassium water glass, the binder quality accounts for 7% of slurry quality. A dispersant sodium carboxymethylcellulose is added, and the quality of the dispersant accounts for 0.5% of the total mass of the slurry.

[0021] Comparative experiment one:

[0022] Below is the comparative experiment for the oxidation performance of carbon steel without coating and the carbon steel oxidation performance adopting the coating of the present invention.

[0023] The general carbon steel Q235B steel plate is cut into small pieces, the surface is not coated with paint, heated to 1300°C in a muffle furnace, and the temperature is maintained for 1 hour. figure 1 It is a photo of the scale thickness of ...

Embodiment 2

[0028] The weight component of the selected protective coating is: TiO 2 40%, Al 2 o 3 25%, Y 2 o 3 0.5%, ZrO 2 1%, HfO 2 0.2%, ZnO 15%, Fe 2 o 3 5%, SiO 2 12%, Na 2 O 0.7%, K 2 O 0.6%.

[0029] When using, first mix the powder and water 1:1 to form a slurry. Add binder sodium water glass, the binder quality accounts for 6% of slurry quality. Add dispersant sodium carboxymethyl cellulose, and the quality of dispersant accounts for 0.8% of the total mass of slurry.

[0030] The difference between this embodiment and the first embodiment is that the steel type used in the experiment is 65Mn carbon spring steel, and the test results show that no obvious decarburization behavior is found. Other performance test results are similar to those in Example 1.

Embodiment 3

[0032] The weight component of this protective coating is: TiO 2 45%, Al 2 o 3 23%, Y 2 o 3 0.3%, ZrO 2 0.3%, HfO 2 0.8%, ZnO 18%, Fe 2 o 3 5%, SiO 2 11%, Na 2 O 0.8%, K 2 O 0.8%.

[0033] When using, first mix the powder and water 1:1 to form a slurry. The added binder is a mixture of sodium water glass and lithium water glass with a volume ratio of 1:1, and the quality of the binder accounts for 1.2% of the mass of the slurry. Add dispersant sodium carboxymethyl cellulose, and the quality of dispersant accounts for 7% of the total mass of slurry.

[0034] The difference between this embodiment and the first embodiment is that the steel type used in the experiment is X70 low-carbon alloy steel, and the test results show that the problem of descaling has not been effectively solved. Other performance test results are similar to those in Example 1.

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Abstract

The invention provides a high-temperature protective coating, which reacts with a small amount of preferentially formed oxide layer at 800°C-1350°C to form a denatured and dense oxide layer, thereby preventing further interpenetration of iron and oxygen by utilizing the compactness of the denatured oxide layer itself. The protective agent powder is mainly composed of the following mass fractions: TiO2 30%-70%, Al2O3 14%-28%, Y2O3 0.5%-1%, ZrO2 0.5%-1%, HfO2 0.5%-1%, ZnO 4%-20%, Fe2O3 4%-10%, SiO2 6%-12%, Na2O 0%-2%, K2O 0%-2%, the sum of the above components is 100%. When using, first mix the powder and water 1:1 to form a slurry. The binder water glass is added, accounting for 5%-15% of the mass of the slurry. The dispersant carboxymethyl cellulose accounts for 0.5%-1.5% of the total mass of the slurry. Laboratory experiments and pilot tests in iron and steel enterprises have proved that this protective coating is suitable for most carbon steels, has good suspension, does not affect heating, has excellent peeling performance of modified scale, good metal surface quality, and effectively prevents decarburization .

Description

Technical field: [0001] The invention relates to a high-temperature protective coating for carbon steel, with the protective temperature up to 1350°C. In particular, it is a protective coating for brushing or spraying on the surface of carbon steel to prevent oxidation and burning of the substrate during high-temperature heating. Background technique: [0002] Steel rolling in the metallurgical industry, no matter it is cold slab rolling or continuous casting and rolling, will always be oxidized in the heating furnace, resulting in a large amount of oxide scale, because the oxide scale is not easy to remove, so high-pressure water is required to remove phosphorus before rolling, which is wasteful Energy, and reduce the yield of carbon steel. Some high-carbon steels and alloy steels will decarburize when heated for a long time, resulting in a large amount of cutting or carburizing treatment for later products, resulting in serious waste. Therefore, it is necessary to take p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
Inventor 魏连启周旬叶树峰刘朋陈运法
Owner 上海钫淦新材料科技有限公司