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Anti-oxidation coating for heat treatment of iron and preparation method thereof

An anti-oxidation coating and coating technology, which is applied to coatings, devices for coating liquids on surfaces, special surfaces, etc., can solve the problem of easy precipitation and agglomeration of solid components of anti-oxidation coatings, short heat treatment oxidation protection time, and difficult to mix evenly. and other problems, to achieve the effects of excellent oxidation resistance, reduced oxidation weight gain, and stable coating performance.

Active Publication Date: 2012-07-18
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In response to the above defects, people have developed and disclosed a variety of high-temperature anti-oxidation coatings for metals with higher applicable temperatures, such as "A Heat Treatment Anti-oxidation Coating for Superalloys" with Chinese Patent Application No. 200910243717.8. The applicable temperature of the coating is 1300-1400°C; Chinese patent (application number 200610022334.4) discloses a casting coating for large-scale castings, which is an alcohol-based zircon powder casting coating. The material contains zircon powder, lithium-based bentonite, deionized water, and modified Magnesium aluminum silicate, etc., the applicable temperature of the coating is 1200 ℃ 30'; Chinese patent (application number is 200810012544.4) discloses "high temperature and oxidation resistant coating for metal materials", the applicable temperature of the coating is 1240-1260 ℃; No. 93106060.5 is a pretreatment-free high-temperature anti-oxidation coating, which is suitable for a temperature of 800-1500 °C; however, the heat treatment oxidation protection time of these anti-oxidation coatings is relatively short. The heat treatment and heat preservation time is 2-5 hours; the heat treatment oxidation protection time of "metal material high temperature and oxidation resistance coating" is only 4 hours; and in the manufacturing process of heavy equipment, especially nuclear power equipment, the low and medium alloy steel is used for tens of hours at high temperature. The heat treatment of the above time is essential, so it is very important to solve the anti-oxidation in this case
[0005] In addition, the existing high-temperature resistant and anti-oxidation coatings also have various defects, such as the solid components in the anti-oxidation coatings are very easy to precipitate and agglomerate, it is difficult to mix evenly during use, and the anti-oxidation effect is not obvious; Steel surface needs to be treated and it is difficult to remove after use

Method used

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  • Anti-oxidation coating for heat treatment of iron and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] Take glass powder 38, boron nitride 25, dichromium trioxide 5, metal aluminum powder 5, form the solid powder in the anti-oxidation coating, these several kinds of solids are added to 100 parts of xylene, 25 parts of organic silicon resin, 1.5 parts of modified magnesium aluminum silicate, all of which are parts by weight; high-speed stirring for 50 minutes, and then grinding with a colloid mill for 3 times to obtain the heat-treated anti-oxidation coating for carbon steel or alloy steel of the present invention.

[0038]Wherein the glass powder contains 40wt% silicon oxide, 25wt% boron oxide, 8wt% aluminum oxide, 15wt% barium oxide, 5wt% cerium oxide, 6wt% sodium oxide, 1wt% potassium oxide; The fineness is 800 mesh, the fineness of boron nitride is 1200 mesh, the fineness of chromium trioxide is 320 mesh, and the fineness of metal aluminum powder is 800 mesh.

[0039] Coating process: apply the paint on the A3 carbon steel workpiece cleaned with solvent gasoline, the ...

Embodiment 2

[0042] The preparation method of the anti-oxidation coating is the same as in Example 1, and the ratio of raw materials and performance are shown in Table 1; wherein the glass powder contains 30wt% of silicon oxide, 23wt% of boron oxide, 10wt% of aluminum oxide, 15wt% of oxidized Barium, 9wt% sodium oxide, 10wt% cerium oxide, 3wt% potassium oxide; the fineness of glass powder is 900 mesh, the fineness of boron nitride is 1300 mesh, the fineness of chromium trioxide is 420 mesh, The fineness of metal aluminum powder is 900 mesh.

[0043] The coating process is the same as in Example 1, and the heating conditions: see Table 1 for heating temperature, holding time, and application effect.

Embodiment 3

[0045] The preparation method of the anti-oxidation coating is the same as in Example 1, and the ratio of raw materials and performance are shown in Table 1; wherein the glass powder contains 50wt% of silicon oxide, 12wt% of boron oxide, 7wt% of aluminum oxide, 13wt% of oxide Barium, 4wt% sodium oxide, 8wt% cerium oxide, 6wt% potassium oxide; the fineness of glass powder is 1000 mesh, the fineness of boron nitride is 1400 mesh, the fineness of chromium trioxide is 520 mesh, The fineness of the metal aluminum powder is 1000 meshes; the Al content in the metal aluminum powder is greater than 99.9%.

[0046] The coating process is the same as in Example 1, and the heating conditions: see Table 1 for heating temperature, holding time, and application effect.

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Abstract

The invention belongs to the technical field of the preparation of high-temperature anti-oxidation coatings, in particular to an anti-oxidation coating used in a long-time heat treatment process of iron, and the like at high temperature. The coating comprises solid powder and liquid, and is characterized in that the solid powder comprises following components by weight part: 30 to 50 parts of glass powder, 10 to 50 parts of boron nitride, 2 to 5 parts of chromic oxide and 3 to 10 parts of metal aluminum powder; and the liquid comprises following components by weight part: 0.1 to 5 parts of modified magnesium aluminosilicate, 20 to 35 parts of organic silicone resin and 100 parts of xylene. Through the adoption of the coating, oxydic weight gain of carbon steel or alloy steel can be guaranteed to be reduced by more than 80 percent in the heat treatment process for a long time (larger than 30 hours) at temperature of 1200 DEG C and above.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature anti-oxidation coatings, and is especially suitable for anti-oxidation coatings during long-term heat treatment of steel and the like at high temperatures. Background technique [0002] In the manufacturing process of steel and its mechanical products, how to protect them from being oxidized or being oxidized as little as possible during high-temperature heat treatment, especially at 1200°C and above, is the goal that people are always pursuing. The free energy of steel at 1200°C and above is reduced due to the oxidation reaction process, and the reduction increases with the increase of temperature; high temperature corrosion is very serious, which not only brings a lot of waste, but also brings great difficulties to the manufacture of mechanical products . In order to avoid oxidation and corrosion in the heat treatment process of steel, in addition to selecting high-tempe...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12C09D5/00C21D1/68B05D5/00
Inventor 白敏任春媚
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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