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Preparation method forming protective film by alloy surface in-situ oxidation reaction

An in-situ oxidation and protective film technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as difficult formation and self-repairing, and achieve low cost, easy operation and improved performance Effect

Inactive Publication Date: 2012-10-10
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] (3) When Mn x Cr 3-x o 4 After the spinel oxide film is destroyed, it cannot repair itself, and it is difficult to form new Mn x Cr 3-x o 4 spinel
[0012] (4) The adjustment of oxygen partial pressure involved in the above patent can only be adjusted by the temperature of water or ammonia water, so its application has certain limitations

Method used

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  • Preparation method forming protective film by alloy surface in-situ oxidation reaction
  • Preparation method forming protective film by alloy surface in-situ oxidation reaction
  • Preparation method forming protective film by alloy surface in-situ oxidation reaction

Examples

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Embodiment 1

[0033] Example A protective film of oxidation products with a three-layer structure was prepared on the surface of HP40 alloy.

[0034] After the HP40 alloy material is treated with alkali cleaning, pickling and neutralization to remove oil and rust on the surface, it is placed in a tubular heat treatment furnace, hydrogen is used as a protective atmosphere, the gas flow rate is set to 50ml / min, and K 2 SO 4 In saturated aqueous solution, the solution temperature is 20°C. The final gas is introduced into the heat treatment furnace. Heat the heat treatment furnace to 500°C at a speed of 20°C / min, keep it for 8 hours, then heat it up to 1000°C, and keep it for 4 hours. After the heat preservation is over, cool down with the furnace, and turn off the gas after reaching 150°C.

[0035] After oxidation treatment, a three-layer oxide protective film is formed on the surface of the sample, from the outside to the inside: MnCr 2 o 4 Spinel protective layer, Cr 2 o 3 Repair laye...

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Abstract

The invention relates to a preparation method forming a protective film by an alloy surface in-situ oxidation reaction by means of precision control. The compact and stable oxide protective film of a three-layer structure is formed on the surfaces of materials by means of control of oxygen partial pressure and oxidation temperature in an oxidation atmosphere, and comprises a MnxCr3-xO4 (0.5< / =x< / =1.5) spinel layer, a chromic oxidation layer and a silicon oxidation layer from outside to inside, wherein the spinel layer mainly plays a role in protection, the chromic oxidation layer can provide Cr oxides for self repair of the spinel layer, and the silicon oxidation layer serves as a protective layer and a diffusion barrier for elements among substrates. The protective film can effectively inhibit surface oxidation, carburization or coking of the materials in service, and the service life or decoking period of the materials is prolonged.

Description

【Technical field】 [0001] The invention relates to a preparation method for precisely controlling the in-situ oxidation reaction on the surface of an alloy to form a protective film, which is suitable for alloys containing high Cr and a certain amount of Mn, especially for high-temperature gas cooling reactor gas tubes (VHTR) and reactors in nuclear reactions. Nickel-based superalloy tubes in heat exchangers such as Haynes 230, high-temperature cracking furnace tubes in ethylene plants such as HP40, connector materials in solid fuel cells (SOFC) Fe-Cr-Mn alloys, etc. 【Background technique】 [0002] In high temperature oxidation environment, dense NiO, Cr 2 o 3 Oxide film has excellent high temperature oxidation corrosion resistance. As a VHTR structural material, the nickel-based superalloy has a working temperature of 1000°C, a pressure of 9MPa, and a design life of up to 60 years. In the high temperature environment of VHTR, these materials are exposed to CO, CO 2 、H 2...

Claims

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Application Information

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IPC IPC(8): C23C8/10
Inventor 刘京雷颜磊徐宏叶先勇王志远
Owner EAST CHINA UNIV OF SCI & TECH
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