Surface treatment method for nitriding, oxidizing and then reducing metal

A technology of surface treatment and oxidation treatment, applied in the field of oxidation and then reduction surface treatment and metal nitridation, it can solve the problems of uneven surface color, poor corrosion resistance and high content of the oxide layer, and achieves low oxidation-reduction treatment temperature and improved resistance. Corrosion, the effect of improving corrosion resistance

Pending Publication Date: 2022-07-01
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are uneven color on the surface of the oxide layer, Fe 2 o 3 Disadvantages of high content and poor corrosion resistance

Method used

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  • Surface treatment method for nitriding, oxidizing and then reducing metal
  • Surface treatment method for nitriding, oxidizing and then reducing metal
  • Surface treatment method for nitriding, oxidizing and then reducing metal

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Preferred embodiment 1 of the present invention provides a metal nitridation-oxidation-reduction surface treatment method, the treated metal sample is DT4C pure iron, and the method includes the following steps:

[0067] S1 polishes the surface of the sample to make the surface roughness Ra 0.2μm;

[0068] S2 uses anhydrous ethanol for degreasing treatment of the polished sample;

[0069] S3 put the DT4C pure iron sample into the gas nitriding furnace and pass ammonia gas for nitriding treatment. The process parameters of nitriding treatment are: heating rate 10°C / min, nitriding temperature 530°C, nitriding time 10h, then furnace cooling to 200°C and air cooling to room temperature. During the nitriding treatment, the ammonia gas flow was controlled to be 60ml / min, the hydrogen analyzer was turned on at the same time, the ammonia gas decomposition rate was detected, and the ammonia gas decomposition rate in the furnace was controlled to be 35-45%.

[0070] S4 Put the ...

Embodiment 2

[0074] Preferred embodiment 2 of the present invention provides a metal nitridation-oxidation-reduction surface treatment method, the treated metal sample is DT4C pure iron, and the method includes the following steps:

[0075] S1 polishes the surface of the sample to make the surface roughness Ra 0.2μm;

[0076] S2 uses anhydrous ethanol for degreasing treatment of the polished sample;

[0077] S3 put the DT4C pure iron sample into the gas nitriding furnace and pass ammonia gas for nitriding treatment. The process parameters of nitriding treatment are: heating rate 10°C / min, nitriding temperature 530°C, nitriding time 10h, then furnace cooling to 200°C and air cooling to room temperature. During the nitriding treatment, the ammonia gas flow was controlled to be 60ml / min, the hydrogen analyzer was turned on at the same time, the ammonia gas decomposition rate was detected, and the ammonia gas decomposition rate in the furnace was controlled to be 35-45%.

[0078] S4 Put the ...

Embodiment 3

[0082] The preferred embodiment 3 of the present invention provides a metal nitridation-oxidation-reduction surface treatment method, the treated metal sample is DT4C pure iron, and the method includes the following steps:

[0083] S1 polishes the surface of the sample to make the surface roughness Ra 0.2μm;

[0084] S2 uses anhydrous ethanol for degreasing treatment of the polished sample;

[0085] S3 put the DT4C pure iron sample into the gas nitriding furnace and pass ammonia gas for nitriding treatment. The process parameters of nitriding treatment are: heating rate 10°C / min, nitriding temperature 530°C, nitriding time 10h, then furnace cooling to 200°C and air cooling to room temperature. During the nitriding treatment, the ammonia gas flow was controlled to be 60ml / min, the hydrogen analyzer was turned on at the same time, the ammonia gas decomposition rate was detected, and the ammonia gas decomposition rate in the furnace was controlled to be 35-45%.

[0086] S4 put ...

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Abstract

The invention provides a surface treatment method for nitriding, oxidizing and then reducing metal. The surface treatment method comprises the following steps: S1, carrying out surface gas nitriding treatment on a workpiece; s2, carrying out surface gas oxidation treatment after gas nitriding treatment; and S3, carrying out surface gas reduction treatment after oxidation treatment. According to the method, the surface reduction treatment process is added after the surface nitriding oxidation treatment, Fe2O3 can obtain electrons in the reducing atmosphere treatment process and is reduced into Fe3O4, then it is guaranteed that a Fe3O4 oxidation layer of a single phase is formed, the neutral salt spray test resistance of the treated workpiece can reach 96 h or above, and the service life of the workpiece is prolonged. The technology can be used as an alternative technology of electroplating and QPQ technologies, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a surface treatment method of metal nitridation, oxidation and reduction. Background technique [0002] With the rapid development of intelligent manufacturing and precision manufacturing, the requirements for wear resistance and corrosion resistance of metal parts are getting higher and higher. When the service environment is relatively harsh, the surface of metal parts needs to have strong wear resistance and corrosion resistance. At present, electroplating treatment is generally used, such as chrome plating and nickel plating. The utilization rate of metal raw materials in the electroplating process is low, the loss of materials is large, and the waste of resources is serious. For example, the utilization rate of chromic acid, the main raw material for chrome electroplating, is extremely low, of which the utilization rate of decorative chrome materials is onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C23C8/10C23C8/80
CPCC23C8/26C23C8/10C23C8/80
Inventor 孙金全李福杰赫庆坤薛彦鹏王鹏宇仲崇阳高钰超李浩田谢鲲李文生
Owner SHANDONG UNIV OF SCI & TECH
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