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Surface treatment agent for low-temperature salt bath nitrocarburizing technology and use method thereof

A surface treatment agent, nitrogen, carbon and oxygen technology, which is applied in the field of metal materials to improve wear resistance and corrosion resistance, can solve the problems of stainless steel that cannot meet the tempering temperature, corrosion resistance decline, etc., to achieve corrosion resistance and corrosion resistance Fatigue performance improvement, wide application value, and the effect of widening the application range

Pending Publication Date: 2020-04-17
CHENGDU SURFACE METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problem that carbonitriding technology at high temperature cannot meet the requirements of metal material workpieces with lower tempering temperature, the present invention provides a surface treatment agent for low temperature salt bath nitrogencarburizing technology and its application method. The working temperature of co-infiltration is 420-480℃, which improves the wear resistance, corrosion resistance and fatigue resistance of metal materials, and solves the problem that carbon-nitrogen-oxygen co-infiltration technology at high temperature cannot meet the requirements of metal material workpieces and stainless steel with lower tempering temperature. The corrosion resistance of this type of metal after carbonitriding treatment is seriously reduced, and it has wide applicability in the field of surface treatment of metal materials.

Method used

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  • Surface treatment agent for low-temperature salt bath nitrocarburizing technology and use method thereof
  • Surface treatment agent for low-temperature salt bath nitrocarburizing technology and use method thereof
  • Surface treatment agent for low-temperature salt bath nitrocarburizing technology and use method thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: The use method of low-temperature salt bath nitrocarburizing

[0031] See attached figure 1 It can be seen that in the 45# low-temperature salt bath nitrocarburizing process, the 45# workpiece is cleaned in an alkaline cleaning solution for 5 minutes to remove grease, the cleaning temperature is 70°C, and then rinsed in clean water at room temperature; after drying, enter the preheating process. In the furnace, preheat at 350°C for 30 minutes, put it into a nitrocarburized salt bath at 460°C for 240 minutes, take it out, cool it in air for 1 minute, and wash it at room temperature for 10 minutes. The surface treatment agent components are: KCNO 235g, NaCNO 400g, K 2 CO 3 205g, KCl 155g, Li 2 CO 3 45g, Ce 2 (CO 3 ) 3 25g, La 2 (CO 3 ) 3 25g.

[0032] After nitrocarburizing technology, the surface hardness is 340 (HV0.3), the carburized layer: 0.126mm, and the compound layer depth: 5µm.

Embodiment 2

[0033] Embodiment 2: The use example of the salt bath nitrocarburizing surface treatment agent of the present invention

[0034] See attached figure 2 It can be seen that the material of the workpiece is 30SiMn2MoVA, the service condition is 460℃×240min, CNO - The concentration is 39.9%, through the air. After nitrocarburizing salt bath treatment, the surface hardness is 715 (HV0.3), the seepage layer is 0.15mm, and the compound layer depth is 4μm. The surface treatment agent components are KCNO 60g, NaCNO290g, K 2 CO 3 160g, KCl165g, Li 2 CO 3 6g.

Embodiment 3

[0035] Embodiment 3: Example of using the salt bath nitrocarburizing surface treatment agent of the present invention

[0036] See attached image 3 It can be seen that the workpiece material is 45CrNiMoA, the service condition is 450℃×240min, CNO - The concentration is 36%, through the air. After nitrocarburizing technology, the surface hardness is 730 (HV0.3), the carburized layer is 0.136mm, and the compound layer depth is 5.5μm. The surface treatment agent components are: KCNO 400g, NaCNO 500g, K 2 CO 3 250g, KCl 160g, Li 2 CO 3 80g, CE 2 (CO 3 ) 3 50g, La 2 (CO 3 ) 3 50g.

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Abstract

The invention discloses a surface treatment agent for a low-temperature salt bath nitrocarburizing technology and a use method thereof. Besides a basic formula, KCl, Li2CO3, Ce2(CO3)3 and La2(CO3)3 are added in components of the surface treatment agent, wherein the mass ratio of KCL to K2CO3 is 0.2-1, the mass ratio of Li2CO3 to K2CO3 mass ratio is 0.04-0.5, the amount of Ce2(CO3)3 is 0-5 parts, and the amount of La2(CO3)3 is 0-5 parts. By adopting the surface treatment agent, the operating temperature for nitrocarburizing is 420-480 DEG C which is far lower than the working temperature of thecurrent nitrocarburizing technology, the wear resistance, the corrosion resistance and the fatigue resistance of a metal material are greatly improved while the performance of the metal material is not sacrificed, and the problem that corrosion resistance of metal workpieces and stainless steel subjected to the carbonitriding treatment is seriously reduced since the carbonitriding technology at high temperature cannot be used for the metal workpieces and stainless steel with lower tempering temperature is solved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a process for improving wear resistance and corrosion resistance of metal materials. Background technique [0002] Salt bath nitrocarburizing technology is a method of infiltrating the surface of metal materials through salt bath, mainly nitrogen to form Fe-N compounds, and at the same time, accompanied by a small amount of carbon infiltration to form Fe-C compounds and oxygen compounds, so as to improve the surface properties of metal materials. . Salt bath nitrocarburizing technology is currently mainly used in automobiles, petrochemicals, molds, textiles, aerospace and other fields, and its application in military industry is also expanding. The treatment temperature of commonly used nitrocarburizing technology is 500-580°C. For metal materials with low tempering resistance, salt bath heat treatment at this temperature will reduce the hardness of the cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/52
CPCC23C8/52
Inventor 薛雯娟周卫宁王正东彭杰
Owner CHENGDU SURFACE METAL TECH