CN110777323A - Composite treatment method for gas nitrocarburizing and post-oxidation process - Google Patents
Composite treatment method for gas nitrocarburizing and post-oxidation process Download PDFInfo
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- CN110777323A CN110777323A CN201911237477.0A CN201911237477A CN110777323A CN 110777323 A CN110777323 A CN 110777323A CN 201911237477 A CN201911237477 A CN 201911237477A CN 110777323 A CN110777323 A CN 110777323A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
Abstract
The invention discloses a gas nitrocarburizing and post-oxidizing composite treatment method, which comprises the following steps: performing gas nitrocarburizing treatment, and sequentially generating a diffusion layer and a white bright layer on the surface of the workpiece; the first stage of oxidation process: introducing mixed gas of water vapor and nitrogen, wherein the oxidation temperature is 430-450 ℃, and the oxidation time is 25-35 min; stopping introducing the water vapor, regulating the flow of nitrogen, and heating to a second-stage oxidation temperature; and (3) a second-stage oxidation process: introducing mixed gas of water vapor and nitrogen, wherein the oxidation temperature is 520-540 ℃, and the oxidation time is 10-20 min; cooling and discharging, oiling and drying the parts. In the oxidation stage, a two-stage step oxidation method is utilized to form two oxide layers on the surface of a white bright layer: the inner layer is a compact oxide layer and has excellent corrosion resistance and physical isolation; and the surface layer is a loose oxide layer, so that the subsequent oiling effect is better. The oxidation layer formed by the process can greatly improve the corrosion resistance of the part.
Description
Technical Field
The invention relates to a metal material surface modification process method, in particular to a metal material surface composite treatment process method for gas nitrocarburizing, which is applied to the technical field of metal material heat treatment.
Background
The composite treatment process of gas nitrocarburizing and post-oxidation is a novel surface modification process developed by a QPQ salt bath composite treatment process, not only can greatly improve the hardness, the wear resistance and the corrosion resistance of parts, but also overcomes a series of environmental protection problems of severe process environment, difficult treatment of waste salt and wastewater and the like during the QPQ salt bath treatment. Firstly, sequentially forming a diffusion layer and a white layer on the surface of a metal matrix through gas nitrocarburizing treatment so as to improve the hardness and the wear resistance of parts; then, carrying out steam oxidation treatment on the part to generate a layer of Fe with the thickness of 1-3 mu m on the surface of the white bright layer
3O
4And oxidizing the layer. Fe
3O
4Has high chemical stability and can obviously improve the corrosion resistance of parts.
The gas nitrocarburizing and post-oxidizing composite treatment process has been widely applied to the surface modification treatment of steel parts due to the characteristics of simple and convenient operation, no pollution, low treatment temperature and the like. However, in the oxidation production work of enterprises, a one-stage oxidation process is generally adopted: and generating an oxide layer with moderate thickness on the surface of the workpiece at a certain oxidation temperature and time. The oxidation temperature and the oxidation time are adjusted to easily meet the requirements of the thickness of the oxidation layer, but the overall corrosion resistance of the part is lower. This is because, in the case of a single-stage oxidation process, if a lower oxidation temperature (e.g., 440 ℃) is adopted, the surface oxide layer is very dense and has good physical isolation, but the subsequent oiling effect is very unfavorable, and a longer oxidation time is required for forming an oxide layer with a target thickness; if a higher oxidation temperature (such as 530 ℃) is adopted, the oxidation layer can generate great looseness, although great promotion effect is achieved on the subsequent oiling effect, the corrosion rate can be rapidly increased once the corrosion medium penetrates through the oil layer; and the moderate oxidation temperature (such as 500 ℃) is adopted, and the oxidation layer is not compact enough, and the loosening degree is not enough to promote the oiling effect.
Therefore, under the circumstances, a novel oxidation process needs to be developed, the growth rule of the oxide layer tissue is organically combined with the oxygen on the surface of the part and the subsequent oiling process, the requirement of the corrosion resistance of the oxide layer can be met, the subsequent oiling effect can be promoted, the overall corrosion resistance of the part is improved, and the technical problem to be solved urgently is solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a composite treatment method for a gas nitrocarburizing and post-oxidation process, which utilizes a two-stage oxidation method to improve the corrosion resistance of steel parts, performs the composite treatment of gas nitrocarburizing and post-oxidation to prepare a corrosion-resistant composite layer, and obviously improves the corrosion resistance of the steel parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite treatment method for gas nitrocarburizing and post-oxidation process comprises the following steps:
a. and (3) gas nitrocarburizing treatment:
performing gas nitrocarburizing treatment on the surface of a metal matrix of the workpiece, so as to sequentially generate a diffusion layer and a white and bright layer on the surface of the workpiece outwards; the gas nitrocarburizing treatment aims at generating a white bright layer and a diffusion layer with certain thickness on the surface of a workpiece, improving the hardness of the part, and determining process parameters according to the actual product requirements;
b. the first stage of oxidation process:
b, placing the workpiece subjected to the gas nitrocarburizing treatment in the step a in an oxidizing atmosphere, introducing mixed gas of water vapor and nitrogen, controlling the oxidizing temperature to be 430-450 ℃ and the oxidizing time to be 25-35 min, and performing a first stage of oxidation process to generate Fe on the surface of a white bright layer of the workpiece
3O
4An oxide layer to form a dense oxide layer;
c. and (3) heating process:
after the preparation process of the compact oxide layer is finished in the step b, stopping introducing water vapor, adjusting the nitrogen flow, and heating to the target temperature of the second-stage oxidation process;
d. the second stage oxidation process:
continuously introducing mixed gas of water vapor and nitrogen gas, and controllingThe oxidation temperature is 520-540 ℃, the oxidation time is 10-20 min, the second stage oxidation process is carried out, and Fe is generated outside the compact oxidation layer of the workpiece
3O
4An oxide layer, forming a loose oxide layer;
e. and d, after the preparation process of the loose oxide layer is finished in the step d, stopping introducing water vapor, cooling the workpiece, discharging the workpiece out of the furnace, taking the loose oxide layer as an oil coating surface layer of the part, and oiling and drying the part to obtain the part with the corrosion-resistant composite layer.
As a preferred technical scheme of the invention, when the gaseous nitrocarburizing treatment is carried out, the nitriding temperature is controlled to be not lower than 560 ℃, the nitriding time is controlled to be at least 3h, and the gas is NH
3、N
2And CO
2The mixed gas of (1).
As a preferred technical scheme, when the first-stage oxidation technological process is carried out, the oxidation temperature is controlled to be 440-450 ℃, the oxidation time is 25-30 min, the introduced gas is a mixed gas of steam and nitrogen, the flow rate is determined according to the actual hearth volume, the steam flow rate is controlled to be 1.5-2.5L/h per cubic meter of the hearth volume, and the nitrogen flow rate is 1-1.5 m per cubic meter of the hearth volume
3H is used as the reference value. As a further preferable technical scheme, when the first-stage oxidation process is carried out, the flow rate of water vapor is controlled to be 1.8-2.5L/h per cubic meter of hearth volume, and the flow rate of nitrogen is controlled to be 1.2-1.5 m per cubic meter of hearth volume
3/h。
As the preferable technical scheme of the invention, during the temperature rise process, the nitrogen flow is adjusted to be 3-5 m per cubic meter of hearth volume
3H is used as the reference value. As a further preferable technical scheme of the invention, during the temperature rise process, the nitrogen flow is adjusted to be 4-5 m per cubic meter of hearth volume
3/h。
As a preferred technical scheme, when the second-stage oxidation process is carried out, the oxidation temperature is controlled to be 530-540 ℃, the oxidation time is 10-15 min, the introduced gas is a mixed gas of steam and nitrogen, the flow rate is determined according to the actual hearth volume, the steam flow rate is controlled to be 1.5-2.5L/h per cubic meter of the hearth volume, and the nitrogen flow rate is 1-1.5 m per cubic meter of the hearth volume
3H is used as the reference value. As a further preferable technical scheme, when the second-stage oxidation process is carried out, the flow rate of water vapor is controlled to be 1.8-2.5L/h per cubic meter of hearth volume, and the flow rate of nitrogen is controlled to be 1.2-1.5 m per cubic meter of hearth volume
3/h。
As the preferable technical scheme of the invention, after the preparation process of the loose oxide layer is finished, the water vapor is stopped to be introduced in the cooling process, and the nitrogen flow is regulated to be 3-5 m per cubic meter of the hearth volume
3Cooling the workpiece to 80-180 ℃ along with the furnace, and discharging; and then in the oiling process, the oil immersion time is 3-8 min, the drying time is 2-5 min, and the drying temperature is 60-120 ℃. As a further preferable technical scheme of the invention, after the preparation process of the loose oxide layer is completed, the flow of nitrogen is adjusted to be 4-5 m per cubic meter of hearth volume
3Cooling the workpiece to 120-180 ℃ along with the furnace, and discharging; and then in the oiling process, the oil immersion time is not less than 6-8 min, the drying time is 3-5 min, and the drying temperature is 100-120 ℃.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. after gas nitrocarburizing, the method adopts a two-stage step type steam oxidation process, and firstly adopts a low oxidation temperature to form a compact oxide layer on the surface of a white bright layer; then, carrying out second-stage oxidation treatment at a higher temperature, and continuously generating a loose oxidation layer on the surface; the oxide layer with a compact inner layer has excellent corrosion resistance and physical isolation, and protects a matrix from being corroded; the oxide layer with loose surface layer can effectively promote the penetration of the anti-rust oil, fully play the anti-rust function of the anti-rust oil and further improve the corrosion resistance of the parts;
2. according to the method, the growth rule of the oxide layer structure is organically combined with the oxygen on the surface of the part and the subsequent oiling process, so that the requirement on the corrosion resistance of the oxide layer can be met, the subsequent oiling effect can be promoted, and the overall corrosion resistance of the part is improved;
3. the method has the advantages of simple process, obvious effect, easy realization and low cost.
Drawings
FIG. 1 is a photograph of a metallographic structure of an oxide layer prepared by a method according to an embodiment of the present invention.
FIG. 2 is a scanning electron microscope photograph of the surface of the oxidized layer after the first stage oxidation prepared by the method of the embodiment of the invention.
FIG. 3 is a scanning electron micrograph of the surface of the oxidized layer after the second stage of oxidation according to one embodiment of the present invention.
FIG. 4 is a comparison graph of salt spray corrosion experimental results of a part sample prepared by a method in an embodiment of the invention and a sample prepared by a conventional one-stage oxidation process.
Detailed Description
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
example one
In this embodiment, a composite treatment method of gas nitrocarburizing and post-oxidation process includes the following steps:
a. and (3) gas nitrocarburizing treatment:
performing gas nitrocarburizing treatment on the surface of a metal matrix of the workpiece, controlling the nitriding temperature to be 560 ℃, the nitriding time to be 3h, and the gas to be NH
3、N
2And CO
2Thereby sequentially generating a diffusion layer and a white layer on the surface of the workpiece; the gas nitrocarburizing treatment aims at generating a white bright layer and a diffusion layer with certain thickness on the surface of a workpiece, improving the hardness of the part, and determining process parameters according to the actual product requirements;
b. the first stage of oxidation process:
b, placing the workpiece which is subjected to the gaseous nitrocarburizing treatment in the step a in an oxidizing atmosphere of an oxidizing heat treatment furnace, introducing mixed gas of water vapor and nitrogen, controlling the oxidizing temperature to be 440 ℃, the oxidizing time to be 30min, determining the flow according to the actual hearth volume, controlling the water vapor flow to be 1.8L/h per cubic meter of the hearth volume, and controlling the nitrogen flow to be 1.2m per cubic meter of the hearth volume
3H, performing a first stage oxidation process to generate Fe on the surface of the white bright layer of the workpiece
3O
4Oxide layer is formedA dense oxidation layer;
c. and (3) heating process:
after the preparation process of the compact oxide layer is finished in the step b, stopping introducing the water vapor, and adjusting the nitrogen flow to be 4m per cubic meter of the hearth volume
3Heating to the target temperature of 530 ℃ in the second-stage oxidation process;
d. the second stage oxidation process:
continuously introducing mixed gas of water vapor and nitrogen, controlling the oxidation temperature to 530 ℃, the oxidation time to 15min, determining the flow according to the actual hearth volume, controlling the water vapor flow to be 1.8L/h per cubic meter of the hearth volume, and controlling the nitrogen flow to be 1.2m per cubic meter of the hearth volume
3H, performing a second stage of oxidation process, and continuing to generate Fe outside the compact oxide layer of the workpiece
3O
4An oxide layer, forming a loose oxide layer;
e. after the preparation process of the loose oxide layer is finished in the step d, stopping introducing water vapor, cooling the workpiece, and adjusting the nitrogen flow to be 4m per cubic meter of hearth volume
3H, cooling the workpiece to 120 ℃ along with the furnace, and discharging the workpiece; and then taking the loose oxide layer as an oil coating surface layer of the part, oiling and drying the part, controlling the oil immersion time to be 6min, the drying time to be 3min and the drying temperature to be 100 ℃, and obtaining the part with the corrosion-resistant composite layer.
Experimental test analysis:
the part with the corrosion-resistant composite layer prepared in the embodiment is subjected to experimental test analysis, and the metallographic photograph of the oxide layer shown in fig. 1 and the oxide layer formed by the two-stage oxidation method have uniform structure and average thickness of about 2.7 microns; scanning electron micrographs of the surfaces of the oxide layers in the figures 2 and 3 show that the oxide layer on the surface after the first stage of oxidation is dense, and the oxide layer on the surface after the second stage of oxidation has certain porosity; from fig. 4, it can be seen that the overall salt spray corrosion time of the sample after the secondary oxidation process is significantly higher than that of the other two conventional oxidation processes. In the method of this embodiment, a two-step oxidation heat treatment method is used in the oxidation stage to form two oxide layers on the surface of the white bright layer: the inner layer is a compact oxide layer and has excellent corrosion resistance and physical isolation; and the surface layer is a loose oxide layer, so that the subsequent oiling effect is better. The oxidation layer formed by the process can greatly improve the corrosion resistance of the part.
Example two
This embodiment is substantially the same as the first embodiment, and is characterized in that:
in this embodiment, a composite treatment method of gas nitrocarburizing and post-oxidation process includes the following steps:
a. and (3) gas nitrocarburizing treatment:
performing gas nitrocarburizing treatment on the surface of a metal matrix of the workpiece, controlling the nitriding temperature to be 560 ℃, the nitriding time to be 3h, and the gas to be NH
3、N
2And CO
2Thereby sequentially generating a diffusion layer and a white layer on the surface of the workpiece; the gas nitrocarburizing treatment aims at generating a white bright layer and a diffusion layer with certain thickness on the surface of a workpiece, improving the hardness of the part, and determining process parameters according to the actual product requirements;
b. the first stage of oxidation process:
b, placing the workpiece which is subjected to the gaseous nitrocarburizing treatment in the step a in an oxidizing atmosphere of an oxidizing heat treatment furnace, introducing mixed gas of water vapor and nitrogen, controlling the oxidizing temperature to be 450 ℃, the oxidizing time to be 25min, determining the flow according to the actual hearth volume, controlling the water vapor flow to be 2.5L/h per cubic meter of the hearth volume, and controlling the nitrogen flow to be 1.5m per cubic meter of the hearth volume
3H, performing a first stage oxidation process to generate Fe on the surface of the white bright layer of the workpiece
3O
4An oxide layer to form a dense oxide layer;
c. and (3) heating process:
after the preparation process of the compact oxide layer is finished in the step b, stopping introducing the water vapor, and adjusting the nitrogen flow to be 5m per cubic meter of the hearth volume
3Heating to the target temperature of 540 ℃ in the second stage oxidation process;
d. the second stage oxidation process:
continuously introducing mixed gas of water vapor and nitrogen, controlling the oxidation temperature at 540 deg.C, oxidation time at 10min, and flow rate according toThe actual furnace volume is determined, the steam flow is controlled to be 2.5L/h per cubic meter of the furnace volume, and the nitrogen flow is controlled to be 1.5m per cubic meter of the furnace volume
3H, performing a second stage of oxidation process, and continuing to generate Fe outside the compact oxide layer of the workpiece
3O
4An oxide layer, forming a loose oxide layer;
e. after the preparation process of the loose oxide layer is finished in the step d, stopping introducing water vapor, cooling the workpiece, and adjusting the nitrogen flow to be 5m per cubic meter of the hearth volume
3H, cooling the workpiece to 180 ℃ along with the furnace, and discharging; and then taking the loose oxide layer as an oil coating surface layer of the part, oiling and drying the part, controlling the oil immersion time to be 8min, the drying time to be 5min and the drying temperature to be 120 ℃, and obtaining the part with the corrosion-resistant composite layer.
Experimental test analysis:
the part with the corrosion-resistant composite layer prepared in the embodiment is subjected to experimental test analysis, and an oxide layer formed by a two-stage oxidation method is uniform in structure and has an average thickness of 2.7 microns; the surface oxide layer after the first stage oxidation is compact, and the surface of the oxide layer after the second stage oxidation has certain porosity; the whole salt spray corrosion time of the sample treated by the two-stage oxidation process is obviously longer than that of the other three conventional oxidation processes. In the method of this embodiment, a two-step oxidation heat treatment method is used in the oxidation stage to form two oxide layers on the surface of the white bright layer: the inner layer is a compact oxide layer and has excellent corrosion resistance and physical isolation; and the surface layer is a loose oxide layer, so that the subsequent oiling effect is better. The oxidation layer formed by the process can greatly improve the corrosion resistance of the part.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes and modifications may be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitution patterns, so long as the purpose of the present invention is met, and the technical principle and inventive concept of the composite treatment method of gas nitrocarburizing and post oxidation process of the present invention shall not be departed from the protection scope of the present invention.
Claims (10)
1. A composite treatment method for gas nitrocarburizing and post-oxidation process is characterized by comprising the following steps:
a. and (3) gas nitrocarburizing treatment:
performing gas nitrocarburizing treatment on the surface of a metal matrix of the workpiece, so as to sequentially generate a diffusion layer and a white and bright layer on the surface of the workpiece outwards;
b. the first stage of oxidation process:
b, placing the workpiece subjected to the gas nitrocarburizing treatment in the step a in an oxidizing atmosphere, introducing mixed gas of water vapor and nitrogen, controlling the oxidizing temperature to be 430-450 ℃ and the oxidizing time to be 25-35 min, and performing a first stage of oxidation process to generate Fe on the surface of a white bright layer of the workpiece
3O
4An oxide layer to form a dense oxide layer;
c. and (3) heating process:
after the preparation process of the compact oxide layer is finished in the step b, stopping introducing water vapor, adjusting the nitrogen flow, and heating to the target temperature of the second-stage oxidation process;
d. the second stage oxidation process:
continuously introducing mixed gas of water vapor and nitrogen, controlling the oxidation temperature to be 520-540 ℃ and the oxidation time to be 10-20 min, carrying out a second stage of oxidation process, and continuously generating Fe outside a compact oxide layer of the workpiece
3O
4An oxide layer, forming a loose oxide layer;
e. and d, after the preparation process of the loose oxide layer is finished in the step d, stopping introducing water vapor, cooling the workpiece, discharging the workpiece out of the furnace, taking the loose oxide layer as an oil coating surface layer of the part, and oiling and drying the part to obtain the part with the corrosion-resistant composite layer.
2. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step a, the nitriding temperature is controlled to be not lower than 560 ℃ when the gaseous nitrocarburizing treatment is carried outThe reaction time is at least 3h, and the gas is NH
3、N
2And CO
2The mixed gas of (1).
3. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step b, when the first-stage oxidation process is carried out, the oxidation temperature is controlled to be 440-450 ℃, the oxidation time is 25-30 min, the introduced gas is a mixed gas of steam and nitrogen, the flow rate is determined according to the actual hearth volume, the steam flow rate is controlled to be 1.5-2.5L/h per cubic meter of the hearth volume, and the nitrogen flow rate is 1-1.5 m per cubic meter of the hearth volume
3/h。
4. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 3, characterized in that: in the step b, when the first-stage oxidation process is carried out, the flow rate of the water vapor is controlled to be 1.8-2.5L/h per cubic meter of the volume of the hearth, and the flow rate of the nitrogen is controlled to be 1.2-1.5 m per cubic meter of the volume of the hearth
3/h。
5. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step c, during the temperature rise process, the flow of nitrogen is adjusted to be 3-5 m per cubic meter of hearth volume
3/h。
6. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 5, characterized in that: in the step c, during the temperature rise process, the flow of nitrogen is adjusted to be 4-5 m per cubic meter of hearth volume
3/h。
7. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step d, when the second-stage oxidation process is carried out, the oxidation temperature is controlled to be 530-540 ℃, the oxidation time is 10-15 min, the introduced gas is a mixed gas of water vapor and nitrogen, the flow rate is determined according to the actual furnace volume, and the flow rate of the water vapor is controlled to be every dayThe volume of the square meter hearth is 1.5-2.5L/h, and the nitrogen flow is 1-1.5 m per cubic meter hearth
3/h。
8. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 7, characterized in that: in the step d, when the second-stage oxidation process is carried out, the flow rate of the water vapor is controlled to be 1.8-2.5L/h per cubic meter of the volume of the hearth, and the flow rate of the nitrogen is controlled to be 1.2-1.5 m per cubic meter of the volume of the hearth
3/h。
9. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step e, after the preparation process of the loose oxide layer is completed, stopping water vapor introduction in the cooling process, and regulating the nitrogen flow to be 3-5 m per cubic meter of hearth volume
3Cooling the workpiece to 80-180 ℃ along with the furnace, and discharging; and then in the oiling process, the oil immersion time is 3-8 min, the drying time is 2-5 min, and the drying temperature is 60-120 ℃.
10. The combined treatment method of gas nitrocarburizing and post-oxidation process according to claim 1, characterized in that: in the step e, after the preparation process of the loose oxide layer is completed, the flow rate of nitrogen is adjusted to be 4-5 m per cubic meter of hearth volume
3Cooling the workpiece to 120-180 ℃ along with the furnace, and discharging; and then in the oiling process, the oil immersion time is not less than 6-8 min, the drying time is 3-5 min, and the drying temperature is 100-120 ℃.
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| CN113019596A (en) * | 2021-03-12 | 2021-06-25 | 靖江市永信特钢有限公司 | Composite lining plate for large-scale semi-autogenous mill and manufacturing method thereof |
| CN113804004A (en) * | 2021-08-12 | 2021-12-17 | 上海富乐华半导体科技有限公司 | Method for improving reliability of surface oxide layer of sintering furnace conveyor belt |
| CN113804004B (en) * | 2021-08-12 | 2024-03-19 | 上海富乐华半导体科技有限公司 | Method for improving reliability of oxide layer on surface of conveyor belt of sintering furnace |
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