CN114892125A - Preparation method of PN-Al composite infiltration layer on surface of 40Cr steel - Google Patents
Preparation method of PN-Al composite infiltration layer on surface of 40Cr steel Download PDFInfo
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- CN114892125A CN114892125A CN202210574665.8A CN202210574665A CN114892125A CN 114892125 A CN114892125 A CN 114892125A CN 202210574665 A CN202210574665 A CN 202210574665A CN 114892125 A CN114892125 A CN 114892125A
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- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 230000008595 infiltration Effects 0.000 title claims abstract description 20
- 238000001764 infiltration Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000005121 nitriding Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 238000005488 sandblasting Methods 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 abstract 1
- 235000019270 ammonium chloride Nutrition 0.000 abstract 1
- 239000011812 mixed powder Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 17
- 238000005269 aluminizing Methods 0.000 description 10
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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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
- C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to a preparation method of a PN-Al composite infiltration layer on the surface of 40Cr steel, which comprises the following steps: firstly, preparing a nitrided layer (PN layer for short) on the surface of 40Cr steel by adopting ion Nitriding; second step, embedding the 40Cr after ion nitriding treatment into Al powder, Zn powder and Al 2 O 3 Heating the mixed powder of the powder and NH4Cl powder to 530 ℃ in a vacuum atmosphere rotary furnace, preserving heat for 4 hours, and physically removing embedded powder to obtain a PN-Al composite infiltration layer on the surface of 40Cr steel.
Description
Technical Field
The invention relates to a preparation method of a PN-Al composite infiltration layer on the surface of 40Cr steel.
Technical Field
40Cr steel is one of the most widely used medium carbon alloy steels in the machine manufacturing industry, and is commonly used for manufacturing workpieces such as machine tool worms, spline shafts, gears, tip sleeves, shafts and the like. When the workpiece bears load and medium action for a long time, corrosion failure is easy to occur. Ion nitriding and low temperature pack aluminizing are common low temperature corrosion resistant carburized layer treatment techniques for carbon steel. The hardness of the nitriding layer to the carbon steel is obviously improved, but the nitriding layer is thin, the surface brittleness is high, and the corrosion resistance is insufficient; the aluminized layer can obviously improve the corrosion resistance of the carbon steel, but the aluminized layer has lower hardness, and the interface bonding of the aluminized layer and the carbon steel substrate is not uniform. Therefore, a single nitriding layer and a single aluminizing layer cannot meet the performance requirement of corrosion resistance of the carbon steel part under a complex working condition environment.
Firstly, permeating nitrogen element on the surface of a steel matrix by using ion nitriding to generate a PN layer; and then, by means of the strong affinity of Al and N, Al element is infiltrated in the PN layer by adopting low-temperature embedding aluminizing to generate the PN-Al composite infiltrated layer. The thickness of the PN-Al composite infiltration layer is increased, and the hardness is distributed in a gradient way. The corrosion weight loss of the PN-Al composite infiltration layer 40Cr is reduced by 37.6 percent compared with that of the single Al layer 40Cr and is reduced by 62.6 percent compared with that of the single PN layer 40Cr, and the PN-Al composite infiltration layer has excellent corrosion resistance.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of a PN-Al composite infiltration layer capable of improving the corrosion resistance of 40Cr steel.
The implementation of the invention comprises the following steps:
s1, preparing a PN layer on the surface of the 40Cr layer by ion nitriding;
s2, preparing an Al layer on the 40Cr processed in the step S1 by a low-temperature embedding aluminizing method;
s3, physically removing the embedded powder in the step S2 to obtain the 40Cr steel PN-Al composite infiltration layer.
The process parameters of the step S1 are as follows: putting the pretreated 40Cr workpiece into an ion nitriding furnace, wherein the nitriding temperature is 510 ℃, and the nitriding time is 6 hours; the working gas being NH 3 The working pressure is 650Pa, the working voltage is 650V, and the working current is 80-90A.
The process parameters of the step S2 are as follows: the aluminizing temperature is 530 ℃, and the aluminizing time is 2 hours; the components and contents (mass percentage) of the penetrating agent are as follows: metal source Al powder (60-80%, 150 mesh), Zn powder (38.8 wt.%, 150 mesh), activator NH 4 Cl (1-5%), filler Al 2 O 3 (the balance, 150 mesh).
Compared with the prior art, the sample preparation method has the following advantages: the thickness of the PN-Al composite infiltration layer is about 50 mu m, and the hardness of the infiltration layer is in gradient distribution; compared with a single PN layer and a single Al layer, the PN-Al composite permeation layer has more excellent corrosion resistance.
Drawings
FIG. 1 is an X-ray diffraction pattern of the surface of a PN-Al composite infiltration layer on the surface of 40Cr steel.
FIG. 2 is a field emission scanning electron microscope image of the PN-Al composite infiltrated layer on the surface of 40Cr steel.
FIG. 3 is a field emission scanning electron microscope image of a PN-Al composite infiltrated layer of a 40Cr steel section.
FIG. 4 is a hardness distribution curve of the PN-Al composite carburized layer on the surface of the 40Cr steel prepared by the embodiment of the invention.
FIG. 5 is a statistical chart of salt spray corrosion 60 h weight loss rate of PN-Al composite infiltrated 40Cr steel, ion infiltrated single PN layer 40Cr steel and embedded infiltrated single Al layer prepared by the embodiment of the invention.
Detailed Description
For a better understanding of the present invention, the technical solutions of the present invention will be further described with reference to the accompanying drawings and detailed description.
The implementation of the invention comprises the following steps:
s1, preparing a PN layer on the surface of the 40Cr layer by ion nitriding;
s2, preparing an Al layer on the 40Cr processed in the step S1 by a low-temperature embedding aluminizing method;
s3, physically removing the embedded powder in the step S2 to obtain the 40Cr steel PN-Al composite infiltration layer.
The process parameters of the step S1 are as follows: putting the pretreated 40Cr workpiece into an ion nitriding furnace, wherein the nitriding temperature is 510 ℃, and the nitriding time is 6 hours; the working gas being NH 3 The working pressure is 650Pa, the working voltage is 650V, and the working current is 80-90A.
The process parameters of the step S2 are as follows: the aluminizing temperature is 530 ℃, and the aluminizing time is 2 hours; the components and contents (mass percentage) of the penetrating agent are as follows: metal source Al powder (60-80%, 150 mesh), Zn powder (38.8 wt.%, 150 mesh), activator NH 4 Cl (1-5%), filler Al 2 O 3 (the remainder, 150 mesh).
The PN-Al composite infiltrated layer implemented by the invention combines the process characteristics of the ion infiltrated PN layer and the low-temperature embedded infiltrated Al layer, realizes the gradient distribution of the hardness of the PN-Al composite infiltrated layer by improving the compactness of the infiltrated layer appearance and the continuity of the thickness, and further improves the corrosion resistance of the carbon steel substrate.
FIG. 1 is an XRD pattern of a PN-Al composite carburized layer prepared according to an embodiment of the present invention, and a diffraction peak position of a sample is consistent with an AlN peak position, which shows that the carburized layer subjected to the composite treatment is different from an Fe-N compound of the carburized layer and from an Fe-Al compound after the aluminizing treatment. FIG. 2 is a field emission scanning electron microscope image of the surface of the PN-Al composite infiltrated layer prepared by the embodiment of the invention, which shows that the surface of the PN-Al composite infiltrated layer is dense and no obvious crack is found. FIG. 3 is a field emission scanning electron microscope image of a PN-Al composite infiltrated layer cross section prepared by the embodiment of the invention, which shows that the PN-Al composite infiltrated layer is continuous and uniform in thickness, and the thickness is about 50 μm.
And measuring the hardness distribution of the PN-Al composite infiltrated layer along the depth direction by adopting a microhardness meter, wherein the measuring load is 9.8N, and the pressure maintaining time is 10S. Fig. 4 is a hardness distribution curve of the PN-Al composite infiltrated layer prepared by the embodiment of the invention, and it can be seen from fig. 4 that the hardness of the PN-Al composite infiltrated layer has a slow gradient distribution characteristic.
And (3) characterizing the corrosion resistance of the PN-Al composite permeable layer through neutral salt spray corrosion. Weighing the mass of 40Cr after PN-Al composite infiltration, single ion infiltration PN and single embedding infiltration Al by using an electronic balance with the precision of 0.1mg, placing the weighed mass in a neutral salt spray corrosion tester containing 5% NaCl after weighing, wherein the corrosion temperature is 25 ℃, the salt spray amount is 2.5 mL/h, continuously spraying and corroding for 60 h, and then weighing again. FIG. 5 shows the weight loss rate statistics of PN-Al composite infiltrated layer prepared according to the embodiments of the present invention. As can be seen from FIG. 4, the corrosion weight loss of the PN-Al composite infiltrated layer 40Cr is reduced by 37.6% compared with the single Al layer 40Cr and by 62.6% compared with the single PN layer 40Cr, indicating that the prepared PN-Al composite infiltrated layer has excellent corrosion resistance.
Claims (2)
1. A preparation method of a PN-Al composite infiltration layer on the surface of 40Cr steel comprises the following steps: firstly, hanging 40Cr steel subjected to rust removal, oil removal and sand blasting cleaning in an ion nitriding furnace, wherein the total pressure of ammonia gas in the furnace is 650Pa, the nitriding voltage is adjusted to 650V, the nitriding temperature is 510 ℃, and nitriding is continuously carried out for 6 hours; secondly, the embedding powder is weighed according to the proportion of Al powder (65-70 wt.%), Zn powder (28-31 wt.%), Al 2 O 3 Powder (1.5-2 wt.%) is ground in ball mill and mixed with NH 4 Cl powder (0.5-1.5 wt.%), embedding the powder in a stainless steel sealed tank, heating to 530 deg.C in a vacuum rotary furnace, keeping the temperature for 4h, and removing the embedded powder to obtain a PN-Al composite infiltration layer on the surface of the 40Cr steel.
2. The PN-Al composite infiltration layer on the surface of 40Cr steel, which is characterized by being prepared by the method in claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210574665.8A CN114892125A (en) | 2022-05-25 | 2022-05-25 | Preparation method of PN-Al composite infiltration layer on surface of 40Cr steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210574665.8A CN114892125A (en) | 2022-05-25 | 2022-05-25 | Preparation method of PN-Al composite infiltration layer on surface of 40Cr steel |
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| CN114892125A true CN114892125A (en) | 2022-08-12 |
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| CN202210574665.8A Pending CN114892125A (en) | 2022-05-25 | 2022-05-25 | Preparation method of PN-Al composite infiltration layer on surface of 40Cr steel |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428454A (en) * | 2001-12-22 | 2003-07-09 | 中国石油乌鲁木齐石油化工总厂 | Zinc-aluminium embedding co-permeating method for iron and steel products and its permeating agent |
| CN101974728A (en) * | 2010-11-10 | 2011-02-16 | 武汉苏泊尔炊具有限公司 | Aluminizing process for iron pan |
| JP2012001788A (en) * | 2010-06-18 | 2012-01-05 | Chubu Electric Power Co Inc | Surface nitriding method for aluminum base material |
| CN105525255A (en) * | 2015-12-17 | 2016-04-27 | 常州大学 | Fast and efficient aluminum-silicon-nitrogen composite permeating technology for steel |
| US20170283934A1 (en) * | 2014-10-07 | 2017-10-05 | Air Water Nv Inc. | Method for altering surface of metal, and metallic product |
| CN108277487A (en) * | 2017-12-26 | 2018-07-13 | 合肥市新开创不锈钢设备有限公司 | A kind of process of surface treatment of stainless steel |
| CN109913796A (en) * | 2019-03-29 | 2019-06-21 | 长安大学 | TiAlN composite coating on surface of titanium alloy and preparation method thereof |
| CN113005395A (en) * | 2019-12-20 | 2021-06-22 | 中核建中核燃料元件有限公司 | Chromizing and nitriding surface treatment process for austenitic stainless steel |
-
2022
- 2022-05-25 CN CN202210574665.8A patent/CN114892125A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428454A (en) * | 2001-12-22 | 2003-07-09 | 中国石油乌鲁木齐石油化工总厂 | Zinc-aluminium embedding co-permeating method for iron and steel products and its permeating agent |
| JP2012001788A (en) * | 2010-06-18 | 2012-01-05 | Chubu Electric Power Co Inc | Surface nitriding method for aluminum base material |
| CN101974728A (en) * | 2010-11-10 | 2011-02-16 | 武汉苏泊尔炊具有限公司 | Aluminizing process for iron pan |
| US20170283934A1 (en) * | 2014-10-07 | 2017-10-05 | Air Water Nv Inc. | Method for altering surface of metal, and metallic product |
| CN105525255A (en) * | 2015-12-17 | 2016-04-27 | 常州大学 | Fast and efficient aluminum-silicon-nitrogen composite permeating technology for steel |
| CN108277487A (en) * | 2017-12-26 | 2018-07-13 | 合肥市新开创不锈钢设备有限公司 | A kind of process of surface treatment of stainless steel |
| CN109913796A (en) * | 2019-03-29 | 2019-06-21 | 长安大学 | TiAlN composite coating on surface of titanium alloy and preparation method thereof |
| CN113005395A (en) * | 2019-12-20 | 2021-06-22 | 中核建中核燃料元件有限公司 | Chromizing and nitriding surface treatment process for austenitic stainless steel |
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Application publication date: 20220812 |