WO2019205114A1 - Cast iron cookware and method for treating surface thereof - Google Patents

Cast iron cookware and method for treating surface thereof Download PDF

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Publication number
WO2019205114A1
WO2019205114A1 PCT/CN2018/084973 CN2018084973W WO2019205114A1 WO 2019205114 A1 WO2019205114 A1 WO 2019205114A1 CN 2018084973 W CN2018084973 W CN 2018084973W WO 2019205114 A1 WO2019205114 A1 WO 2019205114A1
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WO
WIPO (PCT)
Prior art keywords
cast iron
iron cookware
nitrogen
nitrocarburizing
cookware
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PCT/CN2018/084973
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French (fr)
Chinese (zh)
Inventor
杨志文
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邢台三厦铸铁有限公司
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Priority to PCT/CN2018/084973 priority Critical patent/WO2019205114A1/en
Publication of WO2019205114A1 publication Critical patent/WO2019205114A1/en

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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
    • C23C8/28—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 one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • 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
    • C23C8/80—After-treatment

Definitions

  • the invention relates to a method for surface treatment of cast iron cookware and a cast iron cookware.
  • Cookware is closely related to people's lives, and cast iron cookware is one of the most common and traditional cookware.
  • cast iron cookware tends to rust when air and water are present at the same time, causing the surface to scale, which seriously affects the appearance and service life.
  • the surface of the cast iron cookware is usually treated by a person skilled in the art.
  • a common method is spraying the vegetable oil on the surface of the cast iron cookware, but the cast iron product of the spray coated coating has a thin coating and is prone to rust in a short time when water is encountered.
  • the product life cycle is greatly shortened, and the appearance quality is degraded.
  • the object of the present invention is to provide a method for surface treatment of a cast iron cookware, and the treated cookware can better solve the technical problem that the cast iron cookware is easily rusted by water.
  • the present invention provides the following technical solutions:
  • the invention provides a method for surface treatment of a cast iron cookware, comprising:
  • the cast iron cookware is placed in a heat treatment device for nitrocarburizing treatment; the nitrocarburizing temperature is 500-700 ° C for 5-7 h; the nitriding agent used for the nitrocarburizing includes ammonia gas 65 wt % ⁇ 80wt%, nitrogen 15wt% ⁇ 30wt%, carbon-containing gas 4wt% ⁇ 6wt%; nitrocarburizing atmosphere: active nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide Hydrogen and water vapor; the thickness of the surface of the cast iron cookware is 10-20 ⁇ m.
  • the heat treatment equipment is a well type heat treatment furnace, a box type heat treatment furnace, a vacuum heat treatment furnace, a salt bath furnace or a continuous push tray type soft nitriding heat treatment production line.
  • the cast iron cookware is subjected to surface removal of oil stains and rust removal before being placed in the heat treatment apparatus.
  • cooling is performed.
  • the cast iron cookware is subjected to nitrocarburizing treatment and cooled, and then subjected to a surface vegetable oil coating process.
  • the present invention also provides a cast iron cookware which is treated by the surface treatment of the cast iron cookware.
  • the invention improves the internal structural stability of the cast iron cookware by nitrocarburizing treatment of the cast iron cookware, increases the toughness of the cast iron cookware, makes the cookware not deform and cracks, and further improves the physical properties; and the seepage layer covers the surface of the cast iron cookware,
  • the cast iron cookware has good anti-oxidation and anti-rust functions, and can solve the technical problem that the cast iron cookware is easy to rust when exposed to water.
  • the invention discloses a method for surface treatment of cast iron cookware and a cast iron cookware, and those skilled in the art can learn from the contents of the paper and appropriately improve the process parameters. It is to be understood that such alternatives and modifications are obvious to those skilled in the art and are considered to be included in the present invention.
  • the method and the present invention have been described by the preferred embodiments, and it is obvious that the method and application described herein may be modified or appropriately modified and combined without departing from the spirit and scope of the invention. The technique of the present invention is applied.
  • the invention provides a method for surface treatment of a cast iron cookware, comprising:
  • the cast iron cookware is placed in a heat treatment equipment for nitrocarburizing treatment; the temperature of nitrocarburizing is 500-700 ° C for 5-7 h; and the nitriding agent used for nitrocarburizing includes 65 wt% of ammonia gas ⁇ 80 wt%, nitrogen 15 wt% to 30 wt%, carbon-containing gas 4 wt% to 6 wt%; nitrocarburizing atmosphere: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen And water vapor; the surface of the cast iron cookware has a thickness of 10 to 20 ⁇ m.
  • the invention improves the internal structural stability of the cast iron cookware by nitrocarburizing treatment of the cast iron cookware, increases the toughness of the cast iron cookware, makes the cookware not deform and cracks, and further improves the physical properties; and the seepage layer covers the surface of the cast iron cookware,
  • the cast iron cookware has good anti-oxidation and anti-rust functions, and can solve the technical problem that the cast iron cookware is easy to rust when exposed to water.
  • the temperature of nitrocarburizing is 500 to 700 ° C, and the temperature of nitrocarburizing in the embodiment of the present invention is 530 to 700 ° C. In other examples, the temperature of nitrocarburizing is changed. It is 540 to 680 °C.
  • the time of nitrocarburizing is 5 to 7 hours.
  • the osmotic agent used for nitrocarburizing includes 65 wt% to 80 wt% of ammonia gas, 15 wt% to 30 wt% of nitrogen gas, and 4 wt% to 6 wt% of carbonaceous gas.
  • the above-mentioned osmotic agent can be well adsorbed on the surface of the cast iron cookware, and the formed permeable layer has good wear resistance and corrosion resistance, so that the problem that the cast iron cookware is easily rusted by water can be solved.
  • the infiltrant includes 65 wt% to 80 wt% of ammonia gas; in the embodiment of the present invention, the infiltrant includes 70 wt% to 75 wt% of ammonia gas.
  • 15% by weight to 30% by weight of nitrogen is included in the osmotic agent; in the embodiment of the present invention, 20% by weight to 25% by weight of nitrogen is included in the osmotic agent.
  • 4% by weight to 6% by weight of the carbon-containing gas is included in the osmotic agent; in the embodiment of the present invention, 5% by weight to 6% by weight of the carbon-containing gas is included in the osmotic agent.
  • the carbonaceous gas is CO, CO 2 , CH 4 or C 2 H 2 .
  • the heat treatment equipment is a well type heat treatment furnace, a box type heat treatment furnace, a vacuum heat treatment furnace, a salt bath furnace or a continuous push-plate type soft nitriding heat treatment production line.
  • the cast iron cookware is subjected to surface removal of oil stains and rust removal prior to placement in the heat treatment apparatus; in other implementations, the surface roughness of the cast iron cookware surface after removal of oil and rust is greater than 1.6 ⁇ m.
  • cooling is carried out in air; in other embodiments, after nitrocarburizing treatment, cooling is carried out in air or water.
  • the present invention also provides a cast iron cookware which is subjected to the above-described method of surface treatment of a cast iron cookware.
  • the surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.6 ⁇ m.
  • the cast iron cookware was placed in a well type heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing was 530 ° C, and the time was 6 h.
  • the nitriding agent used for nitrocarburizing includes 73wt% ammonia gas, 22wt% nitrogen gas, and 5wt% carbonaceous gas; the carbonizing atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitric oxide Nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a 13 ⁇ m thick layer; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.7 ⁇ m.
  • the cast iron cookware was placed in a box heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing was 680 ° C for 5 h.
  • the nitriding agent used for nitrocarburizing includes 65 wt% ammonia gas, 30% wt nitrogen gas, and 5 wt% carbon-containing gas; the carbon osmosis atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, and mono-oxidation. Nitrogen, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a layer having a thickness of 14 ⁇ m; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware is degreased and derusted, so that the surface roughness of the cast iron is 2.1 ⁇ m; then the cast iron cookware is placed in a vacuum heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing is 700 ° C, the time is 6 h;
  • the nitriding agent used for nitrocarburizing includes 80 wt% ammonia gas, 15 wt% nitrogen gas, and 5 wt% carbon-containing gas; the carbon permeable atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitrogen monoxide, Nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a layer having a thickness of 16 ⁇ m; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.8 ⁇ m.
  • the cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 580 °C.
  • the nitriding agent used for nitrocarburizing includes 76wt% ammonia gas, 20wt% nitrogen gas, 4wt% carbon-containing gas; carbonitriding atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide Nitric oxide, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a thickness of 17 ⁇ m; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.9 ⁇ m.
  • the cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 540.
  • the time is 5h;
  • the osmotic agent used in nitrocarburizing includes 70wt% ammonia gas, 25wt% nitrogen gas, and 5wt% carbon-containing gas;
  • the carbonizing atmosphere is: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, Carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen and water vapor;
  • the surface of the cast iron cookware is formed into a thickness of 17 ⁇ m; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 2.0 ⁇ m.
  • the cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 650.
  • the time is 6h;
  • the nitriding agent used for nitrocarburizing includes 75wt% ammonia gas, 20wt% nitrogen gas, and 5wt% carbon-containing gas;
  • the carbon osmosis atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, Carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen and water vapor;
  • the surface of the cast iron cookware is formed into a thickness of 16 ⁇ m; and then cooled in air to carry out a vegetable oil coating process.
  • the surface of the cast iron cookware is degreased and derusted, so that the surface roughness of the cast iron is 1.8 ⁇ m; then the cast iron cookware is placed in the continuous push-type soft nitriding heat treatment production line for nitrocarburizing treatment; the temperature of nitrocarburizing is 500.
  • nitriding agent used in nitrocarburizing includes 74wt% ammonia gas, 20wt% nitrogen gas, 6wt% carbon-containing gas; carbonitriding atmosphere is: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide Nitric oxide, nitrogen dioxide, hydrogen and water vapor; forming a layer of 15 ⁇ m thick on the surface of the cast iron cookware; and then cooling in air to carry out a vegetable oil coating process.
  • the cast iron cookware manufactured in Examples 1 to 7 was subjected to a salt spray test for 6 h to 8 h, and the corrosion grade was 6 grade.
  • the hardness test is to test the hardness of the sample with a microhardness tester, and the load is 200 g, and the hardness test is performed by going from the layer to the cast iron direction perpendicular to the surface of the layer.
  • the wear amount is tested on the vertical universal friction tester.
  • the upper test piece material is high speed steel, the hardness is HRC63, the lower test piece base material is gray cast iron, the hardness is HB220, and the examples 1 to 4 respectively.
  • the cast iron cookware produced is subjected to surface hardness treatment.
  • the load is 200N, the mineral oil 56EP is lubricated with oil, the rotation speed is 1000r/min, continuous operation for 3h, and the test is carried out under normal temperature and normal pressure.
  • the corrosion resistance was measured as a percentage of the weight-to-corrosion weight reduction of the cast iron cookware manufactured in Examples 1 to 4 after boiling for 2 hours with 2 wt% sulfuric acid (or 10 wt% sodium hydroxide solution).
  • Example 1 336 0.09 1.3
  • Example 2 339 0.08 1.2
  • Example 3 328 0.10 1.9
  • Example 4 331 0.08 1.5
  • Example 5 336 0.09 1.5
  • Example 6 334 0.10 1.6

Abstract

A method for treating the surface of cast iron cookware, comprising: putting the cast iron cookware into thermal treatment equipment and carrying out nitrocarburization at 500-700°C for 5-7h, wherein a permeating agent employed during the nitrocarburization comprises 65-80wt% of ammonia, 15-30wt% of nitrogen and 4-6wt% of carbon-containing gas; the nitrocarburization atmosphere contains: activated nitrogen, activated carbon, ammonia, nitrogen, carbon oxide, carbon dioxide, nitrogen oxide, nitrogen dioxide, hydrogen and water vapor. The thickness of a permeating layer on the surface of the cast iron cookware is 10-20μm. Also disclosed is the cast iron cookware.

Description

对铸铁炊具进行表面处理的方法及铸铁炊具Method for surface treatment of cast iron cookware and cast iron cookware 技术领域Technical field
本发明涉及一种对铸铁炊具进行表面处理的方法及铸铁炊具。The invention relates to a method for surface treatment of cast iron cookware and a cast iron cookware.
背景技术Background technique
炊具与人的生活息息相关，其中铸铁炊具是最常见、最传统的的炊具之一。但铸铁炊具在空气和水同时存在时容易生锈使表面起氧化皮，严重影响外观和使用寿命。Cookware is closely related to people's lives, and cast iron cookware is one of the most common and traditional cookware. However, cast iron cookware tends to rust when air and water are present at the same time, causing the surface to scale, which seriously affects the appearance and service life.
目前，本领域技术人员通常要对铸铁炊具表面进行处理，常见的方法如在铸铁炊具表面喷涂植物油，但是该类喷涂涂层的铸铁产品，涂层比较薄，遇水短时间容易生锈问题，使得产品的使用周期大为缩短，同时造成外观质量下降。At present, the surface of the cast iron cookware is usually treated by a person skilled in the art. A common method is spraying the vegetable oil on the surface of the cast iron cookware, but the cast iron product of the spray coated coating has a thin coating and is prone to rust in a short time when water is encountered. The product life cycle is greatly shortened, and the appearance quality is degraded.
发明内容Summary of the invention
有鉴于此，本发明的目的是提供一种对铸铁炊具进行表面处理的方法，处理后的炊具能够较好的解决铸铁炊具遇水容易生锈的技术问题。In view of this, the object of the present invention is to provide a method for surface treatment of a cast iron cookware, and the treated cookware can better solve the technical problem that the cast iron cookware is easily rusted by water.
为了实现上述目的，本发明提供如下技术方案：In order to achieve the above object, the present invention provides the following technical solutions:
本发明提供一种对铸铁炊具进行表面处理的方法，包括：The invention provides a method for surface treatment of a cast iron cookware, comprising:
将铸铁炊具放到热处理设备中进行氮碳共渗处理；所述氮碳共渗的温度为500～700℃，时间为5～7h；所述氮碳共渗采用的渗剂中包括氨气65wt％～80wt％、氮气15wt％～30wt％、含碳气体4wt％～6wt％；氮碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；所述铸铁炊具表面渗层厚度为10～20μm。The cast iron cookware is placed in a heat treatment device for nitrocarburizing treatment; the nitrocarburizing temperature is 500-700 ° C for 5-7 h; the nitriding agent used for the nitrocarburizing includes ammonia gas 65 wt %～80wt%, nitrogen 15wt%～30wt%, carbon-containing gas 4wt%～6wt%; nitrocarburizing atmosphere: active nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide Hydrogen and water vapor; the thickness of the surface of the cast iron cookware is 10-20 μm.
其中，优选地，所述热处理设备为井式热处理炉、箱式热处理炉、真空热处理炉、盐浴炉或连续推盘式软氮化热处理生产线。Wherein, preferably, the heat treatment equipment is a well type heat treatment furnace, a box type heat treatment furnace, a vacuum heat treatment furnace, a salt bath furnace or a continuous push tray type soft nitriding heat treatment production line.
其中，优选地，将所述铸铁炊具放到所述热处理设备之前，进行表面去除油渍和除锈。Among them, preferably, the cast iron cookware is subjected to surface removal of oil stains and rust removal before being placed in the heat treatment apparatus.
其中，优选地，所述氮碳共渗处理完后，进行冷却。Preferably, after the nitrocarburizing treatment, cooling is performed.
其中，优选地，将所述铸铁炊具氮碳共渗处理完并冷却后，进行表面植物油涂层工艺处理。Wherein, preferably, the cast iron cookware is subjected to nitrocarburizing treatment and cooled, and then subjected to a surface vegetable oil coating process.
本发明还提供一种铸铁炊具，所述铸铁炊具经过所述的对铸铁炊具进行表面处理的方法处理。The present invention also provides a cast iron cookware which is treated by the surface treatment of the cast iron cookware.
本发明的有益效果：The beneficial effects of the invention:
本发明通过将铸铁炊具进行氮碳共渗处理，提高铸铁炊具内部结构组织稳定性，增加了铸铁炊具的韧性，使得炊具不变形、不开裂，物理性能进一步提高；并且渗层覆盖铸铁炊具表面，使得铸铁炊具具有良好的抗氧化、防生锈的功能，能够解决铸铁炊具遇水容易生锈的技术问题。The invention improves the internal structural stability of the cast iron cookware by nitrocarburizing treatment of the cast iron cookware, increases the toughness of the cast iron cookware, makes the cookware not deform and cracks, and further improves the physical properties; and the seepage layer covers the surface of the cast iron cookware, The cast iron cookware has good anti-oxidation and anti-rust functions, and can solve the technical problem that the cast iron cookware is easy to rust when exposed to water.
具体实施方式detailed description
本发明公开了一种对铸铁炊具进行表面处理的方法及铸铁炊具，本领域技术人员可以借鉴本文内容，适当改进工艺参数实现。特别需要指出的是，所述类似的替换和改动对本领域技术人员来说是显而易见的，它们都被视为包括在本发明。本发明的方法及引用已经通过较佳实施例进行了描述，相关人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和应用进行改动或适当变更与组合，来实现和应用本发明技术。The invention discloses a method for surface treatment of cast iron cookware and a cast iron cookware, and those skilled in the art can learn from the contents of the paper and appropriately improve the process parameters. It is to be understood that such alternatives and modifications are obvious to those skilled in the art and are considered to be included in the present invention. The method and the present invention have been described by the preferred embodiments, and it is obvious that the method and application described herein may be modified or appropriately modified and combined without departing from the spirit and scope of the invention. The technique of the present invention is applied.
本发明提供的一种对铸铁炊具进行表面处理的方法，包括：The invention provides a method for surface treatment of a cast iron cookware, comprising:
将铸铁炊具放到热处理设备中进行氮碳共渗处理；氮碳共渗的温度为500～700℃，时间为5～7h；所述氮碳共渗采用的渗剂中包括氨气65wt％～80wt％、氮气15wt％～30wt％、含碳气体4wt％～6wt％；氮碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；所述铸铁炊具表面渗层厚度为10～20μm。The cast iron cookware is placed in a heat treatment equipment for nitrocarburizing treatment; the temperature of nitrocarburizing is 500-700 ° C for 5-7 h; and the nitriding agent used for nitrocarburizing includes 65 wt% of ammonia gas ～ 80 wt%, nitrogen 15 wt% to 30 wt%, carbon-containing gas 4 wt% to 6 wt%; nitrocarburizing atmosphere: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen And water vapor; the surface of the cast iron cookware has a thickness of 10 to 20 μm.
本发明通过将铸铁炊具进行氮碳共渗处理，提高铸铁炊具内部结构组织稳定性，增加了铸铁炊具的韧性，使得炊具不变形、不开裂，物理性能进一步提高；并且渗层覆盖铸铁炊具表面，使得铸铁炊具具有良好的抗氧化、防生锈的功能，能够解决铸铁炊具遇水容易生锈的技术问题。The invention improves the internal structural stability of the cast iron cookware by nitrocarburizing treatment of the cast iron cookware, increases the toughness of the cast iron cookware, makes the cookware not deform and cracks, and further improves the physical properties; and the seepage layer covers the surface of the cast iron cookware, The cast iron cookware has good anti-oxidation and anti-rust functions, and can solve the technical problem that the cast iron cookware is easy to rust when exposed to water.
在本发明中，氮碳共渗的温度为500～700℃，在本发明的实施例中氮碳共渗的温度为530-700℃，在其他实施例中，氮碳共渗的温度为改为540～680℃。In the present invention, the temperature of nitrocarburizing is 500 to 700 ° C, and the temperature of nitrocarburizing in the embodiment of the present invention is 530 to 700 ° C. In other examples, the temperature of nitrocarburizing is changed. It is 540 to 680 °C.
在本发明中，氮碳共渗的时间为5～7h。In the present invention, the time of nitrocarburizing is 5 to 7 hours.
在本发明中，氮碳共渗采用的渗剂中包括氨气65wt％～80wt％、氮气15wt％～30wt％、含碳气体4wt％～6wt％。上述渗剂能够很好地吸附在铸铁炊具表 面，且形成的渗层具有良好的耐磨性、抗蚀性，从而能够解决铸铁炊具遇水容易生锈的问题。In the present invention, the osmotic agent used for nitrocarburizing includes 65 wt% to 80 wt% of ammonia gas, 15 wt% to 30 wt% of nitrogen gas, and 4 wt% to 6 wt% of carbonaceous gas. The above-mentioned osmotic agent can be well adsorbed on the surface of the cast iron cookware, and the formed permeable layer has good wear resistance and corrosion resistance, so that the problem that the cast iron cookware is easily rusted by water can be solved.
在本发明中，渗剂中包括氨气65wt％～80wt％；在本发明的实施例中，渗剂中包括氨气70wt％～75wt％。In the present invention, the infiltrant includes 65 wt% to 80 wt% of ammonia gas; in the embodiment of the present invention, the infiltrant includes 70 wt% to 75 wt% of ammonia gas.
在本发明中，渗剂中包括15wt％～30wt％氮气；在本发明的实施例，渗剂中包括20wt％～25wt％氮气。In the present invention, 15% by weight to 30% by weight of nitrogen is included in the osmotic agent; in the embodiment of the present invention, 20% by weight to 25% by weight of nitrogen is included in the osmotic agent.
在本发明中，渗剂中包括4wt％～6wt％含碳气体；在本发明的实施例中，渗剂中包括5wt％～6wt％含碳气体。In the present invention, 4% by weight to 6% by weight of the carbon-containing gas is included in the osmotic agent; in the embodiment of the present invention, 5% by weight to 6% by weight of the carbon-containing gas is included in the osmotic agent.
在本发明的实施例中，含碳气体为CO、CO 2、CH 4或C 2H 2。 In an embodiment of the invention, the carbonaceous gas is CO, CO 2 , CH 4 or C 2 H 2 .
在本发明的实施例中，热处理设备为井式热处理炉、箱式热处理炉、真空热处理炉、盐浴炉或连续推盘式软氮化热处理生产线。In an embodiment of the invention, the heat treatment equipment is a well type heat treatment furnace, a box type heat treatment furnace, a vacuum heat treatment furnace, a salt bath furnace or a continuous push-plate type soft nitriding heat treatment production line.
在本发明的实施例中，将铸铁炊具放到热处理设备之前，进行表面去除油渍和除锈；在其他实施中，铸铁炊具表面除油渍和除锈后，表面粗糙度超过1.6μm。In an embodiment of the invention, the cast iron cookware is subjected to surface removal of oil stains and rust removal prior to placement in the heat treatment apparatus; in other implementations, the surface roughness of the cast iron cookware surface after removal of oil and rust is greater than 1.6 μm.
在本发明的实施中，氮碳共渗处理完后，在空气中进行冷却；在其他实施例中，氮碳共渗处理完后，在空气中或水中进行冷却。In the practice of the present invention, after nitrocarburizing treatment, cooling is carried out in air; in other embodiments, after nitrocarburizing treatment, cooling is carried out in air or water.
铸铁炊具采用本发明的技术方案处理后，产品性能明显提高，产品技术附加值大幅增加，能更新换代目前市场上同类产品，具有投资见效快，收益高的优点，同时给企业带来良好的经济效益。After the cast iron cookware is treated by the technical scheme of the invention, the product performance is obviously improved, the added value of the product technology is greatly increased, and the similar products on the market can be updated and replaced, which has the advantages of quick investment effect and high profit, and brings good economy to the enterprise. benefit.
本发明还提供了一种铸铁炊具，铸铁炊具经过上述对铸铁炊具进行表面处理的方法处理。The present invention also provides a cast iron cookware which is subjected to the above-described method of surface treatment of a cast iron cookware.
为了进一步说明本发明，下面结合实施例对本发明提供的对铸铁炊具进行表面处理的方法及铸铁炊具进行详细描述。In order to further illustrate the present invention, a method of surface treating a cast iron cookware and a cast iron cookware provided by the present invention will be described in detail below with reference to the embodiments.
实施例1Example 1
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为1.6μm；再将铸铁炊具放到井式热处理炉中进行氮碳共渗处理；氮碳共渗的温度为530℃，时间为6h；氮碳共渗采用的渗剂中包括73wt％氨气、22wt％氮气，5wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为13μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.6 μm. The cast iron cookware was placed in a well type heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing was 530 ° C, and the time was 6 h. The nitriding agent used for nitrocarburizing includes 73wt% ammonia gas, 22wt% nitrogen gas, and 5wt% carbonaceous gas; the carbonizing atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitric oxide Nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a 13 μm thick layer; and then cooled in air to carry out a vegetable oil coating process.
实施例2Example 2
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为1.7μm；再将铸铁炊具放到箱式热处理炉中进行氮碳共渗处理；氮碳共渗的温度为680℃，时间为5h；氮碳共渗采用的渗剂中包括65wt％氨气、30％wt氮气，5wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为14μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.7 μm. The cast iron cookware was placed in a box heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing was 680 ° C for 5 h. The nitriding agent used for nitrocarburizing includes 65 wt% ammonia gas, 30% wt nitrogen gas, and 5 wt% carbon-containing gas; the carbon osmosis atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, and mono-oxidation. Nitrogen, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a layer having a thickness of 14 μm; and then cooled in air to carry out a vegetable oil coating process.
实施例3Example 3
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为2.1μm；再将铸铁炊具放到真空热处理炉中进行氮碳共渗处理；氮碳共渗的温度为700℃，时间为6h；氮碳共渗采用的渗剂中包括80wt％氨气、15wt％氮气，5wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为16μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware is degreased and derusted, so that the surface roughness of the cast iron is 2.1 μm; then the cast iron cookware is placed in a vacuum heat treatment furnace for nitrocarburizing treatment; the temperature of nitrocarburizing is 700 ° C, the time is 6 h; The nitriding agent used for nitrocarburizing includes 80 wt% ammonia gas, 15 wt% nitrogen gas, and 5 wt% carbon-containing gas; the carbon permeable atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitrogen monoxide, Nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a layer having a thickness of 16 μm; and then cooled in air to carry out a vegetable oil coating process.
实施例4Example 4
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为1.8μm；再将铸铁炊具放到连续推盘式软氮化热处理生产线进行氮碳共渗处理；氮碳共渗的温度为580℃，时间为5h；氮碳共渗采用的渗剂中包括76wt％氨气、20wt％氮气，4wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为17μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.8 μm. The cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 580 °C. The time is 5h; the nitriding agent used for nitrocarburizing includes 76wt% ammonia gas, 20wt% nitrogen gas, 4wt% carbon-containing gas; carbonitriding atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide Nitric oxide, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a thickness of 17 μm; and then cooled in air to carry out a vegetable oil coating process.
实施例5Example 5
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为1.9μm；再将铸铁炊具放到连续推盘式软氮化热处理生产线中进行氮碳共渗处理；氮碳共渗的温度为540℃，时间为5h；氮碳共渗采用的渗剂中包括70wt％氨气、25wt％氮气，5wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为17μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 1.9 μm. The cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 540. °C, the time is 5h; the osmotic agent used in nitrocarburizing includes 70wt% ammonia gas, 25wt% nitrogen gas, and 5wt% carbon-containing gas; the carbonizing atmosphere is: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, Carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a thickness of 17 μm; and then cooled in air to carry out a vegetable oil coating process.
实施例6Example 6
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为2.0μm；再将铸铁炊具放到连续推盘式软氮化热处理生产线中进行氮碳共渗处理；氮碳共渗的温度 为650℃，时间为6h；氮碳共渗采用的渗剂中包括75wt％氨气、20wt％氮气，5wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为16μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware was degreased and derusted, so that the surface roughness of the cast iron was 2.0 μm. The cast iron cookware was placed in a continuous push-type soft nitriding heat treatment line for nitrocarburizing treatment; the temperature of nitrocarburizing was 650. °C, the time is 6h; the nitriding agent used for nitrocarburizing includes 75wt% ammonia gas, 20wt% nitrogen gas, and 5wt% carbon-containing gas; the carbon osmosis atmosphere is: reactive nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, Carbon dioxide, nitrogen monoxide, nitrogen dioxide, hydrogen and water vapor; the surface of the cast iron cookware is formed into a thickness of 16 μm; and then cooled in air to carry out a vegetable oil coating process.
实施例7Example 7
将铸铁炊具表面除油渍和除锈，使得铸铁表面粗糙度为1.8μm；再将铸铁炊具放到连续推盘式软氮化热处理生产线中进行氮碳共渗处理；氮碳共渗的温度为500℃，时间7h；氮碳共渗采用的渗剂中包括74wt％氨气、20wt％氮气，6wt％含碳气体；碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；使得铸铁炊具表面形成厚度为15μm的渗层；再在空气中进行冷却后进行植物油涂层工艺处理。The surface of the cast iron cookware is degreased and derusted, so that the surface roughness of the cast iron is 1.8μm; then the cast iron cookware is placed in the continuous push-type soft nitriding heat treatment production line for nitrocarburizing treatment; the temperature of nitrocarburizing is 500. °C, time 7h; nitriding agent used in nitrocarburizing includes 74wt% ammonia gas, 20wt% nitrogen gas, 6wt% carbon-containing gas; carbonitriding atmosphere is: reactive nitrogen, activated carbon, ammonia, nitrogen, carbon monoxide, carbon dioxide Nitric oxide, nitrogen dioxide, hydrogen and water vapor; forming a layer of 15 μm thick on the surface of the cast iron cookware; and then cooling in air to carry out a vegetable oil coating process.
将实施例1～7制造的铸铁炊具进行盐雾试验6h-8h后,腐蚀等级》6级。The cast iron cookware manufactured in Examples 1 to 7 was subjected to a salt spray test for 6 h to 8 h, and the corrosion grade was 6 grade.
对实施例1～7制造的铸铁炊具表面硬度、磨损量和耐蚀性的测试，结果见表1。The surface hardness, the amount of wear and the corrosion resistance of the cast iron cookware manufactured in Examples 1 to 7 were tested. The results are shown in Table 1.
其中硬度的测试为用显微硬度计检测试样的硬度，载荷为200g，通过沿垂直于渗层表面从渗层到铸铁方向进行硬度测试。The hardness test is to test the hardness of the sample with a microhardness tester, and the load is 200 g, and the hardness test is performed by going from the layer to the cast iron direction perpendicular to the surface of the layer.
磨损量的测试为在立式万能摩擦试验机上进行销盘试验，上试件材料为高速钢，硬度为HRC63，下试件基体材料是灰铸铁，硬度为HB220，并分别对实施例1～4制造的铸铁炊具进行表面硬度处理。载荷为200N，矿物油56EP浸油润滑，转速为1000r/min，连续运行3h，常温常压下测试。The wear amount is tested on the vertical universal friction tester. The upper test piece material is high speed steel, the hardness is HRC63, the lower test piece base material is gray cast iron, the hardness is HB220, and the examples 1 to 4 respectively. The cast iron cookware produced is subjected to surface hardness treatment. The load is 200N, the mineral oil 56EP is lubricated with oil, the rotation speed is 1000r/min, continuous operation for 3h, and the test is carried out under normal temperature and normal pressure.
耐蚀性的测试为将实施例1～4制造的铸铁炊具经2wt％硫酸(或10wt％氢氧化钠溶液)煮沸1h后重量比腐蚀前重量减轻的百分比。The corrosion resistance was measured as a percentage of the weight-to-corrosion weight reduction of the cast iron cookware manufactured in Examples 1 to 4 after boiling for 2 hours with 2 wt% sulfuric acid (or 10 wt% sodium hydroxide solution).
表1 实验结果Table 1 Experimental results
表面硬度(HV)Surface hardness (HV) 磨损量(g)Wear amount (g) 重量减轻的百分比Percentage of weight loss
实施例1Example 1 336336 0.090.09 1.31.3
实施例2Example 2 339339 0.080.08 1.21.2
实施例3Example 3 328328 0.100.10 1.91.9
实施例4Example 4 331331 0.080.08 1.51.5
实施例5Example 5 336336 0.090.09 1.51.5
实施例6Example 6 334334 0.100.10 1.61.6
实施例7Example 7 332332 0.080.08 1.71.7
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖性特点相一致的最宽的范围。The above description of the disclosed embodiments is provided to enable a person skilled in the art to make or use the invention described herein. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein.

Claims (6)

  1. 一种对铸铁炊具进行表面处理的方法，其特征在于，包括：A method for surface treatment of a cast iron cookware, characterized in that it comprises:
    将铸铁炊具放到热处理设备中进行氮碳共渗处理；所述氮碳共渗的温度为500～700℃，时间为5～7h；所述氮碳共渗采用的渗剂中包括氨气65wt％～80wt％、氮气15wt％～30wt％、含碳气体4wt％～6wt％；氮碳共渗气氛为：活性氮、活性碳、氨气、氮气、一氧化碳、二氧化碳、一氧化氮、二氧化氮、氢气及水蒸气；所述铸铁炊具表面渗层厚度为10～20μm。The cast iron cookware is placed in a heat treatment device for nitrocarburizing treatment; the nitrocarburizing temperature is 500-700 ° C for 5-7 h; the nitriding agent used for the nitrocarburizing includes ammonia gas 65 wt %～80wt%, nitrogen 15wt%～30wt%, carbon-containing gas 4wt%～6wt%; nitrocarburizing atmosphere: active nitrogen, activated carbon, ammonia gas, nitrogen gas, carbon monoxide, carbon dioxide, nitrogen monoxide, nitrogen dioxide Hydrogen and water vapor; the thickness of the surface of the cast iron cookware is 10-20 μm.
  2. 如权利要求1所述的方法，其特征在于，所述热处理设备为井式热处理炉、箱式热处理炉、真空热处理炉、盐浴炉或连续推盘式软氮化热处理生产线。The method according to claim 1, wherein said heat treatment equipment is a well type heat treatment furnace, a box type heat treatment furnace, a vacuum heat treatment furnace, a salt bath furnace or a continuous push-plate type soft nitriding heat treatment production line.
  3. 如权利要求1所述的方法，其特征在于，将所述铸铁炊具放到所述热处理设备之前，进行表面去除油渍和除锈。The method of claim 1 wherein the cast iron cookware is subjected to surface removal of oil stains and rust removal prior to placing the cast iron cookware.
  4. 如权利要求1所述的方法，其特征在于，所述氮碳共渗处理完后，进行冷却。The method of claim 1 wherein said nitrocarburizing treatment is followed by cooling.
  5. 如权利要求1所述的方法，其特征在于，将所述铸铁炊具氮碳共渗处理完并冷却后，进行表面植物油涂层工艺处理。The method according to claim 1, wherein the cast iron cookware is subjected to nitrocarburizing treatment and cooled, and then subjected to a surface vegetable oil coating process.
  6. 一种铸铁炊具，其特征在于，所述铸铁炊具经过权利要求1～5中任一项所述的对铸铁炊具进行表面处理的方法处理。A cast iron cookware characterized in that the cast iron cookware is subjected to a surface treatment of the cast iron cookware according to any one of claims 1 to 5.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111962016A (en) * 2020-09-03 2020-11-20 江苏良川科技发展有限公司 Preparation method of steel lamp pole

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1126769A (en) * 1995-06-15 1996-07-17 铁道部科学研究院金属及化学研究所 Prodn process of antirust iron kitchen utensils
US6406560B1 (en) * 2000-02-04 2002-06-18 Ipsen International Gmbh Method for the thermal treatment of metal
CN101050517A (en) * 2007-05-15 2007-10-10 上海工业大学嘉定通用机械有限公司 Technique method of treatment for modifying surface of ferrous material
CN106958019A (en) * 2017-04-05 2017-07-18 邢台三厦铸铁有限公司 The surface treatment method and cast iron cooker of cast iron cooker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1126769A (en) * 1995-06-15 1996-07-17 铁道部科学研究院金属及化学研究所 Prodn process of antirust iron kitchen utensils
US6406560B1 (en) * 2000-02-04 2002-06-18 Ipsen International Gmbh Method for the thermal treatment of metal
CN101050517A (en) * 2007-05-15 2007-10-10 上海工业大学嘉定通用机械有限公司 Technique method of treatment for modifying surface of ferrous material
CN106958019A (en) * 2017-04-05 2017-07-18 邢台三厦铸铁有限公司 The surface treatment method and cast iron cooker of cast iron cooker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111962016A (en) * 2020-09-03 2020-11-20 江苏良川科技发展有限公司 Preparation method of steel lamp pole

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