CN-121970983-A - Preparation method of non-coating hydrophobic low-carbon steel non-stick iron pan

Abstract

The invention relates to the field of metal material surface modification technology and cooker manufacturing, in particular to a preparation method of a non-coating hydrophobic low-carbon steel non-stick iron pan. The method comprises the following steps of firstly selecting a base material, namely selecting low-carbon steel with carbon content less than or equal to 0.2% as the base material, secondly performing heat treatment, namely performing two-stage heat treatment on the base material in the step (1), performing austenitizing heat preservation, performing air cooling to room temperature and tempering at a low temperature, thirdly performing surface corrosion modification, namely preparing a corrosion solution which is a mixed system of 96% ethanol and 4% nitric acid in volume fraction, and soaking the base material subjected to the heat treatment in the ethanol-nitric acid mixed corrosion solution prepared by the method under the normal temperature condition. The invention realizes the optimization of the grain size and the grain boundary state of the base material through the optimized heat treatment process, forms a uniform and compact micron-sized coarse grain boundary structure on the surface of the base material through the selective corrosion action of the corrosive liquid on the grain boundary, realizes the non-sticking effect, has simple process and is suitable for large-scale industrialized popularization.

Inventors

• HAN YU
• WANG SHAOQING
• YANG ZHONG
• DUAN HONGBO
• YANG WEI

Assignees

• 西安工业大学

Dates

Publication Date

20260505

Application Date

20260127

Claims (5)

1. 1. The preparation method of the non-stick iron pan of the non-coating hydrophobic low-carbon steel is characterized by comprising the following steps of Selecting a base material, namely selecting a low-carbon steel pot embryo with the carbon content less than or equal to 0.2% as the base material; Performing heat treatment, namely performing two-stage heat treatment on the base material in the first step, performing austenitizing heat preservation, performing air cooling to room temperature, and performing low-temperature tempering; Preparing corrosion liquid which is a mixed system of 96% ethanol and 4% nitric acid in volume fraction, and soaking the base material subjected to the heat treatment in the step two in the corrosion liquid under the normal temperature condition to obtain the modified low-carbon steel non-stick iron pan.
2. 2. The method for preparing a non-stick iron pan of non-coated hydrophobic low carbon steel as claimed in claim 1, wherein in the second step, austenitizing is performed at 1000-1150 ℃ for 30 minutes.
3. 3. The method of claim 2, wherein in the second step, the steel is tempered at 300 ℃ for 5 minutes.
4. 4. The method for preparing a non-stick iron pan with non-coating hydrophobic low-carbon steel as claimed in claim 3, wherein in the third step, the normal temperature is 25 ℃, and the soaking time is 10-15 seconds.
5. 5. The method of claim 4, wherein the carbon content of the low-carbon steel in the first step is less than or equal to 0.2%, the sulfur content is less than or equal to 0.025%, and the phosphorus content is less than or equal to 0.028%.

Description

Preparation method of non-coating hydrophobic low-carbon steel non-stick iron pan Technical Field The invention relates to the field of metal material surface modification technology and cooker manufacturing, in particular to a preparation method of a non-coating hydrophobic low-carbon steel non-stick iron pan. Background The iron pan has the advantages of uniform heat conduction, supplementing iron elements required by human bodies and the like, and is a common cooker for household cooking for a long time, but the traditional iron pan has the problems of easy adhesion and difficult cleaning of the surface. In order to solve the problem, the main non-stick iron pot in the market adopts high polymer materials such as Polytetrafluoroethylene (PTFE) to carry out surface spraying treatment, however, the coating non-stick iron pot has the obvious defects that firstly, when in high-temperature cooking, the coating is easy to peel off and decompose, harmful chemical substances are released, serious food safety hidden danger exists, the coating is strictly limited by food safety standards, secondly, the durability of the coating is poor, the anti-sticking effect is fast attenuated after long-term use, the service life is short, and thirdly, the problems of volatilization of organic solvents and the like exist in the preparation process of the coating, so that the environment is polluted. In order to break through the dependence on organic coating, the field of material science begins to explore the technical path for realizing natural nonstick effect through the regulation and control of metal surface microstructure, such as the methods of super-hydrophobic coating preparation, laser etching micro-nano structure and the like. However, the technologies have the problems of large equipment investment, complex process and high production cost, and are difficult to realize large-scale industrialized popularization and application. Therefore, developing a technology for preparing a non-coating non-stick iron pan with simple process, low cost, safety and environmental protection becomes a technical problem to be solved urgently in the cooker industry. Disclosure of Invention The invention provides a preparation method of a non-coating hydrophobic low-carbon steel non-stick iron pan, which aims to solve the problems of large equipment investment, complex process and high production cost in the prior art. In order to achieve the purpose, the technical scheme provided by the invention is that the preparation method of the non-coating hydrophobic low-carbon steel non-stick iron pan comprises the following steps of: Selecting a base material, namely selecting a low-carbon steel pot embryo with the carbon content less than or equal to 0.2% as the base material; Performing heat treatment, namely performing two-stage heat treatment on the base material in the first step, performing austenitizing heat preservation, performing air cooling to room temperature, and performing low-temperature tempering; Preparing corrosion liquid which is a mixed system of 96% ethanol and 4% nitric acid in volume fraction, and soaking the base material subjected to the heat treatment in the step two in the corrosion liquid under the normal temperature condition to obtain the modified low-carbon steel non-stick iron pan. Further, in the second step, austenitizing and heat preserving are carried out for 30 minutes at 1000-1150 ℃. Further, in the second step, tempering is performed at a low temperature of 300 ℃ for 5 minutes. Further, in the third step, the normal temperature is 25 ℃, and the soaking time is 10-15 seconds. Further, the low carbon steel in the first step has carbon content less than or equal to 0.2%, sulfur content less than or equal to 0.025% and phosphorus content less than or equal to 0.028%. Compared with the prior art, the invention has the advantages that: 1. The base material is selected from low carbon steel with the carbon content less than or equal to 0.2% and the impurity element content such as sulfur, phosphorus and the like meeting the limiting conditions, the selected base material can reduce the interference of the base material on the uniformity of grain boundary corrosion, ensure the controllable corrosion process, simultaneously meet the requirements on corrosion resistance and mechanical properties in the cooking process of the iron pan prepared by the base material, avoid deformation or corrosion failure in the use process, and is particularly suitable for technical scenes of realizing the intrinsic non-stick function of the metal surface through microstructure regulation. 2. The heat treatment process is optimized, namely a two-stage heat treatment process of high-temperature austenitizing and low-temperature tempering is adopted, and precise regulation and control of the microstructure of the base material are realized. The method comprises the steps of carrying out first-stage heat treatment to enable a substrate