Surface treatment method for stainless steel coated tableware

Abstract

The invention relates to a surface treatment method for stainless steel coated tableware, and belongs to the technical field of metal surface treatment. The corrosion resistance and light weight of the stainless steel tableware are achieved through base material pretreatment, chemical cleaning, activating treatment, heating in a vacuum environment, ion bombardment cleaning, preparation of a bottom Ti layer through a physical vapor deposition method, preparation of a middle TiC layer through a chemical vapor deposition method, preparation of a surface TiO2 layer through high-temperature oxidation and preparation of a hydrophobic and oleophobic layer through a chemical vapor deposition method. A Ti layer is formed on the contact stainless steel bottom layer through multi-layer titanium plating, a TiC layer is formed in the middle, a TiO2 layer is formed on the surface layer, better corrosion resistance and abrasion resistance are achieved through the complementary characteristic of materials of all the layers, and then the hydrophobic and oleophobic properties of the TiO2 surface layer are enhanced through chemical vapor deposition of fluoride.

Description

Technical Field

[0001] The invention belongs to the technical field of metal surface treatment and relates to a surface treatment method for stainless steel coated tableware. Background Art

[0002] Stainless steel tableware is widely used in households and the catering industry due to its durability, corrosion resistance and aesthetics. However, in order to further enhance its performance, especially in terms of antibacterial, wear resistance and antifouling properties, coating technology is widely used. Existing stainless steel tableware coating technologies mainly include physical vapor deposition, chemical vapor deposition and electroplating methods, which provide additional protection and functionality by forming a thin film on the surface of tableware.

[0003] However, these existing technologies also have some defects and challenges. First, the adhesion and uniformity of the coating are technical difficulties. Uneven coating may cause local wear and reduce the overall performance of tableware. In order to overcome these defects, the present invention uses multi-layer titanium plating to utilize the complementary characteristics of each layer of material to achieve better corrosion resistance and wear resistance, and then enhances the hydrophobicity and oleophobicity of the TiO2 surface layer through chemical vapor deposition of fluoride, making stainless steel tableware more durable and easier to clean. Summary of the invention

[0004] The present invention relates to a surface treatment method for stainless steel coated tableware, and belongs to the technical field of metal surface treatment. The present invention achieves corrosion resistance and lightweight of stainless steel tableware by substrate pretreatment, chemical cleaning, activation treatment, heating under vacuum environment, ion bombardment cleaning, physical vapor deposition method to prepare bottom Ti layer, chemical vapor deposition method to prepare middle TiC layer, high temperature oxidation method to prepare surface TiO2 layer, chemical vapor deposition method to prepare hydrophobic and oleophobic layer. And by multi-layer titanium plating, a Ti layer is formed on the bottom layer in contact with stainless steel, a TiC layer is formed in the middle, and a TiO2 layer is formed on the surface, and the complementary characteristics of each layer of material are utilized to achieve better corrosion resistance and wear resistance, and then the hydrophobic and oleophobic properties of the TiO2 surface layer are enhanced by chemical vapor deposition of fluoride.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, (6) physical vapor deposition method to prepare a bottom Ti layer, (7) chemical vapor deposition method to prepare an intermediate TiC layer, (8) high temperature oxidation method to prepare a surface TiO2 layer, and (9) chemical vapor deposition method to prepare a hydrophobic and oleophobic layer.

[0007] As a preferred technical solution of the present invention, the substrate pretreatment in step (1) includes degreasing, rust removal and polishing; the degreasing is to wipe the stainless steel surface with an alkaline substance at 40-60°C to remove grease and other organic pollutants, and then rinse with clean water to remove residual alkaline substances; the rust removal is to immerse the stainless steel in a 5-10% hydrochloric acid solution for 5-10 minutes and then wash away the residual acid; the polishing is to evenly apply a phosphoric acid-type polishing liquid on the stainless steel surface and then polish it with a polishing machine for 5-15 minutes.

[0008] As a preferred technical solution of the present invention, the chemical cleaning in step (2) is to soak the stainless steel in an alkaline cleaning agent for 5-15 minutes to further remove residual polishing liquid and contaminants, then rinse thoroughly with clean water to remove residual solution and dry.

[0009] As a preferred technical solution of the present invention, the activation treatment in step (3) is to immerse the stainless steel surface in a 5%-10% hydrofluoric acid solution for 1-5 minutes.

[0010] As a preferred technical solution of the present invention, the vacuum pressure of the heating in the vacuum environment in step (4) is 10 -3 -10 -5 Pa, the heating temperature is 200-500℃, and the heating time is 1-3 hours.

[0011] As a preferred technical solution of the present invention, the ion bombardment cleaning in step (5) is carried out at 10 -3 -10 -5 After introducing argon gas under a vacuum of 1.5 Pa pressure, the ion source device is started to generate an ion beam with an energy of 200-500V, which bombards the stainless steel surface for 5-10 minutes.

[0012] As a preferred technical solution of the present invention, the vapor deposition in step (6) is carried out at a pressure of 10 -5 -10 - 7 Under the vacuum condition of 1000-1500°C, high-purity titanium is heated to 1500-1800°C to evaporate into titanium atoms or titanium ions and deposited on the surface of stainless steel as a Ti layer.

[0013] As a preferred technical solution of the present invention, the intermediate TiC layer in step (7) is deposited by chemical vapor deposition, and a mixture of titanium halide TiCl4 and carbon source gas CH4 is made to react on the surface of the Ti layer to form TiC at 800-1000°C.

[0014] As a preferred technical solution of the present invention, the surface TiO2 layer in step (8) is formed by exposing the TiC layer to a high-temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2.

[0015] As a preferred technical solution of the present invention, the hydrophobic and oleophobic layer in step (9) is prepared by introducing hexafluoropropylene gas into the reaction chamber at 150-250° C. through chemical vapor deposition equipment and depositing it for 1-3 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the surface of the stainless steel.

[0016] Beneficial effects of the present invention:

[0017] (1) Through multi-layer titanium plating, a Ti layer is formed on the bottom layer in contact with the stainless steel, a TiC layer is formed in the middle, and a TiO2 layer is formed on the surface. First, the Ti layer provides preliminary corrosion protection and good adhesion to ensure a strong bond between the coating and the stainless steel substrate, avoiding subsequent peeling or cracking of the coating due to surface defects of the substrate; then the TiC layer with higher hardness provides excellent hardness and wear resistance, and uses the difference in buffering thermal expansion coefficients to reduce stress accumulation between different materials during temperature changes and avoid cracking of the coating layer; finally, the TiO2 layer provides wear resistance and corrosion resistance, while improving the oxidation resistance of the coating.

[0018] (2) By utilizing the low surface energy characteristics of fluoride, a chemically bonded fluoride layer is formed on the surface of TiO2, which reduces the free energy of the TiO2 surface and allows the liquid to form a larger contact angle on the surface, exhibiting hydrophobic and oleophobic properties, thereby achieving the effect of anti-fouling and easy-to-clean stainless steel tableware. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0020] Example 1

[0021] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, (6) physical vapor deposition method to prepare a bottom Ti layer, (7) chemical vapor deposition method to prepare an intermediate TiC layer, (8) high temperature oxidation method to prepare a surface TiO2 layer, and (9) chemical vapor deposition method to prepare a hydrophobic and oleophobic layer.

[0022] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0023] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0024] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0025] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0026] The ion bombardment cleaning in step (5) is carried out at 10 -4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0027] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6 Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1600°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 100 nm.

[0028] The intermediate TiC layer in step (7) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is heated at 900°C to react on the surface of the Ti layer to form TiC with a thickness of 400 nm.

[0029] The surface TiO2 layer in step (8) is formed by exposing the TiC layer to a high temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2 with a thickness of 100 nm.

[0030] The hydrophobic and oleophobic layer in step (9) is prepared by introducing hexafluoropropylene gas into a reaction chamber at 200° C. through a chemical vapor deposition device and depositing it for 2 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the stainless steel surface.

[0031] Example 2

[0032] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, (6) physical vapor deposition method to prepare a bottom Ti layer, (7) chemical vapor deposition method to prepare an intermediate TiC layer, (8) high temperature oxidation method to prepare a surface TiO2 layer, and (9) chemical vapor deposition method to prepare a hydrophobic and oleophobic layer.

[0033] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 40° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 5 minutes.

[0034] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 5 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0035] The activation treatment in step (3) is to immerse the stainless steel surface in a 5% hydrofluoric acid solution for 2 minutes.

[0036] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0037] The ion bombardment cleaning in step (5) is carried out at 10 -4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0038] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6 Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1700°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 100 nm.

[0039] The intermediate TiC layer in step (7) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is heated at 900°C to react on the surface of the Ti layer to form TiC with a thickness of 400 nm.

[0040] The surface TiO2 layer in step (8) is formed by exposing the TiC layer to a high temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2 with a thickness of 100 nm.

[0041] The hydrophobic and oleophobic layer in step (9) is prepared by introducing hexafluoropropylene gas into a reaction chamber at 200° C. through a chemical vapor deposition device and depositing it for 2 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the stainless steel surface.

[0042] Comparative Example 1

[0043] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, (6) physical vapor deposition method to prepare a bottom Ti layer, (7) chemical vapor deposition method to prepare a surface TiO2 layer, and (8) chemical vapor deposition method to prepare a hydrophobic and oleophobic layer.

[0044] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0045] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0046] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0047] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0048] The ion bombardment cleaning in step (5) is carried out at 10 -4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0049] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1600°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 250nm.

[0050] The surface TiO2 layer in step (7) is prepared by heating the substrate to 500°C in the reaction chamber of the vapor deposition equipment, pre-blowing with argon, introducing TiCl4 at a flow rate of 40 sccm, introducing O2 at a flow rate of 400 sccm, and depositing for 25 minutes to obtain a 250nm TiO2 layer.

[0051] The hydrophobic and oleophobic layer in step (8) is prepared by introducing hexafluoropropylene gas into a reaction chamber at 200° C. through a chemical vapor deposition device and depositing it for 2 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the stainless steel surface.

[0052] Comparative Example 2

[0053] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, (6) preparing an intermediate TiC layer by chemical vapor deposition, (7) preparing a surface TiO2 layer by high temperature oxidation, and (8) preparing a hydrophobic and oleophobic layer by chemical vapor deposition.

[0054] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0055] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0056] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0057] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0058] The ion bombardment cleaning in step (5) is carried out at 10 -4After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0059] The intermediate TiC layer in step (6) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is heated at 900°C to react on the surface of the Ti layer to form TiC with a thickness of 500 nm.

[0060] The surface TiO2 layer in step (7) is formed by exposing the TiC layer to a high-temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2 with a thickness of 100 nm.

[0061] The hydrophobic and oleophobic layer in step (8) is prepared by introducing hexafluoropropylene gas into a reaction chamber at 200° C. through a chemical vapor deposition device and depositing it for 2 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the stainless steel surface.

[0062] Comparative Example 3

[0063] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under a vacuum environment, (5) ion bombardment cleaning, (6) preparing a bottom Ti layer by physical vapor deposition, and (7) preparing a surface TiC layer by chemical vapor deposition.

[0064] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0065] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0066] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0067] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0068] The ion bombardment cleaning in step (5) is carried out at 10-4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0069] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6 Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1600°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 100 nm.

[0070] The surface TiC layer in step (7) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is heated at 900°C to react on the surface of the Ti layer to form TiC with a thickness of 400 nm.

[0071] Comparative Example 4

[0072] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under vacuum environment, (5) ion bombardment cleaning, and (6) preparing a bottom Ti layer by physical vapor deposition.

[0073] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0074] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0075] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0076] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0077] The ion bombardment cleaning in step (5) is carried out at 10 -4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0078] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6 Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1600°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 500nm.

[0079] Comparative Example 5

[0080] A method for surface treatment of stainless steel coated tableware, characterized in that it comprises the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under a vacuum environment, (5) ion bombardment cleaning, (6) physical vapor deposition method to prepare a bottom Ti layer, (7) chemical vapor deposition method to prepare an intermediate TiC layer, and (8) high temperature oxidation to prepare a surface TiO2 layer.

[0081] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first, the stainless steel is immersed in a 3% NaOH solution at 50° C. for 5 minutes and the surface is wiped to remove grease and other organic pollutants, and then rinsed with clean water to remove residual alkaline substances, and then the stainless steel is immersed in an 8% hydrochloric acid solution for 6 minutes to wash away the residual acid, 1 part by weight of deionized water is added to an acid-resistant container, and then 2 parts by weight of 85% phosphoric acid solution is slowly added to the water and continuously stirred, and finally 1 part by weight of 98% concentrated sulfuric acid solution is slowly added to prepare a phosphoric acid type polishing liquid, and the phosphoric acid type polishing liquid is evenly applied to the stainless steel surface and then polished with a polishing machine for 8 minutes.

[0082] The chemical cleaning in step (2) is to soak the stainless steel in 1% NaOH solution for 8 minutes to further remove the residual polishing liquid and contaminants, then rinse thoroughly with a large amount of clean water to remove the residual solution and dry.

[0083] The activation treatment in step (3) is to immerse the stainless steel surface in 8% hydrofluoric acid solution for 2 minutes.

[0084] The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -4 Pa, heating temperature is 300℃ for 2 hours.

[0085] The ion bombardment cleaning in step (5) is carried out at 10 -4 After introducing argon gas under a Pa vacuum, the ion source device was started to generate an ion beam with an energy of 300V, which bombarded the stainless steel surface for 7 minutes.

[0086] The titanium ion evaporation deposition in step (6) is carried out at a pressure of 10 -6 Under the vacuum condition of 1000 Torr, high-purity titanium is heated to 1600°C to evaporate into titanium atoms or titanium ions and deposited on the stainless steel surface as a Ti layer with a thickness of 100 nm.

[0087] The intermediate TiC layer in step (7) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is heated at 900°C to react on the surface of the Ti layer to form TiC with a thickness of 400 nm.

[0088] The surface TiO2 layer in step (8) is formed by exposing the TiC layer to a high temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2 with a thickness of 100 nm.

[0089] Performance Testing

[0090] The wear resistance test is carried out according to the ASTM D4060 Taber abrasion test standard. The unit is mg / 1000 revolutions, which means the mass loss after 1000 rotations of abrasion.

[0091] Anti-corrosion test is carried out according to ASTM G48 pitting test standard, the unit is μm;

[0092] The water contact angle on the surface of stainless steel tableware is measured according to the ASTM D7334 standard. The unit is degrees. The larger the contact angle, the more hydrophobic the surface is.

[0093] According to the ASTM D5946 standard, the oil contact angle on the surface of stainless steel tableware is measured in degrees. The larger the contact angle, the more oleophobic the surface is.

[0094] The test results are shown in the following table:

[0095] From the test results, it can be seen that the present invention forms a Ti layer on the bottom layer in contact with the stainless steel, a TiC layer in the middle, and a TiO2 layer on the surface through multi-layer titanium plating, and utilizes the complementary characteristics of each layer material to achieve better corrosion resistance and wear resistance.

[0096] By utilizing the low surface energy characteristics of fluoride, a chemically bonded fluoride layer is formed on the surface of TiO2, which reduces the free energy of the TiO2 surface, allowing the liquid to form a larger contact angle on the surface, exhibiting better hydrophobic and oleophobic properties, thereby achieving the effect of anti-fouling and easy-to-clean stainless steel tableware.

[0097] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A surface treatment method for stainless steel coated tableware, characterized in that: The following steps are involved: (1) Substrate pretreatment, (2) Chemical cleaning, (3) Activation treatment, (4) Heating under vacuum, (5) Ion bombardment cleaning, (6) Physical vapor deposition to prepare the bottom Ti layer, (7) Chemical vapor deposition to prepare the middle TiC layer, (8) High temperature oxidation to prepare the surface TiO2 layer, (9) Chemical vapor deposition to prepare the hydrophobic and oleophobic layer.

2. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; the degreasing is to wipe the stainless steel surface with an alkaline substance at 40-60°C to remove grease and other organic pollutants, and then rinse with clean water to remove residual alkaline substances; the rust removal is to immerse the stainless steel in a 5-10% hydrochloric acid solution for 5-10 minutes and then wash away the residual acid; the polishing is to evenly apply a phosphoric acid-type polishing liquid on the stainless steel surface and then polish it with a polishing machine for 5-15 minutes.

3. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The chemical cleaning in step (2) is to soak the stainless steel in an alkaline cleaning agent for 5-15 minutes to further remove residual polishing liquid and contaminants, then rinse thoroughly with clean water to remove residual solution and dry.

4. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The activation treatment in step (3) is to immerse the stainless steel surface in a 5%-10% hydrofluoric acid solution for 1-5 minutes.

5. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The vacuum pressure of the heating in the vacuum environment in step (4) is 10 -3 -10 -5 Pa, the heating temperature is 200-500℃, and the heating time is 1-3 hours.

6. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The ion bombardment cleaning in step (5) is carried out at 10 -3 -10 -5 After introducing argon gas under a vacuum of 1.5 Pa pressure, the ion source device is started to generate an ion beam with an energy of 200-500V, which bombards the stainless steel surface for 5-10 minutes.

7. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The vapor deposition in step (6) is carried out at a pressure of 10 -5 -10 -7 Under the vacuum condition of 1000-1500°C, high-purity titanium is heated to 1500-1800°C to evaporate into titanium atoms or titanium ions and deposited on the surface of stainless steel as a Ti layer.

8. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The intermediate TiC layer in step (7) is deposited by chemical vapor deposition, where a mixture of titanium halide TiCl4 and carbon source gas CH4 is mixed at 800-1000°C to allow the gas to react on the surface of the Ti layer to form TiC.

9. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The surface TiO2 layer in step (8) is formed by exposing the TiC layer to a high-temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2.

10. The surface treatment method of stainless steel coated tableware according to claim 1, characterized in that: The hydrophobic and oleophobic layer in step (9) is prepared by introducing hexafluoropropylene gas into a reaction chamber at 150-250° C. through chemical vapor deposition equipment and depositing for 1-3 hours to obtain a hydrophobic and oleophobic TiO2 fluoride layer on the stainless steel surface.

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