A surface treatment method for stainless steel coated tableware

Abstract

The present invention relates to a surface treatment method for stainless steel coated tableware, belonging to the technical field of metal surface treatment. Through substrate pretreatment, chemical cleaning, activation treatment, heating in a vacuum environment, ion bombardment cleaning, preparing the bottom Ti layer by physical vapor deposition method, preparing the intermediate TiC layer by chemical vapor deposition method, preparing the surface TiO2 layer by high-temperature oxidation, and preparing the hydrophobic and oleophobic layer by chemical vapor deposition method, the corrosion resistance and lightweight of stainless steel tableware are achieved. By multi-layer titanium plating, a Ti layer is formed in contact with the stainless steel bottom layer, a TiC layer is formed in the middle, and a TiO2 layer is formed on the surface. Utilizing the complementary characteristics of each layer of materials, better corrosion resistance and wear resistance are achieved. Then, the hydrophobic and oleophobic properties of the TiO2 surface layer are enhanced by chemical vapor deposition of fluoride.

Description

Technical Field

[0001] The present 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 improve its performance, especially in terms of antibacterial, wear resistance, and stain resistance, coating technologies have been widely adopted. Existing stainless steel tableware coating technologies mainly include physical vapor deposition, chemical vapor deposition, and electroplating methods. By forming a thin film on the surface of the tableware, additional protection and functions are provided.

[0003] However, these existing technologies also have some defects and challenges. First of all, the adhesion and uniformity of the coating are technical difficulties. An uneven coating may lead to local wear and reduce the overall performance of the tableware. To overcome these defects, the present invention uses multi-layer titanium plating to utilize the complementary characteristics of each layer of materials to achieve better corrosion resistance and wear resistance, and then enhances the hydrophobic and oleophobic properties of the TiO2 surface layer by chemical vapor deposition of fluoride, making the 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, belonging to the technical field of metal surface treatment. The present invention realizes the corrosion resistance and lightweight of stainless steel tableware through substrate pretreatment, chemical cleaning, activation treatment, heating in a vacuum environment, ion bombardment cleaning, preparing a bottom Ti layer by physical vapor deposition method, preparing an intermediate TiC layer by chemical vapor deposition method, preparing a surface TiO2 layer by high-temperature oxidation, and preparing a hydrophobic and oleophobic layer by chemical vapor deposition method. And through multi-layer titanium plating, a Ti layer is formed in contact with the stainless steel bottom layer, a TiC layer is formed in the middle, and a TiO2 layer is formed on the surface layer. By utilizing the complementary characteristics of each layer of materials, better corrosion resistance and wear resistance are achieved, and then the hydrophobic and oleophobic properties of the TiO2 surface layer are enhanced by chemical vapor deposition of fluoride.

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

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

[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 soak and 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 the residual alkaline substance. 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-based polishing solution on the stainless-steel surface and then polish 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 the residual polishing solution and pollutants, and then thoroughly rinse with clean water to remove the 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 for heating in step (4) is 10 -3 -10 -5 Pa, the heating temperature is 200-500°C, 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 to introduce argon in a vacuum with a pressure of 10 -3 -10 -5 Pa, start the ion source device to generate an ion beam with an energy of 200-500V, and bombard 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 to heat high-purity titanium to 1500-1800°C in a vacuum condition with a pressure of 10 -5 -10 - 7 Torr to evaporate it into titanium atoms or titanium ions and deposit them on the stainless-steel surface as a Ti layer.

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

[0014] As a preferred technical solution of the present invention, the surface TiO2 layer in step (8) is to expose the TiC layer in 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 a TiO2 fluoride layer with hydrophobic and oleophobic properties obtained on the stainless-steel surface by introducing hexafluoropropylene gas into the reaction chamber at 150-250 °C through a chemical vapor deposition device and depositing for 1-3 hours.

[0016] Advantages of the present invention:

[0017] (1) By multi-layer titanium plating, a Ti layer is formed in contact with the stainless-steel bottom layer, 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, ensuring a strong bond between the coating and the stainless-steel substrate, and avoiding peeling or cracking of the subsequent coating caused by surface defects of the substrate; then, the TiC layer with higher hardness provides excellent hardness and wear resistance, and uses the difference in buffer thermal expansion coefficients to reduce stress accumulation between different materials during temperature changes, avoiding cracking of the coating layer; finally, the TiO2 layer provides wear resistance and corrosion resistance, and at the same time improves the oxidation resistance of the coating.

[0018] (2) Utilizing the low surface energy characteristics of fluoride, a chemically bonded fluoride layer is formed on the surface of TiO2, reducing the free energy of the TiO2 surface, making the liquid form a larger contact angle on the surface, showing hydrophobic and oleophobic properties, and thus achieving the effects of anti-fouling and easy cleaning of stainless-steel tableware. Specific embodiments

[0019] To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with embodiments, details the specific embodiments, structures, features and their effects according to the present invention as follows.

[0020] Embodiment 1

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

[0022] The substrate pretreatment in step (1) includes degreasing, rust removal, and polishing; first, soak the stainless steel surface in a 3% NaOH solution at 50°C for 5 minutes, wipe it to remove grease and other organic contaminants, then rinse it with clean water to remove the residual alkaline substances. Next, immerse the stainless steel in an 8% hydrochloric acid solution for 6 minutes and then wash off the residual acid. Add 1 part by weight of deionized water to an acid-resistant container, slowly add 2 parts by weight of 85% phosphoric acid solution to the water while stirring continuously, and finally slowly add 1 part by weight of 98% sulfuric acid solution to prepare a phosphoric acid-based polishing solution. Apply the phosphoric acid-based polishing solution evenly on the stainless steel surface and then polish it with a polishing machine for 8 minutes.

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

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

[0025] The vacuum pressure for heating under vacuum in step (4) is 10 -4 Pa, and heat it at a heating temperature of 300°C for 2 hours.

[0026] The ion bombardment cleaning in step (5) is to introduce argon under a vacuum of 10 -4 Pa, start the ion source device, generate an ion beam with an energy of 300V, and bombard the stainless steel surface for 7 minutes.

[0027] The titanium ion evaporation deposition in step (6) is carried out under a vacuum condition of 10 -6 Torr. Heat high-purity titanium to 1600°C to evaporate it into titanium atoms or titanium ions and deposit a Ti layer with a thickness of 100 nm on the stainless steel surface.

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

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

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

[0031] Example 2

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

[0033] The substrate pretreatment in step (1) includes degreasing, rust removal, and polishing; first, soak the stainless steel surface in a 3% NaOH solution at 40°C for 5 minutes, wipe the surface to remove grease and other organic pollutants, then rinse with clean water to remove the residual alkaline substances. Next, immerse the stainless steel in an 8% hydrochloric acid solution for 6 minutes and then wash off the residual acid. Add 1 part by weight of deionized water to an acid-resistant container, slowly add 2 parts by weight of 85% phosphoric acid solution to the water while stirring continuously, and finally slowly add 1 part by weight of 98% sulfuric acid solution to make a phosphoric acid-based polishing solution. Apply the phosphoric acid-based polishing solution evenly on the stainless steel surface and then polish with a polishing machine for 5 minutes.

[0034] The chemical cleaning in step (2) is to soak the stainless steel in a 1% NaOH solution for 5 minutes to further remove the residual polishing solution and pollutants, then thoroughly rinse 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 for heating in the vacuum environment in step (4) is 10 -4 Pa, and heat at a temperature of 300°C for 2 hours.

[0037] The ion bombardment cleaning in step (5) is to introduce argon under a vacuum of 10 -4 Pa, start the ion source device to generate an ion beam with an energy of 300V, and bombard the stainless steel surface for 7 minutes.

[0038] The titanium ion evaporation deposition in step (6) is to heat high-purity titanium to 1700°C to evaporate into titanium atoms or titanium ions and deposit them on the stainless steel surface as a Ti layer with a thickness of 100 nm under a vacuum condition of 10 -6 Torr.

[0039] The intermediate TiC layer in step (7) is formed by chemical vapor deposition. At 900°C, a mixed gas of titanium halide TiCl4 and carbon source gas CH4 reacts on the surface of the Ti layer to form a 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, causing the surface of the TiC layer to oxidize and form a TiO2 layer with a thickness of 100 nm.

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

[0042] Comparative Example 1

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

[0044] The substrate pretreatment in step (1) includes degreasing, rust removal and polishing; first soak the stainless steel surface in a 3% NaOH solution at 50 °C for 5 minutes and wipe to remove grease and other organic pollutants, then rinse with clean water to remove the remaining alkaline substances, then immerse the stainless steel in an 8% hydrochloric acid solution for 6 minutes and wash off the remaining acid. Add 1 part by weight of deionized water to an acid-resistant container, then slowly add 2 parts by weight of 85% phosphoric acid solution to the water and stir continuously, and finally slowly add 1 part by weight of 98% sulfuric acid solution to make a phosphoric acid-based polishing solution. Apply the phosphoric acid-based polishing solution evenly on the stainless steel surface and polish with a polishing machine for 8 minutes.

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

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

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

[0048] The ion bombardment cleaning in step (5) is to introduce argon under a vacuum of 10 -4 Pa, start the ion source device after introducing argon, generate an ion beam with an energy of 300 V, and bombard 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 a vacuum condition of Torr, high-purity titanium is heated to 1600 °C to evaporate into titanium atoms or titanium ions and deposited on the stainless-steel surface to form a Ti layer with a thickness of 250 nm.

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

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

[0052] Comparative Example 2

[0053] A surface treatment method for a stainless-steel coated tableware, characterized by comprising the following steps: (1) substrate pretreatment, (2) chemical cleaning, (3) activation treatment, (4) heating under a 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 described in step (1) includes degreasing, rust removal, and polishing; first, soak the stainless-steel surface in a 3% NaOH solution at 50 °C for 5 minutes, wipe it to remove grease and other organic pollutants, then rinse it with clear water to remove the remaining alkaline substances, then immerse the stainless-steel in an 8% hydrochloric acid solution for 6 minutes and wash off the remaining acid. Add 1 part by weight of deionized water to an acid-resistant container, then slowly add 2 parts by weight of 85% phosphoric acid solution to the water and stir continuously, and finally slowly add 1 part by weight of 98% sulfuric acid solution to make a phosphoric acid-based polishing solution. Use the phosphoric acid-based polishing solution to evenly coat the stainless-steel surface and then polish it with a polishing machine for 8 minutes.

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

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

[0057] The vacuum pressure for heating under a vacuum environment described in step (4) is 10 -4 Pa, and the heating temperature is 300 °C and heated for 2 hours.

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

[0059] The intermediate TiC layer described in step (6) is formed by chemical vapor deposition. At 900°C, the mixed gas of titanium halide TiCl4 and carbon source gas CH4 reacts on the surface of the Ti layer to form a TiC with a thickness of 500nm.

[0060] The surface TiO2 layer described 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 a TiO2 with a thickness of 100nm.

[0061] The hydrophobic and oleophobic layer described in step (8) is obtained by introducing hexafluoropropylene gas into the reaction chamber at 200°C through a chemical vapor deposition device and depositing for 2 hours, so that the stainless-steel surface obtains a hydrophobic and oleophobic TiO2 fluoride layer.

[0062] Comparative Example 3

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

[0064] The substrate pretreatment described in step (1) includes degreasing, rust removal, and polishing; first, soak the stainless-steel surface in a 3% NaOH solution at 50°C for 5 minutes, wipe it to remove grease and other organic pollutants, then rinse with clear water to remove the remaining alkaline substances. Then immerse the stainless-steel in an 8% hydrochloric acid solution for 6 minutes and wash off the remaining acid. Add 1 part by weight of deionized water to an acid-resistant container, then slowly add 2 parts by weight of 85% phosphoric acid solution to the water and stir continuously. Finally, slowly add 1 part by weight of 98% sulfuric acid solution to make a phosphoric acid-based polishing solution. Apply the phosphoric acid-based polishing solution evenly on the stainless-steel surface and polish with a polishing machine for 8 minutes.

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

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

[0067] The vacuum pressure for heating under the vacuum environment described in step (4) is 10 -4 Pa, and heat for 2 hours at a heating temperature of 300°C.

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

[0069] The titanium ion evaporation deposition described in step (6) is carried out under a vacuum condition of 10 -6 Torr. Heat high-purity titanium to 1600 °C to evaporate it into titanium atoms or ions and deposit it on the stainless steel surface to form a Ti layer with a thickness of 100 nm.

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

[0071] Comparative Example 4

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

[0073] The substrate pretreatment described in step (1) includes degreasing, rust removal and polishing; first soak the stainless steel surface in a 3% NaOH solution at 50 °C for 5 minutes, wipe it to remove grease and other organic pollutants, then rinse it with clean water to remove the remaining alkaline substances, then immerse the stainless steel in an 8% hydrochloric acid solution for 6 minutes, wash off the remaining acid, add 1 part by weight of deionized water to an acid-resistant container, then slowly add 2 parts by weight of 85% phosphoric acid solution to the water and stir continuously, and finally slowly add 1 part by weight of 98% concentrated sulfuric acid solution to make a phosphoric acid-based polishing solution. Use the phosphoric acid-based polishing solution to evenly coat the stainless steel surface and then polish it with a polishing machine for 8 minutes.

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

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

[0076] The vacuum pressure for heating under the vacuum environment described in step (4) is 10 -4 Pa, and the heating temperature is 300 °C and heated for 2 hours.

[0077] The ion bombardment cleaning described in step (5) is to introduce argon gas under 10 -4 Pa vacuum, start the ion source device to generate an ion beam with an energy of 300 V and bombard the stainless steel surface for 7 minutes.

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

[0079] Comparative Example 5

[0080] A surface treatment method for stainless-steel coated tableware, characterized by comprising 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, (7) preparing an intermediate TiC layer by chemical vapor deposition, and (8) preparing a surface TiO2 layer by high-temperature oxidation.

[0081] The substrate pretreatment in step (1) includes degreasing, rust removal, and polishing; first soaking the stainless steel in a 3% NaOH solution at 50 °C for 5 minutes and wiping the stainless-steel surface to remove grease and other organic pollutants, then rinsing with clean water to remove the residual alkaline substances, then immersing the stainless steel in an 8% hydrochloric acid solution for 6 minutes and washing off the residual acid, adding 1 part by weight of deionized water to an acid-resistant container, then slowly adding 2 parts by weight of 85% phosphoric acid solution to the water and continuously stirring, and finally slowly adding 1 part by weight of 98% concentrated sulfuric acid solution to prepare a phosphoric acid-based polishing solution. After uniformly applying the phosphoric acid-based polishing solution on the stainless-steel surface, it is polished with a polishing machine for 8 minutes.

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

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

[0084] The heating under a vacuum environment in step (4) has a vacuum pressure of 10 -4 Pa, and is heated at a heating temperature of 300 °C for 2 hours.

[0085] The ion bombardment cleaning in step (5) is introducing argon under a vacuum of 10 -4 Pa, starting the ion source device after introducing argon, generating an ion beam with an energy of 300 V, and bombarding the stainless-steel surface for 7 minutes.

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

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

[0088] The surface TiO2 layer described 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 a TiO2 layer with a thickness of 100 nm.

[0089] Performance testing

[0090] Wear resistance testing is carried out according to the ASTM D4060 Taber abrasion test standard, with the unit of mg / 1000 revolutions, indicating the mass loss after 1000 revolutions of abrasion.

[0091] Corrosion resistance testing is carried out according to the ASTM G48 pitting corrosion test standard, with the unit of μm.

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

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

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

[0095] It can be seen from the test results that in the present invention, a Ti layer is formed in contact with the stainless steel bottom layer through multi-layer titanium plating, a TiC layer is formed in the middle, and a TiO2 layer is formed on the surface. By utilizing the complementary characteristics of each layer of materials, better corrosion resistance and wear resistance are achieved.

[0096] By utilizing the low surface energy characteristics of fluoride, a chemically bonded fluorinated layer is formed on the surface of TiO2, reducing the free energy of the TiO2 surface, enabling a larger contact angle of the liquid on the surface, and showing better hydrophobic and oleophobic characteristics, thereby achieving the effects of anti-fouling and easy cleaning of the stainless steel tableware.

[0097] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments with equivalent changes, but as long as the content of the technical solution of the present invention is not departed from, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall 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 It includes the following steps: (1) Substrate pretreatment, (2) Chemical cleaning, (3) Activation treatment, (4) Heating in a vacuum environment, (5) Ion bombardment cleaning, (6) Preparing the bottom Ti layer by physical vapor deposition, (7) Preparing the intermediate TiC layer by chemical vapor deposition, (8) Preparing the surface TiO2 layer by high-temperature oxidation, (9) Preparing the hydrophobic and oleophobic layer by chemical vapor deposition; The intermediate TiC layer in step (7) is formed by using chemical vapor deposition to react a mixed gas of titanium halide TiCl4 and carbon source gas CH4 at 800 - 1000 °C on the surface of the Ti layer to form TiC.

2. A surface treatment method for a 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 soak and 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 the residual alkaline substance, 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, and the polishing is to evenly apply a phosphoric acid-based polishing solution on the stainless steel surface and then polish with a polishing machine for 5 - 15 minutes.

3. A surface treatment method for a 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 the residual polishing solution and pollutants, and then thoroughly rinse with clean water to remove the residual solution and dry.

4. A surface treatment method for a 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. A surface treatment method for a 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. A surface treatment method for a stainless steel coated tableware according to claim 1, characterized in that: The ion bombardment cleaning described in step (5) is to introduce argon gas under a vacuum of 10 -3 - 10 -5 Pa, start the ion source device after that, generate an ion beam with an energy of 200 - 500 V, and bombard the stainless steel surface for 5 - 10 minutes.

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

8. A surface treatment method for a 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 in a high-temperature oxygen environment to oxidize the surface of the TiC layer to form TiO2.

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

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