A wear-resistant duplex stainless steel strip and its processing technology

Abstract

The present invention relates to the technical field of stainless steel strips, and specifically discloses a wear-resistant duplex stainless steel strip and its processing technology; specifically including the following steps: S1: Electroplate an iron-nickel-copper layer on the surface of the duplex stainless steel strip to obtain stainless steel strip A; the plating solution includes the following components: 40-50 g / L nickel sulfate hexahydrate, 20-30 g / L ferric sulfate, 30-40 g / L copper sulfate pentahydrate, 35-45 g / L sodium citrate dihydrate, 25-30 g / L sodium acetate, 20-25 g / L sodium hypophosphite; S2: Take silicone resin, hydrogen-containing silicone oil, ethanol, nano-silicon carbide, and corrosion-resistant antibacterial agent, mix them evenly to obtain a corrosion-resistant antibacterial coating; S3: Coat the corrosion-resistant antibacterial coating on the surface of stainless steel strip A and dry it at room temperature to obtain stainless steel strip B with a corrosion-resistant antibacterial coating on the surface; coat gallium-containing zinc oxide sol on the surface of stainless steel strip B and perform heat treatment to obtain a wear-resistant duplex stainless steel strip with a gallium-containing zinc oxide layer on the surface.

Description

Technical Field

[0001] The present invention relates to the technical field of stainless steel strips, and specifically discloses a wear-resistant duplex stainless steel strip and its processing technology. Background Art

[0002] The stainless steel strip made of duplex stainless steel combines the characteristics of ferritic stainless steel and austenitic stainless steel, and its mechanical properties and corrosion resistance are superior to those of traditional austenitic and ferritic stainless steels. With the continuous development of the economy and the continuous improvement of people's living quality, better performance of stainless steel strips is required.

[0003] In order to improve the antibacterial ability of stainless steel strips, copper is often introduced into duplex stainless steel; however, whether copper elements are introduced into the stainless steel matrix or copper is plated on the surface, it will lead to a decline in properties such as corrosion resistance and surface wear resistance, affecting the performance and service life of the product. And there are problems with poor bonding force when coating a corrosion-resistant and antibacterial coating on the surface. Therefore, it is of great significance to study a wear-resistant duplex stainless steel strip with good corrosion resistance and antibacterial properties and its processing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a wear-resistant duplex stainless steel strip and its processing technology to solve the problems raised in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A processing technology for a wear-resistant duplex stainless steel strip, including the following steps: S1: Electroplate an iron-nickel-copper layer on the surface of the duplex stainless steel strip to obtain stainless steel strip A;

[0006] S2: Take silicone resin, hydrogen-containing silicone oil, ethanol, nano-silicon carbide, and a corrosion-resistant and antibacterial agent, mix them evenly to obtain a corrosion-resistant and antibacterial coating;

[0007] S3: Coat the corrosion-resistant and antibacterial coating on the surface of stainless steel strip A, ventilate and dry at room temperature for 2 - 3 days to obtain stainless steel strip B with a corrosion-resistant and antibacterial coating on the surface; Coat gallium-containing zinc oxide sol on the surface of stainless steel strip B and perform heat treatment to obtain a wear-resistant duplex stainless steel strip with a gallium-containing zinc oxide layer on the surface.

[0008] Preferably, the heat treatment includes the following steps: Treat at 90 - 100 °C for 4 - 6 h, and treat at 200 - 220 °C for 25 - 30 min.

[0009] Preferably, the electroplating process is: pH = 7 - 8, temperature 55 - 60 °C, direct current 3 - 5 A / dm 3, time is 20 - 30 min; The plating solution used for electroplating includes the following components: 40 - 50 g / L nickel sulfate hexahydrate, 20 - 30 g / L ferric sulfate, 30 - 40 g / L copper sulfate pentahydrate, 35 - 45 g / L sodium citrate dihydrate, 25 - 30 g / L sodium acetate, 20 - 25 g / L sodium hypophosphite.

[0010] Preferably, the corrosion - resistant and antibacterial coating includes the following raw materials, by mass: 75 - 85 parts of silicone resin, 10 - 15 parts of hydrogen - containing silicone oil, 10 - 15 parts of ethanol, 25 - 35 parts of nano - silicon carbide, 10 - 15 parts of corrosion - resistant and antibacterial agent.

[0011] Preferably, the preparation of the corrosion - resistant and antibacterial agent includes the following steps: Step 1: Add hexadecylamine and aluminum dihydrogen tripolyphosphate into water, add a mixed solution of water and organic amine, stir at room temperature for 1 - 2 h, filter, wash, dry and grind to obtain hexadecylamine - intercalated aluminum dihydrogen tripolyphosphate;

[0012] Step 2: Take hexadecylamine - intercalated aluminum dihydrogen tripolyphosphate and ether, pressurize and heat to 85 - 90 °C and stir evenly, add 3,4 - dihydroxycinnamaldehyde, stir for 30 - 40 min, add glacial acetic acid, react for 4 - 6 h, remove the solvent to obtain an intermediate;

[0013] Step 3: Take the intermediate, 5,6 - dibromobenzimidazole, guar gum hydroxypropyltrimethylammonium chloride, and sodium carbonate, add them into ethanol and stir evenly, stir at 70 - 78 °C for 5 - 7 h, remove the solvent to obtain the corrosion - resistant and antibacterial agent.

[0014] Preferably, the hexadecylamine - intercalated aluminum dihydrogen tripolyphosphate includes the following raw materials, by mass: 2 - 3 parts of hexadecylamine, 3 - 4 parts of aluminum dihydrogen tripolyphosphate, 20 - 30 parts of mixed solution; The mixed solution is a mixed solution of water and organic amine with a volume ratio of (3 - 4):1;

[0015] The intermediate includes the following raw materials, by mass: 8 - 10 parts of hexadecylamine - intercalated aluminum dihydrogen tripolyphosphate, 4 - 6 parts of 3,4 - dihydroxycinnamaldehyde, 2 - 3 parts of glacial acetic acid;

[0016] The corrosion - resistant and antibacterial agent includes the following raw materials, by mass: 4 - 5 parts of intermediate, 4.5 - 6 parts of 5,6 - dibromobenzimidazole, 2 - 3 parts of guar gum hydroxypropyltrimethylammonium chloride, 2 - 3 parts of sodium carbonate.

[0017] Preferably, the mixed solution is a mixed solution of water and n - propylamine solution with a volume ratio of 3:1.

[0018] Preferably, the preparation of the gallium-containing zinc oxide sol comprises the following steps: taking zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stirring evenly at 50-60 °C, and aging for 24-25 h to obtain the gallium-containing zinc oxide sol; in the gallium-containing zinc oxide sol, the concentration of zinc nitrate is 0.1-0.15 mol / L, the concentration of gallium nitrate is 0.002-0.003 mol / L, and the concentration of zinc acetylacetonate is 0.1-0.15 mol / L.

[0019] Preferably, after the gallium-containing zinc oxide sol is modified to obtain a modified gallium-containing zinc oxide sol and then coated, the preparation of the modified gallium-containing zinc oxide sol comprises the following steps: adding vinyltriethoxysilane to water, stirring evenly, adding the gallium-containing zinc oxide sol, stirring at 45-50 °C for 4-6 h, adding a platinum catalyst, and stirring evenly to obtain the modified gallium-containing zinc oxide sol.

[0020] Preferably, the modified gallium-containing zinc oxide sol comprises the following raw materials, by mass: 2-4 parts of vinyltriethoxysilane, 10-15 parts of water, 100-110 parts of gallium-containing zinc oxide sol, and 0.006-0.008 parts of platinum catalyst.

[0021] Preferably, the thickness of the corrosion-resistant and antibacterial coating is 10-15 μm; the thickness of the gallium-containing zinc oxide layer is 60-80 nm.

[0022] Preferably, the composition of the duplex stainless steel strip is by mass percentage: C 0.001-0.002%; Cr 23-25%; Mn 8-9%; N 0.5-0.7%; Ni 0.001-0.005%; the balance is iron and other inevitable impurities.

[0023] Preferably, the thickness of the duplex stainless steel strip is 0.5-0.8 mm.

[0024] Preferably, the thickness of the duplex stainless steel strip is 0.6 mm.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: First, an iron-nickel-copper layer is plated on the surface of the duplex stainless steel strip to obtain stainless steel strip A; due to the presence of iron and nickel, the coating has good adhesion to the duplex stainless steel strip and the coating is flat. Taking this layer as a primer layer is beneficial to the progress of subsequent steps; copper has antibacterial effects, but the antibacterial effect is not good when the bacteria concentration is high, and its corrosion resistance and wear resistance need to be further improved;

[0026] Apply a corrosion-resistant and antibacterial coating on the surface of the stainless steel strip A to obtain the stainless steel strip B with a corrosion-resistant and antibacterial coating on its surface. Among them: Aluminum dihydrogen tripolyphosphate can release tripolyphosphate ions with strong complexing ability, has a strong binding force with the metal layer, and can form a dense corrosion-resistant film. Intercalate hexadecylamine into it to introduce amino groups, enabling it to participate in the subsequent reaction with the aldehyde group of 3,4-dihydroxycinnamaldehyde. First, the hydrophilic aldehyde group combines with the hydrophobic long carbon chain alkyl group of hexadecylamine to form an amphiphilic structure, which can be more effectively bound to the bacterial surface layer, enhancing the antibacterial effect. Moreover, 3,4-dihydroxycinnamaldehyde can also provide corrosion-resistant and antibacterial effects. In the next step of modification, introduce 5,6-dibromobenzimidazole and guar gum hydroxypropyltrimethyl ammonium chloride; The benzimidazole structure has both corrosion inhibition and antibacterial effects; On the one hand, guar gum hydroxypropyltrimethyl ammonium chloride acts as a dispersant to improve the overall dispersibility and can further enhance the antibacterial ability. At the same time, it can act as a thickener to adjust the viscosity; In summary, this corrosion-resistant and antibacterial agent has good corrosion-resistant and antibacterial effects, and has good dispersibility in the corrosion-resistant and antibacterial coating and good binding property with the metal layer;

[0027] In order to further improve the antibacterial property and wear resistance, a gallium-containing zinc oxide sol is introduced; When gallium precipitates ions, it can effectively inhibit the proliferation activity of bacteria. However, adding it to the stainless steel matrix may lead to a decline in hot working performance and cold forming performance; Electroplating of gallium is difficult. If introduced by electroplating, the uneven coating will instead cause a decline in corrosion-resistant and wear-resistant properties. Therefore, in this invention, it is combined with zinc oxide and then sprayed onto the surface of the stainless steel strip; Since the gallium-containing zinc oxide sol of this invention is modified by vinyltriethoxysilane and contains double bonds, and a hydrogen-containing silicone oil is added to the upper layer of the corrosion-resistant and antibacterial layer, the two can undergo an addition reaction under the catalysis of a platinum catalyst during heat treatment, improving the binding force between the two layers, and improving the antibacterial property of the stainless steel strip while enhancing the wear resistance. Specific embodiments

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] Unless otherwise specified, the following parts are by mass;

[0030] The composition of the duplex stainless steel strip is by mass percentage: C 0.001%; Cr 24%; Mn 8.5%; N 0.5%; Ni 0.002%; The balance is iron and other inevitable impurities;

[0031] Electroplating process: The temperature is 60 °C, and the direct current density is 4 A / dm 3Under the following conditions, the plating time is 25 min; the plating solution contains the following components: 45 g / L nickel sulfate hexahydrate, 25 g / L iron sulfate, 38 g / L copper sulfate pentahydrate, 42 g / L sodium citrate dihydrate, 28 g / L sodium acetate, 25 g / L sodium hypophosphite; pH = 7;

[0032] Example 1: S1: Electroplate an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0033] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; the concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0034] S3: Take 3 parts of vinyltriethoxysilane, add 12 parts of water, stir at 50 °C for 0.5 h, add 100 parts of the gallium-containing zinc oxide sol, stir at 50 °C for 5 h, add 0.008 parts of a platinum catalyst, and stir evenly to obtain a modified gallium-containing zinc oxide sol;

[0035] S4: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0036] S5: Take 10 parts of hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and 150 parts of ether, pressurize and heat to 90 °C and stir evenly, add 6 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 3 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate; take 5 parts of the intermediate, 5 parts of 5,6-dibromobenzimidazole, 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and 3 parts of sodium carbonate, add to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant and antibacterial agent;

[0037] S6: Take 80 parts of an organosilicon resin, 12 parts of a hydrogen-containing silicone oil, 15 parts of ethanol, 30 parts of nano-silicon carbide, and 12 parts of the corrosion-resistant and antibacterial agent, and mix evenly to obtain a corrosion-resistant and antibacterial coating;

[0038] S7: Coat the corrosion-resistant and antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant and antibacterial coating with a thickness of 12 μm, dry at room temperature and ventilate for 2 days to obtain stainless steel strip B; coat the modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat at 95 °C for 6 h, and treat at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 70 nm to obtain a wear-resistant duplex stainless steel strip.

[0039] Example 2: S1: Electroplate an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0040] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; the concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0041] S3: Take 2 parts of vinyltriethoxysilane, add it to 10 parts of water, stir at 50 °C for 0.5 h, add 100 parts of the gallium-containing zinc oxide sol, stir at 50 °C for 5 h, add 0.008 parts of a platinum catalyst, and stir evenly to obtain a modified gallium-containing zinc oxide sol;

[0042] S4: Add 2 parts of hexadecylamine and 3 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0043] S5: Take 8 parts of hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and 150 parts of diethyl ether, pressurize and heat to 90 °C and stir evenly, add 4 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 2 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate; take 4 parts of the intermediate, 4.5 parts of 5,6-dibromobenzimidazole, 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and 2 parts of sodium carbonate, add them to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant and antibacterial agent;

[0044] S6: Take 85 parts of silicone resin, 10 parts of hydrogen-containing silicone oil, 15 parts of ethanol, 30 parts of nano-silicon carbide, and 15 parts of the corrosion-resistant and antibacterial agent, and mix evenly to obtain a corrosion-resistant and antibacterial coating;

[0045] S7: Coat the corrosion-resistant and antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant and antibacterial coating with a thickness of 12 μm, dry at room temperature and ventilate for 2 days to obtain stainless steel strip B; coat the modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat at 95 °C for 6 h, and treat at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 70 nm to obtain a wear-resistant duplex stainless steel strip.

[0046] Example 3: S1: Electroplate an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0047] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; the concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0048] S3: Take 4 parts of vinyltriethoxysilane, add it to 15 parts of water, stir at 50 °C for 0.5 h, add 100 parts of gallium-containing zinc oxide sol, stir at 50 °C for 5 h, add 0.008 parts of platinum catalyst, and stir evenly to obtain a modified gallium-containing zinc oxide sol;

[0049] S4: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0050] S5: Take 10 parts of hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and 150 parts of ether, pressurize and heat to 90 °C and stir evenly, add 6 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 3 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate; Take 5 parts of the intermediate, 6 parts of 5,6-dibromobenzimidazole, 3 parts of guar gum hydroxypropyltrimethylammonium chloride, and 3 parts of sodium carbonate, add them to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant and antibacterial agent;

[0051] S6: Take 75 parts of silicone resin, 15 parts of hydrogen-containing silicone oil, 15 parts of ethanol, 35 parts of nano-silicon carbide, and 10 parts of the corrosion-resistant and antibacterial agent, mix evenly to obtain a corrosion-resistant and antibacterial coating;

[0052] S7: Coat the corrosion-resistant and antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant and antibacterial coating with a thickness of 12 μm, ventilate and dry at room temperature for 2 days to obtain stainless steel strip B; Coat the modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat at 95 °C for 6 h, and treat at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 70 nm to obtain a wear-resistant duplex stainless steel strip.

[0053] Comparative Example 1 (using unmodified gallium-containing zinc oxide sol and replacing hydrogen-containing silicone oil with silicone resin, and the rest of the method steps are the same as those in Example 1): S1: Electroplate an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0054] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; The concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0055] S3: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0056] S4: Take 10 parts of hexadecylamine intercalated aluminum dihydrogen triphosphate and 150 parts of diethyl ether, pressurize and heat to 90 °C and stir evenly. Add 6 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 3 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate. Take 5 parts of the intermediate, 5 parts of 5,6-dibromobenzimidazole, 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and 3 parts of sodium carbonate, add them to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant antibacterial agent;

[0057] S5: Take 92 parts of silicone resin, 15 parts of ethanol, 30 parts of nano silicon carbide, and 12 parts of the corrosion-resistant antibacterial agent, mix evenly to obtain a corrosion-resistant antibacterial coating;

[0058] S6: Coat the corrosion-resistant antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant antibacterial coating with a thickness of 12 μm, ventilate and dry at room temperature for 2 days to obtain stainless steel strip B. Coat a modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat it at 95 °C for 6 h and at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 70 nm to obtain a wear-resistant duplex stainless steel strip.

[0059] Comparative Example 2 (electroplating an iron-nickel-copper-gallium-zinc layer on the surface of a stainless steel strip without using a gallium-containing zinc oxide layer, and the remaining method steps are the same as those in Example 1): S1: Electroplate an iron-nickel-copper-gallium-zinc layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0060] Electroplating process: The temperature is 60 °C, the direct current density is 4 A / dm 3 Under this condition, the plating time is 25 min; the plating solution includes the following components: 45 g / L nickel sulfate hexahydrate, 25 g / L ferric sulfate, 38 g / L copper sulfate pentahydrate, 42 g / L sodium citrate dihydrate, 5 g / L gallium chloride, 10 g / L zinc sulfate, 28 g / L sodium acetate, 25 g / L sodium hypophosphite; pH = 7;

[0061] S2: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen triphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen triphosphate;

[0062] S3: Take 10 parts of hexadecylamine intercalated aluminum dihydrogen triphosphate and 150 parts of diethyl ether, pressurize and heat to 90 °C and stir evenly. Add 6 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 3 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate. Take 5 parts of the intermediate, 5 parts of 5,6-dibromobenzimidazole, 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and 3 parts of sodium carbonate, add them to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant antibacterial agent;

[0063] S4: Take 80 parts of silicone resin, 12 parts of hydrogen-containing silicone oil, 15 parts of ethanol, 30 parts of nano silicon carbide, and 12 parts of corrosion-resistant antibacterial agent, mix them evenly to obtain a corrosion-resistant antibacterial coating;

[0064] S5: Coat the corrosion-resistant antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant antibacterial coating with a thickness of 12 μm. Dry it at room temperature with ventilation for 2 days, treat it at 95 °C for 6 h, and treat it at 220 °C for 30 min to obtain a wear-resistant duplex stainless steel strip.

[0065] Comparative Example 3 (changing the preparation method of the corrosion-resistant antibacterial agent, and the other method steps are the same as those in Example 1): S1: Electroplate an iron-nickel-copper layer on the surface of the duplex stainless steel strip to obtain stainless steel strip A;

[0066] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir them evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; the concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0067] S3: Take 3 parts of vinyltriethoxysilane, add it to 12 parts of water, stir at 50 °C for 0.5 h, add 100 parts of gallium-containing zinc oxide sol, stir at 50 °C for 5 h, add 0.008 parts of platinum catalyst, and stir evenly to obtain a modified gallium-containing zinc oxide sol;

[0068] S4: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0069] S5: Take the hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and 3,4-dihydroxycinnamaldehyde with a mass ratio of 5:3 and mix them to obtain an intermediate; take 5 parts of the intermediate, 5 parts of 5,6-dibromobenzimidazole, and 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and mix them evenly to obtain a corrosion-resistant antibacterial agent;

[0070] S6: Take 80 parts of silicone resin, 12 parts of hydrogen-containing silicone oil, 15 parts of ethanol, 30 parts of nano silicon carbide, and 12 parts of corrosion-resistant antibacterial agent, mix them evenly to obtain a corrosion-resistant antibacterial coating;

[0071] S7: Coat the corrosion-resistant antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant antibacterial coating with a thickness of 12 μm. Dry it at room temperature with ventilation for 2 days to obtain stainless steel strip B; coat the modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat it at 95 °C for 6 h, and treat it at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 70 nm to obtain a wear-resistant duplex stainless steel strip.

[0072] Comparative Example 4 (changing the corrosion-resistant antibacterial coating and the thickness of the gallium-containing zinc oxide layer, and the remaining method steps are the same as those in Example 1): S1: Electroplate an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain stainless steel strip A;

[0073] S2: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 60 °C, and age for 24 h to obtain a gallium-containing zinc oxide sol; the concentration of zinc nitrate in the formulated solution is 0.1 mol / L, the concentration of gallium nitrate is 0.002 mol / L, and the concentration of zinc acetylacetonate is 0.1 mol / L;

[0074] S3: Take 3 parts of vinyltriethoxysilane, add 12 parts of water, stir at 50 °C for 0.5 h, add 100 parts of the gallium-containing zinc oxide sol, stir at 50 °C for 5 h, add 0.008 parts of a platinum catalyst, and stir evenly to obtain a modified gallium-containing zinc oxide sol;

[0075] S4: Add 3 parts of hexadecylamine and 4 parts of aluminum dihydrogen tripolyphosphate to 15 parts of water, add 30 parts of the mixed solution, stir at room temperature for 2 h, filter, wash, dry, and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate;

[0076] S5: Take 10 parts of hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and 150 parts of diethyl ether, pressurize and heat to 90 °C and stir evenly, add 6 parts of 3,4-dihydroxycinnamaldehyde, stir for 30 min, add 3 parts of glacial acetic acid, react for 6 h, remove the solvent to obtain an intermediate; take 5 parts of the intermediate, 5 parts of 5,6-dibromobenzimidazole, 2 parts of guar gum hydroxypropyltrimethylammonium chloride, and 3 parts of sodium carbonate, add to 100 parts of ethanol and stir evenly, stir at 78 °C for 6 h, remove the solvent to obtain a corrosion-resistant antibacterial agent;

[0077] S6: Take 80 parts of an organosilicon resin, 12 parts of a hydrogen-containing silicone oil, 15 parts of ethanol, 30 parts of nano-silicon carbide, and 12 parts of the corrosion-resistant antibacterial agent, and mix evenly to obtain a corrosion-resistant antibacterial coating;

[0078] S7: Coat the corrosion-resistant antibacterial coating on the surface of stainless steel strip A to obtain a corrosion-resistant antibacterial coating with a thickness of 16 μm, ventilate and dry at room temperature for 2 days to obtain stainless steel strip B; coat the modified gallium-containing zinc oxide sol on the surface of stainless steel strip B, treat at 95 °C for 6 h, and treat at 220 °C for 30 min to obtain a gallium-containing zinc oxide layer with a thickness of 100 nm to obtain a wear-resistant duplex stainless steel strip.

[0079] In the above embodiments, unless otherwise specified, the test methods used are all conventional methods; unless otherwise specified, the raw materials used can be obtained from commercial sources, and the raw material sources are as follows: ethanol (CAS: 64-17-5); sodium carbonate (S24152, Shanghai Yuanye); nickel sulfate hexahydrate (CAS: 10101-97-0); iron sulfate (CAS: 10028-22-5); copper sulfate pentahydrate (CAS: 7758-99-8); sodium citrate dihydrate (CAS: 6132-04-3); sodium acetate (CAS: 127-09-3); sodium hypophosphite (CAS: 10039-56-2); zinc nitrate (CAS: 7779-88-6); zinc acetylacetonate (CAS: 14024-63-6); gallium nitrate (CAS: 13494-90-1); vinyltriethoxysilane (CAS: 78-08-0); diethyl ether (CAS: 60-29-7); 3,4-dihydroxycinnamaldehyde (CAS: 68149-78-0); glacial acetic acid (CAS: 64-19-7); 5,6-dibromobenzimidazole (CAS: 74545-26-9); guar gum hydroxypropyltrimethylammonium chloride (S26747, Shanghai Yuanye); silicone resin (SAR-2, Shanghai Organic Resin Factory); n-propylamine solution (CP, ≥98.5%, Sinopharm Group); platinum catalyst (product number: 8598479, Wuhan Karnos Technology Co., Ltd.); hexadecylamine (CAS: 143-27-1); aluminum dihydrogen tripolyphosphate (CAS: 17375-35-8); hydrogen-containing silicone oil (IOTA616, Anhui Aiyota Silicone Oil Co., Ltd.); nano-silicon carbide (YM-SiC-500Y, Yumu Ningbo New Materials Co., Ltd.).

[0080] Experiment: Take the wear-resistant duplex stainless steel strips prepared in Examples 1 to 3 and Comparative Examples 1 to 4; (1) Detect the antibacterial properties using Escherichia coli and Staphylococcus aureus with a bacterial concentration of 10 CFU / mL; (2) Test the pitting potential; (3) At room temperature, test the wear resistance on an HT-1000 type ball-disk high-temperature friction and wear testing machine, with the counterbody being a Cr15 grinding ball with a diameter of 3.5 mm, a load of 200 N, a time of 20 min, and a motor speed of 560 r / min; the specific data are shown in the following table;

[0081]

[0082] Conclusion: In Comparative Example 1, unmodified gallium-containing zinc oxide sol was used, and silicone resin was used to replace hydrogen-containing silicone oil. Due to the weakened interaction between the two layers, the performance decreased; in Comparative Example 2, an iron-nickel-copper-gallium-zinc layer was electroplated on the surface of the stainless steel strip, and the gallium-containing zinc oxide layer was not used, and the performance was inferior to that of the example; in Comparative Example 3, the preparation method of the corrosion-resistant and antibacterial agent was changed: hexadecylamine intercalated aluminum dihydrogen triphosphate, 3,4-dihydroxycinnamaldehyde, 5,6-dibromobenzimidazole, and guar gum hydroxypropyltrimethylammonium chloride were directly added without compounding, and the performance decreased significantly; in Comparative Example 4, the thickness of the corrosion-resistant and antibacterial coating and the gallium-containing zinc oxide layer was increased, and the performance decreased due to the influence of adhesion, etc.; in summary, the wear-resistant duplex stainless steel strip prepared by the present invention has good wear resistance, antibacterial property, and corrosion resistance.

[0083] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims within the present invention.

Claims

1. A processing technology for wear-resistant duplex stainless steel strip, characterized in that: The following steps are involved: S1: electroplating an iron-nickel-copper layer on the surface of a duplex stainless steel strip to obtain a stainless steel strip A; S2: add hexadecylamine and aluminum dihydrogen tripolyphosphate to water, add a mixed solution of water and organic amine, stir at room temperature for 1-2 hours, filter, wash, dry and grind to obtain hexadecylamine intercalated aluminum dihydrogen tripolyphosphate; take hexadecylamine intercalated aluminum dihydrogen tripolyphosphate and ether, pressurize and heat to 85-90°C and stir evenly, add 3,4-dihydroxycinnamaldehyde, stir for 30-40 minutes, add glacial acetic acid, react for 4-6 hours, remove the solvent to obtain an intermediate; take the intermediate, 5,6-dibromobenzimidazole, guar hydroxypropyltrimethylammonium chloride and sodium carbonate, add to ethanol and stir evenly, stir at 70-78°C for 5-7 hours, remove the solvent to obtain a corrosion-resistant antibacterial agent; take silicone resin, hydrogen-containing silicone oil, ethanol, nano-silicon carbide and corrosion-resistant antibacterial agent, mix evenly to obtain a corrosion-resistant antibacterial coating; S3: Take zinc nitrate, zinc acetylacetonate, gallium nitrate, and ethanol, stir evenly at 50-60°C, and age for 24-25 hours to obtain a gallium-containing zinc oxide sol; add vinyl triethoxysilane to water, stir evenly, add the gallium-containing zinc oxide sol, stir at 45-50°C for 4-6 hours, add a platinum catalyst, stir evenly, and obtain a modified gallium-containing zinc oxide sol; S4: coating the surface of the stainless steel strip A with a corrosion-resistant and antibacterial coating, and drying at room temperature to obtain a stainless steel strip B with a corrosion-resistant and antibacterial coating on the surface; coating the surface of the stainless steel strip B with a modified gallium-containing zinc oxide sol, and heat treating to obtain a wear-resistant duplex stainless steel strip with a gallium-containing zinc oxide layer on the surface; The hexadecylamine intercalated aluminum tripolyphosphate dihydrogen comprises the following raw materials, calculated by weight: 2-3 parts of hexadecylamine, 3-4 parts of aluminum tripolyphosphate dihydrogen, and 20-30 parts of a mixed solution; the mixed solution is a water and organic amine solution in a volume ratio of (3-4):1; the intermediate comprises the following raw materials, calculated by weight: 8-10 parts of hexadecylamine intercalated aluminum tripolyphosphate dihydrogen, 4-6 parts of 3,4-dihydroxycinnamaldehyde, and 2-3 parts of glacial acetic acid; the corrosion-resistant antibacterial agent comprises the following raw materials, calculated by weight: 4-5 parts of the intermediate, 4.5-6 parts of 5,6-dibromobenzimidazole, 2-3 parts of guar gum hydroxypropyltrimethylammonium chloride, and 2-3 parts of sodium carbonate; the corrosion-resistant antibacterial coating comprises the following raw materials, calculated by weight: 75-85 parts of organic silicone resin, 10-15 parts of hydrogenated silicone oil, 10-15 parts of ethanol, 25-35 parts of nano-silicon carbide, and 10-15 parts of corrosion-resistant antibacterial agent; The modified gallium-containing zinc oxide sol comprises the following raw materials, calculated by weight: 2-4 parts of vinyl triethoxysilane, 10-15 parts of water, 100-110 parts of gallium-containing zinc oxide sol, and 0.006-0.008 parts of platinum catalyst; the concentration of zinc nitrate is 0.1-0.15 mol / L, the concentration of gallium nitrate is 0.002-0.003 mol / L, and the concentration of zinc acetylacetonate is 0.1-0.15 mol / L.

2. The processing technology of a wear-resistant duplex stainless steel strip according to claim 1, characterized in that: The electroplating process is as follows: pH = 7-8, temperature 55-60°C, DC current density 3-5A / dm 2 , time 20~30min; the plating solution used for electroplating includes the following components: 40~50g / L nickel sulfate hexahydrate, 20~30g / L ferric sulfate, 30~40g / L copper sulfate pentahydrate, 35~45g / L sodium citrate dihydrate, 25~30g / L sodium acetate, 20~25g / L sodium hypophosphite.

3. The processing technology of a wear-resistant duplex stainless steel strip according to claim 1, characterized in that: The thickness of the corrosion-resistant and antibacterial coating is 10-15 μm; the thickness of the gallium-containing zinc oxide layer is 60-80 nm.

4. The processing technology of a wear-resistant duplex stainless steel strip according to claim 1, characterized in that: The composition of the duplex stainless steel strip is as follows by mass percentage: C 0.001-0.002%; Cr 23-25%; Mn 8-9%; N 0.5-0.7%; Ni 0.001-0.005%; the remainder is iron and other inevitable impurities.

5. A wear-resistant duplex stainless steel strip prepared according to the processing technology of a wear-resistant duplex stainless steel strip according to any one of claims 1 to 4.

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