Ultrathin oxidation-resistant stainless steel strip

Abstract

The application relates to an ultrathin antioxidant stainless steel strip, and relates to the technical field of metal materials, which comprises an ultrathin stainless steel strip base body, an electroplated corrosion-resistant layer and an antioxidant coating, the ultrathin stainless steel strip base body comprises the following components in mass fraction: nickel 2.5-3.5%, aluminum 6-8%, zinc 3.5-4.5%, tin 2-6%, boron 0.05-0.1%, bismuth 0.02-0.05%, cobalt 0.05-0.07%, manganese 1.5-3%, phosphorus 0.02-0.05%, lanthanum 0.06-0.1%, and the balance is iron and inevitable impurities. The ultrathin antioxidant stainless steel strip is prepared by the following steps: preparing an ultrathin stainless steel strip base body; pretreating the ultrathin stainless steel strip base body, immersing the pretreated stainless steel strip into a plating solution for electroplating treatment to obtain a stainless steel strip with an electroplated corrosion-resistant layer; mixing antioxidant paint and a curing agent, and coating the mixture on the surface of the stainless steel strip with the electroplated corrosion-resistant layer; after the coating is dried, heating and curing are carried out to obtain the ultrathin antioxidant stainless steel strip. The application has the effects of improving the antioxidant property, corrosion resistance and tensile strength of the stainless steel strip.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metal materials, in particular to an ultra-thin oxidation-resistant stainless steel strip. BACKGROUND

[0002] The stainless steel strip is a high-performance material and has a wide application prospect in the fields of electronics, precision instruments and medical devices. With the development of industrial technology and the increase of market demand, users have higher requirements for the performance of the material. The material not only needs to have good corrosion resistance and oxidation resistance, but also needs to have high mechanical strength and ultra-thin characteristics to meet the needs of precision manufacturing and lightweight design.

[0003] In the related art, a corrosion-resistant layer such as a metal plating layer or a ceramic plating layer is plated on the surface of a stainless steel base material to improve the oxidation resistance of the material by increasing the surface corrosion resistance. Or the stainless steel base material is modified, such as alloying treatment, that is, an oxidation-resistant element is added to the composition of the stainless steel base material to improve the oxidation resistance. These technologies improve the oxidation resistance of the stainless steel strip to some extent, but the oxidation resistance achieved by single alloying treatment or electroplating treatment is limited, and the prepared stainless steel strip is difficult to maintain good working performance for a long time in extreme environments, and therefore needs to be improved. SUMMARY

[0004] In order to improve the oxidation resistance of the stainless steel strip, the application provides an ultra-thin oxidation-resistant stainless steel strip.

[0005] The ultra-thin oxidation-resistant stainless steel strip provided by the application adopts the following technical scheme:

[0006] An ultra-thin oxidation-resistant stainless steel strip includes an ultra-thin stainless steel strip base body, an electroplated corrosion-resistant layer and an oxidation-resistant coating. The ultra-thin stainless steel strip base body includes the following components in mass fraction: nickel 2.5-3.5%, aluminum 6-8%, zinc 3.5-4.5%, tin 2-6%, boron 0.05-0.1%, bismuth 0.02-0.05%, cobalt 0.05-0.07%, manganese 1.5-3%, phosphorus 0.02-0.05%, lanthanum 0.06-0.1%, and the balance of iron and unavoidable impurities.

[0007] By designing the composition and proportion of elements in the stainless steel strip, the content of harmful elements oxygen and sulfur in the stainless steel strip is effectively reduced, the state of inclusions is improved, and the tensile strength, corrosion resistance and oxidation resistance of the stainless steel strip are improved; the electroplated corrosion-resistant layer is obtained by co-depositing alloy elements on the surface of the stainless steel strip, and the alloy plating layer produces solid solution strengthening through synergistic effect, thereby improving the toughness, oxidation resistance and corrosion resistance of the electroplated corrosion-resistant layer; the oxidation-resistant coating is uniformly and firmly adhered to the surface of the electroplated corrosion-resistant layer, and through the combination of active corrosion protection and passive corrosion protection, the stainless steel strip is effectively protected, the corrosion resistance and oxidation resistance of the stainless steel strip are improved, and the service life of the stainless steel strip is prolonged.

[0008] Preferably, the oxidation-resistant coating is obtained by coating an oxidation-resistant coating on the surface of the electroplated corrosion-resistant layer, and the preparation raw materials of the oxidation-resistant coating include metal organic framework corrosion inhibitor, modified polyvinylidene fluoride, zinc phosphate, epoxy resin and solvent.

[0009] By using metal organic framework to load the corrosion inhibitor, intelligent and controllable release of the corrosion inhibitor can be achieved, the metal organic framework participates in the curing reaction of the coating through the metal cation center and the active site on the organic ligand, becomes part of the coating, has good stability, and can reinforce the defects of the coating and improve the barrier performance of the coating; modified polyvinylidene fluoride has low surface energy and good system compatibility, can improve the hydrophobicity of the surface, reduce the influence of humid environment and corrosion medium on the stainless steel strip, and improve the oxidation resistance; zinc phosphate can synergize with the metal organic framework corrosion inhibitor to play an isolating protective role, isolate oxygen, corrosion medium and moisture, reduce the penetration of electrolyte, and improve the adhesion, durability, oxidation resistance and corrosion resistance of the coating.

[0010] Preferably, the preparation raw materials of the metal organic framework corrosion inhibitor include metal organic framework and corrosion inhibitor, the preparation raw materials of the metal organic framework include benzotriazole, 5-tert-butyl isophthalic acid, zinc nitrate hexahydrate and graphene oxide, and the corrosion inhibitor includes 8-hydroxyquinoline.

[0011] Benzotriazole and 5-tert-butyl resorcylic acid as organic ligand can be combined with zinc ion to form stable metal organic framework material, benzotriazole itself also has good corrosion inhibition performance, through the π-π bond and electrostatic interaction with the metal surface to form a dense adsorption film, play a protective role, inhibit the oxidation, corrosion reaction occurs; graphene oxide has two-dimensional sheet structure, has shielding effect, can provide passive protection effect, by graphene oxide doped metal organic framework material, can make benzotriazole be effectively wrapped protection, make the active protection of corrosion inhibitor and passive protection of graphene oxide combined, improve the durability, oxidation resistance and corrosion resistance of coating; 8-hydroxyquinoline has good corrosion inhibition performance, can be loaded by metal organic framework material, synergistic effect, prolong the time to play the corrosion inhibition effect, improve the oxidation resistance and corrosion resistance of stainless steel strip.

[0012] Preferably, the mass ratio of benzotriazole, 5-tert-butyl resorcylic acid, zinc nitrate hexahydrate and graphene oxide is 0.2:0.19:1:(0.008-0.012).

[0013] The metal organic framework material prepared according to the above mass ratio has good oxidation resistance, corrosion resistance and system compatibility.

[0014] Preferably, the modified polyvinylidene fluoride is prepared by the following steps:

[0015] The polyvinylidene fluoride and sodium hydroxide are dispersed into an ethanol aqueous solution and heated and stirred to obtain a modified solution, and the modified solution is dried under heating to obtain the modified polyvinylidene fluoride.

[0016] By modifying the polyvinylidene fluoride with sodium hydroxide, the system compatibility of the polyvinylidene fluoride can be improved, the modified polyvinylidene fluoride is fully crosslinked with the epoxy resin, and the hydrophobicity of the polymer organic phase in the coating is improved, thereby improving the oxidation resistance.

[0017] Preferably, the ultra-thin antioxidant stainless steel strip is prepared by the following steps:

[0018] An ultra-thin stainless steel strip substrate is prepared; the ultra-thin stainless steel strip substrate is pretreated, polished, degreased, pickled, washed and dried to obtain a pretreated stainless steel strip; the pretreated stainless steel strip is immersed in a plating solution for electroplating treatment to obtain a stainless steel strip with an electroplated corrosion-resistant layer; an antioxidant coating and a curing agent are mixed and coated on the surface of the stainless steel strip with the electroplated corrosion-resistant layer, and after the coating is dried, the coating is cured by heating to obtain an ultra-thin antioxidant stainless steel strip.

[0019] The stainless steel strip prepared according to the above steps has good oxidation resistance, corrosion resistance and high tensile strength.

[0020] Preferably, the electroplated corrosion-resistant layer comprises zinc, nickel, phosphorus and tungsten.

[0021] Preferably, the plating solution comprises zinc sulfate, nickel sulfamate, sodium tungstate, sodium hypophosphite, sodium citrate, boric acid and sodium dodecyl sulfate.

[0022] Zinc, nickel, phosphorus and tungsten elements have good oxidation resistance, and the zinc alloy plating layer obtained by co-deposition of the four elements can play a good corrosion protection role; nickel sulfamate enables nickel ions to be more uniformly dispersed on the surface of the substrate, improving the uniformity of nickel ion deposition; sodium hypophosphite can hinder the charge transfer step during electrodeposition, increase the degree of cathodic polarization, inhibit the rapid growth of crystal nuclei, refine the crystal grains and promote the close packing of the crystal grains.

[0023] Preferably, the electroplated corrosion-resistant layer is prepared by the following steps:

[0024] A lead plate is used as an anode, and a pretreated stainless steel strip is used as a cathode, which are immersed in the plating solution to perform electroplating operation, the temperature and time are controlled, and after electroplating is completed, the stainless steel strip with an electroplated corrosion-resistant layer is obtained after washing with water and drying.

[0025] Preferably, the electroplating temperature is 50-70℃, and the electroplating time is 60-90min.

[0026] The electroplated corrosion-resistant layer prepared according to the above steps and conditions has good compactness and uniformity, and can play a good corrosion protection role.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By designing the composition and ratio of elements in the stainless steel strip, the content of harmful elements oxygen and sulfur in the stainless steel strip is effectively reduced, the state of inclusions is improved, and the tensile strength, corrosion resistance and oxidation resistance of the stainless steel strip are improved; the electroplated corrosion-resistant layer obtains an alloy plating layer by co-depositing alloy elements on the surface of the stainless steel strip, and synergistically produces solid solution strengthening, thereby improving the toughness, oxidation resistance and corrosion resistance of the electroplated corrosion-resistant layer; the oxidation-resistant coating is uniformly and firmly adhered to the surface of the electroplated corrosion-resistant layer, and effectively protects the stainless steel strip by combining the two principles of active corrosion protection and passive corrosion protection, thereby improving the corrosion resistance and oxidation resistance of the stainless steel strip and prolonging the service life of the stainless steel strip.

[0029] 2. By using metal organic framework material to load corrosion inhibitor, intelligent controllable release of corrosion inhibitor can be realized, metal organic framework material participates in the curing reaction of the coating through the metal cation center and the active site on the organic ligand to become part of the coating, has good stability, and can reinforce the defects of the coating and improve the barrier performance of the coating; modified polyvinylidene fluoride has low surface energy and good system compatibility, which can improve the hydrophobicity of the surface, reduce the influence of humid environment and corrosive medium on the stainless steel strip, and improve the oxidation resistance; zinc phosphate can synergize with metal organic framework material corrosion inhibitor to play an isolation protection role, isolate oxygen, corrosive medium and moisture, reduce the penetration of electrolyte, and improve the adhesion, durability and oxidation resistance of the coating.

[0030] 3. Zinc, nickel, phosphorus and tungsten elements have good oxidation resistance, and the zinc alloy coating obtained by co-deposition of the four elements can play a good corrosion protection role; nickel sulfamate makes nickel ions more uniformly dispersed on the surface of the substrate, improving the uniformity of nickel ion deposition; sodium hypophosphite can hinder the charge transfer step during electrodeposition, increase the degree of cathodic polarization, inhibit the rapid growth of crystal nuclei, refine the crystal grains and promote the close packing of the crystal grains. DETAILED DESCRIPTION

[0031] The application discloses an ultrathin antioxidant stainless steel strip, and raw materials used in the application can be obtained through market-purchased raw materials except for special instructions, and the application is further described in detail in combination with embodiments:

[0032] Raw material description: benzotriazole (CAS No. 95-14-7), 5-tert-butyl resorcylic acid (CAS No. 2359-09-3), zinc nitrate hexahydrate (CAS No. 10196-18-6), graphene oxide purchased from Jiangsu Xianfeng Nanometer Material Technology Co., Ltd., 8-hydroxyquinoline (CAS No. 148-24-3), polyvinylidene fluoride (CAS No. 24937-79-9), epoxy resin type E-44 (CAS No. 61788-97-4), solvent is ethyl acetate (CAS No. 141-78-6), zinc phosphate (CAS No. 7543-51-3), curing agent is polyamide epoxy resin curing agent 2115, ZIF-8 (CAS: 59061-53-9), ZIF-8 (CAS No. 59061-53-9).

[0033] Example 1

[0034] Preparation of metal organic framework material

[0035] 4.29 kg of benzotriazole, 4.08 kg of 5-tert-butyl m-benzenedicarboxylic acid, 21.46 kg of zinc nitrate hexahydrate and 0.17 kg of graphene oxide are mixed and dispersed into a 100 L mixed solution of acetonitrile and water in a volume ratio of 3:1, and a MOF reaction solution is obtained after ultrasonic treatment for 30 min. The MOF reaction solution is reacted in a high-temperature reaction kettle at 120°C for 48 h, and then washed with deionized water and anhydrous ethanol for three times respectively after being cooled to below 30°C. The metal-organic framework material is obtained after drying in an 80°C oven.

[0036] Preparation of metal-organic framework material corrosion inhibitor

[0037] 25 kg of metal-organic framework material and 5 kg of 8-hydroxyquinoline are mixed and dispersed into 50 L of anhydrous ethanol, and stirred at a speed of 200 rpm for 12 h. After centrifugation, the metal-organic framework material corrosion inhibitor is obtained after drying in an 80°C oven.

[0038] Preparation of modified polyvinylidene fluoride

[0039] 20 kg of polyvinylidene fluoride and 2 kg of sodium hydroxide are dispersed into 30 L of a mixed solution of ethanol and deionized water in a volume ratio of 1:1, and stirred at a speed of 200 rpm in a 60°C water bath for 6 h to obtain a modified solution. The modified polyvinylidene fluoride is obtained after drying the modified solution in an 80°C oven.

[0040] Preparation of antioxidant coating

[0041] 8 kg of modified polyvinylidene fluoride, 40 kg of epoxy resin and 15 L of solvent are mixed and dispersed to obtain a resin dispersion liquid. 20 kg of metal-organic framework material corrosion inhibitor and 5 kg of zinc phosphate are added to the resin dispersion liquid, and stirred at a speed of 500 rpm for 1 h. After being ground to a fineness of less than 50 μm, the antioxidant coating is obtained.

[0042] Preparation of ultra-thin antioxidant stainless steel strip

[0043] An ultra-thin stainless steel strip substrate is prepared, and the elemental composition of the ultra-thin stainless steel strip substrate is as follows: nickel 2.5%, aluminum 6%, zinc 4.5%, tin 6%, boron 0.1%, bismuth 0.05%, cobalt 0.05%, manganese 1.5%, phosphorus 0.05%, lanthanum 0.1%, and the balance being iron and unavoidable impurities.

[0044] The ultra-thin stainless steel strip substrate is subjected to polishing treatment. The polished stainless steel strip is immersed in an alkali solution at 65°C for 10 min to obtain an oil-removed stainless steel strip. The above-mentioned alkali solution is obtained by mixing and dispersing 5 kg of sodium hydroxide and 1 kg of sodium bicarbonate into 100 L of deionized water. The oil-removed stainless steel strip is immersed in a 0.1 mol / L hydrochloric acid solution for 2 min to obtain an acid-washed stainless steel strip. The acid-washed stainless steel strip is washed with deionized water and dried at 40°C to obtain a pretreated stainless steel strip.

[0045] Mixing and dispersing 9 kg of zinc sulfate, 5 kg of nickel sulfamate, 2 kg of sodium tungstate, 2 kg of sodium hypophosphite, 6 kg of sodium citrate, 3 kg of boric acid and 8 g of sodium dodecyl sulfate into 100 L of deionized water, and after stirring at a speed of 200 rpm for 1 h, a plating solution is obtained. A lead plate is used as an anode, and a pretreated stainless steel strip is used as a cathode, which is immersed in the plating solution to perform electroplating operation, with the current density controlled at 3 A / dm 2 , the electroplating temperature is 50℃, the electroplating time is 90 min, and after electroplating is completed, the stainless steel strip with an electroplated corrosion-resistant layer is obtained after being washed with deionized water and dried.

[0046] Mixing and dispersing 9 kg of zinc sulfate, 5 kg of nickel sulfamate, 2 kg of sodium tungstate, 2 kg of sodium hypophosphite, 6 kg of sodium citrate, 3 kg of boric acid and 8 g of sodium dodecyl sulfate into 100 L of deionized water, and after stirring at a speed of 200 rpm for 1 h, a plating solution is obtained. A lead plate is used as an anode, and a pretreated stainless steel strip is used as a cathode, which is immersed in the plating solution to perform electroplating operation, with the current density controlled at 3 A / dm

[0047] Example 2

[0048] Preparation of metal organic framework material

[0049] Mixing and dispersing 4.28 kg of benzotriazole, 4.07 kg of 5-tert-butyl isophthalic acid, 21.4 kg of zinc nitrate hexahydrate and 0.25 kg of graphene oxide into 100 L of a mixed solution of acetonitrile and water in a volume ratio of 3:1, and after ultrasonic treatment for 30 min, a MOF reaction solution is obtained. The MOF reaction solution is reacted in a high-temperature reaction kettle at 120℃ for 48 h, and after being cooled to below 30℃, it is washed with deionized water and anhydrous ethanol three times respectively, and then dried in an 80℃ oven to obtain a metal organic framework material.

[0050] Preparation of metal organic framework material corrosion inhibitor

[0051] Mixing and dispersing 25 kg of metal organic framework material and 5 kg of 8-hydroxyquinoline into 50 L of anhydrous ethanol, and stirring at a speed of 200 rpm for 12 h, and then drying in an 80℃ oven after centrifugation to obtain a metal organic framework material corrosion inhibitor.

[0052] Preparation of modified polyvinylidene fluoride

[0053] Mixing and dispersing 20 kg of polyvinylidene fluoride and 2 kg of sodium hydroxide into 30 L of a mixed solution of ethanol and deionized water in a volume ratio of 1:1, and stirring at a speed of 200 rpm for 6 h in a 60℃ water bath to obtain a modified solution, and then drying the modified solution in an 80℃ oven to obtain modified polyvinylidene fluoride.

[0054] Preparation of antioxidant coating

[0055] 8 kg of modified polyvinylidene fluoride, 40 kg of epoxy resin and 15 L of solvent are mixed and dispersed to obtain a resin dispersion liquid, 20 kg of metal-organic framework corrosion inhibitor and 5 kg of zinc phosphate are added to the resin dispersion liquid, and after stirring at a speed of 500 rpm for 1 h, grinding is performed to a fineness of less than 50 μm to obtain an antioxidant coating.

[0056] Preparation of an ultra-thin antioxidant stainless steel strip

[0057] An ultra-thin stainless steel strip substrate is prepared, such that the elemental composition of the ultra-thin stainless steel strip substrate is: nickel 3.5%, aluminum 8%, zinc 3.5%, tin 2%, boron 0.05%, bismuth 0.02%, cobalt 0.07%, manganese 3%, phosphorus 0.02%, lanthanum 0.06%, and the balance being iron and unavoidable impurities.

[0058] The ultra-thin stainless steel strip substrate is subjected to polishing treatment, and the polished stainless steel strip is immersed in an alkali solution at 65°C for 10 min to obtain an oil-removed stainless steel strip, the above-mentioned alkali solution is obtained by mixing and dispersing 5 kg of sodium hydroxide and 1 kg of sodium bicarbonate into 100 L of deionized water; the oil-removed stainless steel strip is immersed in a 0.1 mol / L hydrochloric acid solution for 2 min to obtain an acid-washed stainless steel strip, and the acid-washed stainless steel strip is washed with deionized water and dried at 40°C to obtain a pretreated stainless steel strip.

[0059] 9 kg of zinc sulfate, 5 kg of nickel sulfamic acid, 2 kg of sodium tungstate, 2 kg of sodium hypophosphite, 6 kg of sodium citrate, 3 kg of boric acid and 8 g of sodium dodecyl sulfate are mixed and dispersed into 100 L of deionized water to obtain a plating solution after stirring at a speed of 200 rpm for 1 h. A lead plate is used as an anode, and the pretreated stainless steel strip is used as a cathode, and is immersed in the plating solution for electroplating operation, the current density is controlled to be 3 A / dm2, the electroplating temperature is 70°C, and the electroplating time is 60 min, and after the electroplating is completed, the stainless steel strip with an electroplated corrosion-resistant layer is obtained by washing with deionized water and drying.

[0060] The antioxidant coating and the curing agent are mixed in a mass ratio of 20:1 and coated on the surface of the stainless steel strip with an electroplated corrosion-resistant layer, and after the coating is air-dried, curing is performed at 100°C for 2 h to obtain an ultra-thin antioxidant stainless steel strip.

[0061] Example 3

[0062] Preparation of a metal-organic framework

[0063] 4.29 kg of benzotriazole, 4.07 kg of 5-tert-butyl m-benzenedicarboxylic acid, 21.43 kg of zinc nitrate hexahydrate and 0.21 kg of graphene oxide are mixed and dispersed into a 100 L mixed solution of acetonitrile and water in a volume ratio of 3:1, and a MOF reaction solution is obtained after ultrasonic treatment for 30 min. The MOF reaction solution is reacted in a high-temperature reaction kettle at 120°C for 48 h, and then washed with deionized water and anhydrous ethanol for three times respectively after being cooled to below 30°C. The metal-organic framework material is obtained after drying in an 80°C oven.

[0064] Preparation of metal-organic framework material corrosion inhibitor

[0065] 25 kg of metal-organic framework material and 5 kg of 8-hydroxyquinoline are mixed and dispersed into 50 L of anhydrous ethanol, and the stirring is carried out at a speed of 200 rpm for 12 h. After centrifugation, the metal-organic framework material corrosion inhibitor is obtained after drying in an 80°C oven.

[0066] Preparation of modified polyvinylidene fluoride

[0067] 20 kg of polyvinylidene fluoride and 2 kg of sodium hydroxide are dispersed into 30 L of a mixed solution of ethanol and deionized water in a volume ratio of 1:1, and the stirring is carried out at a speed of 200 rpm for 6 h in a 60°C water bath to obtain a modified solution. The modified polyvinylidene fluoride is obtained after drying the modified solution in an 80°C oven.

[0068] Preparation of antioxidant coating

[0069] 8 kg of modified polyvinylidene fluoride, 40 kg of epoxy resin and 15 L of solvent are mixed and dispersed to obtain a resin dispersion solution. 20 kg of metal-organic framework material corrosion inhibitor and 5 kg of zinc phosphate are added to the resin dispersion solution, and the stirring is carried out at a speed of 500 rpm for 1 h. Then, the grinding is carried out to a fineness of less than 50 μm to obtain the antioxidant coating.

[0070] Preparation of ultra-thin antioxidant stainless steel strip

[0071] An ultra-thin stainless steel strip substrate is prepared, and the elemental composition of the ultra-thin stainless steel strip substrate is as follows: nickel 3%, aluminum 7%, zinc 4%, tin 4%, boron 0.075%, bismuth 0.035%, cobalt 0.06%, manganese 2.25%, phosphorus 0.035%, lanthanum 0.08%, and the balance being iron and unavoidable impurities.

[0072] The ultra-thin stainless steel strip substrate is subjected to polishing treatment. The polished stainless steel strip is immersed in an alkali solution at 65°C for 10 min to obtain an oil-removed stainless steel strip. The above-mentioned alkali solution is obtained by mixing and dispersing 5 kg of sodium hydroxide and 1 kg of sodium bicarbonate into 100 L of deionized water. The oil-removed stainless steel strip is immersed in a 0.1 mol / L hydrochloric acid solution for 2 min to obtain an acid-washed stainless steel strip. The acid-washed stainless steel strip is washed with deionized water and dried at 40°C to obtain a pretreated stainless steel strip.

[0073] 9 kg of zinc sulfate, 5 kg of nickel sulfamate, 2 kg of sodium tungstate, 2 kg of sodium hypophosphite, 6 kg of sodium citrate, 3 kg of boric acid and 8 g of sodium dodecyl sulfate were mixed and dispersed into 100 L of deionized water to obtain a plating solution. After stirring at a speed of 200 rpm for 1 h, a lead plate was used as an anode, and a pretreated stainless steel strip was used as a cathode, and was immersed in the plating solution to perform electroplating operation, the current density was controlled to be 3 A / dm2, the electroplating temperature was 60℃, and the electroplating time was 75 min. After electroplating was completed, deionized water was used for cleaning, and after drying, a stainless steel strip with an electroplated corrosion-resistant layer was obtained.

[0074] The antioxidant coating and the curing agent were mixed in a mass ratio of 20:1 and coated on the surface of the stainless steel strip with the electroplated corrosion-resistant layer. After the coating was air-dried, it was cured at 100℃ for 2 h to obtain an ultra-thin antioxidant stainless steel strip.

[0075] Example 4

[0076] Example 4 is based on Example 3, and the difference between Example 4 and Example 3 is only that in Example 4, the amount of benzotriazole is 4.3 kg, the amount of 5-tert-butyl isophthalic acid is 4.09 kg, the amount of zinc nitrate hexahydrate is 21.51 kg, and the amount of graphene oxide is 0.1 kg.

[0077] Example 5

[0078] Example 5 is based on Example 3, and the difference between Example 5 and Example 3 is only that in Example 5, the amount of benzotriazole is 4.27 kg, the amount of 5-tert-butyl isophthalic acid is 4.06 kg, the amount of zinc nitrate hexahydrate is 21.35 kg, and the amount of graphene oxide is 0.32 kg.

[0079] Example 6

[0080] Example 6 is based on Example 3, and the difference between Example 6 and Example 3 is only that in Example 6, no graphene oxide is added when preparing the metal organic framework material.

[0081] Example 7

[0082] Example 7 is based on Example 3, and the difference between Example 7 and Example 3 is only that in Example 7, the metal organic framework material is replaced by ZIF-8 when preparing the metal organic framework material corrosion inhibitor.

[0083] Example 8

[0084] Example 8 is based on Example 3, and the difference between Example 8 and Example 3 is only that in Example 8, the modified polyvinylidene fluoride is replaced by polyvinylidene fluoride when preparing the antioxidant coating.

[0085] Example 9

[0086] Example 9 is based on Example 3, and the only difference between Example 9 and Example 3 is that no sodium hypophosphite is added to the plating solution in Example 9.

[0087] Example 10

[0088] Example 10 is based on Example 3, and the only difference between Example 10 and Example 3 is that no sodium tungstate is added to the plating solution in Example 10.

[0089] Example 11

[0090] Example 11 is based on Example 3, and the only difference between Example 11 and Example 3 is that the nickel sulfamate in the plating solution is replaced by nickel sulfate in Example 11.

[0091] Example 12

[0092] Example 12 is based on Example 3, and the only difference between Example 12 and Example 3 is that the plating temperature is 30°C and the plating time is 120 min when preparing the electroplated corrosion-resistant layer in Example 12.

[0093] Example 13

[0094] Example 13 is based on Example 3, and the only difference between Example 13 and Example 3 is that the plating temperature is 90°C and the plating time is 30 min when preparing the electroplated corrosion-resistant layer in Example 13.

[0095] Comparative Example 1

[0096] Comparative Example 1 is based on Example 3, and the only difference between Comparative Example 1 and Example 3 is that no electroplated corrosion-resistant layer is prepared in Comparative Example 1.

[0097] Comparative Example 2

[0098] Comparative Example 2 is based on Example 3, and the only difference between Comparative Example 2 and Example 3 is that no oxidation-resistant coating is prepared in Comparative Example 2.

[0099] Performance Test Test

[0100] (1) The standard GB / T 228-2021 Metal Material Room Temperature Tensile Test Method was selected, and the tensile test machine was used to apply tension, gradually increasing the tension, and the maximum stress value before the sample was pulled off was recorded, which was the tensile strength. Three samples were prepared for each sample, and the average value was taken after measurement. The results are recorded in Table 1.

[0101] (2) Select GB / T 19746-2018 Metal and Alloy Corrosion Salt Solution Circumferential Immersion Test as the standard, prepare the sample for the experiment, immerse the sample in the simulated humid atmosphere environment, the experimental solution contains 1 g / L acetic acid and 1 g / L formic acid aqueous solution, after 3 weeks of circumferential immersion, test the corrosion depth of the sample, calculate the corrosion rate, and observe and record the corrosion condition of the sample, the results are recorded in Table 1.

[0102] (3) Select GB / T 13303-1991 Steel Oxidation Resistance Performance Test Method as the standard, prepare 3 samples for the experiment, maintain at 800℃ for 500h, test and calculate the oxidation rate of the sample, take the average value after measurement, the results are recorded in Table 1.

[0103] Table 1 Detection results of the strength and oxidation resistance performance of the stainless steel strip

[0104]

[0105] From Table 1, the tensile strength of Examples 1-3 is greater than 746 MPa, the corrosion rate is less than 0.009 mm / a, and the oxidation rate is less than 0.003 g / m 2 ·h, so that the stainless steel strip prepared by the application has good tensile strength, corrosion resistance and oxidation resistance.

[0106] From Table 1, the difference between Examples 4 and 5 and Example 3 is only that in Example 4, the mass ratio of benzotriazole, 5-tert-butyl resorcylic acid, zinc nitrate hexahydrate and graphene oxide is 0.2:0.19:1:0.005, and in Example 5, the mass ratio of benzotriazole, 5-tert-butyl resorcylic acid, zinc nitrate hexahydrate and graphene oxide is 0.2:0.19:1:0.015, compared with Example 3, the tensile strength, corrosion resistance and oxidation resistance of Examples 4 and 5 are all decreased; This is because the mass ratio of benzotriazole, 5-tert-butyl resorcylic acid, zinc nitrate hexahydrate and graphene oxide is not within the limited range, too much or too little graphene will affect the structure and performance of the metal organic framework material, thereby affecting the active and passive corrosion resistance, and the tensile strength, corrosion resistance and oxidation resistance of the stainless steel strip are decreased.

[0107] As shown in Table 1, the difference between Examples 6, 7, 8 and Example 3 is that: in Example 6, graphene oxide is not added when preparing the metal organic framework material; in Example 7, the metal organic framework material is replaced by ZIF-8 when preparing the metal organic framework material corrosion inhibitor; in Example 8, the modified polyvinylidene fluoride is replaced by polyvinylidene fluoride when preparing the oxidation-resistant coating. Compared with Example 3, the tensile strength, corrosion resistance and oxidation resistance of Examples 6, 7, 8 are decreased. This is because if the graphene oxide is not added, the passive protection effect is lacking, and the corrosion protection effect is poor; if the metal organic framework material is replaced by ZIF-8, the ligand of ZIF-8 lacks corrosion inhibition effect; if the modified polyvinylidene fluoride is replaced by polyvinylidene fluoride, the modification effect is lacking, the reactivity and compatibility are decreased, the stability and hydrophobicity of the coating are decreased, and thus the tensile strength, corrosion resistance and oxidation resistance are decreased.

[0108] As shown in Table 1, the difference between Examples 9, 10, 11 and Example 3 is that: in Example 9, sodium hypophosphite is not added in the plating solution; in Example 10, sodium tungstate is not added in the plating solution; in Example 11, the nickel sulfamate in the plating solution is replaced by nickel sulfate. Compared with Example 3, the tensile strength, corrosion resistance and oxidation resistance of Examples 9, 10, 11 are decreased. This is because the components in the plating solution are replaced and reduced, which affects the composition, crystal phase structure and grain size of the alloy plating layer, thereby affecting the stability and oxidation resistance of the alloy plating layer, and the tensile strength, corrosion resistance and oxidation resistance of the stainless steel strip are decreased.

[0109] As shown in Table 1, the difference between Examples 12, 13 and Example 3 is that: in Example 12, the electroplating temperature for preparing the electroplated corrosion-resistant layer is 30°C, and the electroplating time is 120 min; in Example 13, the electroplating temperature for preparing the electroplated corrosion-resistant layer is 90°C, and the electroplating time is 30 min. Compared with Example 3, the tensile strength, corrosion resistance and oxidation resistance of Examples 12, 13 are decreased. This is because the temperature and time of electroplating are adjusted, which affects the crystal phase distribution and thickness of the plating layer, and thus affects the stability and durability of the plating layer, and the tensile strength, corrosion resistance and oxidation resistance are decreased.

[0110] As shown in Table 1, the difference between Comparative Examples 1, 2 and Example 3 is that: in Comparative Example 1, the electroplated corrosion-resistant layer is not prepared; in Comparative Example 2, the oxidation-resistant coating is not prepared. Compared with Example 3, the tensile strength, corrosion resistance and oxidation resistance of Comparative Examples 1, 2 are significantly decreased. This is because the electroplated corrosion-resistant layer or the oxidation-resistant coating is not prepared, which lacks the toughening effect of the plating layer or the coating, and the reduction of the protective layer allows the corrosion medium to penetrate into the stainless steel strip through the weak part, thereby the tensile strength, corrosion resistance and oxidation resistance are decreased.

[0111] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. An ultra-thin anti-oxidation stainless steel strip, characterized in that: The product comprises an ultra-thin stainless steel strip substrate, an electroplated corrosion-resistant layer, and an anti-oxidation coating. The ultra-thin stainless steel strip substrate comprises the following components in parts by weight: nickel 2.5-3.5%, aluminum 6-8%, zinc 3.5-4.5%, tin 2-6%, boron 0.05-0.1%, bismuth 0.02-0.05%, cobalt 0.05-0.07%, manganese 1.5-3%, phosphorus 0.02-0.05%, lanthanum 0.06-0.1%, with the balance being iron and unavoidable impurities. The antioxidant coating is obtained by coating an antioxidant paint onto the surface of an electroplated corrosion-resistant layer. The raw materials for preparing the antioxidant paint include metal-organic framework corrosion inhibitors, modified polyvinylidene fluoride, zinc phosphate, epoxy resin, and solvents. The raw materials for preparing the metal-organic framework material corrosion inhibitor include a metal-organic framework material and a corrosion inhibitor. The raw materials for preparing the metal-organic framework material include benzotriazole, 5-tert-butylisophthalic acid, zinc nitrate hexahydrate and graphene oxide. The corrosion inhibitor includes 8-hydroxyquinoline. The mass ratio of benzotriazole, 5-tert-butyl-isophthalic acid, zinc nitrate hexahydrate, and graphene oxide is 0.2:0.19:1:(0.008-0.012). The modified polyvinylidene fluoride was prepared using the following steps: Polyvinylidene fluoride and sodium hydroxide were dispersed in an aqueous ethanol solution and heated and stirred to obtain a modified solution. The modified solution was then dried under heating conditions to obtain modified polyvinylidene fluoride. The ultra-thin, oxidation-resistant stainless steel strip is prepared using the following steps: Prepare an ultra-thin stainless steel strip substrate; pretreat the ultra-thin stainless steel strip substrate by polishing, degreasing, pickling, washing and drying to obtain the pretreated stainless steel strip. The pretreated stainless steel strip is immersed in a plating solution for electroplating to obtain a stainless steel strip with an electroplated corrosion-resistant layer. Antioxidant coating and curing agent are mixed and applied to the surface of stainless steel strip with electroplated corrosion-resistant layer. After the coating dries, it is heated and cured to obtain ultra-thin antioxidant stainless steel strip. The electroplated corrosion-resistant layer includes zinc, nickel, phosphorus, and tungsten; The plating solution includes zinc sulfate, nickel aminosulfonate, sodium tungstate, sodium hypophosphite, sodium citrate, boric acid, and sodium dodecyl sulfate.

2. The ultra-thin anti-oxidation stainless steel strip according to claim 1, characterized in that: The electroplated corrosion-resistant layer is prepared using the following steps: Using a lead plate as the anode and a pretreated stainless steel strip as the cathode, the strip is immersed in a plating solution for electroplating. The temperature and time are controlled. After electroplating, the strip is washed with water and dried to obtain a stainless steel strip with an electroplated corrosion-resistant layer.

3. The ultra-thin anti-oxidation stainless steel strip according to claim 2, characterized in that: The electroplating temperature is 50-70℃, and the electroplating time is 60-90min.

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