CN111704845A - Coating treatment method for iron-based surface with anticorrosion function - Google Patents

Abstract

The invention relates to the field of anticorrosive coatings, in particular to a coating treatment method with an anticorrosive function on an iron-based surface, which comprises the following steps: (1) polishing the iron-based alloy; (2) carrying out sand blasting treatment on the polished iron-based alloy; (3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot; (4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot. The invention solves the problem that the existing treatment method for spraying a single coating cannot meet the requirements of high strength, corrosion resistance, wear resistance and the like.

Description

Coating treatment method for iron-based surface with anticorrosion function

Technical Field

The invention relates to the field of anticorrosive coatings, in particular to a coating treatment method with an anticorrosive function on an iron-based surface.

Background

Among metal structure materials, the iron-based alloy material is a common one, has higher density, good mechanical property and higher strength and rigidity. The iron base also has the advantages of good dimensional stability, excellent heat and electricity conductivity and the like, and cannot be easily deformed when being cast into a structural member, so that the iron base is widely applied to various aspects in the industrial field. However, the iron base has poor corrosion resistance, cannot meet the use requirement of severe environment, and limits the application of the iron base.

In the prior art, a certain coating is generally sprayed on the surface of an iron base in order to achieve a series of functions, so that the purposes of saving materials and energy can be achieved. The iron base after being sprayed with the coating can be widely applied to the industries of thermal power generation, oil drilling, oil and gas pipelines, coal-fired power generation, hydroelectric power generation, pharmaceutical chemical industry, coal and the like, can cope with various corrosion and abrasion working condition environments to a certain extent, prolongs the service life of a workpiece, reduces unplanned downtime and reduces the operation and maintenance cost of equipment.

However, at present, the spraying of the coating on the common material is generally to spray a single coating on the substrate, such as spraying a nanocrystalline alloy coating, so as to improve the strength of the material surface, or spraying an amorphous alloy coating, so as to improve the corrosion resistance of the material surface. However, the treatment method of spraying a single coating often cannot satisfy the performances of high strength, corrosion resistance, wear resistance and the like at the same time.

Disclosure of Invention

Aiming at the problems, the invention provides a coating treatment method for an iron-based surface with an anti-corrosion function, which comprises the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

Preferably, the sand blasting treatment is dry sand blasting treatment, the abrasive used in the sand blasting treatment is 20# white corundum sand, the pressure of the sand blasting treatment is 0.65MPa, the speed of the sand blasting treatment is 0.5cm/s, and the time of the sand blasting treatment is 5 min.

Preferably, the speed of the supersonic flame spraying is 15-25 m/min, and the flow of the oxygen for the supersonic flame spraying is 20-50 m³The flow rate of the fuel oil for supersonic flame spraying is 14-25L/h, and the spray distance of the supersonic flame spraying is 260-380 mm; the fuel oil is kerosene; the powder feeding amount of the supersonic flame spraying is 20-50 g/min.

Preferably, the spraying thickness of the first anticorrosive coating is 200-300 μm; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

Preferably, the first anticorrosive coating consists of the following components in parts by weight:

50-80 parts of modified epoxy resin, 10-20 parts of polycarbonate, 3-15 parts of diatom powder, 4-8 parts of glass fiber, 2-6 parts of vegetable oil, 1-5 parts of carbon nano tube, 1-6 parts of phenyl trimethoxy silane, 0.5-2 parts of wetting dispersant, 0.1-1 part of defoaming agent and 20-40 parts of curing agent.

Preferably, the modified epoxy resin is obtained by modifying an epoxy resin with a niobium carbide modifier.

Preferably, the preparation method of the niobium carbide modified substance comprises the following steps:

s1, weighing niobium carbide, adding the niobium carbide into 98% ethanol in volume fraction, stirring uniformly, performing ultrasonic treatment for 2-5 hours, filtering to obtain a solid, and drying at 70-80 ℃ to obtain a niobium carbide pretreatment substance;

wherein the solid-to-liquid ratio of niobium carbide to ethanol is 1: 10-15;

s2, weighing vinyl tris (2-methoxyethoxy) silane, adding the vinyl tris (2-methoxyethoxy) silane into ethanol with the volume fraction of 98%, stirring until the mixture is uniformly dispersed, adding the niobium carbide pretreatment substance, heating to 50-60 ℃, stirring for reaction for 2-5 hours, standing and cooling to room temperature, filtering to obtain a solid, washing with acetone for three times, then washing with deionized water for three times, and drying at 80-90 ℃ to obtain a niobium carbide activated substance;

wherein the mass ratio of the vinyl tri (2-methoxyethoxy) silane to the niobium carbide pretreatment substance to the ethanol is 0.1-1: 2-5: 15-25;

s3, weighing hydroxypropyl methyl cellulose, adding the hydroxypropyl methyl cellulose into deionized water, and stirring until the hydroxypropyl methyl cellulose is completely dissolved to obtain a hydroxypropyl methyl cellulose solution; weighing the niobium carbide activator, adding the niobium carbide activator into a ball mill, adding the hydroxypropyl methyl cellulose solution, stirring uniformly, adding a grinding ball, and performing wet ball milling for 10-20 hours to obtain a mixed wet material;

wherein the solid-to-liquid ratio of the hydroxypropyl methyl cellulose to the deionized water is 1: 10-15; the solid-to-liquid ratio of the niobium carbide activator to the hydroxypropyl methyl cellulose solution is 1: 2-3;

s3, carrying out vulcanization drying treatment on the mixed wet material, then carrying out vacuum drying, and crushing into nano particles to obtain a niobium carbide modified substance;

wherein the temperature of fluidized drying is 80-100 ℃; the temperature of vacuum drying is 50-80 ℃.

Preferably, the second anticorrosive coating consists of the following components in parts by weight:

50-60 parts of epoxy resin, 10-30 parts of modified polyurethane, 2-10 parts of carbon micro powder modifier, 5-18 parts of mica powder, 2-5 parts of titanium dioxide, 0.5-2 parts of wetting dispersant, 0.1-0.5 part of defoaming agent and 20-30 parts of curing agent.

The preparation method of the carbon micro powder modified substance comprises the following steps:

s1, weighing carbon micro powder, adding the carbon micro powder into a graphite furnace, taking inert gas as protective gas, heating to 800-1000 ℃ for the first time, and preserving heat for 2-3 hours; heating to 1500-1600 ℃ for the second time, and preserving heat for 2-3 hours; heating to 1800-2000 ℃ for the third time, preserving heat for 2-3 hours, cooling to room temperature, and crushing into nano particles to obtain carbon micropowder nano activated matter;

wherein the first temperature rise rate is 5-8 ℃/min; the rate of the second temperature rise is 7-10 ℃/min; the rate of the third temperature rise is 8-10 ℃/min;

s2, weighing bismuth trichloride, adding the bismuth trichloride into deionized water, dropwise adding hydrochloric acid with the concentration of 0.1mol/L until the pH value of the liquid is 5.0-6.0, and stirring until the bismuth trichloride is dissolved to obtain a bismuth trichloride solution; weighing stannous hydroxide, adding the stannous hydroxide into a sodium hydroxide solution with the concentration of 1mol/L, and stirring until the stannous hydroxide is dissolved to obtain a sodium stannous solution;

wherein the mass ratio of bismuth trichloride to deionized water is 1: 5-10; the solid-liquid ratio of the stannous hydroxide to the sodium hydroxide solution is 1: 8-12;

s3, adding the carbon micro powder nano activator into the bismuth trichloride solution, stirring and dispersing the mixture until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, sealing the reaction kettle, reacting the mixture for 2 to 5 hours at the temperature of 70 to 80 ℃, dropwise adding the sodium stannous solution, continuously reacting for 0.5 to 1 hour, cooling the reaction kettle to room temperature, filtering the reaction kettle to obtain a solid, washing the solid to be neutral by using deionized water, drying the solid in vacuum, and crushing the solid into nano particles to obtain a carbon micro powder modified substance;

wherein the solid-to-liquid ratio of the carbon micro powder nano activator to the bismuth trichloride solution is 1: 5-10; the volume ratio of the sodium stannous solution to the bismuth trichloride solution is 1: 40-50.

Preferably, the carbon micro powder is graphite or carbon material particles with the particle size of 1-100 mu m.

Preferably, the preparation method of the modified polyurethane comprises the following steps:

(1) weighing monohydroxy polydimethylsiloxane and diisocyanate, uniformly mixing, adding dibutyltin diacetate, heating to 50-100 ℃, stirring for reacting for 1-3 h, adding trimethylolpropane, and continuing to react for 2-4 h to obtain an organic silicon long-chain extender;

wherein the mass ratio of monohydroxy polydimethylsiloxane to diisocyanate to dibutyltin diacetate to trimethylolpropane is 10: 0.8-5: 0.1-0.2: 1-5;

(2) uniformly mixing polyester polyol and an isocyanate monomer, reacting at 60-80 ℃ for 3-8 h, then adding the organic silicon long-chain extender, stirring uniformly, heating to 80-120 ℃, and continuing to react for 5-8 h to obtain modified polyurethane;

wherein the mass ratio of the polyester polyol to the isocyanate monomer to the organosilicon long-chain extender is 2-5: 0.5-2: 1.

The invention has the beneficial effects that:

1. in the invention, the iron-based metal surface can be leveled by adopting the treatment of polishing and then sand blasting, and a foundation is laid for subsequent spraying. Then, heating the iron base subjected to sand blasting to 60-100 ℃, and then carrying out supersonic flame spraying on the surface of the iron base alloy while the iron base is hot to obtain an iron base first anticorrosive coating on the surface of the iron base; and after the first anticorrosive coating is completely dried, heating to 60-100 ℃ again, and then carrying out supersonic flame spraying on the surface of the first anticorrosive coating while the first anticorrosive coating is hot. The reasons for hot spraying are: the temperature of the iron-based alloy is maintained within the temperature range, the deformation of the iron-based alloy matrix can be guaranteed, meanwhile, the coating can be cooled along with the cooling process of the matrix, the coating and the matrix can be combined more tightly, the obtained coating has higher hardness and excellent corrosion resistance, and the property of the coating is further improved by the second anticorrosive coating.

2. Niobium carbide belongs to a sodium chloride type cubic system, has excellent hardness, electrical insulation and wear resistance, is commonly used as a carbide hard alloy additive, and is hardly used in a resin because of poor dispersibility and wettability after being combined with a resin matrix. According to the invention, the structural surface of niobium carbide is modified, silane is modified and activated in a surface experiment of the niobium carbide, hydroxypropyl methyl cellulose and the activated niobium carbide are grafted by a wet ball milling method, and finally, the niobium carbide is further fixed by means of vulcanization drying and vacuum drying, so that the bondability of the niobium carbide and resin is increased, and the niobium carbide can be uniformly dispersed in the resin. In addition, the defect of high brittleness of the epoxy resin can be greatly improved after the modified niobium carbide is further combined with the epoxy resin.

3. The finish paint needs to have excellent corrosion resistance and wear resistance, and the blend resin formed by polyurethane and epoxy resin has the advantages of strong adhesion, high corrosion resistance, wear resistance and water resistance, and short drying time, but in the using process, the blend of the polyurethane and epoxy resin has the phenomena of poor weather resistance, ultraviolet ray resistance and frequent chalking after long-term sunlight, so the polyurethane and epoxy resin is modified by the carbon micro powder modifier. The carbon micro powder is taken from micro carbon material particles, has larger specific surface area and poorer dispersibility, and bismuth is a metal material with more stable property and has good mechanical property and surface property.

4. According to the invention, the organic silicon long-chain extender is prepared from monohydroxy polysiloxane and trimethylolpropane under the catalytic action of dibutyltin diacetate, the organic silicon long-chain extender is introduced into a side chain of polyurethane, and the modified polyurethane can be crosslinked with epoxy resin through a long side chain, so that the prepared anticorrosive paint has excellent ageing resistance and long-term water resistance, antifouling performance and the like.

Detailed Description

The invention is further described with reference to the following examples.

Example 1

A coating treatment method for an iron-based surface with an anti-corrosion function comprises the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

The sand blasting is dry sand blasting, the abrasive used in the sand blasting is 20# white corundum sand, the pressure of the sand blasting is 0.65MPa, the speed of the sand blasting is 0.5cm/s, and the time of the sand blasting is 5 min.

The supersonic flame spraying speed is 15-25 m/min, and the flow of oxygen for supersonic flame spraying is 20-50 m³The flow rate of the fuel oil for supersonic flame spraying is 14-25L/h, and the spray distance of the supersonic flame spraying is 260-380 mm; the fuel oil is kerosene; the powder feeding amount of the supersonic flame spraying is 20-50 g/min.

The spraying thickness of the first anticorrosive coating is 200-300 mu m; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

The first anticorrosive coating comprises the following components in parts by weight:

75 parts of modified epoxy resin, 15 parts of polycarbonate, 10 parts of diatom powder, 6 parts of glass fiber, 4 parts of vegetable oil, 3 parts of carbon nano tube, 3 parts of phenyltrimethoxysilane, 1 part of wetting dispersant, 0.5 part of defoaming agent and 30 parts of curing agent.

The modified epoxy resin is obtained by modifying epoxy resin through a niobium carbide modifier.

The preparation method of the niobium carbide modified substance comprises the following steps:

s1, weighing niobium carbide, adding the niobium carbide into 98% ethanol in volume fraction, stirring uniformly, performing ultrasonic treatment for 2-5 hours, filtering to obtain a solid, and drying at 70-80 ℃ to obtain a niobium carbide pretreatment substance;

wherein the solid-to-liquid ratio of niobium carbide to ethanol is 1: 10-15;

s2, weighing vinyl tris (2-methoxyethoxy) silane, adding the vinyl tris (2-methoxyethoxy) silane into ethanol with the volume fraction of 98%, stirring until the mixture is uniformly dispersed, adding the niobium carbide pretreatment substance, heating to 50-60 ℃, stirring for reaction for 2-5 hours, standing and cooling to room temperature, filtering to obtain a solid, washing with acetone for three times, then washing with deionized water for three times, and drying at 80-90 ℃ to obtain a niobium carbide activated substance;

wherein the mass ratio of the vinyl tri (2-methoxyethoxy) silane to the niobium carbide pretreatment substance to the ethanol is 0.1-1: 2-5: 15-25;

s3, weighing hydroxypropyl methyl cellulose, adding the hydroxypropyl methyl cellulose into deionized water, and stirring until the hydroxypropyl methyl cellulose is completely dissolved to obtain a hydroxypropyl methyl cellulose solution; weighing the niobium carbide activator, adding the niobium carbide activator into a ball mill, adding the hydroxypropyl methyl cellulose solution, stirring uniformly, adding a grinding ball, and performing wet ball milling for 10-20 hours to obtain a mixed wet material;

wherein the solid-to-liquid ratio of the hydroxypropyl methyl cellulose to the deionized water is 1: 10-15; the solid-to-liquid ratio of the niobium carbide activator to the hydroxypropyl methyl cellulose solution is 1: 2-3;

s3, carrying out vulcanization drying treatment on the mixed wet material, then carrying out vacuum drying, and crushing into nano particles to obtain a niobium carbide modified substance;

wherein the temperature of fluidized drying is 80-100 ℃; the temperature of vacuum drying is 50-80 ℃.

The second anticorrosive coating comprises the following components in parts by weight:

55 parts of epoxy resin, 20 parts of modified polyurethane, 6 parts of carbon micro powder modified substance, 12 parts of mica powder, 4 parts of titanium dioxide, 1 part of wetting dispersant, 0.3 part of defoaming agent and 25 parts of curing agent.

The preparation method of the carbon micro powder modified substance comprises the following steps:

s1, weighing carbon micro powder, adding the carbon micro powder into a graphite furnace, taking inert gas as protective gas, heating to 800-1000 ℃ for the first time, and preserving heat for 2-3 hours; heating to 1500-1600 ℃ for the second time, and preserving heat for 2-3 hours; heating to 1800-2000 ℃ for the third time, preserving heat for 2-3 hours, cooling to room temperature, and crushing into nano particles to obtain carbon micropowder nano activated matter;

wherein the first temperature rise rate is 5-8 ℃/min; the rate of the second temperature rise is 7-10 ℃/min; the rate of the third temperature rise is 8-10 ℃/min;

s2, weighing bismuth trichloride, adding the bismuth trichloride into deionized water, dropwise adding hydrochloric acid with the concentration of 0.1mol/L until the pH value of the liquid is 5.0-6.0, and stirring until the bismuth trichloride is dissolved to obtain a bismuth trichloride solution; weighing stannous hydroxide, adding the stannous hydroxide into a sodium hydroxide solution with the concentration of 1mol/L, and stirring until the stannous hydroxide is dissolved to obtain a sodium stannous solution;

wherein the mass ratio of bismuth trichloride to deionized water is 1: 5-10; the solid-liquid ratio of the stannous hydroxide to the sodium hydroxide solution is 1: 8-12;

s3, adding the carbon micro powder nano activator into the bismuth trichloride solution, stirring and dispersing the mixture until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, sealing the reaction kettle, reacting the mixture for 2 to 5 hours at the temperature of 70 to 80 ℃, dropwise adding the sodium stannous solution, continuously reacting for 0.5 to 1 hour, cooling the reaction kettle to room temperature, filtering the reaction kettle to obtain a solid, washing the solid to be neutral by using deionized water, drying the solid in vacuum, and crushing the solid into nano particles to obtain a carbon micro powder modified substance;

wherein the solid-to-liquid ratio of the carbon micro powder nano activator to the bismuth trichloride solution is 1: 5-10; the volume ratio of the sodium stannous solution to the bismuth trichloride solution is 1: 40-50.

The carbon micro powder is graphite or carbon material particles with the particle size of 1-100 mu m.

The preparation method of the modified polyurethane comprises the following steps:

(1) weighing monohydroxy polydimethylsiloxane and diisocyanate, uniformly mixing, adding dibutyltin diacetate, heating to 50-100 ℃, stirring for reacting for 1-3 h, adding trimethylolpropane, and continuing to react for 2-4 h to obtain an organic silicon long-chain extender;

wherein the mass ratio of monohydroxy polydimethylsiloxane to diisocyanate to dibutyltin diacetate to trimethylolpropane is 10: 0.8-5: 0.1-0.2: 1-5;

(2) uniformly mixing polyester polyol and an isocyanate monomer, reacting at 60-80 ℃ for 3-8 h, then adding the organic silicon long-chain extender, stirring uniformly, heating to 80-120 ℃, and continuing to react for 5-8 h to obtain modified polyurethane;

wherein the mass ratio of the polyester polyol to the isocyanate monomer to the organosilicon long-chain extender is 2-5: 0.5-2: 1.

Example 2

A coating treatment method for an iron-based surface with an anti-corrosion function comprises the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

The sand blasting is dry sand blasting, the abrasive used in the sand blasting is 20# white corundum sand, the pressure of the sand blasting is 0.65MPa, the speed of the sand blasting is 0.5cm/s, and the time of the sand blasting is 5 min.

The supersonic flame spraying speed is 15-25 m/min, and the flow of oxygen for supersonic flame spraying is 20-50 m³H, the fuel for supersonic flame sprayingThe flow rate of the oil is 14-25L/h, and the spray distance of the supersonic flame spraying is 260-380 mm; the fuel oil is kerosene; the powder feeding amount of the supersonic flame spraying is 20-50 g/min.

The spraying thickness of the first anticorrosive coating is 200-300 mu m; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

The first anticorrosive coating comprises the following components in parts by weight:

50 parts of modified epoxy resin, 10 parts of polycarbonate, 3 parts of diatom powder, 4 parts of glass fiber, 1 part of carbon nano tube, 1 part of phenyltrimethoxysilane, 0.5 part of wetting dispersant, 0.1 part of defoamer and 20 parts of curing agent.

The modified epoxy resin is obtained by modifying epoxy resin through a niobium carbide modifier.

The preparation method of the niobium carbide modified substance comprises the following steps:

s1, weighing niobium carbide, adding the niobium carbide into 98% ethanol in volume fraction, stirring uniformly, performing ultrasonic treatment for 2-5 hours, filtering to obtain a solid, and drying at 70-80 ℃ to obtain a niobium carbide pretreatment substance;

wherein the solid-to-liquid ratio of niobium carbide to ethanol is 1: 10-15;

s2, weighing vinyl tris (2-methoxyethoxy) silane, adding the vinyl tris (2-methoxyethoxy) silane into ethanol with the volume fraction of 98%, stirring until the mixture is uniformly dispersed, adding the niobium carbide pretreatment substance, heating to 50-60 ℃, stirring for reaction for 2-5 hours, standing and cooling to room temperature, filtering to obtain a solid, washing with acetone for three times, then washing with deionized water for three times, and drying at 80-90 ℃ to obtain a niobium carbide activated substance;

wherein the mass ratio of the vinyl tri (2-methoxyethoxy) silane to the niobium carbide pretreatment substance to the ethanol is 0.1-1: 2-5: 15-25;

s3, weighing hydroxypropyl methyl cellulose, adding the hydroxypropyl methyl cellulose into deionized water, and stirring until the hydroxypropyl methyl cellulose is completely dissolved to obtain a hydroxypropyl methyl cellulose solution; weighing the niobium carbide activator, adding the niobium carbide activator into a ball mill, adding the hydroxypropyl methyl cellulose solution, stirring uniformly, adding a grinding ball, and performing wet ball milling for 10-20 hours to obtain a mixed wet material;

wherein the solid-to-liquid ratio of the hydroxypropyl methyl cellulose to the deionized water is 1: 10-15; the solid-to-liquid ratio of the niobium carbide activator to the hydroxypropyl methyl cellulose solution is 1: 2-3;

s3, carrying out vulcanization drying treatment on the mixed wet material, then carrying out vacuum drying, and crushing into nano particles to obtain a niobium carbide modified substance;

wherein the temperature of fluidized drying is 80-100 ℃; the temperature of vacuum drying is 50-80 ℃.

The second anticorrosive coating comprises the following components in parts by weight:

50 parts of epoxy resin, 10 parts of modified polyurethane, 2 parts of carbon micro powder modified substance, 5 parts of mica powder, 2 parts of titanium dioxide, 0.5 part of wetting dispersant, 0.1 part of defoaming agent and 20 parts of curing agent.

The preparation method of the carbon micro powder modified substance comprises the following steps:

s1, weighing carbon micro powder, adding the carbon micro powder into a graphite furnace, taking inert gas as protective gas, heating to 800-1000 ℃ for the first time, and preserving heat for 2-3 hours; heating to 1500-1600 ℃ for the second time, and preserving heat for 2-3 hours; heating to 1800-2000 ℃ for the third time, preserving heat for 2-3 hours, cooling to room temperature, and crushing into nano particles to obtain carbon micropowder nano activated matter;

wherein the first temperature rise rate is 5-8 ℃/min; the rate of the second temperature rise is 7-10 ℃/min; the rate of the third temperature rise is 8-10 ℃/min;

s2, weighing bismuth trichloride, adding the bismuth trichloride into deionized water, dropwise adding hydrochloric acid with the concentration of 0.1mol/L until the pH value of the liquid is 5.0-6.0, and stirring until the bismuth trichloride is dissolved to obtain a bismuth trichloride solution; weighing stannous hydroxide, adding the stannous hydroxide into a sodium hydroxide solution with the concentration of 1mol/L, and stirring until the stannous hydroxide is dissolved to obtain a sodium stannous solution;

wherein the mass ratio of bismuth trichloride to deionized water is 1: 5-10; the solid-liquid ratio of the stannous hydroxide to the sodium hydroxide solution is 1: 8-12;

s3, adding the carbon micro powder nano activator into the bismuth trichloride solution, stirring and dispersing the mixture until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, sealing the reaction kettle, reacting the mixture for 2 to 5 hours at the temperature of 70 to 80 ℃, dropwise adding the sodium stannous solution, continuously reacting for 0.5 to 1 hour, cooling the reaction kettle to room temperature, filtering the reaction kettle to obtain a solid, washing the solid to be neutral by using deionized water, drying the solid in vacuum, and crushing the solid into nano particles to obtain a carbon micro powder modified substance;

wherein the solid-to-liquid ratio of the carbon micro powder nano activator to the bismuth trichloride solution is 1: 5-10; the volume ratio of the sodium stannous solution to the bismuth trichloride solution is 1: 40-50.

The carbon micro powder is graphite or carbon material particles with the particle size of 1-100 mu m.

The preparation method of the modified polyurethane comprises the following steps:

(1) weighing monohydroxy polydimethylsiloxane and diisocyanate, uniformly mixing, adding dibutyltin diacetate, heating to 50-100 ℃, stirring for reacting for 1-3 h, adding trimethylolpropane, and continuing to react for 2-4 h to obtain an organic silicon long-chain extender;

wherein the mass ratio of monohydroxy polydimethylsiloxane to diisocyanate to dibutyltin diacetate to trimethylolpropane is 10: 0.8-5: 0.1-0.2: 1-5;

(2) uniformly mixing polyester polyol and an isocyanate monomer, reacting at 60-80 ℃ for 3-8 h, then adding the organic silicon long-chain extender, stirring uniformly, heating to 80-120 ℃, and continuing to react for 5-8 h to obtain modified polyurethane;

wherein the mass ratio of the polyester polyol to the isocyanate monomer to the organosilicon long-chain extender is 2-5: 0.5-2: 1.

Example 3

A coating treatment method for an iron-based surface with an anti-corrosion function comprises the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

The sand blasting is dry sand blasting, the abrasive used in the sand blasting is 20# white corundum sand, the pressure of the sand blasting is 0.65MPa, the speed of the sand blasting is 0.5cm/s, and the time of the sand blasting is 5 min.

The supersonic flame spraying speed is 15-25 m/min, and the flow of oxygen for supersonic flame spraying is 20-50 m³The flow rate of the fuel oil for supersonic flame spraying is 14-25L/h, and the spray distance of the supersonic flame spraying is 260-380 mm; the fuel oil is kerosene; the powder feeding amount of the supersonic flame spraying is 20-50 g/min.

The spraying thickness of the first anticorrosive coating is 200-300 mu m; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

The first anticorrosive coating comprises the following components in parts by weight:

80 parts of modified epoxy resin, 20 parts of polycarbonate, 15 parts of diatom powder, 8 parts of glass fiber, 6 parts of vegetable oil, 5 parts of carbon nano tube, 6 parts of phenyl trimethoxy silane, 2 parts of wetting dispersant, 1 part of defoaming agent and 40 parts of curing agent.

The modified epoxy resin is obtained by modifying epoxy resin through a niobium carbide modifier.

The preparation method of the niobium carbide modified substance comprises the following steps:

s1, weighing niobium carbide, adding the niobium carbide into 98% ethanol in volume fraction, stirring uniformly, performing ultrasonic treatment for 2-5 hours, filtering to obtain a solid, and drying at 70-80 ℃ to obtain a niobium carbide pretreatment substance;

wherein the solid-to-liquid ratio of niobium carbide to ethanol is 1: 10-15;

s2, weighing vinyl tris (2-methoxyethoxy) silane, adding the vinyl tris (2-methoxyethoxy) silane into ethanol with the volume fraction of 98%, stirring until the mixture is uniformly dispersed, adding the niobium carbide pretreatment substance, heating to 50-60 ℃, stirring for reaction for 2-5 hours, standing and cooling to room temperature, filtering to obtain a solid, washing with acetone for three times, then washing with deionized water for three times, and drying at 80-90 ℃ to obtain a niobium carbide activated substance;

wherein the mass ratio of the vinyl tri (2-methoxyethoxy) silane to the niobium carbide pretreatment substance to the ethanol is 0.1-1: 2-5: 15-25;

s3, weighing hydroxypropyl methyl cellulose, adding the hydroxypropyl methyl cellulose into deionized water, and stirring until the hydroxypropyl methyl cellulose is completely dissolved to obtain a hydroxypropyl methyl cellulose solution; weighing the niobium carbide activator, adding the niobium carbide activator into a ball mill, adding the hydroxypropyl methyl cellulose solution, stirring uniformly, adding a grinding ball, and performing wet ball milling for 10-20 hours to obtain a mixed wet material;

wherein the solid-to-liquid ratio of the hydroxypropyl methyl cellulose to the deionized water is 1: 10-15; the solid-to-liquid ratio of the niobium carbide activator to the hydroxypropyl methyl cellulose solution is 1: 2-3;

s3, carrying out vulcanization drying treatment on the mixed wet material, then carrying out vacuum drying, and crushing into nano particles to obtain a niobium carbide modified substance;

wherein the temperature of fluidized drying is 80-100 ℃; the temperature of vacuum drying is 50-80 ℃.

The second anticorrosive coating comprises the following components in parts by weight:

60 parts of epoxy resin, 30 parts of modified polyurethane, 10 parts of carbon micro powder modified substance, 18 parts of mica powder, 5 parts of titanium dioxide, 2 parts of wetting dispersant, 0.5 part of defoaming agent and 30 parts of curing agent.

The preparation method of the carbon micro powder modified substance comprises the following steps:

s1, weighing carbon micro powder, adding the carbon micro powder into a graphite furnace, taking inert gas as protective gas, heating to 800-1000 ℃ for the first time, and preserving heat for 2-3 hours; heating to 1500-1600 ℃ for the second time, and preserving heat for 2-3 hours; heating to 1800-2000 ℃ for the third time, preserving heat for 2-3 hours, cooling to room temperature, and crushing into nano particles to obtain carbon micropowder nano activated matter;

wherein the first temperature rise rate is 5-8 ℃/min; the rate of the second temperature rise is 7-10 ℃/min; the rate of the third temperature rise is 8-10 ℃/min;

s2, weighing bismuth trichloride, adding the bismuth trichloride into deionized water, dropwise adding hydrochloric acid with the concentration of 0.1mol/L until the pH value of the liquid is 5.0-6.0, and stirring until the bismuth trichloride is dissolved to obtain a bismuth trichloride solution; weighing stannous hydroxide, adding the stannous hydroxide into a sodium hydroxide solution with the concentration of 1mol/L, and stirring until the stannous hydroxide is dissolved to obtain a sodium stannous solution;

wherein the mass ratio of bismuth trichloride to deionized water is 1: 5-10; the solid-liquid ratio of the stannous hydroxide to the sodium hydroxide solution is 1: 8-12;

s3, adding the carbon micro powder nano activator into the bismuth trichloride solution, stirring and dispersing the mixture until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, sealing the reaction kettle, reacting the mixture for 2 to 5 hours at the temperature of 70 to 80 ℃, dropwise adding the sodium stannous solution, continuously reacting for 0.5 to 1 hour, cooling the reaction kettle to room temperature, filtering the reaction kettle to obtain a solid, washing the solid to be neutral by using deionized water, drying the solid in vacuum, and crushing the solid into nano particles to obtain a carbon micro powder modified substance;

wherein the solid-to-liquid ratio of the carbon micro powder nano activator to the bismuth trichloride solution is 1: 5-10; the volume ratio of the sodium stannous solution to the bismuth trichloride solution is 1: 40-50.

The carbon micro powder is graphite or carbon material particles with the particle size of 1-100 mu m.

The preparation method of the modified polyurethane comprises the following steps:

(1) weighing monohydroxy polydimethylsiloxane and diisocyanate, uniformly mixing, adding dibutyltin diacetate, heating to 50-100 ℃, stirring for reacting for 1-3 h, adding trimethylolpropane, and continuing to react for 2-4 h to obtain an organic silicon long-chain extender;

wherein the mass ratio of monohydroxy polydimethylsiloxane to diisocyanate to dibutyltin diacetate to trimethylolpropane is 10: 0.8-5: 0.1-0.2: 1-5;

(2) uniformly mixing polyester polyol and an isocyanate monomer, reacting at 60-80 ℃ for 3-8 h, then adding the organic silicon long-chain extender, stirring uniformly, heating to 80-120 ℃, and continuing to react for 5-8 h to obtain modified polyurethane;

wherein the mass ratio of the polyester polyol to the isocyanate monomer to the organosilicon long-chain extender is 2-5: 0.5-2: 1.

Comparative example

A coating treatment method for an iron-based surface with an anti-corrosion function comprises the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

The sand blasting is dry sand blasting, the abrasive used in the sand blasting is 20# white corundum sand, the pressure of the sand blasting is 0.65MPa, the speed of the sand blasting is 0.5cm/s, and the time of the sand blasting is 5 min.

The supersonic flame spraying speed is 15-25 m/min, and the flow of oxygen for supersonic flame spraying is 20-50 m³The flow rate of the fuel oil for supersonic flame spraying is 14-25L/h, and the spray distance of the supersonic flame spraying is 260-380 mm; the fuel oil is kerosene; the powder feeding amount of the supersonic flame spraying is 20-50 g/min.

The spraying thickness of the first anticorrosive coating is 200-300 mu m; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

The first anticorrosive coating comprises the following components in parts by weight:

75 parts of epoxy resin, 15 parts of polycarbonate, 10 parts of diatom powder, 6 parts of glass fiber, 4 parts of vegetable oil, 3 parts of carbon nano tube, 3 parts of phenyltrimethoxysilane, 1 part of wetting dispersant, 0.5 part of defoaming agent and 30 parts of curing agent.

The second anticorrosive coating comprises the following components in parts by weight:

55 parts of epoxy resin, 20 parts of polyurethane, 6 parts of graphite, 12 parts of mica powder, 4 parts of titanium dioxide, 1 part of wetting dispersant, 0.3 part of defoaming agent and 25 parts of curing agent.

For a more clear description of the present invention, the iron base treated in examples 1 to 3 of the present invention and comparative example was examined and the results are shown in Table 1.

Wherein, the aging resistance is detected according to the standard GB/T1766-2008: grade 0-5 (the smaller the value, the more resistant to aging);

water resistance was determined according to the standard GB/T1733-1993.

TABLE 1 iron-based Performance test by different methods

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. A coating treatment method for an iron-based surface with an anti-corrosion function is characterized by comprising the following steps:

(1) polishing the iron-based alloy;

(2) carrying out sand blasting treatment on the polished iron-based alloy;

(3) cleaning the surface of the iron-based alloy subjected to sand blasting, placing the iron-based alloy into a drying oven at the temperature of 60-100 ℃ for treatment for 0.2-0.5 h, and spraying a first anticorrosive coating on the surface of the iron-based alloy by using supersonic flame while the iron-based alloy is hot;

(4) and after the first anticorrosive coating is completely dried, the iron-based alloy coated with the first anticorrosive coating is placed in an oven at the temperature of 60-100 ℃ for retreating for 0.2-0.5 h, and then the supersonic flame is used for spraying a second anticorrosive coating on the surface of the first anticorrosive coating while the iron-based alloy is hot.

2. The method for treating the coating with the anticorrosive function on the iron-based surface according to claim 1, wherein the spraying thickness of the first anticorrosive coating is 200-300 μm; the spraying thickness of the second anticorrosive coating is 100-200 mu m.

3. The method for coating an iron-based surface with an anticorrosion function according to claim 1, wherein the first anticorrosion coating comprises the following components in parts by weight:

50-80 parts of modified epoxy resin, 10-20 parts of polycarbonate, 3-15 parts of diatom powder, 4-8 parts of glass fiber, 2-6 parts of vegetable oil, 1-5 parts of carbon nano tube, 1-6 parts of phenyl trimethoxy silane, 0.5-2 parts of wetting dispersant, 0.1-1 part of defoaming agent and 20-40 parts of curing agent.

4. The method for coating an iron-based surface with an anticorrosion function as recited in claim 3, wherein the modified epoxy resin is obtained by modifying an epoxy resin with a modified niobium carbide.

5. The method for treating the coating with the anticorrosive function on the iron-based surface according to claim 4, wherein the preparation method of the niobium carbide modifier comprises the following steps:

s1, weighing niobium carbide, adding the niobium carbide into 98% ethanol in volume fraction, stirring uniformly, performing ultrasonic treatment for 2-5 hours, filtering to obtain a solid, and drying at 70-80 ℃ to obtain a niobium carbide pretreatment substance;

wherein the solid-to-liquid ratio of niobium carbide to ethanol is 1: 10-15;

s2, weighing vinyl tris (2-methoxyethoxy) silane, adding the vinyl tris (2-methoxyethoxy) silane into ethanol with the volume fraction of 98%, stirring until the mixture is uniformly dispersed, adding the niobium carbide pretreatment substance, heating to 50-60 ℃, stirring for reaction for 2-5 hours, standing and cooling to room temperature, filtering to obtain a solid, washing with acetone for three times, then washing with deionized water for three times, and drying at 80-90 ℃ to obtain a niobium carbide activated substance;

wherein the mass ratio of the vinyl tri (2-methoxyethoxy) silane to the niobium carbide pretreatment substance to the ethanol is 0.1-1: 2-5: 15-25;

s3, weighing hydroxypropyl methyl cellulose, adding the hydroxypropyl methyl cellulose into deionized water, and stirring until the hydroxypropyl methyl cellulose is completely dissolved to obtain a hydroxypropyl methyl cellulose solution; weighing the niobium carbide activator, adding the niobium carbide activator into a ball mill, adding the hydroxypropyl methyl cellulose solution, stirring uniformly, adding a grinding ball, and performing wet ball milling for 10-20 hours to obtain a mixed wet material;

wherein the solid-to-liquid ratio of the hydroxypropyl methyl cellulose to the deionized water is 1: 10-15; the solid-to-liquid ratio of the niobium carbide activator to the hydroxypropyl methyl cellulose solution is 1: 2-3;

s3, carrying out vulcanization drying treatment on the mixed wet material, then carrying out vacuum drying, and crushing into nano particles to obtain a niobium carbide modified substance;

wherein the temperature of fluidized drying is 80-100 ℃; the temperature of vacuum drying is 50-80 ℃.

6. The method for coating an iron-based surface with an anticorrosion function according to claim 1, wherein the second anticorrosion coating comprises the following components in parts by weight:

50-60 parts of epoxy resin, 10-30 parts of modified polyurethane, 2-10 parts of carbon micro powder modifier, 5-18 parts of mica powder, 2-5 parts of titanium dioxide, 0.5-2 parts of wetting dispersant, 0.1-0.5 part of defoaming agent and 20-30 parts of curing agent.

7. The method for treating the coating with the anticorrosive function on the iron-based surface according to claim 6, wherein the method for preparing the carbon micro powder modified substance comprises the following steps:

s1, weighing carbon micro powder, adding the carbon micro powder into a graphite furnace, taking inert gas as protective gas, heating to 800-1000 ℃ for the first time, and preserving heat for 2-3 hours; heating to 1500-1600 ℃ for the second time, and preserving heat for 2-3 hours; heating to 1800-2000 ℃ for the third time, preserving heat for 2-3 hours, cooling to room temperature, and crushing into nano particles to obtain carbon micropowder nano activated matter;

wherein the first temperature rise rate is 5-8 ℃/min; the rate of the second temperature rise is 7-10 ℃/min; the rate of the third temperature rise is 8-10 ℃/min;

s2, weighing bismuth trichloride, adding the bismuth trichloride into deionized water, dropwise adding hydrochloric acid with the concentration of 0.1mol/L until the pH value of the liquid is 5.0-6.0, and stirring until the bismuth trichloride is dissolved to obtain a bismuth trichloride solution; weighing stannous hydroxide, adding the stannous hydroxide into a sodium hydroxide solution with the concentration of 1mol/L, and stirring until the stannous hydroxide is dissolved to obtain a sodium stannous solution;

wherein the mass ratio of bismuth trichloride to deionized water is 1: 5-10; the solid-liquid ratio of the stannous hydroxide to the sodium hydroxide solution is 1: 8-12;

s3, adding the carbon micro powder nano activator into the bismuth trichloride solution, stirring and dispersing the mixture until the mixture is uniform, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining, sealing the reaction kettle, reacting the mixture for 2 to 5 hours at the temperature of 70 to 80 ℃, dropwise adding the sodium stannous solution, continuously reacting for 0.5 to 1 hour, cooling the reaction kettle to room temperature, filtering the reaction kettle to obtain a solid, washing the solid to be neutral by using deionized water, drying the solid in vacuum, and crushing the solid into nano particles to obtain a carbon micro powder modified substance;

wherein the solid-to-liquid ratio of the carbon micro powder nano activator to the bismuth trichloride solution is 1: 5-10; the volume ratio of the sodium stannous solution to the bismuth trichloride solution is 1: 40-50.

8. The method for treating the coating with the anticorrosive function on the iron-based surface according to claim 7, wherein the carbon micro powder is graphite or carbon material particles with the particle size of 1-100 μm.

9. The method for treating the coating with the anticorrosive function on the iron-based surface according to claim 6, wherein the preparation method of the modified polyurethane comprises the following steps:

(1) weighing monohydroxy polydimethylsiloxane and diisocyanate, uniformly mixing, adding dibutyltin diacetate, heating to 50-100 ℃, stirring for reacting for 1-3 h, adding trimethylolpropane, and continuing to react for 2-4 h to obtain an organic silicon long-chain extender;

wherein the mass ratio of monohydroxy polydimethylsiloxane to diisocyanate to dibutyltin diacetate to trimethylolpropane is 10: 0.8-5: 0.1-0.2: 1-5;

(2) uniformly mixing polyester polyol and an isocyanate monomer, reacting at 60-80 ℃ for 3-8 h, then adding the organic silicon long-chain extender, stirring uniformly, heating to 80-120 ℃, and continuing to react for 5-8 h to obtain modified polyurethane;

wherein the mass ratio of the polyester polyol to the isocyanate monomer to the organosilicon long-chain extender is 2-5: 0.5-2: 1.