CN111850575A - Rust removing liquid capable of avoiding damage to steel surface caused by excessive acid corrosion - Google Patents
Rust removing liquid capable of avoiding damage to steel surface caused by excessive acid corrosion Download PDFInfo
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- CN111850575A CN111850575A CN202010728883.3A CN202010728883A CN111850575A CN 111850575 A CN111850575 A CN 111850575A CN 202010728883 A CN202010728883 A CN 202010728883A CN 111850575 A CN111850575 A CN 111850575A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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Abstract
The invention discloses a rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion, and relates to the technical field of metal surface treatment, wherein the specific method comprises the following steps: 1) preparing PSSMA modified ferroferric oxide nano particles; 2) preparing lanthanum-doped nano titanium dioxide; 3) preparing silver-lanthanum doped nano titanium dioxide nanoparticles; 4) modifying by using polyethyleneimine silver-lanthanum doped nano titanium dioxide nanoparticles; 5) the raw materials are respectively mixed evenly to obtain a component A and a component B, and the component A and the component B are filled into a container bottle with a middle interlayer to obtain the required rust remover. The rust remover provided by the invention can efficiently remove rust on the surface of steel, can deposit on the surface of base steel to form an integral smooth, uniform and compact acid-corrosion-resistant nano particle layer, can effectively prevent organic acid from carrying out acid corrosion on the base steel, and can avoid hydrogen embrittlement of the steel, thereby reducing the damage of the rust remover to the steel in the rust removing process.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion.
Background
The steel is easy to rust outdoors or outdoors, which not only affects the appearance quality, but also affects the normal operation of the processes of painting, bonding and the like, and if the processes are not timely processed, the materials are scrapped, and unnecessary economic loss is caused.
At present, two methods for removing oil and rust on the surface of steel are available, the traditional method is manual rust removal, in particular, the manual oil stain washing and steel brushing and scraping are used for removing rust, so that the labor intensity is high, a large amount of manpower and material resources are needed, the efficiency is low, and rust dust caused by rust removal flies everywhere to pollute the environment. The other method is chemical rust removal, which mainly utilizes chemical substances such as acid and the like to perform chemical reaction with oxides on the surface of steel to generate soluble or insoluble metal salts to be dissolved in aqueous solution to achieve the purpose of rust removal. For example, chinese patent CN2016109284900 discloses a preparation method of a steel rust removing liquid, which discloses a first mixture consisting of sodium metasilicate, polyethylene glycol, polyvinyl alcohol, sodium citrate, lecithin and water, a second mixture consisting of triethanolamine, ammonium molybdate, triethanolamine oleate, urea, sodium carboxymethylcellulose and water, then adding hydroxyethylidene diphosphonic acid into the first mixture, adding the second mixture under a heating and stirring state, then dropwise adding ethylenediamine and acetic anhydride, and uniformly mixing to obtain the steel rust removing liquid; for example, chinese patent CN2010105324206 discloses a normal temperature rust removing liquid for steel, which discloses a rust removing liquid composed of oxalic acid, sodium dodecyl sulfate, phosphoric acid, hydrochloric acid, fatty alcohol-polyoxyethylene ether, hexamethylenetetramine and water; the rust removing liquid disclosed in the process method contains acid solution, and the acid solution can react with the basic steel to generate hydrogen in the rust removing process, so that the hydrogen embrittlement phenomenon is generated on the steel, and the steel is damaged due to excessive acid corrosion, and the mechanical property of the steel is reduced.
Disclosure of Invention
The invention aims to provide a rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion, aiming at the existing problems.
The invention is realized by the following technical scheme:
a rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion is specifically prepared by the following steps:
1) sequentially adding a certain amount of PSSMA, ferric chloride hexahydrate and sodium acetate trihydrate into ethylene glycol according to the mass-to-volume ratio of 0.1-0.5g:1-1.2g:3-3.5g:40-50mL, violently stirring for 30-40min at the speed of 350-; in the invention, PSSMA and iron ions are added into ethylene glycol, sulfonic acid groups and carboxylic acid groups on PSSMA macromolecular chains are combined with the iron ions, acetate ions in sodium acetate added subsequently are combined with PSSMA macromolecular chains adsorbing the iron ions to form a macromolecular network structure, and under the high-temperature reaction, the macromolecular network decoupling strand leads the solution to become viscous;
2) in a reaction system, according to the volume ratio of tetrabutyl titanate to anhydrous ethanol to nitric acid to anhydrous ethanol of 17-20:50-55:10-13:20, dropwise and slowly adding a mixed solution of tetrabutyl titanate and anhydrous ethanol to a mixed solution consisting of nitric acid, anhydrous ethanol and a lanthanum nitrate solution with the concentration of 0.1-0.15mol/L under the condition of vigorous stirring at 500r/min under 400-; in the invention, lanthanum nitrate is adopted to carry out doping modification treatment on titanium dioxide, and lanthanum particles enter titanium dioxide crystal lattices, so that titanium dioxide crystal grains are obviously refined, and titanium dioxide with small particle size can be obtained;
3) dissolving silver nitrate into distilled water according to the mass-to-volume ratio of 1:25-30g/mL to obtain a silver nitrate solution, then adding the silver nitrate solution into the lanthanum-doped nano titanium dioxide ethanol mixed solution according to the volume ratio of 1:1:5-7, uniformly mixing, adding a polyvinylpyrrolidone ethanol solution, stirring and reacting at 70-80 ℃ for 7-8h, and obtaining silver-lanthanum-doped nano titanium dioxide nanoparticles containing 23-26% of silver element and 22-25% of titanium element through centrifugation, washing and drying; according to the invention, silver nitrate and lanthanum-doped nano titanium dioxide are used as raw materials, and the silver and lanthanum-doped nano titanium dioxide are tightly wrapped together through reaction, so that silver-lanthanum-doped nano titanium dioxide nanoparticles are formed, the formed composite nanoparticles have excellent acid and alkali resistance and are not easy to corrode by acid liquor, and the lanthanum-doped nano titanium dioxide is nanoparticles with small particle size, so that the formed silver-lanthanum-doped nano titanium dioxide nanoparticles have small particle size and good permeability, the pores of the nano particle layer formed by arrangement are reduced, and no groove-shaped gaps exist, so that the formed nano particle layer is smooth, uniform and compact as a whole;
4) adding silver-lanthanum doped nano titanium dioxide nanoparticles into a polyethyleneimine solution according to the mass volume ratio of 1:150-180g/mL, carrying out ultrasonic dispersion for 20-30min at 300-400W, then dropwise adding the solution into a glutaraldehyde aqueous solution with the volume fraction of 5-7% under the stirring condition of 300-400r/min at room temperature according to the volume ratio of 1:1.5-2 of the glutaraldehyde aqueous solution to the polyethyleneimine solution, continuously stirring for 30-40min, washing the obtained product with distilled water until the filtrate is clear, and drying to obtain PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles; in the invention, the silver-lanthanum doped nano titanium dioxide nano particles are modified by adopting cationic polyelectrolyte polyethyleneimine, so that the surfaces of the silver-lanthanum doped nano titanium dioxide nano particles are provided with positive charges;
5) mixing and stirring 20-25% of organic acid and distilled water uniformly according to mass percent, adding 2-4% of disodium ethylene diamine tetraacetate, 2.5-3.5% of sodium gluconate and 1-1.5% of sodium citrate into the mixed solution, stirring uniformly, adding 3-5% of PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles and 0.5-1% of fatty alcohol-polyoxyethylene ether, mixing and stirring for 1-2h to obtain a component A, ultrasonically dispersing PSSMA modified ferroferric oxide nanoparticles into deionized water, adding a small amount of fatty alcohol-polyoxyethylene ether, mixing uniformly to obtain a component B with the concentration of 20-30mg/mL and the mass percent of fatty alcohol-polyoxyethylene ether being 0.5-1%, then respectively filling the component A and the component B into a container with an intermediate interlayer, the required rust remover can be obtained; in the invention, the rust remover is actually composed of a component A and a component B, the component A and the component B are matched to achieve the best effect, in the rust removing process, firstly, a rusty steel workpiece is immersed into a component B solution, PSSMA modified ferroferric oxide nano particles in the component B have magnetism, the PSSMA modified ferroferric oxide nano particles can permeate into the surface of a basic steel through a rusty layer on the surface of the workpiece and are attached to the surface of the steel to form a ferroferric oxide nano particle layer, then, the workpiece is immersed into a component A solution, organic acid in the component A can react with iron rust to generate soluble salt, and in the rust removing process, the contained PEI modified silver-lanthanum doped nano titanium dioxide nano particles take the ferroferric oxide nano particle layer formed on the surface of the basic steel as a base layer, silver-lanthanum doped nano titanium dioxide nano particles with excellent acid corrosion resistance are deposited on the surface of the PEI modified silver-lanthanum doped nano titanium dioxide nano particles, the formed nano granular layer has a compact structure and is uniformly distributed, and the acid corrosion of the base steel by the organic acid can be effectively prevented, so that the hydrogen embrittlement phenomenon of the steel can be avoided, and the damage of the rust remover to the steel in the rust removing process of the steel can be reduced.
Further, the use method of the rust remover comprises the following steps: pouring the component B solution into a container, stirring for 20-30min at the rotation speed of 100-150r/min, immersing the steel workpiece to be treated into the component B solution, soaking for 20-25min at room temperature, taking out the workpiece, draining, pouring the component A solution into another container, stirring for 15-20min at the temperature of 70-80 ℃ and the rotation speed of 100-150r/min, immersing the workpiece into the component A solution, soaking for 15-20min, taking out, washing and drying the workpiece with distilled water.
Compared with the prior art, the invention has the following advantages:
the rust remover provided by the invention comprises a component A and a component B, can remove rust on the surface of steel by matching use, can deposit silver-lanthanum doped nano titanium dioxide nanoparticles with excellent acid corrosion resistance on the surface of base steel to form a nano particle layer which is smooth, uniform and compact as a whole, and can effectively prevent organic acid from carrying out acid corrosion on the base steel, so that the hydrogen embrittlement phenomenon of the steel can be avoided, and the damage of the rust remover to the steel in the rust removing process of the steel can be reduced.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion is specifically prepared by the following steps:
1) sequentially adding a certain amount of PSSMA, ferric chloride hexahydrate and sodium acetate trihydrate into ethylene glycol according to the mass-to-volume ratio of 0.1-0.5g:1-1.2g:3-3.5g:40-50mL, violently stirring for 30-40min at the speed of 350-;
2) in a reaction system, according to the volume ratio of tetrabutyl titanate to anhydrous ethanol to nitric acid to anhydrous ethanol of 17-20:50-55:10-13:20, dropwise and slowly adding a mixed solution of tetrabutyl titanate and anhydrous ethanol to a mixed solution consisting of nitric acid, anhydrous ethanol and a lanthanum nitrate solution with the concentration of 0.1-0.15mol/L under the condition of vigorous stirring at 500r/min under 400-;
3) dissolving silver nitrate into distilled water according to the mass-to-volume ratio of 1:25-30g/mL to obtain a silver nitrate solution, then adding the silver nitrate solution into the lanthanum-doped nano titanium dioxide ethanol mixed solution according to the volume ratio of 1:1:5-7, uniformly mixing, adding a polyvinylpyrrolidone ethanol solution, stirring and reacting at 70-80 ℃ for 7-8h, and obtaining silver-lanthanum-doped nano titanium dioxide nanoparticles containing 23-26% of silver element and 22-25% of titanium element through centrifugation, washing and drying;
4) adding silver-lanthanum doped nano titanium dioxide nanoparticles into a polyethyleneimine solution according to the mass volume ratio of 1:150-180g/mL, carrying out ultrasonic dispersion for 20-30min at 300-400W, then dropwise adding the solution into a glutaraldehyde aqueous solution with the volume fraction of 5-7% under the stirring condition of 300-400r/min at room temperature according to the volume ratio of 1:1.5-2 of the glutaraldehyde aqueous solution to the polyethyleneimine solution, continuously stirring for 30-40min, washing the obtained product with distilled water until the filtrate is clear, and drying to obtain PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles;
5) mixing and stirring 20-25% of organic acid and distilled water uniformly according to mass percent, adding 2-4% of disodium ethylene diamine tetraacetate, 2.5-3.5% of sodium gluconate and 1-1.5% of sodium citrate into the mixed solution, stirring uniformly, adding 3-5% of PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles and 0.5-1% of fatty alcohol-polyoxyethylene ether, mixing and stirring for 1-2h to obtain a component A, ultrasonically dispersing PSSMA modified ferroferric oxide nanoparticles into deionized water, adding a small amount of fatty alcohol-polyoxyethylene ether, mixing uniformly to obtain a component B with the concentration of 20-30mg/mL and the mass percent of fatty alcohol-polyoxyethylene ether being 0.5-1%, then respectively filling the component A and the component B into a container with an intermediate interlayer, the required rust remover can be obtained.
Further, the use method of the rust remover comprises the following steps: pouring the component B solution into a container, stirring for 20-30min at the rotation speed of 100-150r/min, immersing the steel workpiece to be treated into the component B solution, soaking for 20-25min at room temperature, taking out the workpiece, draining, pouring the component A solution into another container, stirring for 15-20min at the temperature of 70-80 ℃ and the rotation speed of 100-150r/min, immersing the workpiece into the component A solution, soaking for 15-20min, taking out, washing and drying the workpiece with distilled water.
Example 2
A rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion is specifically prepared by the following steps:
1) sequentially adding a certain amount of PSSMA, ferric chloride hexahydrate and sodium acetate trihydrate into ethylene glycol according to the mass-to-volume ratio of 0.1-0.5g:1-1.2g:3-3.5g:40-50mL, violently stirring for 30-40min at the speed of 350-;
2) in a reaction system, according to the volume ratio of tetrabutyl titanate to anhydrous ethanol to nitric acid to anhydrous ethanol of 17-20:50-55:10-13:20, dropwise and slowly adding a mixed solution of tetrabutyl titanate and anhydrous ethanol to a mixed solution consisting of nitric acid, anhydrous ethanol and a lanthanum nitrate solution with the concentration of 0.1-0.15mol/L under the condition of vigorous stirring at 500r/min under 400-;
3) dissolving silver nitrate into distilled water according to the mass-to-volume ratio of 1:25-30g/mL to obtain a silver nitrate solution, then adding the silver nitrate solution into the lanthanum-doped nano titanium dioxide ethanol mixed solution according to the volume ratio of 1:1:5-7, uniformly mixing, adding a polyvinylpyrrolidone ethanol solution, stirring and reacting at 70-80 ℃ for 7-8h, and obtaining silver-lanthanum-doped nano titanium dioxide nanoparticles containing 23-26% of silver element and 22-25% of titanium element through centrifugation, washing and drying;
4) adding silver-lanthanum doped nano titanium dioxide nanoparticles into a polyethyleneimine solution according to the mass volume ratio of 1:150-180g/mL, carrying out ultrasonic dispersion for 20-30min at 300-400W, then dropwise adding the solution into a glutaraldehyde aqueous solution with the volume fraction of 5-7% under the stirring condition of 300-400r/min at room temperature according to the volume ratio of 1:1.5-2 of the glutaraldehyde aqueous solution to the polyethyleneimine solution, continuously stirring for 30-40min, washing the obtained product with distilled water until the filtrate is clear, and drying to obtain PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles;
5) mixing and stirring 20-25% of organic acid and distilled water uniformly according to mass percent, adding 2-4% of disodium ethylene diamine tetraacetate, 2.5-3.5% of sodium gluconate and 1-1.5% of sodium citrate into the mixed solution, stirring uniformly, adding 3-5% of PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles and 0.5-1% of fatty alcohol-polyoxyethylene ether, mixing and stirring for 1-2h to obtain a component A, ultrasonically dispersing PSSMA modified ferroferric oxide nanoparticles into deionized water, adding a small amount of fatty alcohol-polyoxyethylene ether, mixing uniformly to obtain a component B with the concentration of 20-30mg/mL and the mass percent of fatty alcohol-polyoxyethylene ether being 0.5-1%, then respectively filling the component A and the component B into a container with an intermediate interlayer, the required rust remover can be obtained.
Further, the use method of the rust remover comprises the following steps: pouring the component B solution into a container, stirring for 20-30min at the rotation speed of 100-150r/min, immersing the steel workpiece to be treated into the component B solution, soaking for 20-25min at room temperature, taking out the workpiece, draining, pouring the component A solution into another container, stirring for 15-20min at the temperature of 70-80 ℃ and the rotation speed of 100-150r/min, immersing the workpiece into the component A solution, soaking for 15-20min, taking out, washing and drying the workpiece with distilled water.
Example 3
A rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion is specifically prepared by the following steps:
1) sequentially adding a certain amount of PSSMA, ferric chloride hexahydrate and sodium acetate trihydrate into ethylene glycol according to the mass-to-volume ratio of 0.1-0.5g:1-1.2g:3-3.5g:40-50mL, violently stirring for 30-40min at the speed of 350-;
2) in a reaction system, according to the volume ratio of tetrabutyl titanate to anhydrous ethanol to nitric acid to anhydrous ethanol of 17-20:50-55:10-13:20, dropwise and slowly adding a mixed solution of tetrabutyl titanate and anhydrous ethanol to a mixed solution consisting of nitric acid, anhydrous ethanol and a lanthanum nitrate solution with the concentration of 0.1-0.15mol/L under the condition of vigorous stirring at 500r/min under 400-;
3) dissolving silver nitrate into distilled water according to the mass-to-volume ratio of 1:25-30g/mL to obtain a silver nitrate solution, then adding the silver nitrate solution into the lanthanum-doped nano titanium dioxide ethanol mixed solution according to the volume ratio of 1:1:5-7, uniformly mixing, adding a polyvinylpyrrolidone ethanol solution, stirring and reacting at 70-80 ℃ for 7-8h, and obtaining silver-lanthanum-doped nano titanium dioxide nanoparticles containing 23-26% of silver element and 22-25% of titanium element through centrifugation, washing and drying;
4) adding silver-lanthanum doped nano titanium dioxide nanoparticles into a polyethyleneimine solution according to the mass volume ratio of 1:150-180g/mL, carrying out ultrasonic dispersion for 20-30min at 300-400W, then dropwise adding the solution into a glutaraldehyde aqueous solution with the volume fraction of 5-7% under the stirring condition of 300-400r/min at room temperature according to the volume ratio of 1:1.5-2 of the glutaraldehyde aqueous solution to the polyethyleneimine solution, continuously stirring for 30-40min, washing the obtained product with distilled water until the filtrate is clear, and drying to obtain PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles;
5) mixing and stirring 20-25% of organic acid and distilled water uniformly according to mass percent, adding 2-4% of disodium ethylene diamine tetraacetate, 2.5-3.5% of sodium gluconate and 1-1.5% of sodium citrate into the mixed solution, stirring uniformly, adding 3-5% of PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles and 0.5-1% of fatty alcohol-polyoxyethylene ether, mixing and stirring for 1-2h to obtain a component A, ultrasonically dispersing PSSMA modified ferroferric oxide nanoparticles into deionized water, adding a small amount of fatty alcohol-polyoxyethylene ether, mixing uniformly to obtain a component B with the concentration of 20-30mg/mL and the mass percent of fatty alcohol-polyoxyethylene ether being 0.5-1%, then respectively filling the component A and the component B into a container with an intermediate interlayer, the required rust remover can be obtained.
Further, the use method of the rust remover comprises the following steps: pouring the component B solution into a container, stirring for 20-30min at the rotation speed of 100-150r/min, immersing the steel workpiece to be treated into the component B solution, soaking for 20-25min at room temperature, taking out the workpiece, draining, pouring the component A solution into another container, stirring for 15-20min at the temperature of 70-80 ℃ and the rotation speed of 100-150r/min, immersing the workpiece into the component A solution, soaking for 15-20min, taking out, washing and drying the workpiece with distilled water.
Control group 1: lanthanum nitrate in the process step (2) is removed, and the rest is the same as that in the example 1, so that the rust remover is prepared.
Control group 2: the rust remover was the same as in example 1 except that the component B was removed and the rust remover consisted of the component A alone.
Control group 3: and removing the component B, wherein the rust remover only consists of the component A, and the PEI modified silver-lanthanum doped nano titanium dioxide nano particles in the component A are replaced by PSSMA modified ferroferric oxide nano particles, and the rest is the same as the example 1.
Control group 4: according to the mass percentage, 20% of organic acid and distilled water are mixed and stirred uniformly, then 2% of disodium ethylene diamine tetraacetate, 2.5% of sodium gluconate and 1% of sodium citrate which are weighed are added into the mixed solution and stirred uniformly, 0.5% of fatty alcohol-polyoxyethylene ether is added, and the mixed solution and the stirred mixture are mixed for 1 hour to obtain the rust remover.
Test experiments:
test experiment 1: test of Rust removal Effect
Selecting a Q235 low-carbon steel of 80X 40X 3mm specification, exposing an un-corroded steel plate to air according to the corrosion grade of the surface of the steel plate specified in GB/T8923.1-2011, standing for 60D under the conditions of average temperature and humidity of 25 ℃ and 65% respectively, rusting until the visual corrosion grade is C grade (A: a steel surface which is covered by a large area and hardly rusted with iron, B: a steel surface which is corroded and has scale peeling off, C scale peeling off due to corrosion or can be scraped off, and a steel surface which is slightly corroded, D: a steel surface which has scale peeling off due to corrosion and has normally corroded), removing surface floating rust by using a metal brush, cleaning the surface of the steel plate by using distilled water, placing the steel plate in a drying box for drying, and then treating the steel plate by using the rust remover provided in example 1 and the comparison groups 1-4, the rust removal temperature is 80 ℃, the rust removal time is 17min, and the results are as follows: the rust on the steel plate was completely removed.
According to the test result, the rust remover provided by the application can quickly remove rust on the surface of the steel plate.
Test experiment 2: test of paint film adhesion on steel plate surface after rust removal
Cleaning and drying the derusted steel plate, uniformly coating a layer of commercially available water-based high-gloss paint on the surface, after the surface is completely dried, carrying out a lattice drawing experiment on the surface of the steel plate by using a lattice drawing knife, and comparing the adhesion grade of the paint film disclosed by GB/T1720-1979, wherein the results are as follows: the adhesion of the paint film on the surface of the steel plate in the embodiment 1, the comparison group 3 and the comparison group 4 reaches grade 1, and the adhesion of the paint film on the surface of the steel plate in the comparison group 2 reaches grade 2.
According to the test results, the rust remover provided by the application has the advantages that the adhesive force of a paint film on the surface of a steel plate after rust removal is excellent, and the subsequent anti-corrosion treatment effect on the steel plate is good.
Test experiment 3: corrosion resistance test of steel plate surface after rust removal
Under the condition of room temperature, the steel plate sample after rust removal is placed into a sodium chloride solution with the concentration of 3.5% for soaking, the color change of the sample system is observed, and the results are as follows: when the steel plate in the control group 4 is soaked for 3 hours, the color of the system brine has obviously changed, and the surface of the steel plate is rusted; when the steel plate in the control group 3 is soaked for 5 hours, the color of the system brine has obviously changed, and the surface of the steel plate is rusted; when the steel plate in the control group 2 is soaked for 7 hours, the color of the system brine has obviously changed, and the surface of the steel plate is rusted; when the steel plate in the control group 1 is soaked for 6 hours, the color of the system brine has obviously changed, and the surface of the steel plate is rusted; when the steel plate in the embodiment 1 is soaked for 8 hours, the color of the brine of the system is not obviously changed, and the surface of the steel plate is not rusted.
According to the rust remover, a compact protective film is formed on the surface of a steel plate after rust removal, so that the steel plate after rust removal is not prone to secondary corrosion.
Test experiment 4: shape difference of steel plate surface after rust removal
And (3) carrying out surface scanning electron microscope analysis on the derusted steel plate sample, wherein the result is as follows: the steel plates of example 1 and comparative group 4 were smooth and flat, the steel plates of comparative groups 1 to 3 were rough, and the degree of roughness was 2< 1< 3.
According to the test result, the surface of the steel plate after rust removal is smooth and flat by the rust remover.
Test experiment 5: yield strength test of derusted steel plate
According to GB/T228-2002 metal material room temperature tensile test method, the yield strength test is carried out on the steel plate sample after rust removal, and the results are as follows: the yield strength of the steel sheet in example 1 was increased by 27.8%, the yield strength of the steel sheet in control 1 was increased by 10.6%, the yield strength of the steel sheet in control 2 was increased by 19.7%, and the yield strength of the steel sheet in control 3 was increased by 6.2% as compared to the steel sheet in control 4.
According to the test result, the rust remover provided by the application has the advantages that the damage to steel is minimum, and the steel after rust removal still has good strength.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (7)
1. A rust removing liquid capable of avoiding damage to the surface of steel due to excessive acid corrosion is characterized by comprising the following specific preparation methods:
1) sequentially adding a certain amount of PSSMA, ferric chloride hexahydrate and sodium acetate trihydrate into ethylene glycol, violently stirring for 30-40min, then transferring into a reaction kettle containing a polytetrafluoroethylene reactor lining, reacting for 10-12h at the temperature of 200-;
2) dropwise and slowly adding a proper amount of mixed solution of tetrabutyl titanate and absolute ethyl alcohol into mixed solution consisting of nitric acid, absolute ethyl alcohol and a lanthanum nitrate solution under the condition of violent stirring, continuously stirring for 2-3h at room temperature, aging for 12-15h at room temperature after stirring is finished, drying, and roasting for 2-3h at the temperature of 500-550 ℃ to obtain lanthanum-doped nano titanium dioxide;
3) dissolving a proper amount of silver nitrate in distilled water to obtain a silver nitrate solution, adding the lanthanum-doped nano titanium dioxide ethanol mixed solution, uniformly mixing, adding a polyvinylpyrrolidone ethanol solution, stirring and reacting at 70-80 ℃ for 7-8h, centrifuging, washing and drying to obtain silver-lanthanum-doped nano titanium dioxide nanoparticles;
4) adding a proper amount of silver-lanthanum doped nano titanium dioxide nano particles into a polyethyleneimine solution, performing ultrasonic dispersion for 20-30min, then dropwise adding the silver-lanthanum doped nano titanium dioxide nano particles into a glutaraldehyde aqueous solution under the stirring conditions of room temperature and 400r/min, continuously stirring for 30-40min, washing the obtained product with distilled water until filtrate is clear, and drying to obtain PEI modified silver-lanthanum doped nano titanium dioxide nano particles;
5) mixing and stirring organic acid and distilled water uniformly, adding weighed disodium ethylene diamine tetraacetate, sodium gluconate and sodium citrate into the mixed solution, stirring uniformly, adding PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles and fatty alcohol-polyoxyethylene ether, mixing and stirring for 1-2 hours to obtain a component A, ultrasonically dispersing PSSMA modified ferroferric oxide nanoparticles into deionized water, adding a small amount of fatty alcohol-polyoxyethylene ether, mixing uniformly to obtain a component B, and respectively filling the component A and the component B into containers with intermediate layers to obtain the required rust remover.
2. The rust removing liquid capable of avoiding the damage to the steel surface caused by the excessive acid corrosion as claimed in claim 1, wherein in the process step 1), the mass volume ratio of the PSSMA, the ferric chloride hexahydrate, the sodium acetate trihydrate and the ethylene glycol is 0.1-0.5g:1-1.2g:3-3.5g:40-50 mL; the rotating speed of the violent stirring is 350-400 r/min; the drying temperature is 30-35 ℃, and the drying time is 6-7 h.
3. The rust removing liquid capable of avoiding damage to the steel surface due to excessive acid corrosion as claimed in claim 1, wherein in the process step 2), the volume ratio of tetrabutyl titanate, absolute ethyl alcohol, nitric acid and absolute ethyl alcohol in the reaction system is 17-20:50-55:10-13: 20; the concentration of the lanthanum nitrate solution is 0.1-0.15 mol/L; the rotating speed of the violent stirring is 400-500 r/min; in the lanthanum-doped nano titanium dioxide, the molar ratio of lanthanum to titanium is 1.5-2: 100.
4. The rust removing liquid capable of avoiding the damage to the steel surface caused by the excessive acid corrosion as claimed in claim 1, wherein in the process step 3), the mass-to-volume ratio of the silver nitrate to the distilled water is 1:25-30 g/mL; the volume ratio of the silver nitrate solution to the lanthanum-doped nano titanium dioxide ethanol mixed solution to the polyvinylpyrrolidone ethanol solution is 1:1: 5-7; the silver-lanthanum doped nano titanium dioxide nano particles contain 23-26% of silver element and 22-25% of titanium element.
5. The rust removing liquid capable of avoiding the damage to the steel surface caused by the excessive acid corrosion as claimed in claim 1, wherein in the process step 4), the mass-to-volume ratio of the silver-lanthanum doped nano titanium dioxide nano particles to the polyethyleneimine solution is 1:150-180 g/mL; the ultrasonic power is 300-400W; the volume fraction of the glutaraldehyde aqueous solution is 5-7%, and the volume ratio of the glutaraldehyde aqueous solution to the polyethyleneimine solution is 1: 1.5-2.
6. The rust removing liquid capable of avoiding damage to the steel surface due to excessive acid corrosion as claimed in claim 1, wherein in the process step 5), the component A comprises, by mass, 20-25% of an organic acid, 2-4% of disodium ethylene diamine tetraacetate, 2.5-3.5% of sodium gluconate, 1-1.5% of sodium citrate, 3-5% of PEI modified silver-lanthanum doped nano titanium dioxide nanoparticles, 0.5-1% of fatty alcohol-polyoxyethylene ether, and the balance of distilled water; in the component B, the concentration of PSSMA modified ferroferric oxide nano particles is 20-30mg/mL, and the mass percent of fatty alcohol-polyoxyethylene ether is 0.5-1%.
7. A rust removing liquid capable of avoiding damage to the surface of a steel product due to excessive acid corrosion, as claimed in claim 1, wherein the rust removing agent is used by the following method: pouring the component B solution into a container, stirring for 20-30min at the rotation speed of 100-150r/min, immersing the steel workpiece to be treated into the component B solution, soaking for 20-25min at room temperature, taking out the workpiece, draining, pouring the component A solution into another container, stirring for 15-20min at the temperature of 70-80 ℃ and the rotation speed of 100-150r/min, immersing the workpiece into the component A solution, soaking for 15-20min, taking out, washing and drying the workpiece with distilled water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728883.3A CN111850575A (en) | 2020-07-27 | 2020-07-27 | Rust removing liquid capable of avoiding damage to steel surface caused by excessive acid corrosion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010728883.3A CN111850575A (en) | 2020-07-27 | 2020-07-27 | Rust removing liquid capable of avoiding damage to steel surface caused by excessive acid corrosion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637975A (en) * | 2021-08-26 | 2021-11-12 | 王霞 | Metal cleaning agent suitable for cleaning stainless steel plate workpiece |
| CN115430168A (en) * | 2022-08-16 | 2022-12-06 | 中国石油化工股份有限公司 | Method and production system for controlling titanium material corrosion of vinyl acetate and polyvinyl alcohol production device |
-
2020
- 2020-07-27 CN CN202010728883.3A patent/CN111850575A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637975A (en) * | 2021-08-26 | 2021-11-12 | 王霞 | Metal cleaning agent suitable for cleaning stainless steel plate workpiece |
| CN115430168A (en) * | 2022-08-16 | 2022-12-06 | 中国石油化工股份有限公司 | Method and production system for controlling titanium material corrosion of vinyl acetate and polyvinyl alcohol production device |
| CN115430168B (en) * | 2022-08-16 | 2023-08-25 | 中国石油化工股份有限公司 | Method and production system for controlling corrosion of titanium material |
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