High-strength rare earth weathering steel and preparation process thereof

Abstract

The application discloses a high-strength rare earth weather-resistant steel and a preparation process thereof, and relates to the technical field of weather-resistant steel.The rare earth elements lanthanum and cerium are added into the weather-resistant steel as raw materials, so that the grain refinement of the weather-resistant steel matrix can be effectively promoted, the microstructure and performance of the weather-resistant steel are improved, and the weather resistance and strength of the steel material are improved.The polysilsesquioxane sol A and the polysilsesquioxane sol B are prepared, the rare earth salt lanthanum chloride is added, the compactness of the coating is enhanced, and the corrosion resistance and weather resistance of the rare earth weather-resistant steel are improved.The compounding of the polysilsesquioxane sol A and the polysilsesquioxane sol B makes the corrosion-resistant coating on the surface of the weather-resistant steel more compact, and the corrosion resistance of the weather-resistant steel is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of weather-resistant steel, in particular to a high-strength rare earth weather-resistant steel and a preparation process thereof. BACKGROUND

[0002] With the development of the manufacturing industry, the corrosion resistance, weather resistance and mechanical properties of steel are increasingly important. Rare earth elements can effectively promote the grain refinement of the steel matrix when added to the steel as raw materials, improve the microstructure and properties of the steel, and have unique advantages in corrosion resistance, high-temperature resistance and strength improvement. Weather-resistant steel is widely used in structures such as bridges, buildings and ships, but its corrosion resistance still needs to be further improved in environments containing corrosive substances. With the progress of science and technology and the demand of industrial applications, developing a high-strength rare earth weather-resistant steel that can not only meet the requirements of use in complex environments but also effectively prolong the service life of the steel has become an important research direction of the steel industry.

[0003] In order to solve the above problems and improve the corrosion resistance of steel, the application provides a high-strength rare earth weather-resistant steel and a preparation process thereof. SUMMARY

[0004] The application aims to provide a high-strength rare earth weather-resistant steel and a preparation process thereof to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0006] A preparation process of a high-strength rare earth weather-resistant steel, comprising the following steps:

[0007] Step one: take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum and cerium, smelt and cast to obtain a steel ingot, heat to 1200-1220 DEG C for 3-4 h, roll, cool, and clean to obtain a rare earth weather-resistant steel;

[0008] Step two: take nickel-plated carbon nanotubes, glycidyl ether oxypropyl trimethoxysilane and ethanol, heat to 70-75 DEG C, react for 50-70 min, then drop a mixed solution of tetraethyl orthosilicate, lanthanum chloride, methyl triethoxysilane, ethanol and deionized water, react at 70-75 DEG C for 50-70 min to obtain polysiloxane sol A;

[0009] Take carbon nanotubes, glycidyl ether oxypropyl trimethoxysilane and ethanol, heat to 70-75 DEG C, react for 50-70 min, then drop a mixed solution of tetraethyl orthosilicate, lanthanum chloride, methyl triethoxysilane, ethanol and deionized water, react at 70-75 DEG C for 50-70 min to obtain polysiloxane sol B;

[0010] Step three: spraying polysiloxane sol B on the surface of the rare earth weathering steel, drying, and then spraying polysiloxane sol A on the surface of the polysiloxane sol B, drying, to obtain the high-strength rare earth weathering steel.

[0011] More preferably, the polysiloxane sol A is dried in a horizontal magnetic field with a magnetic field strength of 0.5T-0.6T.

[0012] More preferably, the rare earth weathering steel is composed of the following components: 0.20wt%-0.25wt% of silicon, 0.05wt%-0.06wt% of carbon, 0.55wt%-1.0wt% of manganese, 0.55wt%-0.60wt% of chromium, 0.45wt%-0.55wt% of copper, 0.25wt%-0.35wt% of nickel, 0.0011wt%-0.0012wt% of calcium, 0.013wt%-0.016wt% of titanium, 0.001wt%-0.012wt% of phosphorus, 0.001wt%-0.002wt% of sulfur, 0.0004wt%-0.006wt% of lanthanum, and 0.0003wt%-0.005wt% of cerium.

[0013] More preferably, the preparation method of the nickel-plated carbon nanotube comprises the following steps: adding the treated carbon nanotube into a nickel plating solution, reacting at 35-40℃ for 30-40min, taking out, washing, and drying, to obtain the nickel-plated carbon nanotube.

[0014] More preferably, the nickel plating solution comprises the following components: nickel chloride hexahydrate, nickel sulfate hexahydrate, ammonium chloride, sodium citrate, sodium hypophosphite, lead nitrate, and phytic acid, with deionized water as a solvent.

[0015] More preferably, the preparation method of the treated carbon nanotube comprises the following steps: taking carbon nanotubes and concentrated nitric acid solution, oscillating at 75-80℃ for 7-9h, adding deionized water, and performing suction filtration and washing until the carbon nanotubes are neutral, and drying, to obtain the acidized carbon nanotube; taking the acidized carbon nanotube, adding deionized water, and ultrasonic dispersing, adding stannous chloride dihydrate sensitizer and hydrochloric acid, and oscillating for 15-20min; filtering, washing, and drying, adding 100mL deionized water, ultrasonic dispersing, adding palladium dichloride and hydrochloric acid, oscillating for 15-20min, and filtering, washing, and drying, to obtain the treated carbon nanotube.

[0016] More preferably, the magnetic field strength is 0.5T.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] Compared with the prior art, the present application has the following beneficial effects:1. This invention adds rare earth elements lanthanum and cerium as raw materials to weathering steel, which can effectively promote grain refinement of the weathering steel matrix, improve the microstructure and properties of weathering steel, and enhance the weather resistance and strength of the steel.

[0019] 2. This invention prepares polysilsesquioxane sol A and polysilsesquioxane sol B. By adding the rare earth salt lanthanum chloride, the density of the coating is enhanced, thereby improving the corrosion resistance and weather resistance of the rare earth weathering steel. The combination of polysilsesquioxane sol A and polysilsesquioxane sol B makes the corrosion-resistant coating on the surface of the weathering steel more dense, thus improving the corrosion resistance of the weathering steel.

[0020] 3. Nickel-plated carbon nanotubes were added to polysilsesquioxane sol A. A layer of nickel was plated onto the carbon nanotubes using a nickel plating solution. Nickel is a ferromagnetic metal. This nickel plating creates a dense oxide protective layer on the surface of the carbon nanotubes, hindering the invasion of corrosive media and improving the corrosion resistance of the coating. This invention also added phytic acid to the nickel plating solution, which further enhanced the corrosion resistance of the carbon nanotubes. The nickel plating also made the carbon nanotubes magnetic, allowing them to disperse better under a magnetic field, thus improving the corrosion resistance of the rare earth weathering steel. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The sources of the substances involved in this invention are not particularly limited. Exemplary examples include: carbon nanotubes with a diameter of 10-100 nm and a length of 1-50 μm, which can be purchased from Shenzhen Nanoport Co., Ltd.

[0023] Example 1: A preparation process for high-strength rare earth weathering steel, comprising the following steps:

[0024] Step 1: Preparation of rare earth weathering steel:

[0025] Silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, and cerium are taken, smelted, and cast to obtain steel ingots. The ingots are heated to 1210℃ and held for 3.5 hours, then rolled, cooled, and cleaned to obtain rare earth weathering steel.

[0026] The rare earth weathering steel is composed of the following components: 0.22wt% silicon, 0.055wt% carbon, 0.8wt% manganese, 0.58wt% chromium, 0.50wt% copper, 0.30wt% nickel, 0.0011wt% calcium, 0.015wt% titanium, 0.0011wt% phosphorus, 0.0015wt% sulfur, 0.0005wt% lanthanum, and 0.0004wt% cerium, in terms of mass fraction.

[0027] Step two: preparation of nickel-plated carbon nanotubes:

[0028] Take 5g carbon nanotubes, 150mL of concentrated nitric acid solution, and shake at 77℃ for 8h. Add 150mL of deionized water, and filter, wash, and dry until the carbon nanotubes are neutral. Dry to obtain acidified carbon nanotubes. Take 0.1g of acidified carbon nanotubes, add 100mL of deionized water, and ultrasonically disperse. Add 1g of stannous chloride dihydrate sensitizer and 4g of hydrochloric acid, and shake for 18min. Filter, wash, and dry. Add 100mL of deionized water, ultrasonically disperse, add 0.04g of palladium dichloride, and 1g of hydrochloric acid. Shake for 18min, filter, wash, and dry to obtain treated carbon nanotubes. Add the treated carbon nanotubes to a nickel plating solution, react at 35℃ for 30min, remove, wash, and dry to obtain nickel-plated carbon nanotubes.

[0029] The nickel plating solution includes the following components: 0.2mol / L nickel chloride hexahydrate, 0.1mol / L nickel sulfate hexahydrate, 1.6mol / L ammonium chloride, 0.1mol / L sodium citrate, 0.6mol / L sodium hypophosphite, 0.004mol / L lead nitrate, and 0.005mol / L phytic acid, with deionized water as the solvent.

[0030] Step three:

[0031] Preparation of polysilsesquioxane sol A:

[0032] Take 0.2g of nickel-plated carbon nanotubes, 0.9g of glycidyl ether oxypropyltrimethoxysilane, and 40mL of ethanol. Heat to 72℃ and react for 60min. Then add 4g of tetraethyl orthosilicate, 0.8g of lanthanum chloride, 70g of methyltriethoxysilane, 20mL of ethanol, and 20mL of deionized water. React at 73℃ for 60min to obtain polysilsesquioxane sol A.

[0033] Preparation of polysilsesquioxane sol B:

[0034] Take 0.2g carbon nanotube, 0.9g glycidyl ether propyl trimethoxysilane, 40mL ethanol, heated to 72℃, reaction for 60min, then drop 4g ethyl silicate, 0.8g lanthanum chloride, 70g methyl triethoxysilane, 20mL ethanol, 20mL deionized water mixture, at 72℃, reaction for 60min, to get polysilicic acid sol B;

[0035] Step four: preparation of high-strength rare earth weathering steel:

[0036] Spray polysilicic acid sol B on the surface of rare earth weathering steel, the spraying thickness is 3μm, dry at 25℃ for 1h, then spray polysilicic acid sol A on the surface of polysilicic acid sol B, the spraying thickness is 3μm, dry at 25℃ in horizontal magnetic field for 1h, the magnetic field strength is 0.5T, to get high-strength rare earth weathering steel.

[0037] Example 2: a preparation process of high-strength rare earth weathering steel, including the following steps:

[0038] Step one: preparation of rare earth weathering steel:

[0039] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, cerium, smelt, cast, to get steel ingot, heated to 1200℃ for 3h, rolled, cooled, washed, to get rare earth weathering steel;

[0040] The rare earth weathering steel is composed of the following components: 0.20wt% silicon, 0.05wt% carbon, 0.55wt% manganese, 0.55wt% chromium, 0.45wt% copper, 0.25wt% nickel, 0.0011wt% calcium, 0.013wt% titanium, 0.001wt% phosphorus, 0.001wt% sulfur, 0.0004wt% lanthanum, 0.0003wt% cerium;

[0041] Step two: preparation of nickel-plated carbon nanotubes:

[0042] Take 5g carbon nanotube, 150mL concentrated nitric acid solution, oscillate at 75℃ for 7h, add 150mL deionized water, filter, wash, until the carbon nanotube is neutral, dry, to get acidified carbon nanotube; take 0.1g acidified carbon nanotube, add 100mL deionized water, ultrasonic dispersion, add 1g stannous chloride dihydrate sensitizer, 4g hydrochloric acid, oscillate for 15min; filter, wash, dry, add 100mL deionized water, ultrasonic dispersion, add 0.04g palladium dichloride, 1g hydrochloric acid, oscillate for 15min, filter, wash, dry, to get treated carbon nanotube; add the treated carbon nanotube into nickel plating solution, react at 35℃ for 30min, take out, wash, dry, to get nickel-plated carbon nanotube;

[0043] The nickel plating solution comprises the following components: 0.2 mol / L nickel chloride hexahydrate, 0.1 mol / L nickel sulfate hexahydrate, 1.6 mol / L ammonium chloride, 0.1 mol / L sodium citrate, 0.6 mol / L sodium hypophosphite, 0.004 mol / L lead nitrate, 0.005 mol / L phytic acid, and deionized water as a solvent;

[0044] Step three:

[0045] Preparation of polysilsesquioxane sol A:

[0046] Take 0.2 g of nickel-plated carbon nanotubes, 0.9 g of glycidyl ether oxypropyl trimethoxysilane, 40 mL of ethanol, and heat to 70℃ for 50 min. Then add 4 g of tetraethyl orthosilicate, 0.8 g of lanthanum chloride, 70 g of methyl triethoxysilane, 20 mL of ethanol, and 20 mL of deionized water. React at 70℃ for 50 min to obtain polysilsesquioxane sol A.

[0047] Preparation of polysilsesquioxane sol B:

[0048] Take 0.2 g of carbon nanotubes, 0.9 g of glycidyl ether oxypropyl trimethoxysilane, 40 mL of ethanol, and heat to 70℃ for 50 min. Then add 4 g of tetraethyl orthosilicate, 0.8 g of lanthanum chloride, 70 g of methyl triethoxysilane, 20 mL of ethanol, and 20 mL of deionized water. React at 70℃ for 50 min to obtain polysilsesquioxane sol B.

[0049] Step four: preparation of high-strength rare earth weathering steel:

[0050] Spray polysilsesquioxane sol B on the surface of the rare earth weathering steel, with a spraying thickness of 3 μm. Dry at 25℃ for 1 h. Then spray polysilsesquioxane sol A on the surface of the polysilsesquioxane sol B, with a spraying thickness of 3 μm. Dry at 25℃ in a horizontal magnetic field for 1 h, with a magnetic field strength of 0.5 T. Obtain high-strength rare earth weathering steel.

[0051] Example 3: a preparation process of high-strength rare earth weathering steel, comprising the following steps:

[0052] Step one: preparation of rare earth weathering steel:

[0053] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, and cerium, and smelt and cast to obtain a steel ingot. Heat to 1220℃ for 4 h, and then roll, cool, and clean to obtain rare earth weathering steel.

[0054] The rare earth weathering steel is composed of the following components: 0.25wt% silicon, 0.06wt% carbon, 1.0wt% manganese, 0.60wt% chromium, 0.55wt% copper, 0.35wt% nickel, 0.0012wt% calcium, 0.016wt% titanium, 0.012wt% phosphorus, 0.002wt% sulfur, 0.006wt% lanthanum, and 0.005wt% cerium, in terms of mass fraction.

[0055] Step two: preparation of nickel-plated carbon nanotubes:

[0056] Take 5g carbon nanotubes, 150mL of concentrated nitric acid solution, and oscillate at 80℃ for 9h. Add 150mL of deionized water, and filter, wash, and dry until the carbon nanotubes are neutral. Dry to obtain acidified carbon nanotubes. Take 0.1g of acidified carbon nanotubes, add 100mL of deionized water, and ultrasonically disperse. Add 1g of stannous chloride dihydrate sensitizer and 4g of hydrochloric acid, and oscillate for 20min. Filter, wash, and dry. Add 100mL of deionized water, ultrasonically disperse, add 0.04g of palladium dichloride, and 1g of hydrochloric acid. Oscillate for 20min, filter, wash, and dry to obtain treated carbon nanotubes. Add the treated carbon nanotubes to a nickel plating solution, react at 35℃ for 30min, remove, wash, and dry to obtain nickel-plated carbon nanotubes.

[0057] The nickel plating solution includes the following components: 0.2mol / L nickel chloride hexahydrate, 0.1mol / L nickel sulfate hexahydrate, 1.6mol / L ammonium chloride, 0.1mol / L sodium citrate, 0.6mol / L sodium hypophosphite, 0.004mol / L lead nitrate, and 0.005mol / L phytic acid, with deionized water as the solvent.

[0058] Step three:

[0059] Preparation of polysilsesquioxane sol A:

[0060] Take 0.2g of nickel-plated carbon nanotubes, 0.9g of glycidyl ether oxypropyltrimethoxysilane, and 40mL of ethanol. Heat to 75℃ and react for 70min. Then add 4g of tetraethyl orthosilicate, 0.8g of lanthanum chloride, 70g of methyltriethoxysilane, 20mL of ethanol, and 20mL of deionized water. React at 75℃ for 70min to obtain polysilsesquioxane sol A.

[0061] Preparation of polysilsesquioxane sol B:

[0062] Take 0.2 g carbon nanotube, 0.9 g glycidyl ether propyl trimethoxysilane, 40 mL ethanol, heated to 75℃, reaction for 70 min, then drop 4 g of ethyl silicate, 0.8 g of lanthanum chloride, 70 g of methyl triethoxysilane, 20 mL of ethanol, 20 mL of deionized water mixture, at 75℃, reaction for 70 min, to get polysilicic acid sol B;

[0063] Step four: preparation of high strength rare earth weathering steel:

[0064] Spray polysilicic acid sol B on the surface of rare earth weathering steel, the spraying thickness is 3 μm, dry at 25℃ for 1 h, then spray polysilicic acid sol A on the surface of polysilicic acid sol B, the spraying thickness is 3 μm, dry at 25℃ in horizontal magnetic field for 1 h, the magnetic field strength is 0.5 T, to get high strength rare earth weathering steel.

[0065] Comparative example 1: no lanthanum chloride is added, the rest is the same as example 1:

[0066] Step one: preparation of rare earth weathering steel:

[0067] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, cerium, smelt, cast, get steel ingot, heated to 1210℃ for 3.5 h, rolling, cooling, cleaning, to get rare earth weathering steel;

[0068] The rare earth weathering steel is composed of the following components: 0.22wt% silicon, 0.055wt% carbon, 0.8wt% manganese, 0.58wt% chromium, 0.50wt% copper, 0.30wt% nickel, 0.0011wt% calcium, 0.015wt% titanium, 0.0011wt% phosphorus, 0.0015wt% sulfur, 0.0005wt% lanthanum, 0.0004wt% cerium;

[0069] Step two: preparation of nickel plated carbon nanotube:

[0070] Take 5 g carbon nanotube, 150 mL of concentrated nitric acid solution, oscillate at 77℃ for 8 h, add 150 mL of deionized water, filter, wash, until the carbon nanotube is neutral, dry, to get acidified carbon nanotube; take 0.1 g of acidified carbon nanotube, add 100 mL of deionized water, ultrasonic dispersion, add 1 g of stannous chloride dihydrate sensitizer, 4 g of hydrochloric acid, oscillate for 18 min; filter, wash, dry, add 100 mL of deionized water, ultrasonic dispersion, add 0.04 g of dichloropalladium, 1 g of hydrochloric acid, oscillate for 18 min, filter, wash, dry, to get treated carbon nanotube; add the treated carbon nanotube to the nickel plating solution, react at 35℃ for 30 min, take out, wash, dry, to get nickel plated carbon nanotube;

[0071] The nickel plating solution comprises the following components: 0.2 mol / L nickel chloride hexahydrate, 0.1 mol / L nickel sulfate hexahydrate, 1.6 mol / L ammonium chloride, 0.1 mol / L sodium citrate, 0.6 mol / L sodium hypophosphite, 0.004 mol / L lead nitrate, 0.005 mol / L phytic acid, and deionized water as a solvent;

[0072] Step three:

[0073] Preparation of polysilsesquioxane sol A:

[0074] Take 0.2 g of nickel-plated carbon nanotubes, 0.9 g of glycidyl ether oxypropyl trimethoxysilane, 40 mL of ethanol, and heat to 72℃ for 60 min. Then add 4 g of tetraethyl orthosilicate, 70 g of methyl triethoxysilane, 20 mL of ethanol, and 20 mL of deionized water. React at 73℃ for 60 min to obtain polysilsesquioxane sol A.

[0075] Preparation of polysilsesquioxane sol B:

[0076] Take 0.2 g of carbon nanotubes, 0.9 g of glycidyl ether oxypropyl trimethoxysilane, 40 mL of ethanol, and heat to 72℃ for 60 min. Then add 4 g of tetraethyl orthosilicate, 70 g of methyl triethoxysilane, 20 mL of ethanol, and 20 mL of deionized water. React at 72℃ for 60 min to obtain polysilsesquioxane sol B.

[0077] Step four: preparation of high-strength rare earth weathering steel:

[0078] Spray polysilsesquioxane sol B on the surface of the rare earth weathering steel with a thickness of 3 μm, dry at 25℃ for 1 h, then spray polysilsesquioxane sol A on the surface of the polysilsesquioxane sol B with a thickness of 3 μm, dry at 25℃ in a horizontal magnetic field for 1 h with a magnetic field strength of 0.5 T to obtain high-strength rare earth weathering steel.

[0079] Comparative example 2: no polysilsesquioxane sol B is coated, and the rest is the same as example 1:

[0080] Step one: preparation of rare earth weathering steel:

[0081] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, and cerium, smelt, and cast to obtain a steel ingot. Heat to 1210℃ for 3.5 h, roll, cool, and clean to obtain rare earth weathering steel.

[0082] The rare earth weathering steel consists of the following components: 0.22wt% silicon, 0.055wt% carbon, 0.8wt% manganese, 0.58wt% chromium, 0.50wt% copper, 0.30wt% nickel, 0.0011wt% calcium, 0.015wt% titanium, 0.0011wt% phosphorus, 0.0015wt% sulfur, 0.0005wt% lanthanum, 0.0004wt% cerium, in terms of mass fraction;

[0083] Step two: preparation of nickel-plated carbon nanotubes:

[0084] Take 5g carbon nanotubes, 150mL of concentrated nitric acid solution, oscillate at 77℃ for 8h, add 150mL of deionized water, filter, wash, until the carbon nanotubes are neutral, dry, to obtain acidified carbon nanotubes; take 0.1g of acidified carbon nanotubes, add 100mL of deionized water, ultrasonic dispersion, add 1g of stannous chloride dihydrate sensitizer, 4g of hydrochloric acid, oscillate for 18min; filter, wash, dry, add 100mL of deionized water, ultrasonic dispersion, add 0.04g of dichloropalladium, 1g of hydrochloric acid, oscillate for 18min, filter, wash, dry, to obtain treated carbon nanotubes; add the treated carbon nanotubes to the nickel plating solution, react at 35℃ for 30min, take out, wash, dry, to obtain nickel-plated carbon nanotubes;

[0085] The nickel plating solution includes the following components: 0.2mol / L nickel chloride hexahydrate, 0.1mol / L nickel sulfate hexahydrate, 1.6mol / L ammonium chloride, 0.1mol / L sodium citrate, 0.6mol / L sodium hypophosphite, 0.004mol / L lead nitrate, 0.005mol / L phytic acid, with deionized water as the solvent;

[0086] Step three: preparation of polysilsesquioxane sol A:

[0087] Take 0.2g of nickel-plated carbon nanotubes, 0.9g of glycidyl ether oxypropyltrimethoxysilane, 40mL of ethanol, heat to 72℃, react for 60min, then add 4g of tetraethyl orthosilicate, 0.8g of lanthanum chloride, 70g of methyltriethoxysilane, 20mL of ethanol, 20mL of deionized water, mix, react at 73℃ for 60min, to obtain polysilsesquioxane sol A;

[0088] Step four: preparation of high-strength rare earth weathering steel:

[0089] Spray polysilsesquioxane sol A on the surface of the rare earth weathering steel, with a spraying thickness of 3μm, dry at 25℃ in a horizontal magnetic field for 1h, with a magnetic field strength of 0.5T, to obtain high-strength rare earth weathering steel.

[0090] Comparative example 3: do not plate nickel on the carbon nanotubes, the rest is the same as example 1:

[0091] Step one: preparation of rare earth weathering steel:

[0092] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, cerium, smelt, cast, get steel ingot, heat to 1210 DEG C for 3.5h, rolling, cooling, cleaning, get rare earth weathering steel;

[0093] The rare earth weathering steel is composed of the following components: 0.22wt% silicon, 0.055wt% carbon, 0.8wt% manganese, 0.58wt% chromium, 0.50wt% copper, 0.30wt% nickel, 0.0011wt% calcium, 0.015wt% titanium, 0.0011wt% phosphorus, 0.0015wt% sulfur, 0.0005wt% lanthanum, 0.0004wt% cerium;

[0094] Step two: preparation of polysiloxane sol:

[0095] Take 0.2g carbon nanotube, 0.9g glycidyl ether oxypropyl trimethoxysilane, 40mL ethanol, heat to 72 DEG C, react for 60min, then drop 4g tetraethyl orthosilicate, 0.8g lanthanum chloride, 70g methyl triethoxysilane, 20mL ethanol, 20mL deionized water mixture, at 72 DEG C, react for 60min, get polysiloxane sol;

[0096] Step three: preparation of high strength rare earth weathering steel:

[0097] Spray polysiloxane sol on the surface of rare earth weathering steel, the spraying thickness is 3um, dry at 25 DEG C for 1h, spray polysiloxane sol on the surface of polysiloxane sol again, the spraying thickness is 3um, dry at 25 DEG C for 1h, get high strength rare earth weathering steel.

[0098] Comparative example 4: no phytic acid is added, and the rest is the same as example 1:

[0099] Step one: preparation of rare earth weathering steel:

[0100] Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, cerium, smelt, cast, get steel ingot, heat to 1210 DEG C for 3.5h, rolling, cooling, cleaning, get rare earth weathering steel;

[0101] The rare earth weathering steel is composed of the following components: 0.22wt% silicon, 0.055wt% carbon, 0.8wt% manganese, 0.58wt% chromium, 0.50wt% copper, 0.30wt% nickel, 0.0011wt% calcium, 0.015wt% titanium, 0.0011wt% phosphorus, 0.0015wt% sulfur, 0.0005wt% lanthanum, and 0.0004wt% cerium;

[0102] Step two: preparation of nickel-plated carbon nanotubes:

[0103] Take 5g carbon nanotubes, 150mL of concentrated nitric acid solution, and shake at 77℃ for 8h. Add 150mL of deionized water, and filter, wash, and dry until the carbon nanotubes are neutral. Dry to obtain acidified carbon nanotubes. Take 0.1g of acidified carbon nanotubes, add 100mL of deionized water, and ultrasonically disperse. Add 1g of stannous chloride dihydrate sensitizer and 4g of hydrochloric acid, and shake for 18min. Filter, wash, and dry. Add 100mL of deionized water, ultrasonically disperse, add 0.04g of palladium dichloride, and 1g of hydrochloric acid. Shake for 18min, filter, wash, and dry to obtain treated carbon nanotubes. Add the treated carbon nanotubes to a nickel plating solution, react at 35℃ for 30min, remove, wash, and dry to obtain nickel-plated carbon nanotubes;

[0104] The nickel plating solution includes the following components: 0.2mol / L nickel chloride hexahydrate, 0.1mol / L nickel sulfate hexahydrate, 1.6mol / L ammonium chloride, 0.1mol / L sodium citrate, 0.6mol / L sodium hypophosphite, and 0.004mol / L lead nitrate, with deionized water as the solvent;

[0105] Step three:

[0106] Preparation of polysilsesquioxane sol A:

[0107] Take 0.2g of nickel-plated carbon nanotubes, 0.9g of glycidyl ether oxypropyltrimethoxysilane, and 40mL of ethanol. Heat to 72℃ and react for 60min. Then add 4g of tetraethyl orthosilicate, 0.8g of lanthanum chloride, 70g of methyltriethoxysilane, 20mL of ethanol, and 20mL of deionized water. React at 73℃ for 60min to obtain polysilsesquioxane sol A;

[0108] Preparation of polysilsesquioxane sol B:

[0109] Take 0.2 g of carbon nanotubes, 0.9 g of glycidyl ether propyl trimethoxysilane, 40 mL of ethanol, and heat to 72℃, react for 60 min, then add 4 g of tetraethyl orthosilicate, 0.8 g of lanthanum chloride, 70 g of methyl triethoxysilane, 20 mL of ethanol, 20 mL of deionized water, and heat to 72℃, react for 60 min, to obtain polysilsesquioxane sol B;

[0110] Step four: preparation of high-strength rare earth weathering steel:

[0111] Spray polysilsesquioxane sol B on the surface of the rare earth weathering steel, with a spraying thickness of 3μm, dry at 25℃ for 1h, then spray polysilsesquioxane sol A on the surface of the polysilsesquioxane sol B, with a spraying thickness of 3μm, dry at 25℃ in a horizontal magnetic field for 1h, with a magnetic field strength of 0.5T, to obtain high-strength rare earth weathering steel.

[0112] Experiment:

[0113] Take the high-strength rare earth weathering steel prepared in Examples 1 to 3 and Comparative Examples 1 to 4, and test its performance. Prepare a 10mm × l0mm × 55mm sample of the high-strength rare earth weathering steel and test its tensile strength. Test the acid and alkali resistance of the high-strength rare earth weathering steel by immersing the sample in 5% HCl and 9.5% NaOH until the coating surface bubbles, and record the acid and alkali resistance time. The data obtained are as follows:

[0114] Tensile strength / Mpa Acid resistance / h Alkali resistance / h Example 1 826 662 487 Example 2 823 660 483 Example 3 827 663 489 Comparative Example 1 822 637 451 Comparative Example 2 820 621 445 Comparative Example 3 817 618 436 Comparative Example 4 821 628 440

[0115] Conclusion: From the data comparison, the comparative example 1 does not add rare earth salt lanthanum chloride, the compactness of the coating is poor, and the corrosion resistance of the rare earth weathering steel is reduced. The comparative example 2 does not coat the polysiloxane sol B, and the corrosion resistance of the rare earth weathering steel is reduced. The comparative example 3 does not plate nickel on the carbon nanotube, the carbon nanotube is easy to agglomerate, the corrosion medium is easy to invade, and the corrosion resistance of the coating is reduced. The comparative example 4 does not add phytic acid in the nickel plating solution, and the corrosion resistance of the carbon nanotube is reduced. The polysiloxane sol A and the polysiloxane sol B are prepared in the example 1 to the example 3, the compactness of the coating is enhanced by adding the rare earth salt lanthanum chloride, so that the corrosion resistance and the weather resistance of the rare earth weathering steel are improved. The polysiloxane sol A and the polysiloxane sol B are compounded, so that the corrosion resistant coating on the surface of the weathering steel is more compact, and the corrosion resistance of the weathering steel is improved. The nickel plated carbon nanotube is added in the polysiloxane sol A, a layer of nickel is plated on the carbon nanotube by using the nickel plating solution, the nickel is a ferromagnetic metal, a dense oxide protective layer is formed on the surface of the carbon nanotube by plating a layer of nickel on the carbon nanotube, the invasion of the corrosion medium is hindered, and the corrosion resistance of the coating is improved. The phytic acid is added in the nickel plating solution in the example 1 to the example 3, and the corrosion resistance of the carbon nanotube is further enhanced by adding the phytic acid. The carbon nanotube has magnetism by plating a layer of nickel on the carbon nanotube, and the carbon nanotube can be better dispersed under the action of the magnetic field, so that the corrosion resistance of the rare earth weathering steel is improved.

[0116] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other embodiments without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A preparation process for high-strength rare earth weathering steel, characterized in that: Includes the following steps: Step 1: Take silicon, carbon, manganese, chromium, copper, nickel, calcium, titanium, phosphorus, sulfur, lanthanum, cerium and iron, smelt and cast to obtain steel ingots, heat to 1200-1220℃ and hold for 3-4 hours, roll, cool and clean to obtain rare earth weathering steel. Step 2: Take nickel-plated carbon nanotubes, glycidyl etheroxypropyltrimethoxysilane, and ethanol, heat to 70-75℃, react for 50-70 min, then add a mixture of tetraethyl orthosilicate, lanthanum chloride, methyltriethoxysilane, ethanol, and deionized water, and react at 70-75℃ for 50-70 min to obtain polysilsesquioxane sol A; Take carbon nanotubes, glycidyl etheroxypropyltrimethoxysilane, and ethanol, heat to 70-75℃, react for 50-70 min, then add a mixture of tetraethyl orthosilicate, lanthanum chloride, methyltriethoxysilane, ethanol, and deionized water, and react at 70-75℃ for 50-70 min to obtain polysilsesquioxane sol B. Step 3: Spray polysilsesquioxane sol B onto the surface of rare earth weathering steel, dry it, then spray polysilsesquioxane sol A onto the surface of polysilsesquioxane sol B, dry it, and obtain high-strength rare earth weathering steel. The preparation method of the nickel-plated carbon nanotubes is as follows: the treated carbon nanotubes are added to the nickel plating solution, reacted at 35-40℃ for 30-40 min, taken out, washed and dried to obtain nickel-plated carbon nanotubes. The nickel plating solution comprises the following components: nickel chloride hexahydrate, nickel sulfate hexahydrate, ammonium chloride, sodium citrate, sodium hypophosphite, lead nitrate, and phytic acid, with deionized water as the solvent; The rare earth weathering steel is composed of the following components by mass fraction: 0.20wt%-0.25wt% silicon, 0.05wt%-0.06wt% carbon, 0.55wt%-1.0wt% manganese, 0.55wt%-0.60wt% chromium, 0.45wt%-0.55wt% copper, 0.25wt%-0.35wt% nickel, 0.0011wt%-0.0012wt% calcium, 0.013wt%-0.016wt% titanium, 0.001wt%-0.012wt% phosphorus, 0.001wt%-0.002wt% sulfur, 0.0004wt%-0.006wt% lanthanum, 0.0003wt%-0.005wt% cerium, with the balance being iron.

2. The preparation process of high-strength rare earth weathering steel according to claim 1, characterized in that: When the polysilsesquioxane sol A is dried, it is placed in a horizontal magnetic field with a magnetic field strength of 0.5T-0.6T.

3. The preparation process of high-strength rare earth weathering steel according to claim 1, characterized in that: The preparation method of the treated carbon nanotubes is as follows: take carbon nanotubes and concentrated nitric acid solution, shake at 75-80℃ for 7-9h, add deionized water, filter and wash until the carbon nanotubes are neutral, dry to obtain acidified carbon nanotubes; take the acidified carbon nanotubes, add deionized water, ultrasonically disperse, add stannous chloride dihydrate sensitizer and hydrochloric acid, shake for 15-20min; After filtration, washing, and drying, add 100 mL of deionized water, sonicate to disperse, add palladium dichloride and hydrochloric acid, shake for 15-20 min, filter, wash, and dry to obtain the treated carbon nanotubes.

4. The preparation process of high-strength rare earth weathering steel according to claim 2, characterized in that: The magnetic field strength is 0.5T.

5. High-strength rare earth weathering steel prepared by the preparation process of high-strength rare earth weathering steel according to any one of claims 1-4.