Surface rust layer stabilizer for weather-resistant steel in plateau and rust layer stabilizing treatment method

Abstract

The invention relates to a weather-resistant steel surface rust layer stabilizer for a plateau and a rust layer stabilizing treatment method. The rust layer stabilizer is prepared from the following components in parts by mass: 5 parts of a film-forming agent, 4 parts of an accelerant, 1 part of an inducer, 3 parts of a complexing agent, 2-5 parts of an ultraviolet light absorber, 2-5 parts of an anti-ultraviolet agent, 5 parts of an anti-corrosion slow-release agent, 3-5 parts of a self-repairing polymer and the balance of a solvent, wherein the total amount is 100 parts by mass. The rust layer stabilizer adapts to the plateau complex environment, and can effectively cope with extreme weather conditions such as strong ultraviolet rays, large day and night temperature difference and thin air in the plateau complex environment by using the components such as the ultraviolet light absorber, the anti-ultraviolet agent and the self-repairing polymer; and the protection performance of the weathering steel in environments with high ultraviolet rays, large day and night temperature difference and the like is enhanced, a long-term protection effect is provided, and the stability of the steel surface is kept. The rust layer stabilizing treatment method is easy and convenient to operate and suitable for construction and maintenance of a large-area steel structure.

Description

Technical Field

[0001] The invention relates to the technical field of metal corrosion and protection, and in particular to a rust layer stabilizer and a rust layer stabilization treatment method for the surface of weathering steel used in plateaus. Background Art

[0002] Weathering steel can form a stable rust layer in the natural environment, thus protecting the internal steel from further corrosion. Maintaining the stability of this rust layer is essential to ensure the long-term performance of weathering steel. In plateau environments, due to the particularity of climatic conditions, such as high altitude, strong ultraviolet radiation, large temperature difference between day and night, and low oxygen content, traditional rust prevention technologies may face greater challenges. The characteristics of plateau climate will accelerate the corrosion of metal materials, especially materials such as steel that are prone to rust formation. Some existing rust stabilization treatment methods specifically require that they be carried out before or after construction, which is not conducive to the development of treatment; some existing rust stabilization treatments have poor rust layer density and low corrosion resistance.

[0003] Therefore, inventing a rust layer stabilizer suitable for plateau environments and a rust layer stabilization treatment method that does not require subsequent maintenance is an urgent problem to be solved in the field. Summary of the invention

[0004] In view of the deficiencies in the prior art, the main purpose of the present invention is to provide a rust layer stabilizer and a rust layer stabilization treatment method for the surface of weathering steel for plateau use, so as to solve the above problems.

[0005] The technical solution of the present invention is as follows:

[0006] The first aspect of the present invention provides a weathering steel surface rust layer stabilizer for plateau use, which comprises the following components based on a total amount of 100 parts by mass:

[0007] 5 parts of film former;

[0008] 4 parts of accelerator;

[0009] 1 part of inducer;

[0010] 3 parts of complexing agent;

[0011] 2 to 5 parts of ultraviolet absorber;

[0012] 2 to 5 parts of anti-ultraviolet agent;

[0013] 5 parts of anti-corrosion slow-release agent;

[0014] 3-5 parts of self-healing polymer;

[0015] The balance is solvent.

[0016] In some achievable embodiments, the film former is a water-based acrylic resin.

[0017] In some feasible embodiments, the promoter is CuSO4 or FeSO4, each with a mass fraction of 2 parts.

[0018] In some achievable embodiments, the inducing agent is Fe3O4.

[0019] In some achievable embodiments, the complexing agent is disodium ethylenediaminetetraacetate.

[0020] In some achievable embodiments, the ultraviolet absorber is 2-hydroxy-4-octyloxybenzophenone.

[0021] In some achievable embodiments, the UV-resistant agent is polysiloxane.

[0022] In some feasible embodiments, the anti-corrosion sustained-release agent is zinc phosphate microcapsules.

[0023] In some achievable embodiments, the self-healing polymer is polyurethane microcapsules.

[0024] In some achievable embodiments, the solvent is water.

[0025] In some achievable embodiments, the zinc phosphate microcapsules are prepared as follows:

[0026] 100 parts by weight of zinc phosphate powder and 20-30 parts by weight of microcapsule powder are mixed, and the mixture is uniformly mixed under magnetic stirring to obtain zinc phosphate microcapsules.

[0027] In some achievable embodiments, the polyurethane microcapsules are prepared as follows:

[0028] 100 parts by mass of polyurethane powder and 5 to 15 parts by mass of microcapsule powder are mixed, and the mixture is evenly mixed under magnetic stirring to obtain polyurethane microcapsules.

[0029] In some feasible embodiments, the microcapsule powder is prepared as follows:

[0030] (1) Preparation of aqueous phase: adding polyvinyl alcohol and gum arabic to deionized water, heating and stirring, to obtain an aqueous phase solution; wherein the concentration of polyvinyl alcohol is 0.004 g / mL, and the concentration of gum arabic is 0.01 g / mL;

[0031] (2) Preparation of oil phase: adding sorbitan monooleate, trioctyl phosphate and di-tert-butyl-p-cresol into liquid paraffin, stirring and mixing to form a uniform oil phase solution; wherein the concentration of sorbitan monooleate is 1 mol / L, the concentration of trioctyl phosphate is 0.5 mol / L, and the concentration of di-tert-butyl-p-cresol is 1 mol / L;

[0032] (3) Mixing and emulsification: 50 mL of the oil phase solution was slowly dripped into 50 mL of the aqueous phase solution under stirring to form an O / W emulsion to form a discontinuous phase; the pH in the emulsion system was adjusted to enhance the cross-linking effect, and then 2 g of glutaraldehyde was dripped, and the temperature was raised to 50 ° C and kept warm for 2 h;

[0033] (4) Post-treatment of microcapsules: The solution after the reaction is allowed to stand at room temperature until the microcapsules settle. The upper layer of liquid is removed by pouring out and deionized water is added. The mixture is shaken and allowed to stand. The operation is repeated 4 to 5 times until the upper layer of liquid is no longer turbid. The mixture is then filtered and the obtained sample is placed at room temperature to dry naturally for 6 hours. After drying, microcapsule powder is obtained.

[0034] The second aspect of the present invention provides a method for stabilizing the rust layer on the surface of weathering steel for plateau use, using the rust layer stabilizer described in the first aspect of the present invention.

[0035] In some practicable embodiments, the rust layer stabilization treatment method comprises the following steps:

[0036] S10: Pre-treatment of the surface of the weathering steel specimens at the Pingyuan plant;

[0037] S20: Apply rust stabilizer on the surface of pretreated weathering steel specimens;

[0038] S30: Transport the weathering steel specimens coated with rust stabilizer to the plateau construction site and install them in place;

[0039] S40: Under natural climatic conditions, a rust layer gradually forms on the surface of the weathering steel specimen. The rust layer stabilizer stabilizes the rust layer, promoting its stabilization and uniform growth, without the need for subsequent maintenance.

[0040] In some feasible embodiments, the pretreatment is to perform preliminary cleaning on the surface of the weathering steel specimen, remove the oxide scale on the surface of the weathering steel specimen and perform grinding.

[0041] In some achievable embodiments, the method of applying the rust layer stabilizer includes one or more of the following:

[0042] Spraying method: On the Pingyuan factory production line, an air spray gun is used to atomize the rust stabilizer and spray it onto the surface of the weathering steel specimen;

[0043] Electrostatic spraying treatment method: On the production line of Pingyuan Factory, electrostatic spraying equipment is used to adsorb the rust stabilizer onto the surface of the weathering steel specimen with the help of an electric field;

[0044] Immersion treatment method: On the Pingyuan factory production line, the weathering steel specimen is completely immersed in a liquid tank containing a rust layer stabilizer so that the rust layer stabilizer evenly covers the surface of the weathering steel specimen.

[0045] In some achievable embodiments, the step of using an air spray gun to atomize the rust layer stabilizer and spraying it onto the surface of the weathering steel specimen specifically includes:

[0046] Pour the prepared rust stabilizer into the air spray gun;

[0047] First, use an air spray gun to evenly spray the rust stabilizer on the surface of the weathering steel specimen to ensure that the rust stabilizer can completely cover the steel surface. Then let the surface of the weathering steel specimen dry naturally, and finally spray the surface of the weathering steel with pure water.

[0048] The treated weathering steel specimens were placed in a constant temperature chamber at 40-50°C, with natural oxygen supply;

[0049] Take the weathering steel specimens out of the constant temperature chamber every hour, spray the rust stabilizer evenly on the surface of the specimens, wait for them to dry naturally, spray the surface of the weathering steel with pure water and send them into the constant temperature chamber;

[0050] After 12 hours, the weathering steel specimens were taken out of the constant temperature chamber and naturally cooled to room temperature.

[0051] In some achievable embodiments, the step of using an electrostatic spraying device to adsorb the rust stabilizer onto the surface of the weathering steel specimen by means of an electric field specifically includes:

[0052] Pour the prepared rust layer stabilizer into the electrostatic spraying equipment;

[0053] Send the pretreated weathering steel specimens into the electric field chamber, adjust the electric field strength of the electrostatic spraying equipment, make the rust layer stabilizer evenly charged, and ensure that the rust layer stabilizer can adhere to the steel surface under the action of the electric field;

[0054] In the electric field chamber, the charged rust stabilizer is first released through the electrostatic spraying equipment, so that the rust stabilizer particles are evenly attached to the surface of the weathering steel specimen under the action of the electric field, and then the surface of the weathering steel specimen is allowed to dry naturally;

[0055] Repeat the above process every 2 hours;

[0056] Take out the weathering steel specimen from the electric field chamber.

[0057] In some achievable embodiments, the step of completely immersing the weathering steel specimen in a liquid tank containing a rust layer stabilizer so that the rust layer stabilizer uniformly covers the surface of the weathering steel specimen specifically includes:

[0058] Pour the prepared rust layer stabilizer into the liquid tank;

[0059] Immerse the pretreated weathering steel specimen in the rust stabilizer in the liquid tank and keep it for 1 to 2 hours to ensure that the rust stabilizer is completely soaked and evenly adhered to the steel surface;

[0060] Take out the weathering steel specimens after immersion and allow them to air dry naturally to ensure that the coating is evenly dried and firmly adheres to the surface of the weathering steel specimens.

[0061] The beneficial effects of the present invention relative to the prior art are:

[0062] (1) Adapting to the complex environment of the plateau: Rust layer stabilizers use UV absorbers, UV inhibitors, corrosion inhibitors and self-healing polymers to effectively cope with extreme climatic conditions such as strong ultraviolet rays, large temperature differences between day and night, and thin air in the complex environment of the plateau.

[0063] (2) Provide long-term protection and simplify subsequent maintenance: The combination of anti-corrosion slow-release agent and chelating agent can not only gradually release anti-corrosion components during the formation of the rust layer to provide long-term protection, but also effectively inhibit the continued growth of the rust layer and maintain the stability of the steel surface.

[0064] (3) Through self-healing polymer technology, the coating automatically repairs microcracks when damaged, ensuring the long-term use of steel in harsh environments.

[0065] (4) Zinc phosphate microcapsules and polyurethane microcapsules use microcapsule technology (a technology for preparing zinc phosphate microcapsules or polyurethane microcapsules by mixing zinc phosphate powder or polyurethane powder with microcapsule powder). Through microcapsule technology, the anti-corrosion ingredients can be slowly released, ensuring that weathering steel can still receive effective anti-corrosion protection when exposed to the harsh environment of the plateau for a long time, thereby extending the service life of the weathering steel.

[0066] (5) Easy to operate, suitable for large-scale construction: In plain factories, spraying, electrostatic spraying or immersion treatment are used to complete the coating of rust layer stabilizer. Compared with on-site construction in plateaus, the uniformity and adhesion of rust layer stabilizer on the surface of weathering steel specimens are enhanced.

[0067] (6) The surface pretreatment of weathering steel completed in the plain factory simplifies the operation on the plateau site and is suitable for the construction and maintenance of large-scale steel structures.

[0068] It should be understood that the contents described in the Summary of the Invention section are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easy to understand through the following description. In addition, the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0070] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0071] Figure 1 This is a schematic diagram of the mechanism of action of the rust layer stabilizer on the surface of weathering steel used in plateaus according to the present invention;

[0072] Figure 2 The figure is a schematic flow chart of the method for stabilizing the rust layer on the surface of weathering steel used in plateaus according to the present invention;

[0073] Figure 3a It is a schematic diagram of the stabilization treatment of the Q500qENH weathering steel specimens of the experimental group (before the specimens are coated with a rust layer stabilizer) for feasibility verification based on Application Example 1 of the present invention;

[0074] Figure 3b It is a schematic diagram of the stabilization treatment of the Q500qENH weathering steel specimens of the experimental group for feasibility verification based on Application Example 1 of the present invention (the specimens were stabilized for 30 minutes);

[0075] Figure 3c It is a schematic diagram of the stabilization treatment of the Q500qENH weathering steel specimens of the experimental group for feasibility verification based on Application Example 1 of the present invention (the specimens were stabilized for 24 hours);

[0076] Figure 4a This is a schematic diagram of the relationship between the corrosion weight loss rate and the corrosion time of the experimental group and the control group after the periodic infiltration test for feasibility verification based on Application Example 1 of the present invention;

[0077] Figure 4b This is a schematic diagram of the relationship between the adsorption mass per unit area and the adsorption time of the experimental group and the control group after the periodic infiltration test for feasibility verification based on Application Example 1 of the present invention;

[0078] Figure 4c This is a schematic diagram of the relationship between the desorption mass per unit area and the adsorption time of the experimental group and the control group after the periodic infiltration test for feasibility verification based on Application Example 1 of the present invention. DETAILED DESCRIPTION

[0079] The present invention is further described in detail below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0080] Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all methods known to those skilled in the art.

[0081] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0082] The present invention provides a weathering steel surface rust layer stabilizer for plateaus. The weathering steel surface rust layer stabilizer is applicable to complex plateau environments and special climatic conditions such as drought and water shortage, thin air, large temperature difference between day and night, and strong ultraviolet rays.

[0083] It is easy to understand that the plateau areas mentioned in the present invention are pointed out in the national standard "Technical Code for Plateau Construction" (GB / T50824-2013) that plateau areas are usually 1,500 meters or above above sea level, and put forward requirements for construction materials and human adaptability.

[0084] The weathering steel surface rust layer stabilizer comprises the following components, based on a total amount of 100 parts by weight: 5 parts of a film former, 4 parts of an accelerator, 1 part of an inducer, 3 parts of a complexing agent, 2 to 5 parts of an ultraviolet absorber, 2 to 5 parts of an anti-ultraviolet agent, 5 parts of an anti-corrosion slow-release agent, 3 to 5 parts of a self-repairing polymer, and the remainder of a solvent.

[0085] In a specific embodiment, the specific components and mass fractions of the weathering steel surface rust layer stabilizer are shown in Table 1. The specific component of the film-forming agent is water-based acrylic resin, and the mass fraction of the water-based acrylic resin is 5; the specific components of the accelerator are CuSO4 and FeSO4, wherein the mass fraction of CuSO4 is 2 and the mass fraction of FeSO4 is also 2; the specific component of the inducer is Fe3O4, and the mass fraction of Fe3O4 is 1; the specific component of the complexing agent is disodium ethylenediaminetetraacetate, and the mass fraction of the disodium ethylenediaminetetraacetate is 3; the specific component of the ultraviolet absorber is 2-hydroxy-4-octyloxybenzophenone, and the mass fraction of the 2-hydroxy-4-octyloxybenzophenone is 2; the specific component of the anti-ultraviolet agent is polysiloxane, and the mass fraction of the polysiloxane is 5; the specific component of the anti-corrosion sustained-release agent is zinc phosphate microcapsule, and the mass fraction of the zinc phosphate microcapsule is 5; the specific component of the self-repairing polymer is polyurethane microcapsule, and the mass fraction of the polyurethane microcapsule is 3; the specific component of the solvent is water, and the mass fraction of water is 72.

[0086] Table 1 Specific composition and mass fraction of weathering steel surface rust stabilizer

[0087]

[0088] See also Figure 1 The weathering steel surface rust stabilizer works in two environments, one is pretreatment and coating in a plain factory environment, and the other is installation and use in a harsh plateau environment. It is easy to understand that the present invention emphasizes that the use environment is a harsh plateau environment, which has the characteristics of low oxygen, large temperature difference, etc. Limiting pretreatment and coating in plain factories can avoid poor rust growth in a plateau environment.

[0089] Specifically, the film former, accelerator, inducer, complexing agent and solvent in the weathering steel surface rust stabilizer mainly promote the stabilization of the rust layer in the plain factory environment. The UV absorber, UV inhibitor, anti-corrosion slow-release agent and self-repairing polymer in the weathering steel surface rust stabilizer mainly protect the rust layer in the harsh environment of the plateau.

[0090] Furthermore, the principle of promoting rust stabilization of the rust layer stabilizer on the surface of weathering steel in the Pingyuan factory is: the film-forming agent improves the leveling properties of the rust layer stabilizer, helping to form a uniform and continuous protective film on the surface of the weathering steel; the promoter and inducer help the weathering steel surface to oxidize and generate a stable rust layer; the chelating agent effectively chelates iron ions to prevent further oxidation of the weathering steel to generate new rust substances, while maintaining the structural stability of the rust layer; the solvent helps to dilute the formula and control the viscosity.

[0091] Furthermore, the principle of protecting the rust layer of the rust layer stabilizer on the surface of weathering steel under the complex environment of the plateau is as follows: the UV absorber is used to absorb ultraviolet rays to prevent the rust layer on the surface of the weathering steel from deteriorating due to the damage of strong ultraviolet rays on the plateau; the anti-UV agent provides excellent UV resistance and weather resistance for the stable rust layer on the surface of weathering steel, and has good high and low temperature resistance to adapt to the extreme temperature difference changes on the plateau; the anti-corrosion slow-release agent is used to slowly release anti-corrosion ingredients, and when the rust layer is exposed to the harsh environment of the plateau, the anti-corrosion ingredients are gradually released to provide long-term protection; the self-healing polymer capsule ruptures when the coating is damaged, releasing the internal repair agent, which can repair microcracks and prevent further damage to the rust layer.

[0092] In some embodiments, the preparation process of the weathering steel surface rust stabilizer includes:

[0093] 1) Preparation of microcapsule powder:

[0094] (1) Preparation of aqueous phase: Add 2 g of polyvinyl alcohol (PVA) and 5 g of gum arabic to 500 mL of deionized water and stir evenly. Transfer the mixture to a three-necked flask, place it on an electric heating stirrer and heat it to 80°C. Maintain constant temperature stirring for 30 minutes until it is completely dissolved to obtain a transparent aqueous phase solution.

[0095] (2) Preparation of oil phase: Weigh 10 g of sorbitan monooleate (Span-80), 5 g of trioctyl phosphate and 10 g of di-tert-butyl-p-cresol (BHT) and add them to 200 mL of liquid paraffin. Transfer the mixture to a single-necked flask and stir in a 50°C constant temperature water bath for 20 minutes until a uniform and transparent oil phase solution is formed.

[0096] (3) Mixing and emulsification: Place 50 mL of the aqueous phase solution in a three-necked flask and start stirring (stirring speed 600 rpm). Use a dropping funnel to slowly add 50 mL of the oil phase solution (at a speed of about 1 mL / min) while stirring. After the addition is completed, continue stirring for 10 minutes to form a uniform oil-in-water (O / W) emulsion.

[0097] (4) Post-treatment: The emulsion after the reaction is completed is allowed to stand until the microcapsules are settled. After the supernatant is removed, 1000 mL of deionized water is added and the mixture is shaken and mixed. The washing is repeated 4 to 5 times until the upper liquid is clear. The washed microcapsules are filtered and the obtained sample is placed at room temperature to dry naturally for 6 hours. After drying, microcapsule powder is obtained.

[0098] 2) Preparation of zinc phosphate microcapsules:

[0099] 100 parts by weight of zinc phosphate powder and 20-30 parts by weight of microcapsule powder are mixed, and the mixture is uniformly mixed under magnetic stirring to obtain zinc phosphate microcapsules.

[0100] 3) Preparation of polyurethane microcapsules:

[0101] 100 parts by mass of polyurethane powder and 5 to 15 parts by mass of microcapsule powder are mixed, and the mixture is evenly mixed under magnetic stirring to obtain polyurethane microcapsules.

[0102] 4) Take 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 2-5 parts of ultraviolet absorber, 2-5 parts of anti-ultraviolet agent, 5 parts of anti-corrosion slow-release agent, 3-5 parts of self-healing polymer, and the rest as solvent, mix them evenly under magnetic stirring to obtain a weathering steel surface rust layer stabilizer.

[0103] The present invention prepares the rust layer stabilizer shown in the following embodiments:

[0104] Embodiment 1

[0105] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 2 parts of ultraviolet absorber, 2 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 3 parts of self-healing polymer and the balance of solvent.

[0106] Embodiment 2

[0107] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 2 parts of ultraviolet absorber, 3 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 3 parts of self-healing polymer and the balance of solvent.

[0108] Embodiment 3

[0109] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 3 parts of ultraviolet absorber, 3 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 4 parts of self-healing polymer and the balance of solvent.

[0110] Embodiment 4

[0111] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 4 parts of ultraviolet absorber, 2 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 4 parts of self-healing polymer and the balance of solvent.

[0112] Embodiment 5

[0113] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 5 parts of ultraviolet absorber, 4 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 3 parts of self-healing polymer and the balance of solvent.

[0114] Embodiment 6

[0115] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 4 parts of ultraviolet absorber, 4 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 5 parts of self-healing polymer and the balance of solvent.

[0116] Embodiment 7

[0117] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 5 parts of ultraviolet absorber, 5 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 3 parts of self-healing polymer and the balance of solvent.

[0118] Embodiment 8

[0119] The total amount is 100 parts by weight, including: 5 parts of film-forming agent, 4 parts of accelerator, 1 part of inducer, 3 parts of complexing agent, 5 parts of ultraviolet absorber, 2 parts of anti-ultraviolet agent, 5 parts of anti-corrosion sustained-release agent, 5 parts of self-healing polymer and the balance of solvent.

[0120] The present invention also provides a method for stabilizing the rust layer on the surface of weathering steel used in plateaus, and the method adopts the above-mentioned rust layer stabilizer.

[0121] See also Figure 2 , the method comprises the following steps:

[0122] S10: Pre-treatment of the surface of the weathering steel specimens at the Pingyuan plant;

[0123] S20: evenly apply rust stabilizer on the surface of the pretreated weathering steel specimen;

[0124] S30: Transport the weathering steel specimens coated with rust stabilizer to the plateau construction site and install them in place;

[0125] S40: Under the natural climate conditions of the plateau, a rust layer gradually forms on the surface of the weathering steel specimen. The rust layer stabilizer stabilizes the rust layer, promotes the stabilization and uniform growth of the rust layer, and no subsequent maintenance is required.

[0126] In some embodiments, the pretreatment of the surface of the weathering steel specimen is to perform preliminary cleaning on the surface of the weathering steel specimen, remove the oxide scale on the surface of the weathering steel specimen, and perform grinding.

[0127] In some embodiments, the method of applying a rust stabilizer comprises:

[0128] (1) Spraying method: On the Pingyuan factory production line, an air spray gun is used to atomize the rust stabilizer and spray it onto the surface of the weathering steel specimen.

[0129] (2) Electrostatic spraying treatment method: On the production line of the Pingyuan factory, electrostatic spraying equipment is used to adsorb the rust layer stabilizer onto the surface of the weathering steel specimen with the help of an electric field.

[0130] (3) Immersion treatment method: On the Pingyuan factory production line, the weathering steel specimen is completely immersed in a liquid tank containing a rust layer stabilizer so that the rust layer stabilizer evenly covers the surface of the weathering steel specimen.

[0131] The present invention uses a spraying method, an electrostatic spraying method or an immersion method to complete the rust layer stabilizer coating in a plain factory, which enhances the uniformity and adhesion of the rust layer stabilizer on the surface of the weathering steel specimen compared to the plateau site construction. In addition, the surface pretreatment of the weathering steel completed in the plain factory simplifies the operation on the plateau site and is suitable for the construction and maintenance of large-area steel structures.

[0132] Application Example 1

[0133] The rust layer stabilizer spraying on the surface of weathering steel specimens was completed by spraying method.

[0134] The specific operations are as follows:

[0135] In the Pingyuan factory, the oxide scale on the surface of the weathering steel specimens was removed and polished, and the prepared weathering steel surface rust stabilizer was poured into the air spray gun;

[0136] The process of removing the oxide scale and polishing the surface of the weathering steel specimen is as follows: first use an air spray gun to evenly spray a layer of rust stabilizer on the surface of the weathering steel specimen to ensure that the stabilizer can completely cover the surface of the weathering steel specimen; after spraying once, let the surface of the weathering steel specimen dry naturally; after the surface of the weathering steel specimen is dry, spray the surface of the weathering steel specimen with pure water.

[0137] The weathering steel specimens after grinding are sent to a constant temperature room: the temperature is 40~50℃, and the oxygen supply method is natural oxygen supply;

[0138] Repeat the above process of spraying rust stabilizer - drying - spraying water every 0.5~1h;

[0139] After 12 to 24 hours of treatment, take the weathering steel specimens out of the constant temperature chamber and allow them to cool naturally to room temperature.

[0140] In this embodiment, after the above steps, a weathering steel specimen with a dense and uniform rust layer can be obtained, and there is no rust liquid dripping on the surface. The installation is completed in the harsh environment of the plateau, and no subsequent maintenance is required.

[0141] Application Example 2

[0142] The electrostatic spraying method is used to complete the spraying of rust layer stabilizer on the surface of weathering steel specimens.

[0143] The specific operations are as follows:

[0144] In the Pingyuan factory, the oxide scale on the surface of the weathering steel specimens is removed and polished, and the prepared weathering steel surface rust stabilizer is poured into the electrostatic spraying equipment;

[0145] Send the polished weathering steel specimens into the electric field chamber, adjust the electric field strength of the electrostatic spraying equipment, make the rust layer stabilizer evenly charged, and ensure that it can adhere to the surface of the weathering steel specimen under the action of the electric field;

[0146] The charged rust stabilizer is released through the electrostatic spraying equipment. Under the action of the electric field, the rust stabilizer particles are evenly attached to the surface of the weathering steel specimen, especially the corners and other areas that are difficult to spray. After spraying once, let the surface of the weathering steel specimen dry naturally;

[0147] Spray again after an interval of 2 hours, wait for the weathering steel specimen to dry naturally, and then take out the weathering steel specimen.

[0148] In this embodiment, after the above steps, a weathering steel specimen with a dense and uniform rust layer is obtained, and there is no rust liquid dripping on the surface. The installation is completed in the harsh environment of the plateau, and no subsequent maintenance is required.

[0149] Application Example 3

[0150] The rust layer stabilizer spraying on the surface of weathering steel specimens was completed by the infiltration treatment method.

[0151] The specific operations are as follows:

[0152] In the Pingyuan factory, the prepared weathering steel surface rust stabilizer is poured into the liquid tank, and the surface oxide scale of the weathering steel specimen is removed and polished;

[0153] Slowly immerse the weathering steel specimen into the stabilizer solution (rust stabilizer in the liquid tank) for 1-2 hours to ensure that the stabilizer is completely infiltrated and evenly adhered to the surface of the weathering steel specimen;

[0154] After taking out the immersed weathering steel specimens, they were naturally air-dried to ensure that the coating was evenly dried and firmly adhered to the surface of the weathering steel specimens.

[0155] In this embodiment, after the above steps, a weathering steel specimen with a dense and uniform rust layer is obtained, and there is no rust liquid dripping on the surface. The installation is completed in the harsh environment of the plateau, and no subsequent maintenance is required.

[0156] Feasibility verification based on the above application example 1:

[0157] The following uses Q500qENH weathering steel for bridges as the matrix, and prepares 26 pieces of Q500qENH weathering steel, of which 12 pieces are for the control group and 14 pieces are for the experimental group. The specific configuration of the specimens is shown in Table 2. The above-mentioned weathering steel surface rust stabilizer is configured, and the experimental group Q500qENH weathering steel is treated according to Application Example 1. The control group is Q500qENH weathering steel using the configured ordinary rust stabilizer. This ordinary rust stabilizer uses water-based acrylic resin as a film-forming agent, combined with accelerators (CuSO4, FeSO4), corrosion inhibitors (tannic acid), toners (Fe2O3), inducers (Fe3O4) and moisturizers (NaH2PO4), and the solvent is pure water. The experimental group Q500qENH weathering steel specimens before and after stabilization treatment are as follows Figure 3a , Figure 3b , Figure 3c As shown, Figure 3a Before applying rust stabilizer to the specimen, Figure 3b The specimen was stabilized for 30 minutes. Figure 3c The specimens were stabilized for 24 h.

[0158] In order to simulate the rust layer damage caused by external force in the plateau environment, the specimens in the experimental group and the control group were subjected to corrosion pretreatment. Sandpaper with a grit size of 400-600 was selected, and gentle unidirectional grinding was adopted. The sandpaper was slid back and forth in the same direction to avoid excessive damage caused by random grinding. Each sample surface was polished for 30 seconds, and the polished specimens were placed in a UV aging box, adjusted to a light intensity of 12W / m², and taken out after 12 hours.

[0159] This verification adopts the laboratory accelerated corrosion method, and the treated specimens are placed in a periodic immersion corrosion treatment box, with the working room temperature set to 45°C, the baking temperature set to 70°C, and the humidity set to 70%RH. One cycle is 60 minutes, including 12 minutes of immersion and 48 minutes of drying. This verification designs four corrosion cycles, namely no corrosion, corrosion for 9 days, corrosion for 18 days, and corrosion for 27 days. The number of specimens in each corrosion cycle is shown in Table 2.

[0160] Table 2 Number of test specimens for weather resistance test

[0161]

[0162] In this verification, the corrosion rate of the sample after the periodic immersion test is calculated using the following formula:

[0163]

[0164] Where C represents the corrosion weight loss rate, in g / (mm 2 ×h);m pr and m poThey represent the mass before and after corrosion, respectively, in g; a, b, c are the length, width, and height of the specimen, respectively, in mm; t is the corrosion time, in h.

[0165] The weight loss rate was obtained in this verification and its mean was calculated as shown in Table 3.

[0166] Table 3 Corrosion weight loss rate of specimens

[0167]

[0168] In this verification, we obtain Figure 4a The relationship between the corrosion weight loss rate and corrosion time of the experimental group and the control group shown in the figure. Figure 4b The relationship between the adsorption mass per unit area and the adsorption time of the experimental group and the control group is shown, and Figure 4c The relationship between the desorption mass per unit area and the adsorption time of the experimental group and the control group is shown.

[0169] See also Figure 4a By comparison, it was found that with the increase of corrosion time, the corrosion rate of the specimens treated with plateau rust stabilizer (experimental group) and the specimens treated with ordinary rust stabilizer (control group) reached the maximum when the corrosion time was 216h, and then gradually decreased. In the whole corrosion process, in the first 216h, the corrosion rate of Q500qENH weathering steel treated with plateau rust stabilizer was higher than that of bare steel treated with ordinary rust stabilizer, indicating that in the early stage of corrosion, plateau rust stabilizer accelerated the formation of rust layer; after 216h of corrosion, the corrosion rate of Q500qENH weathering steel treated with plateau rust stabilizer was lower than that of bare steel treated with ordinary rust stabilizer, indicating that the rust layer gradually approached a stable state.

[0170] In this verification, the rust layer density test adopts the alcohol adsorption-desorption method. There are defects in the rust layer generated after weathering steel corrosion, such as cracks and holes. The larger the defects, the easier it is to adsorb anhydrous ethanol. Therefore, the density of the rust layer can be judged by the adsorption of anhydrous ethanol. The larger the adsorption mass per unit area, the worse the density of the rust layer. Figure 4b and Figure 4c By comparison, it can be seen that the longer the corrosion time, the ethanol adsorption per unit area and the initial adsorption rate gradually decrease, while the ethanol desorption per unit area and the initial desorption rate also gradually decrease. This shows that the more severe the corrosion, the fewer defects in the generated rust layer and the better the density. Under the same corrosion time, compared with the specimens treated with ordinary rust stabilizer in the control group, the ethanol adsorption and desorption per unit area of ​​the specimens treated with plateau rust stabilizer in the experimental group are both reduced. This finding shows that the stabilization treatment using plateau rust stabilizer is conducive to the formation of a dense rust layer.

[0171] In summary, the present invention uses microcapsule technology to slowly release anti-corrosion ingredients, ensuring that weathering steel can still receive effective anti-corrosion protection when exposed to the harsh environment of the plateau for a long time, thereby extending the service life of the weathering steel.

[0172] Although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present invention. Certain features described in the context of separate embodiments may also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

[0173] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A rust layer stabilizer for weathering steel surface used in plateau, characterized in that: The total amount is 100 parts by weight, including the following components: 5 parts of film former; 4 parts of accelerator; 1 part of inducer; 3 parts of complexing agent; 2 to 5 parts of ultraviolet absorber; 2 to 5 parts of anti-ultraviolet agent; 5 parts of anti-corrosion slow-release agent; 3-5 parts of self-healing polymer; The balance is solvent.

2. The rust layer stabilizer according to claim 1, characterized in that: The film-forming agent is a water-based acrylic resin; And / or, the promoter is CuSO4 and FeSO4, each having a mass fraction of 2 parts; And / or, the inducing agent is Fe3O4; And / or, the complexing agent is disodium ethylenediaminetetraacetate; And / or, the ultraviolet absorber is 2-hydroxy-4-octyloxybenzophenone; And / or, the anti-ultraviolet agent is polysiloxane; And / or, the anti-corrosion slow-release agent is zinc phosphate microcapsules; And / or, the self-healing polymer is a polyurethane microcapsule; And / or, the solvent is water.

3. The rust layer stabilizer according to claim 2, characterized in that: The zinc phosphate microcapsules are prepared as follows: 100 parts by weight of zinc phosphate powder and 20-30 parts by weight of microcapsule powder are mixed, and the mixture is uniformly mixed under magnetic stirring to obtain zinc phosphate microcapsules.

4. The rust layer stabilizer according to claim 2, characterized in that: The polyurethane microcapsules are prepared as follows: 100 parts by mass of polyurethane powder and 5 to 15 parts by mass of microcapsule powder are mixed, and the mixture is evenly mixed under magnetic stirring to obtain polyurethane microcapsules.

5. The rust layer stabilizer according to claim 3 or 4, characterized in that: The microcapsule powder is prepared as follows: (1) Preparation of aqueous phase: adding polyvinyl alcohol and gum arabic to deionized water, heating and stirring, to obtain an aqueous phase solution; wherein the concentration of polyvinyl alcohol is 0.004 g / mL, and the concentration of gum arabic is 0.01 g / mL; (2) Preparation of oil phase: adding sorbitan monooleate, trioctyl phosphate and di-tert-butyl-p-cresol into liquid paraffin, stirring and mixing to form a uniform oil phase solution; wherein the concentration of sorbitan monooleate is 1 mol / L, the concentration of trioctyl phosphate is 0.5 mol / L, and the concentration of di-tert-butyl-p-cresol is 1 mol / L; (3) Mixing and emulsification: 50 mL of the oil phase solution was slowly dripped into 50 mL of the aqueous phase solution under stirring to form an O / W emulsion to form a discontinuous phase; the pH in the emulsion system was adjusted to enhance the cross-linking effect, and then 2 g of glutaraldehyde was dripped, and the temperature was raised to 50 ° C and kept warm for 2 h; (4) Post-treatment of microcapsules: The solution after the reaction is allowed to stand at room temperature until the microcapsules settle. The upper layer of liquid is removed by pouring out and deionized water is added. The mixture is shaken and allowed to stand. The operation is repeated 4 to 5 times until the upper layer of liquid is no longer turbid. The mixture is then filtered and the obtained sample is placed at room temperature to dry naturally for 6 hours. After drying, microcapsule powder is obtained.

6. A method for stabilizing the rust layer on the surface of weathering steel for plateau use, characterized in that: The rust layer stabilizer according to any one of claims 1 to 5 is used.

7. The rust layer stabilization treatment method according to claim 6, characterized in that: The steps include: S10: Pre-treatment of the surface of the weathering steel specimens at the Pingyuan plant; S20: Apply rust stabilizer on the surface of pretreated weathering steel specimens; S30: Transport the weathering steel specimens coated with rust stabilizer to the plateau construction site and install them in place; S40: Under natural climatic conditions, a rust layer gradually forms on the surface of the weathering steel specimen. The rust layer stabilizer stabilizes the rust layer, promoting its stabilization and uniform growth, without the need for subsequent maintenance.

8. The rust layer stabilization treatment method according to claim 7, characterized in that: The pretreatment is to perform preliminary cleaning on the surface of the weathering steel specimen, remove the oxide scale on the surface of the weathering steel specimen and perform grinding treatment.

9. The rust layer stabilization treatment method according to claim 7, characterized in that: The method of applying the rust stabilizer includes one or more of the following: Spraying method: On the Pingyuan factory production line, an air spray gun is used to atomize the rust stabilizer and spray it onto the surface of the weathering steel specimen; Electrostatic spraying treatment method: On the production line of Pingyuan Factory, electrostatic spraying equipment is used to adsorb the rust stabilizer onto the surface of the weathering steel specimen with the help of an electric field; Immersion treatment method: On the Pingyuan factory production line, the weathering steel specimen is completely immersed in a liquid tank containing a rust layer stabilizer so that the rust layer stabilizer evenly covers the surface of the weathering steel specimen.

10. The rust layer stabilization treatment method according to claim 9, characterized in that: The method of using an air spray gun to atomize the rust layer stabilizer and spray it onto the surface of the weathering steel specimen specifically includes: Pour the prepared rust stabilizer into the air spray gun; First, use an air spray gun to evenly spray the rust stabilizer on the surface of the weathering steel specimen to ensure that the rust stabilizer can completely cover the steel surface. Then let the surface of the weathering steel specimen dry naturally, and finally spray the surface of the weathering steel with pure water. The treated weathering steel specimens were placed in a constant temperature room at 40-50°C, with natural oxygen supply; Take the weathering steel specimens out of the constant temperature chamber every hour, spray the rust stabilizer evenly on the surface of the specimens, wait for them to dry naturally, spray the surface of the weathering steel with pure water and send them into the constant temperature chamber; After 12 hours, the weathering steel specimens were taken out of the constant temperature chamber and naturally cooled to room temperature; And / or, the method of using electrostatic spraying equipment to absorb the rust stabilizer onto the surface of the weathering steel specimen by means of an electric field specifically includes: Pour the prepared rust layer stabilizer into the electrostatic spraying equipment; Send the pretreated weathering steel specimens into the electric field chamber, adjust the electric field strength of the electrostatic spraying equipment, make the rust layer stabilizer evenly charged, and ensure that the rust layer stabilizer can adhere to the steel surface under the action of the electric field; In the electric field chamber, the charged rust stabilizer is first released through the electrostatic spraying equipment, so that the rust stabilizer particles are evenly attached to the surface of the weathering steel specimen under the action of the electric field, and then the surface of the weathering steel specimen is allowed to dry naturally; Repeat the above process every 2 hours; Take out the weathering steel specimen from the electric field chamber; And / or, the step of completely immersing the weathering steel specimen in a liquid tank containing a rust layer stabilizer so that the rust layer stabilizer uniformly covers the surface of the weathering steel specimen specifically includes: Pour the prepared rust layer stabilizer into the liquid tank; Immerse the pretreated weathering steel specimen in the rust stabilizer in the liquid tank and keep it for 1 to 2 hours to ensure that the rust stabilizer is completely soaked and evenly adhered to the steel surface; Take out the weathering steel specimens after immersion and allow them to air dry naturally to ensure that the coating is evenly dried and firmly adheres to the surface of the weathering steel specimens.

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