Stabilization treatment solution, treatment method and application for 690MPa weathering-resistant bridge steel members

Abstract

The present invention discloses a stabilization treatment liquid for weather-resistant bridge steel members of 690 MPa level, and the stabilization treatment liquid contains ferric chloride 3-7%, sodium hydrogen sulfite 1-2%, chromium sulfate 3-6%, potassium permanganate 1-4%, polypropylene glycol 1-2%, sodium carboxymethylcellulose 2-5%, and the remainder is deionized water, in terms of mass % contents of each component. Also provided is a method for performing stabilization treatment using this stabilization treatment liquid. The present invention can realize rust layer stabilization treatment of weather-resistant bridge steel members of 690 MPa level, and a brown rust layer with a uniform color and no flow of rust liquid is formed on the surface of the weather-resistant bridge steel members of 690 MPa level after treatment.

Description

[Technical field]

[0001] The present invention belongs to the field of corrosion protection technology, and relates to a protection technology for weather-resistant bridge steel members, and more specifically to a stabilization treatment liquid and treatment method for weather-resistant bridge steel members of 690 MPa level. [Background technology]

[0002] If weathering bridge steel is used without painting, it can greatly reduce painting costs, is favorable for environmental protection, can shorten the construction cycle, and at the same time can greatly reduce maintenance costs during bridge operation (high cost advantage throughout the entire life cycle). However, if rust layer stabilization treatment is not performed, it usually takes 3 to 10 years for the rust layer on the surface to gradually stabilize. In addition, in the case of unpainted weathering steel bridges, rust water may flow out during the process of generating a protective rust layer, affecting the aesthetics and making the steel plate thinner. For this reason, weathering bridge steel is prone to environmental pollution due to dripping and scattering of rust liquid in the early stages of exposed use, which has a significant impact on the uniformity of the color of the exterior of the weathering bridge steel. This has become a bottleneck problem that limits the popularization and application of unpainted weathering bridge steel. Therefore, in order to form a stable rust layer on the surface in a short time, it is necessary to perform rust layer stabilization treatment on the surface.

[0003] In order to meet the increasing span and strength of bridge steel structures in China, the strength level of high-strength bridge steel plates has been improved to 690MPa. However, rust layer stabilization technology for high-strength weather-resistant bridge steel members has not been formed so far. In addition, since weather-resistant bridge steel members are constructed by processing and welding weather-resistant steel plates, general weather-resistant bridge steel members are approximately cubic. Weather-resistant bridge steel members are large in size, so they are difficult to invert. Therefore, the rust layer stabilization treatment of weather-resistant bridge steel members includes the side elevation, top surface, bottom surface, etc. of the member. Since the rust layer stabilization treatment liquid flows on each part of the member, the surface rust layer of the rust-layer-stabilized weather-resistant bridge steel member has uneven color and the rust liquid flows.

[0004] In the prior art, in a patent filed by the Institute of Metals, Chinese Academy of Sciences entitled "Silane coupling agent-based rust layer stabilizing treatment agent for weathering steel surface, and its manufacturing method and use method (CN202111080510.0)," the composition of the treatment agent is 1-50% silane coupling agent, 1-10% ethanol, 0.05-0.5% hydrolysis accelerator, 0.5-10% rust layer stabilizing accelerator, and the remainder is deionized water. In the patent "Weathering steel surface rust layer stabilizing treatment agent and weathering steel surface coating treatment method (CN202010666089.0)" applied for by Shougang Group, the ingredients are film forming agent: 50-80 parts, inducer: 1-10 parts, phosphating agent: 0.2-1 part, accelerator: 1-5 parts, modifier: 1-10 parts, corrosion inhibitor: 1-10 parts, surface additive: 0.05-0.3 parts, wetting dispersant: 0.05-0.4 parts, and leveling agent: 0.05-0.4 parts. In the patent "Weathering steel surface stabilizing treatment agent and treatment method for industrial atmospheric environment (CN202110934825.0)" applied for by Lanzhou University of Technology, the raw material of the treatment agent is CuSO 4 0.8~1.2%, Cr 2 (SO 4 ) 3 2.8-3.2%, NaHSO 3 0.5~0.7%, Fe 3 O 4 The rest is deionized water. The patent "Weathering steel surface stabilization rust layer rapid generation treatment agent and its use method (CN201710068872.5)" applied for by Anshan Iron & Steel is composed of two parts, agent A and agent B, and the composition of agent A is CuSO 4 0.4%~2%, NaCl 0.1%~2.5%, FeCl 3 0.5% to 3%, HCl 0.1% to 0.5%, and the balance is water. Agent B is an aqueous solution of a moisturizer, the mass % content of which is 0.2% to 3.5%, and the balance is water. The moisturizer is NaH 2 PO 4 , Na 5 P 3 O 10 , (NaPO 3 ) 6 , C 6 H 5 Na 3 O 7 2H2 O.

[0005] The above technology is mainly described in relation to weathering steel rust layer stabilization treatment, and no stabilization treatment liquid or treatment method for 690 MPa weathering bridge steel members could be confirmed. The above patent applications all relate to surface rust layer stabilization treatment liquids and methods for weathering steel, but are not related to rust layer stabilization treatment for weathering steel members, and the above technology is not suitable for the rust layer stabilization treatment of high strength (690 MPa) weathering bridge steel of the present invention. Summary of the Invention

[0006] Therefore, the present invention provides a rust layer stabilizing treatment liquid for high-strength weathering bridge steel members of 690 MPa level in order to overcome the drawbacks of the above techniques and solve problems such as rust layer stabilization treatment of 690 MPa level weathering bridge steel members and uneven color of the surface rust layer and flow of the rust liquid. Another technical problem to be solved by the present invention is to provide a treatment method for rust layer stabilizing treatment liquid for 690 MPa level weathering bridge steel members. Another technical problem to be solved by the present invention is to provide applications of the treatment liquid. In the present invention, the 690 MPa level means that the yield strength of the steel is 690 MPa or more.

[0007] The technical solution of the present invention is a stabilization treatment liquid for weathering bridge steel members with a level of 690 MPa, The stabilization treatment liquid for the weather-resistant bridge steel member of 690 MPa level includes an erosion agent, a rust layer stabilizer, a moisturizing agent, and a thickener, the erosion agent being composed of ferric chloride and sodium hydrogen sulfite, the rust layer stabilizer being composed of chromium sulfate and potassium permanganate, the moisturizing agent being polypropylene glycol, and the thickener being sodium carboxymethylcellulose, The mass% content of each component of the stabilization treatment solution is as follows: The ferric chloride content is 3-7%. The sodium bisulfite content is 1-2%. The chromium sulfate content is 3-6%. The potassium permanganate content is 1-4%. The polypropylene glycol content is 1-2%. The content of sodium carboxymethylcellulose is 2-5%. The balance is deionized water.

[0008] The functions of the components in the stabilization treatment solution for weathering steel members of bridges having a strength of 690 MPa according to the present invention are as follows.

[0009] The treatment solution of the present invention uses ferric chloride and sodium hydrogen sulfite as corrosion agents, and utilizes the oxidizing properties of iron ions and the corrosive properties of chloride ions and hydrogen sulfite ions to corrode and rust 690 MPa level weathering steel bridge members, and convert the iron element in the members to iron oxide. Chromium sulfate and potassium permanganate are used as rust layer stabilizers, and potassium permanganate has strong oxidizing properties and promotes the conversion of lepidocrocite and akaganite in the rust layer to goethite together with chromium element, and chromium element can also replace goethite to form the final stable rust layer of 690 MPa level weathering steel bridge members. Polypropylene glycol is used as a humectant, and its low volatility properties are utilized to maintain the moisture of the treatment solution and extend the reaction time of the active reactive components in the treatment solution. Sodium carboxymethylcellulose is used as a thickening agent, and the thickening component in the treatment solution is sufficiently hydrated to form a polymeric substance, thereby reducing the fluidity of the treatment solution and lengthening the residence time of the treatment solution on the side elevation or inclined surface of the member. In the present invention, the addition of sodium carboxymethylcellulose increases the residence time by 3 to 5 times compared to when no additive is added.

[0010] The erosion agent and rust layer stabilizer components in the treatment solution of the present invention promote the formation of a stable rust layer on 690 MPa weathering steel components for bridges, and the addition of a moisturizer and thickener extends the time of electrochemical and chemical reaction with the surface of the components. The four components work together to ensure that a brown rust layer with a uniform color and no flow of rust liquid is formed on the surface of 690 MPa weathering steel components for bridges.

[0011] In one or more embodiments, the mass % content of ferric chloride in the stabilization treatment solution for 690 MPa-level weathering bridge steel components of the present invention is 3 to 7%, for example 3%, 4%, 4.5%, 5%, 6%, or 7%.

[0012] In one or more embodiments, the mass % content of sodium hydrogen sulfite in the stabilization treatment solution for weathering bridge steel components having a 690 MPa level of the present invention is 1 to 2%, for example, 1%, 1.2%, 1.5%, 1.6%, 1.9%, or 2%.

[0013] In one or more embodiments, the mass % content of chromium sulfate in the stabilization treatment solution for 690 MPa-level weathering bridge steel members of the present invention is 3 to 6%, for example 3%, 4%, 4.5%, 5%, 5.5%, or 6%.

[0014] In one or more embodiments, the mass % content of potassium permanganate in the stabilization treatment solution for 690 MPa-level weathering bridge steel components of the present invention is 1 to 4%, for example 1%, 2%, 2.5%, 3%, 3.5%, or 4%.

[0015] In one or more embodiments, the mass % content of polypropylene glycol in the stabilization treatment liquid for 690 MPa-level weathering bridge steel components of the present invention is 1 to 2%, for example 1%, 1.2%, 1.5%, 1.7%, 1.8%, or 2%.

[0016] In one or more embodiments, the mass % content of sodium carboxymethylcellulose in the stabilization treatment solution for weathering bridge steel components having a 690 MPa level of the present invention is 2 to 5%, for example, 2%, 3%, 3.5%, 3.8%, 4%, or 5%.

[0017] In one or more embodiments, the mass % content of each component in the stabilization treatment solution for 690 MPa-level weathering steel bridge components of the present invention is 4-5% ferric chloride, 1-2% sodium hydrogen sulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-2% polypropylene glycol, 2-4% sodium carboxymethylcellulose, and the remainder is deionized water.

[0018] According to the stabilization treatment liquid for weathering steel bridge components having a resistance of 690 MPa as described in the present invention, the mass % contents of each component in the stabilization treatment liquid are preferably 4-5% ferric chloride, 1-1.5% sodium hydrogen sulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-1.5% polypropylene glycol, 2-3% sodium carboxymethylcellulose, and the remainder being deionized water.

[0019] The present invention also provides a method for treating a stabilization treatment liquid for a weathering steel member for bridges having a resistance of 690 MPa or a method for treating a stabilization treatment liquid for a weathering steel member for bridges having a resistance of 690 MPa, the method comprising the steps of: (1) Prepare the stabilization treatment liquid in mass% according to the formula of the stabilization treatment liquid for weathering steel members of 690 MPa level mentioned above, and stir thoroughly at a stirring speed not exceeding 500 rpm; (2) Sandblasting the surface of weather-resistant bridge steel components to bring the surface quality to the Sa2 level; (3) using a spray device to uniformly spray the treatment liquid onto the side elevation, top surface, bottom surface, and other portions of the component; (4) Removing the liquid that has accumulated on the top and bottom surfaces, and (5) Thoroughly ventilating and drying the components.

[0020] A brown rust layer of uniform color and no flow of rust liquid is formed on the surface of the 690 MPa weathering steel bridge member obtained by the method of the present invention.

[0021] In the present invention, the standard of Sa2 level is in accordance with Article 3.2.3 of the National Standard GB 8923-88 of the People's Republic of China, Rust Grade and Rust Removal Grade of Steel Surface before Painting.

[0022] The principle of the stabilization treatment method for 690 MPa weathering steel bridge members of the present invention is as follows.

[0023] The purpose of stirring using a mixer in the process of preparing the treatment liquid is, on the one hand, to mix the various components uniformly, and, on the other hand, to sufficiently hydrate the thickener components in the treatment liquid to form a polymeric substance and increase the viscosity of the treatment liquid.

[0024] Sandblasting the surface of 690MPa weathering steel bridge components can remove iron oxide scale from the surface of the components and improve surface roughness. This increases the amount of treatment solution that adheres to the surface of the components and the reaction time, improving the effectiveness of the rust layer stabilization treatment.

[0025] The amount of treatment liquid applied to the surface of the component directly affects the color of the surface rust layer after treatment, so it is necessary to ensure uniform spraying during the treatment process and remove the liquid that has accumulated on the top, bottom, and other parts of the component. This ensures that the surface color of the component after treatment is uniform. Preferably, the amount of treatment liquid is ensured to be 1 to 2 liters per square meter.

[0026] The air drying increases the oxygen content in the treatment solution, accelerating the chemical and electrochemical reactions in the stabilization treatment.

[0027] According to the present invention's method for preparing a stabilization treatment liquid for weather-resistant bridge steel components having a 690 MPa level, or the present invention's method for stabilization treatment of weather-resistant bridge steel components having a 690 MPa level, the stirring in step (1) is preferably performed using a mixer, and the stirring speed is preferably set to 300 to 500 rpm, for example, 300 rpm, 350 rpm, 400 rpm, 440 rpm, or 500 rpm.

[0028] Furthermore, the stirring time of the treatment solution in step (1) is 1 to 2 hours, for example, 1 hour, 1.2 hours, 1.5 hours, 1.6 hours, 1.8 hours, or 2 hours. Preferably, the dosage of the treatment liquid in step (3) is 1 to 2 liters / square meter, for example 1 liter / square meter, 1.2 liters / square meter, 1.5 liters / square meter, 1.8 liters / square meter, 2 liters / square meter.

[0029] According to the present invention's method for treating a stabilization treatment liquid for weathering bridge steel components having a 690 MPa level or the stabilization treatment method for weathering bridge steel components having a 690 MPa level, preferably, in step (4), the accumulated liquid is removed using a roller brush.

[0030] According to the present invention's method for the stabilization treatment liquid for weather-resistant bridge steel components having a level of 690 MPa, or the stabilization treatment method for weather-resistant bridge steel components having a level of 690 MPa, the aeration and drying time is preferably 15 days or more, for example, 15 days, 2 days, 25 days, 28 days, 29 days, or 30 days.

[0031] According to the present invention's method for treating a stabilization treatment solution for a 690 MPa-level weathering steel member for bridges or the present invention's method for treating a stabilization solution for a 690 MPa-level weathering steel member for bridges, the air drying in step (5) is preferably carried out outdoors.

[0032] When the component is placed outdoors, the surface of the component is exposed to alternating wet and dry environments due to the action of rain, dew, and sunlight, which promotes the formation of a stable rust layer on the surface of the component.

[0033] More preferably, the air drying time is 15 to 30 days. The longer the air drying time, the more stable the rust layer of the member becomes.

[0034] The stabilized rust layer obtained by using the stabilization treatment liquid and treatment method for 690 MPa weathering steel bridge members of the present invention has the following technical parameters: (1) The thickness of the surface rust layer of the member is 80 μm or more, for example, 85 μm, 88 μm, 90 μm, 92 μm, 95 μm; (2) The color difference value ΔE of the surface rust layer of different parts of the member is 10 or less, for example, 4, 4.5, 5, 6, 7, 9; (3) The amount of the surface rust layer of the member is 25 g / m 2 For example, 28g / m 2 , 29g / m 2 , 30g / m 2 , 32g / m 2 , 35g / m 2 It is.

[0035] The technical parameters of natural rusting of 690MPa-level weathering steel bridge members are as follows: (1) the thickness of the surface rust layer of the member is 10-40μm, (2) the color difference value ΔE of the surface rust layer of different parts of the member is 20-50, (3) the amount of the surface rust layer of the member is 5-10g / m 2 It is.

[0036] The present invention also provides an application of the above stabilization treatment solution in the stabilization treatment of weather-resistant bridge steel members having a strength of 690 MPa.

[0037] Effect of the Invention Compared with the prior art, the present invention has the following advantages:

[0038] (1) The present invention can realize rust layer stabilization treatment of 690 MPa level weathering steel bridge components, and after treatment, a brown rust layer with a uniform color and no flow of rust liquid is formed on the surface of the 690 MPa level weathering steel bridge components.

[0039] (2) The treatment liquid for 690 MPa weathering steel bridge components of the present invention comprises an erosion agent, a rust layer stabilizer, a moisturizer, a thickener and water. The treatment liquid can be uniformly adhered to the sides, backs, top and bottom surfaces of the components and can extend the time of electrochemical and chemical reaction with the surface of the components.

[0040] (3) The thickness of the surface rust layer of the 690 MPa level weathering steel bridge member treated by the present invention is 80 μm or more, the color difference value ΔE of the surface rust layer of different parts of the member is 10 or less, and the amount of the surface rust layer of the member is 25 g / m 2 That's all. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] In order to better explain the present invention, a stabilization treatment solution and a treatment method for weathering steel members of bridges at a level of 690 MPa will be described in detail below in conjunction with specific examples.

[0042] The test methods for the parameters in the examples are as follows: Measurement of rust layer thickness: Use a coating thickness gauge to measure the rust layer thickness of weathering bridge steel members. Select a measurement area of ​​less than 0.01 square meters, select 10 points in this area to measure the rust layer thickness, and calculate the average rust layer thickness of the measurement points.

[0043] Measurement of color difference value ΔE of surface rust layer in different parts of the member: Use a color difference meter to detect the color uniformity of the rust layer of weather-resistant bridge steel members. Select a rust layer at a certain point on the detection target part as a standard sample, measure the color difference value ΔE of the rust layer at 10 points on the member, and calculate the average color difference value ΔE of the detection points.

[0044] Measuring the amount of surface rust layer of a component: The amount of surface rust layer of a component is measured by the weight loss method. In component processing, 3 to 5 test pieces are processed at the same time, and the length, width, height and weight W1 of the test pieces are measured, and the surface area S is calculated. The test pieces are pickled to remove rust, and the weight W2 after pickling is weighed. The amount of surface rust layer of a component = (W1-W2) / S.

[0045] Example 1: A stabilization treatment liquid for weather-resistant bridge steel members at 690 MPa level was prepared in mass%, and the mass% contents of each component were weighed out to be 3% ferric chloride, 1% sodium hydrogen sulfite, 3% chromium sulfate, 1% potassium permanganate, 1% polypropylene glycol, and 2% sodium carboxymethylcellulose, with the remainder of polypropylene glycol being deionized water. The mixing speed was set to 300 rpm using a mixer, and the treatment liquid was stirred for 1 hour. The surface of the weather-resistant bridge steel member was sandblasted, and the surface quality reached the Sa2 level. The treatment liquid was sprayed evenly on the side elevation, top, bottom, and other parts of the member using a spray device, and the amount of treatment liquid was 1.8 liters / m2. The liquid accumulated on the top and bottom was removed using a roller brush. The member was left outdoors for 15 days and allowed to dry by ventilation. After treatment, a brown rust layer with a uniform color and no flow of rust liquid was formed on the surface of the 690MPa-level weathering bridge steel member. The thickness of the surface rust layer of the member was 85 μm, the color difference value ΔE of the surface rust layer of different parts of the member was 9, and the amount of the surface rust layer of the member was 28 g / m 2 It was.

[0046] Example 2: A stabilization treatment liquid for weather-resistant bridge steel members of 690 MPa level was prepared in mass%, and the mass% contents of each component were weighed out to be 4% ferric chloride, 1.5% sodium hydrogen sulfite, 4% chromium sulfate, 2% potassium permanganate, 2% polypropylene glycol, and 3% sodium carboxymethylcellulose, with the remainder being deionized water. The stirring speed was set to 400 rpm using a mixer, and the treatment liquid was stirred for 2 hours. The surface of the weather-resistant bridge steel member was sandblasted, and the surface quality reached Sa2 level. The treatment liquid was sprayed evenly on the side elevation, top, bottom, etc. of the member using a spray device, and the amount of treatment liquid was 1.5 liters / m2. The liquid accumulated on the top and bottom was removed using a roller brush. The member was left outdoors for 30 days and dried by ventilation. After treatment, a brown rust layer with a uniform color and no flow of rust liquid is formed on the surface of the 690MPa-level weathering bridge steel member. The thickness of the surface rust layer of the member is 90μm, the color difference value ΔE of the surface rust layer of different parts of the member is 5, and the amount of the surface rust layer of the member is 30g / m2 It was.

[0047] Example 3: A stabilization treatment liquid for weathering bridge steel members at 690 MPa level was prepared in mass%, and the mass% contents of each component were weighed out to be ferric chloride 7%, sodium hydrogen sulfite 2%, chromium sulfate 6%, potassium permanganate 4%, polypropylene glycol 2%, and sodium carboxymethylcellulose 5%, with the remainder being deionized water. The stirring speed was set to 500 rpm using a mixer, and the treatment liquid was stirred for 2 hours. The surface of the weathering bridge steel member was sandblasted, and the surface quality reached Sa2 level. The treatment liquid was sprayed evenly on the side elevation, top, bottom, and other parts of the member using a spray device, and the amount of treatment liquid was 1 liter / m2. The liquid accumulated on the top and bottom was removed using a roller brush. The member was left outdoors for 28 days and dried by ventilation. After treatment, a brown rust layer with a uniform color and no flow of rust liquid was formed on the surface of the 690MPa-level weathering bridge steel member. The thickness of the surface rust layer of the member was 88 μm, the color difference value ΔE of the surface rust layer of different parts of the member was 6, and the amount of the surface rust layer of the member was 32 g / m 2 It was.

[0048] Example 4: A stabilization treatment liquid for a weather-resistant bridge steel member of 690 MPa level was prepared in mass%, and the mass% contents of each component were weighed out to be ferric chloride 6%, sodium hydrogen sulfite 1.6%, chromium sulfate 5.5%, potassium permanganate 3.5%, polypropylene glycol 1.5%, and sodium carboxymethylcellulose 3.5%, with the remainder being deionized water. The stirring speed was set to 350 rpm using a mixer, and the treatment liquid was stirred for 1.5 hours. The surface of the weather-resistant bridge steel member was sandblasted, and the surface quality reached the Sa2 level. The treatment liquid was sprayed evenly on the side elevation, top, bottom, and other parts of the member using a spray device, and the amount of the treatment liquid was 1.2 liters / m2. The liquid accumulated on the top and bottom was removed using a roller brush. The member was left outdoors for 25 days and dried by air circulation. After treatment, a brown rust layer with a uniform color and no flow of rust liquid was formed on the surface of the 690MPa-level weathering bridge steel member. The thickness of the surface rust layer of the member was 88 μm, the color difference value ΔE of the surface rust layer of different parts of the member was 7, and the amount of the surface rust layer of the member was 29 g / m 2 It was.

[0049] Example 5: A stabilization treatment liquid for weathering bridge steel members of 690 MPa level was prepared in mass%, and the mass% contents of each component were weighed out to be 4.5% ferric chloride, 1.9% sodium hydrogen sulfite, 4.5% chromium sulfate, 2.5% potassium permanganate, 1.7% polypropylene glycol, and 3.8% sodium carboxymethylcellulose, with the remainder being deionized water. The stirring speed was set to 440 rpm using a mixer, and the treatment liquid was stirred for 1.6 hours. The surface of the weathering bridge steel member was sandblasted, and the surface quality reached Sa2 level. The treatment liquid was sprayed evenly on the side elevation, top, bottom, etc. of the member using a spray device, and the amount of the treatment liquid was 2 liters / m2. The liquid accumulated on the top and bottom was removed using a roller brush. The member was left outdoors for 29 days and dried by ventilation. After treatment, a brown rust layer with a uniform color and no flow of rust liquid was formed on the surface of the 690MPa-level weathering bridge steel member. The thickness of the surface rust layer of the member was 92 μm, the color difference value ΔE of the surface rust layer of different parts of the member was 4.5, and the amount of the surface rust layer of the member was 27 g / m 2 It was.

[0050] The above-mentioned examples are merely some of the preferred examples, and do not limit the embodiments of the present invention.

Claims

1. A stabilization treatment liquid for weather-resistant bridge steel members of 690 MPa level, The stabilization treatment liquid for the weather-resistant bridge steel member of 690 MPa level includes an erosion agent, a rust layer stabilizer, a moisturizing agent, and a thickener, the erosion agent being composed of ferric chloride and sodium hydrogen sulfite, the rust layer stabilizer being composed of chromium sulfate and potassium permanganate, the moisturizing agent being polypropylene glycol, and the thickener being sodium carboxymethylcellulose, The mass% content of each component of the stabilization treatment solution is as follows: The ferric chloride content is 3-7%. The sodium bisulfite content is 1-2%. The chromium sulfate content is 3-6%. The potassium permanganate content is 1-4%. The polypropylene glycol content is 1-2%. The content of sodium carboxymethylcellulose is 2-5%. A stabilization treatment solution for weathering bridge steel components having a resistance of 690 MPa, the remainder of which is deionized water.

2. The stabilization treatment solution for 690 MPa level weathering steel members according to claim 1, characterized in that the mass % contents of each component in the stabilization treatment solution are 4-5% ferric chloride, 1-2% sodium hydrogen sulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-2% polypropylene glycol, 2-4% sodium carboxymethylcellulose, and the remainder being deionized water.

3. The stabilization treatment solution for 690 MPa level weathering steel members according to claim 1, characterized in that the mass % contents of each component in the stabilization treatment solution are 4-5% ferric chloride, 1-1.5% sodium hydrogen sulfite, 4-5% chromium sulfate, 2-3% potassium permanganate, 1-1.5% polypropylene glycol, 2-3% sodium carboxymethylcellulose, and the remainder is deionized water.

4. A stabilization treatment method for 690 MPa weathering steel bridge members, comprising the steps of: (1) According to the formulation of the stabilization treatment liquid for 690 MPa-level weather-resistant bridge steel members according to any one of claims 1 to 3, a treatment liquid is prepared in a mass% ratio, and the treatment liquid is thoroughly stirred at a stirring speed not exceeding 500 rpm; (2) Sandblast the surface of weather-resistant bridge steel components to achieve a surface quality of Sa2 level; (3) using a spray device to uniformly spray the treatment liquid onto the side elevation, top, and bottom surfaces of the component; (4) Removing the liquid that has accumulated on the top and bottom; and (5) A stabilization treatment method for a 690 MPa level weathering steel component for a bridge, characterized in that the method comprises thoroughly aerating and drying the component so as to form a brown rust layer of uniform color and free of flow of rust liquid on the surface of the 690 MPa level weathering steel component.

5. The method according to claim 4, characterized in that the stirring in step (1) is performed by a mixer, and the stirring speed is set to 300 to 500 revolutions per minute.

6. 5. The method according to claim 4, wherein the stirring time of the treatment solution in step (1) is 1 to 2 hours.

7. 5. The method according to claim 4, wherein the dosage of the treatment liquid in step (3) is 1-2 liters per square meter.

8. 5. The method of claim 4, wherein step (4) includes removing accumulated liquid using a roller brush.

9. 5. The method for treating stabilization treatment liquid for 690 MPa weathering steel bridge members according to claim 4, characterized in that the aeration and drying time in step (5) is 15 days or more.

10. The method according to claim 4, wherein the air drying time in step (5) is 15 to 30 days.

11. 5. The method according to claim 4, wherein the air drying in step (5) is carried out outdoors.

12. Application of the stabilization treatment solution according to any one of claims 1 to 3 in the stabilization treatment of weather-resistant bridge steel members having a strength of 690 MPa.

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