CN113930753B - Stabilizing treatment agent and method for hot-rolled weather-resistant steel rust layer - Google Patents

Stabilizing treatment agent and method for hot-rolled weather-resistant steel rust layer Download PDF

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CN113930753B
CN113930753B CN202111090331.5A CN202111090331A CN113930753B CN 113930753 B CN113930753 B CN 113930753B CN 202111090331 A CN202111090331 A CN 202111090331A CN 113930753 B CN113930753 B CN 113930753B
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rust layer
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CN113930753A (en
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郎丰军
李江文
程鹏
洪霞
庞涛
陈勇
马颖
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel

Abstract

The invention discloses a stabilizing treatment agent for a hot-rolled weather-resistant steel rust layer, which is divided into a pretreatment component A and a post-treatment component B; the pretreatment component A is pickling waste liquid with the pH value of 1-5, wherein the concentration range of each ion is as follows: fe (Fe) 3+ The ion content is 40-100 g/L, fe 2+ The ion content is 30-90 g/L, cl ‑ The ion content is 50-120 g/L; the aftertreatment component B is K 2 Cr 2 O 7 、Sb(NO 3 ) 3 、SnSO 4 Wherein K is 2 Cr 2 O 7 The content of the Sb (NO) is 20-50 g/L 3 ) 3 The content is 10-20 g/L, snSO 4 The content is 5-10 g/L. The invention can realize the stabilization treatment of the rust layer of the hot-rolled weathering steel with the iron scale, and the surface of the hot-rolled weathering steel is changed into a brown rust layer from the iron scale after the treatment; meanwhile, the acid washing waste liquid is reused; after the treatment, the thickness of the rust layer on the surface of the hot-rolled weathering steel is more than 10 mu m, the color difference delta E value of the rust layer is more than 65, and the appearance of the rust layer is fine and uniform brown particles.

Description

Stabilizing treatment agent and method for hot-rolled weather-resistant steel rust layer
Technical Field
The invention relates to a stabilizing treatment agent for a hot-rolled weather-resistant steel rust layer and a treatment method.
Background
Under the natural bare condition, the surface of the weathering steel is formedThe time required for a dense stable protective rust layer is longer. During this period, environmental pollution such as sagging and scattering of rust solution often occurs. Especially when contaminants (Cl) in the atmosphere - 、SO 2 ) When the concentration is higher, the sagging phenomenon is more serious, not only causes a certain pollution to the environment, but also greatly influences the beauty of the weathering steel building. Therefore, for these areas, rust stabilization treatment is required for the weathering steel for paint-free use.
The surface of the hot-rolled weathering steel is covered with a layer of oxide, which can affect the stabilization treatment quality of the rust layer. Therefore, the conventional rust layer stabilization treatment technology mostly needs to remove iron scales on the surface of weathering steel, and the methods include an acid washing method, a sand blasting method and the like. The pickling method is to use the strong acid solution such as hydrochloric acid to oxidize the surface of the steel plate or the component, the process is fast, the rust removal is complete, and the pickling method is most widely applied in the steel industry. However, as the number of times of use of the pickling solution increases, the acid concentration decreases and the carried-in impurities gradually increase, so that the effect of pickling to remove scale is not achieved and the pickling solution becomes waste liquid. The pickling waste liquid contains a large amount of waste acid, ferric salt and other substances, belongs to serious-hazard pollutants, has more impurities, complex treatment process and high treatment cost. Therefore, development of the rust layer stabilizing treatment agent by utilizing the pickling waste liquid and combination of the treatment process are of great significance in forming a stable rust layer on the surface of the hot-rolled weathering steel with the oxidized iron scale.
CN201210497491.6 discloses a spray pretreatment method for accelerating the stabilization of rust layers on the surface of weathering steel, wherein the treating agent comprises 0.1 to 3 percent of NaCl and 0.3 to 3 percent of FeSO 4 、0.1％～3％CuSO 4 And 0.3% -3% NaHSO 3 Mixing with water, and stirring.
CN201310083703.0 discloses a stabilizing agent for rust layer on surface of weathering resistant steel and its preparation method, the agent comprises 25-45% alkyd varnish, 4-12% copper pyrophosphate, 2-10% barium chromate, 1-14% Fe 3 O 4 20 to 50 percent of Fe 2 O 3 1-10% solvent oil and 0.5-5% dispersing agent.
CN201010201707.0 discloses a surface stabilizing treatment agent for weathering steel, the treatment agent is composed of 38-47 main agents, 1.8-16 auxiliary agents, 1-2 modifying agents, 1-3 accelerating agents, 0.5-3 rust inhibitors, 1-1.5 initiator, 0.002-0.005 additive and the balance of ethanol.
CN201710068872.5 discloses a treating agent for rapidly generating a stabilized rust layer on the surface of weathering steel and a use method thereof, wherein the treating agent consists of an agent A and an agent B, and the agent A comprises the following components in percentage by mass: cuSO4#0.4% -2%, naCl#0.1% -2.5%, feCl3#0.5% -3%, HCl#0.1% -0.5% and the balance water; the agent B is humectant water solution, the mass percentage of humectant is 0.2% -3.5%, and the balance is water; the humectant is NaH 2 PO 4 、Na 5 P 3 O 10 、(NaPO 3 ) 6 、C 6 H 5 Na 3 O 7 ·2H 2 One or more of O.
The prior art does not relate to a treating agent and a treating method for stabilizing hot-rolled weathering steel with oxidized iron scale by utilizing pickling waste liquid.
Disclosure of Invention
The invention aims to provide a stabilizing treatment agent and a treatment method for a hot-rolled weather-resistant steel rust layer, and meanwhile, the recycling of pickling waste liquid is realized.
In order to achieve the above purpose, the following technical scheme is adopted:
the stabilizing treating agent for the rust layer of the hot-rolled weathering steel is divided into a pretreatment component A and a post-treatment component B;
the pretreatment component A is pickling waste liquid, the pH value is 1-5, and the concentration range of each ion is as follows: fe (Fe) 3+ The ion content is 40-100 g/L, fe 2+ The ion content is 30-90 g/L, cl - The ion content is 50-120 g/L;
the aftertreatment component B is K 2 Cr 2 O 7 、Sb(NO 3 ) 3 、SnSO 4 (rust layer-stabilizing accelerator), wherein K 2 Cr 2 O 7 The content of the Sb (NO) is 20-50 g/L 3 ) 3 The content is 10-20 g/L, snSO 4 The content is 5-10 g/L.
According to the scheme, the pickling waste liquid is from the pickling waste liquid of the cold rolling mill cold rolling production line of the cold rolling mill.
The stabilization treatment method of the hot-rolled weather-resistant steel rust layer comprises the following steps:
(1) Cleaning the surface of the hot-rolled weather-resistant steel to ensure that the surface is free of oil stains, dust and paint;
(2) Heating the pretreatment component A to 50-70 ℃, uniformly brushing the pretreatment component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2-3 hours; repeatedly brushing, ventilating and drying for 3-5 times; a uniform yellow rust layer is formed on the surface of the hot-rolled weather-resistant steel, and no bare iron scale exists;
(3) Heating the post-treatment component B to 70-90 ℃, uniformly brushing a yellow rust layer formed on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1-2 hours; repeatedly brushing, ventilating and drying for 2-4 times; and forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists.
The invention utilizes the residual acidity in the pickling waste liquid to dissolve the iron oxide scale and utilizes Fe 3+ Has oxidizing property, and oxidizes simple substance Fe in matrix and oxide skin into Fe 2+ Ions. At the same time, cl - The atomic radius is small, and the steel can penetrate through an oxide layer and a passivation film on the surface of the hot-rolled weather-resistant steel to enter a steel base, and erode the base body to rust the steel plate. The pretreatment component A removes the scale on the surface of the hot-rolled weather-resistant steel, and finally forms a yellow oxide layer mainly comprising gamma-FeOOH and beta-FeOOH.
Cr in the aftertreatment component B 2 O 7 2- 、NO 3 - 、SO 4 2- The anions have strong oxidizing property, and can convert gamma-FeOOH and beta-FeOOH in the rust layer into stable rust layer component alpha-FeOOH. In addition, sb 3+ 、Sn 2+ Ions can be deposited in the rust layer, the addition of Sn and Sb elements increases the corrosion potential of the rust layer, reduces the self-corrosion current density, plays a role in inhibiting the dissolution of the weathering steel anode, increases the resistance of the rust layer, and enhances the protection of the rust layer on the steel matrix.
The pretreatment component A is heated to 50-70 ℃, so that the reactivity of the pickling waste liquid is improved, and the dissolution of iron oxide scale is accelerated. Air drying for 2-3 hours, and repeatedly brushing and air drying for 3-5 times, wherein the process ensures that the surface of the steel plate is dry and wet alternately; the surface of the steel plate can be wetted by brushing pickling waste liquid, a thin liquid film environment can be provided for promoting corrosion electrochemical reaction, the concentration of effective components of the pickling waste liquid is increased by tens of times after the water content of the pickling waste liquid is evaporated, and the dissolution of iron scales and the rusting of the steel plate are accelerated.
The post-treatment component B is heated to 70-90 ℃, so that the reaction activity of the reagent is improved, the conversion of gamma-FeOOH and beta-FeOOH in the rust layer to stable rust layer component alpha-FeOOH is accelerated, and Sb is promoted 3+ 、Sn 2+ Deposition of ions in the rust layer. Air drying for 1-2 hours, repeatedly brushing and air drying for 2-4 times, wherein the process ensures that the surface of the steel plate is dry and wet alternately; the concentration of the reactant in the evaporation process of the water is increased by tens of times, so that the generation of alpha-FeOOH and the enrichment of Sn and Sb elements in the rust layer are further promoted.
Compared with the prior art, the invention has the advantages that:
the invention can realize the stabilization treatment of the hot-rolled weathering steel rust layer with the iron scale, and the surface of the hot-rolled weathering steel is changed into a brown rust layer from the iron scale after the treatment.
The treating agent disclosed by the invention utilizes the pickling waste liquid as a component, so that the reutilization of the pickling waste liquid is realized.
The thickness of the rust layer on the surface of the hot-rolled weathering steel treated by the method is more than 10 mu m, the color difference delta E value of the rust layer is more than 65, and the appearance of the rust layer is fine and uniform brown particles.
Drawings
Fig. 1: the surface of the hot-rolled weather-resistant steel which is not subjected to rust layer stabilization treatment;
fig. 2: the surface of the hot-rolled weathering steel subjected to the rust layer stabilization treatment of the present invention.
Detailed Description
The following examples further illustrate the technical aspects of the present invention, but are not intended to limit the scope of the present invention.
The invention provides a stabilizing treatment agent for a hot-rolled weather-resistant steel rust layer, which comprises a pretreatment component A and a post-treatment component B, wherein the component A is firstly coated and then the component B is coated when the stabilizing treatment agent is used;
the pretreatment component A is acid washing wasteThe pH value of the liquid is 1-5, wherein the concentration range of each ion is as follows: fe (Fe) 3+ The ion content is 40-100 g/L, fe 2+ The ion content is 30-90 g/L, cl - The ion content is 50-120 g/L;
the aftertreatment component B is K 2 Cr 2 O 7 、Sb(NO 3 ) 3 、SnSO 4 (rust layer-stabilizing accelerator), wherein K 2 Cr 2 O 7 The content of the Sb (NO) is 20-50 g/L 3 ) 3 The content is 10-20 g/L, snSO 4 The content is 5-10 g/L.
Wherein the pickling waste liquid is from pickling waste liquid of an acid rolling production line of a cold rolling mill.
The invention also provides a stabilization treatment method for the hot-rolled weather-resistant steel rust layer, which comprises the following steps:
(1) Cleaning the surface of the hot-rolled weather-resistant steel to ensure that the surface is free of oil stains, dust and paint;
(2) Heating the pretreatment component A to 50-70 ℃, uniformly brushing the pretreatment component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2-3 hours; repeatedly brushing, ventilating and drying for 3-5 times; a uniform yellow rust layer is formed on the surface of the hot-rolled weather-resistant steel, and no bare iron scale exists;
(3) Heating the post-treatment component B to 70-90 ℃, uniformly brushing a yellow rust layer formed on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1-2 hours; repeatedly brushing, ventilating and drying for 2-4 times; and forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists.
Example 1
Acid washing waste liquid is used as a pretreatment component A, wherein the ion concentration is as follows: fe (Fe) 3+ The ion content is 40g/L, fe 2 + The ion content is 30g/L, cl - The ion content was 50g/L and the pH was 5.
Configuring a post-treatment component B, wherein K 2 Cr 2 O 7 The content of Sb (NO) is 20g/L 3 ) 3 The content is 10g/L, snSO 4 The content is 5/L.
Cleaning the surface of the hot-rolled weather-resistant steel, and ensuring that the surface is free of oil stains, dust and paint. And heating the component A to 50 ℃, uniformly coating the component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2 hours. The brushing and the ventilation drying are repeated for 3 times. And forming a uniform yellow rust layer on the surface of the hot-rolled weather-resistant steel until no bare iron scale exists. And heating the component B to 70 ℃, uniformly coating the component B on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1 hour. The brushing and the ventilation drying are repeated for 2 times. And forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists. After the coating, the rust layer on the surface of the weathering steel bridge turns into dark brown, the thickness of the rust layer on the surface is 11 mu m, the color difference delta E value of the rust layer is 66, and the appearance of the rust layer is in fine and uniform brown particles.
The surface of the hot-rolled weathering steel without rust layer stabilization treatment is shown in FIG. 1; the surface of the hot-rolled weathering steel subjected to the rust layer stabilization treatment of this example is shown in FIG. 2.
Example 2
Acid washing waste liquid is used as a pretreatment component A, wherein the ion concentration is as follows: fe (Fe) 3+ The ion content is 100g/L, fe 2+ The ion content is 90g/L, cl - The ion content was 120g/L and the pH was 1.
Configuring a post-treatment component B, wherein K 2 Cr 2 O 7 The content of Sb (NO) is 50g/L 3 ) 3 The content is 20g/L, snSO 4 The content is 10g/L.
Cleaning the surface of the hot-rolled weather-resistant steel, and ensuring that the surface is free of oil stains, dust and paint. And heating the component A to 70 ℃, uniformly coating the component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 3 hours. The brushing and the ventilation drying are repeated for 5 times. And forming a uniform yellow rust layer on the surface of the hot-rolled weather-resistant steel until no bare iron scale exists. And heating the component B to 90 ℃, uniformly coating the component B on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2 hours. The brushing and the ventilation drying are repeated for 4 times. And forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists. After being painted, the rust layer on the surface of the weathering steel bridge turns into dark brown, the thickness of the rust layer on the surface is 15 mu m, the color difference delta E value of the rust layer is 69, and the appearance of the rust layer is in fine and uniform brown particles.
Example 3
Acid washing waste liquid is used as pretreatment componentA, wherein each ion concentration is: fe (Fe) 3+ The ion content is 50g/L, fe 2 + The ion content is 60g/L, cl - The ion content was 90g/L and the pH was 3.
Configuring a post-treatment component B, wherein K 2 Cr 2 O 7 The content of Sb (NO) is 40g/L 3 ) 3 The content is 15g/L, snSO 4 The content is 8g/L.
Cleaning the surface of the hot-rolled weather-resistant steel, and ensuring that the surface is free of oil stains, dust and paint. And heating the component A to 60 ℃, uniformly coating the component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2.5 hours. The brushing and the ventilation drying are repeated for 4 times. And forming a uniform yellow rust layer on the surface of the hot-rolled weather-resistant steel until no bare iron scale exists. And heating the component B to 80 ℃, uniformly coating the component B on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1.5 hours. The brushing and the ventilation drying are repeated for 2 times. And forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists. After being painted, the rust layer on the surface of the weathering steel bridge turns into dark brown, the thickness of the rust layer on the surface is 13 mu m, the color difference delta E value of the rust layer is 68, and the appearance of the rust layer is in fine and uniform brown particles.
Example 4
Acid washing waste liquid is used as a pretreatment component A, wherein the ion concentration is as follows: fe (Fe) 3+ The ion content is 90g/L, fe 2 + The ion content is 80g/L, cl - The ion content was 100g/L and the pH was 4.
Configuring a post-treatment component B, wherein K 2 Cr 2 O 7 The content of Sb (NO) is 30g/L 3 ) 3 The content is 12g/L, snSO 4 The content is 6g/L. Cleaning the surface of the hot-rolled weather-resistant steel, and ensuring that the surface is free of oil stains, dust and paint. And heating the component A to 55 ℃, uniformly coating the component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 3 hours. The brushing and the ventilation drying are repeated for 3 times. And forming a uniform yellow rust layer on the surface of the hot-rolled weather-resistant steel until no bare iron scale exists. And heating the component B to 85 ℃, uniformly coating the component B on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2 hours. The brushing and the ventilation drying are repeated for 4 times. A uniform brown rust layer is formed on the surface of the hot-rolled weather-resistant steel, and no yellow rust layer is formedUntil that point. After being painted, the rust layer on the surface of the weathering steel bridge turns into dark brown, the thickness of the rust layer on the surface is 14 mu m, the color difference delta E value of the rust layer is 67, and the appearance of the rust layer is in fine and uniform brown particles.
Example 5
Acid washing waste liquid is used as a pretreatment component A, wherein the ion concentration is as follows: fe (Fe) 3+ The ion content is 500g/L, fe 2+ The ion content is 80g/L, cl - The ion content was 60g/L and the pH was 2.
Configuring a post-treatment component B, wherein K 2 Cr 2 O 7 The content of Sb (NO) is 25g/L 3 ) 3 The content is 19g/L, snSO 4 The content is 6g/L.
Cleaning the surface of the hot-rolled weather-resistant steel, and ensuring that the surface is free of oil stains, dust and paint. And heating the component A to 67 ℃, uniformly coating the component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2-3 hours. The brushing and the ventilation drying are repeated for 4 times. And forming a uniform yellow rust layer on the surface of the hot-rolled weather-resistant steel until no bare iron scale exists. And heating the component B to 88 ℃, uniformly coating the component B on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1.5 hours. The brushing and the ventilation drying are repeated for 3 times. And forming a uniform brown rust layer on the surface of the hot-rolled weathering steel until no yellow rust layer exists. After the coating, the rust layer on the surface of the weathering steel bridge turns into dark brown, the thickness of the rust layer on the surface is 16 mu m, the color difference delta E value of the rust layer is 70, and the appearance of the rust layer is in fine and uniform brown particles.

Claims (3)

1. A stabilization treatment method for a hot-rolled weathering steel rust layer is characterized by comprising the following steps:
(1) Cleaning the surface of the hot-rolled weather-resistant steel to ensure that the surface is free of oil stains, dust and paint;
(2) Uniformly coating the pretreatment component A on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 2-3 hours; repeatedly brushing, ventilating and drying for 3-5 times; a uniform yellow rust layer is formed on the surface of the hot-rolled weather-resistant steel, and no bare iron scale exists; the pretreatment component A is pickling waste liquid with the pH value of 1-5, wherein the concentration range of each ion is as follows: fe (Fe) 3+ The ion content is 40-100 g/L, fe 2+ Ion content30-90 g/L of Cl - The ion content is 50-120 g/L; the pickling waste liquid is from pickling waste liquid of a cold rolling mill acid rolling production line;
(3) Uniformly coating the post-treatment component B on a yellow rust layer formed on the surface of the hot-rolled weather-resistant steel, and carrying out ventilation drying for 1-2 hours; repeatedly brushing, ventilating and drying for 2-4 times; forming a uniform brown rust layer on the surface of the hot-rolled weather-resistant steel until no yellow rust layer exists; the aftertreatment component B is K 2 Cr 2 O 7 、Sb(NO 3 ) 3 、SnSO 4 Wherein K is 2 Cr 2 O 7 The content of the Sb (NO) is 20-50 g/L 3 ) 3 The content is 10-20 g/L, snSO 4 The content is 5-10 g/L.
2. A method for stabilizing a hot-rolled weathering steel rust layer as claimed in claim 1, wherein step 2 is carried out by heating the pretreatment component A to 50 to 70℃before brushing.
3. The method for stabilizing a hot-rolled weathering steel rust layer according to claim 1, characterized in that step 3 is to heat the aftertreatment component B to 70 to 90 ℃ before brushing.
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