Construction process for recast coastal region household garbage storage pit steel structure surface anti-corrosion coating, anti-corrosion coating and application

Abstract

The invention relates to the technical field of constructional engineering, and particularly discloses a construction technology for recasting an anticorrosive coating on the surface of a domestic garbage storage pit steel structure in a coastal area, the anticorrosive coating and application, and the construction technology specifically comprises the following steps that S1, soot blowing and rust removing operation is conducted on the surface of the steel structure till metallic luster is exposed; s2, filling the sunken part with low surface treatment epoxy primer; s3, the flatness of the polished and filled position and the flatness of the unfilled position are kept; s4, low surface treatment epoxy primer is sprayed on the surface of the steel structure to form an anti-corrosion bottom layer; s5, polyurethane finish paint is sprayed on the surface of the anti-corrosion bottom layer to form an anti-corrosion surface layer; and S6, fireproof paint is sprayed on the surface of the anti-corrosion surface layer to form a fireproof layer, so that surface treatment of the steel structure and construction of all the coatings are completed. According to the scheme, corrosion of external corrosive media to the steel structure can be effectively prevented, the service life of the steel structure is prolonged, the method can be applied to steel structure anti-corrosion layer recasting or factory construction in coastal areas, and the problems that an existing steel structure coating is prone to corrosion and short in service life are solved.

Description

Technical Field

[0001] The present application relates to the field of construction engineering, and in particular to a construction process for recasting an anti-corrosion coating on the surface of a steel structure of a domestic garbage storage pit in a coastal area, an anti-corrosion coating and its application. Background Art

[0002] As a major type of building structure, steel structure is made of steel materials. It has many significant advantages, such as high strength and ability to withstand large loads; light weight, which can reduce the overall weight of the building; good overall rigidity, strong resistance to deformation, and good stability in construction projects. At the same time, the construction of steel structure is relatively simple, which makes it widely used in many fields such as large factories, venues, super high-rise buildings, bridges, etc. However, steel structure also has certain limitations. It is easily affected by corrosion, which is a problem that needs to be focused on and solved during the use of steel structure.

[0003] In order to prevent corrosion of steel structures and thus extend their service life, protective measures such as applying anti-corrosion paint on the surface of steel structures are usually taken. At present, the mainstream anti-corrosion processes for steel structures in China generally include the setting of coatings such as epoxy zinc-rich primer, epoxy micaceous iron intermediate paint, fire retardant coating, and polyurethane topcoat. However, the situation is rather special in coastal areas. The atmospheric humidity in the area often reaches more than 80% and contains a high concentration of salt. At the same time, the environment of domestic garbage storage pits in coastal areas is even worse. On the basis of high humidity and high salinity, there are also corrosive gases such as hydrogen chloride and sulfur oxides. Under the combined effect of these factors, chloride ions and sulfur ions will dissolve in the water film on the surface of the steel structure to form an acidic solution, posing a serious corrosion threat to the steel structure.

[0004] In the special environment of coastal areas, the current mainstream steel structure anti-corrosion technology in China is prone to failure under the corrosive effect of acidic solutions. Specifically, the coating is gradually destroyed, exposing the surface of the steel structure, which causes the steel structure to be directly exposed to the corrosive medium, further accelerating the corrosion process of the steel structure and seriously shortening the service life of the steel structure. This not only affects the normal use of the steel structure, but also may bring safety hazards and economic losses. Therefore, it is necessary to seek more effective solutions to deal with the anti-corrosion problem of steel structures in coastal areas. Summary of the invention

[0005] In view of this, the purpose of this application is to provide an anti-corrosion coating and an anti-corrosion coating and application for the surface of the steel structure of the domestic waste storage pit in the recast coastal area, so as to solve the problem of easy corrosion and short service life of the steel structure in the coastal area.

[0006] In order to achieve the above technical purpose, the present application provides a method for recasting an anti-corrosion coating on the surface of a steel structure of a domestic garbage storage pit in a coastal area, comprising the following steps:

[0007] Step S1, surface cleaning: performing soot blowing and rust removal operations on the surface of the steel structure until the surface of the steel structure reveals a metallic luster;

[0008] Step S2, base surface repair: using low surface treatment epoxy primer to fill the concave parts of the steel structure caused by rust removal operation;

[0009] Step S3, surface grinding: grinding the portion of the steel structure filled with the low surface treatment epoxy primer to ensure that the surface flatness of the filled portion is consistent with that of the unfilled portion, and cleaning up debris generated by grinding;

[0010] Step S4, spraying the anti-corrosion base layer: spraying a low surface treatment epoxy primer on the surface of the steel structure, and after the coating is dried, forming an anti-corrosion base layer with a thickness of not less than 240 um;

[0011] Step S5, spraying the anti-corrosion surface layer: spraying a polyurethane topcoat on the surface of the anti-corrosion base layer, and after the coating is dried, forming an anti-corrosion surface layer with a thickness of not less than 60 um;

[0012] Step S6, spraying of fireproof layer: spraying ultra-thin steel structure fireproof coating on the surface of the anti-corrosion surface layer, and after the coating is dried, a fireproof layer with a thickness of not less than 2100um is formed.

[0013] Furthermore, in step S1, rust removal is performed by shot blasting or sand blasting.

[0014] Furthermore, in step S1, a rust removal operation is performed to make the cleanliness of the surface of the steel structure reach sa2.0 / st2.0 level.

[0015] Furthermore, step S2 should be completed within two hours after step S1 is completed.

[0016] Furthermore, in step S4, the anti-corrosion base layer of the steel structure is formed by spraying multiple times, and the number of spraying times is not less than 2 times, and the thickness of a single spraying is not less than 120um.

[0017] Furthermore, in step S5, the anti-corrosion surface layer of the steel structure is formed by spraying multiple times, and the number of spraying times is not less than 2 times, and the thickness of a single spraying is not less than 30um.

[0018] Furthermore, in step S6, a steel structure fireproof layer is formed by spraying multiple times, and the number of spraying times is not less than 3 times, and the thickness of a single spraying is not less than 700um.

[0019] Furthermore, steps S1 to S6 are performed under the condition that the ambient humidity is less than 80%.

[0020] Secondly, the present application also provides an anti-corrosion coating for the surface of steel structures of domestic waste storage pits in recast coastal areas, including: a base repair layer, an anti-corrosion base layer, an anti-corrosion surface layer, and a fireproof layer.

[0021] The present application also provides an application of an anti-corrosion coating on the surface of a steel structure of a domestic waste storage pit in a coastal area, which sequentially forms a base repair layer, an anti-corrosion bottom layer, an anti-corrosion surface layer, and a fireproof layer on the surface of the steel structure for use in steel structures in coastal areas.

[0022] In summary, the present application provides a construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in the coastal area, comprising the following steps: step S1, surface cleaning: blowing off the soot and removing rust on the surface of the steel structure until the surface of the steel structure reveals a metallic luster; step S2, base surface repair: using a low surface treatment epoxy primer to fill the concave parts of the steel structure caused by the rust removal operation; step S3, surface grinding: grinding the parts of the steel structure filled with the low surface treatment epoxy primer to make the surface of the filled parts and the unfilled parts smooth. Keep the flatness consistent, and clean up the debris generated by grinding; Step S4, anti-corrosion base spraying: spray low surface treatment epoxy primer on the surface of the steel structure, and after the coating is dried, form an anti-corrosion base with a thickness of not less than 240um; Step S5, anti-corrosion surface spraying: spray polyurethane topcoat on the surface of the anti-corrosion base, and after the coating is dried, form an anti-corrosion surface with a thickness of not less than 60um; Step S6, fireproof layer spraying: spray ultra-thin steel structure fireproof coating on the surface of the anti-corrosion surface, and after the coating is dried, form a fireproof layer with a thickness of not less than 2100um. The construction process provided in this application ultimately constructs a coating system with both excellent anti-corrosion and excellent fireproof effects. Among them, the anti-corrosion base and the anti-corrosion surface cooperate with each other, which can effectively and effectively block the invasion of external corrosive media into the steel structure, thereby significantly extending the service life of the steel structure. The fireproof layer can not only play a vital role in heat insulation and flame retardancy in the event of a fire, effectively protecting the strength and stability of the steel structure, but also, based on its own unique characteristics, can also isolate corrosion factors such as moisture and oxygen to a certain extent, thereby further enhancing the overall anti-corrosion performance. At the same time, the coatings have shown good adhesion and compatibility through scientific and reasonable construction processes and carefully selected materials, effectively ensuring the stability and reliability of the entire coating system. Compared with existing technologies, this construction process is simple and easy to implement, does not require strict surface treatment of the base layer, has relatively low costs, and has the outstanding advantage of being applicable to the anti-corrosion of steel structures in coastal areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the structure of an anti-corrosion coating on the surface of a steel structure of a domestic garbage storage pit in a coastal area provided in an embodiment of the present application;

[0025] Figure 2 This is a physical picture of the anti-corrosion coating structure on the surface of the steel structure of the recast coastal domestic garbage storage pit provided in Example 1 of the present application, two years after it was put into use. DETAILED DESCRIPTION

[0026] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] The sources of all raw materials in the present invention are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0030] See also Figure 1The embodiment of the present invention provides a construction process for recasting an anti-corrosion coating on the surface of a steel structure of a domestic garbage storage pit in a coastal area, comprising the following steps:

[0031] Step S1, surface cleaning: performing soot blowing and rust removal operations on the surface of the steel structure until the surface of the steel structure reveals a metallic luster;

[0032] Step S2, base surface repair: using low surface treatment epoxy primer to fill the concave parts of the steel structure caused by rust removal operation;

[0033] Step S3, surface grinding: grinding the portion of the steel structure filled with the low surface treatment epoxy primer to ensure that the surface flatness of the filled portion is consistent with that of the unfilled portion, and cleaning up debris generated by grinding;

[0034] Step S4, spraying the anti-corrosion base layer: spraying a low surface treatment epoxy primer on the surface of the steel structure, and after the coating is dried, forming an anti-corrosion base layer with a thickness of not less than 240 um;

[0035] Step S5, spraying the anti-corrosion surface layer: spraying a polyurethane topcoat on the surface of the anti-corrosion base layer, and after the coating is dried, forming an anti-corrosion surface layer with a thickness of not less than 60 um;

[0036] Step S6, spraying of fireproof layer: spraying ultra-thin steel structure fireproof coating on the surface of the anti-corrosion surface layer, and after the coating is dried, a fireproof layer with a thickness of not less than 2100um is formed.

[0037] It should be noted that this technical solution ultimately forms a coating system that has both anti-corrosion and fire-proof effects. Among them, the anti-corrosion base layer and the anti-corrosion surface layer cooperate with each other to effectively prevent the external corrosive medium from eroding the steel structure and extend the service life of the steel structure. The fireproof layer can not only play a role in heat insulation and flame retardancy in the event of a fire, protecting the strength and stability of the steel structure, but also due to its own characteristics, it can also play a role in isolating corrosion factors such as moisture and oxygen to a certain extent, further enhancing the overall anti-corrosion performance. At the same time, through reasonable construction technology and material selection, each coating has good adhesion and compatibility, ensuring the stability and reliability of the entire coating system.

[0038] Specifically, the low surface treatment epoxy primer is Jotun's low surface treatment epoxy wear-resistant paint, model 90JOTAMASTIC 90 RAL 7035; the polyurethane topcoat is Jotun's acrylic polyurethane topcoat, model silver gray STD7304FUTURA CLASSIC STD7304, and the ultra-thin steel structure fire retardant coating is Hebei Baohang's indoor ultra-thin steel structure fire retardant coating.

[0039] In some embodiments, the step S1 uses shot blasting or sand blasting to perform rust removal operations.

[0040] It should be noted that shot blasting and rust removal use high-speed rotating impellers to project projectiles, while sand blasting uses compressed air to spray abrasives. Both can quickly remove rust, scale, old coatings and other impurities on the surface of steel structures. For large-area steel structures, shot blasting and sand blasting can complete rust removal operations in a relatively short time, greatly improving construction efficiency. Compared with manual rust removal operations, they have significant advantages and can meet the needs of large-scale projects.

[0041] In some embodiments, in step S1, a rust removal operation is performed to make the cleanliness of the surface of the steel structure reach sa2.0 / st2.0 level.

[0042] It should be noted that the SA2.0 / ST2.0 level requires that there is no visible grease, dirt, scale, rust, paint coating or other attachments on the surface of the steel structure, and only slight spots or stripes are allowed to remain. Such a surface provides a good adhesion basis for the coating, allowing the coating to fit tightly to the steel structure, enhancing the adhesion of the coating and preventing the coating from easily peeling off during use. In addition, the appropriate rust removal operation level can reduce local defects in the coating caused by impurities such as rust, such as bulges and pinholes, ensure the uniformity of the coating, and effectively improve the anti-corrosion performance and service life of the coating.

[0043] In some embodiments, step S2 should be completed within two hours after step S1 is completed.

[0044] It should be noted that after the rust removal operation on the surface of the steel structure is exposed to the air, the metal will react rapidly with the oxygen and acidic gases in the air, especially in the presence of humidity and acidic gases (such as sulfur dioxide), and an iron oxide film will be formed in a short time. This film has many adverse effects on the subsequent spraying effect, such as reducing the adhesion of the primer to the steel structure, hindering the firm adhesion of the primer, and affecting the stability and durability of the coating system; at the same time, its uneven roughness and chemical activity will lead to uneven distribution of the primer, uneven thickness, sagging or missing coating, affecting the quality and appearance; and the film may contain moisture and impurities, which will cause bubble formation after construction, increase the penetration channel of corrosive media, and weaken the protective performance of the coating. Therefore, in order to ensure the best spraying effect and coating quality, it must be filled in time within two hours.

[0045] In some embodiments, the anti-corrosion base layer of the steel structure is formed by multiple spraying, and the number of spraying is not less than 2 times, and the thickness of a single spraying is not less than 120um.

[0046] In some embodiments, the anti-corrosion surface layer of the steel structure is formed by multiple spraying, and the number of spraying is not less than 2 times, and the thickness of a single spraying is not less than 30um.

[0047] In some embodiments, the fireproof layer of the steel structure is formed by spraying multiple times, and the number of spraying times is not less than 3 times, and the thickness of a single spraying is not less than 700um.

[0048] It should be noted that for the anti-corrosion base layer, topcoat layer and fireproof layer, multiple spraying can make each layer of paint more evenly distributed, avoiding defects such as sagging and bubbles caused by excessive single spraying; the gradual accumulation of thickness each time spraying is also conducive to the paint layer to better adhere to the surface of the steel structure and enhance the bonding strength between the paint layers; in addition, this method of spraying in multiple times can accurately control the thickness of each layer to ensure that the minimum thickness requirements are met, thereby improving the anti-corrosion and fireproof properties of the steel structure and extending its service life.

[0049] In some embodiments, steps S1 to S6 are performed under the condition that the ambient humidity is less than 80%.

[0050] It should be noted that based on a comprehensive consideration of the climatic conditions in coastal areas throughout the year, in order to ensure that the environmental humidity is below 80%, the fourth quarter of the region is preferred for painting and drying operations. In other seasons, coastal areas may be affected by the marine climate, and the air humidity is high, which is not conducive to the smooth progress of painting and drying operations. For example, in summer, coastal areas are often accompanied by high temperatures and humidity. High temperatures will cause the solvents in the paint to evaporate too quickly, which may cause defects such as blistering and pinholes in the coating, while high humidity will further aggravate these problems and affect the drying speed and curing quality of the coating. In contrast, the dry climate conditions in the fourth quarter can effectively avoid these problems, improve construction efficiency and coating quality, and therefore is a more ideal construction period.

[0051] The applicant further provides the following reference specific embodiments to describe the present invention. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0052] Example 1

[0053] This embodiment provides a construction process for recasting an anti-corrosion coating on the surface of a steel structure of a domestic garbage storage pit in a coastal area, comprising the following steps:

[0054] Step S1, surface cleaning: The steel structure of the garbage pit is located at the top of the garbage pit. Before the operation, a construction platform is set up on the garbage crane, and the platform can move forward, backward, left and right with the garbage crane, without affecting the continued use of the garbage crane in an emergency. After the construction platform is built, the construction personnel use compressed air to blow and clean the surface of the steel structure until the steel structure reveals a metallic luster, and then use shot blasting, sand blasting and other rust removal operations to polish the rusted area until the surface cleanliness of the steel structure reaches sa2.0 / st2.0 level;

[0055] Step S2, base surface repair: using low surface treatment epoxy primer to fill the concave parts of the steel structure caused by rust removal operation;

[0056] Step S3, surface grinding: grinding the parts of the steel structure filled with low surface treatment epoxy primer to make the surface flatness of the filled parts consistent with that of the unfilled parts, and grinding until the surface of the clean base reaches sa2.0 / st2.0 level, and cleaning the surface to remove grinding debris;

[0057] Step S4, anti-corrosion base spraying: spray low surface treatment epoxy primer on the surface of the steel structure for the first time, with a spraying thickness of 120um, and after the primer is dry, spray low surface treatment epoxy primer again with a spraying thickness of 120um, and dry.

[0058] Step S5, anti-corrosion surface spraying: spray polyurethane topcoat on the surface of the anti-corrosion base layer with a thickness of 30um, spray polyurethane topcoat again after the topcoat is dry, spray thickness of 30um, and dry.

[0059] Step S6, spraying of fireproof layer: spraying ultra-thin steel structure fireproof coating with a thickness of 70um on the surface of the anti-corrosion surface layer; after the fireproof coating is dry, spraying the fireproof coating twice again.

[0060] The anti-corrosion coating on the surface of the steel structure of the recast coastal domestic garbage storage pit prepared by the above construction process has shown excellent performance in practical applications. After two years of use, professional testing and observation have shown that there is no coating peeling on the surface of the steel structure, nor is there any obvious sign of rust. Figure 2 This shows that the process effectively resists the erosion of harsh environmental factors such as high humidity and high salinity in coastal areas, greatly prolongs the anti-corrosion protection time, significantly improves the service life of steel structures, and provides a strong guarantee for the stable operation of infrastructure in coastal areas.

[0061] In summary, the solution of the present invention has the following beneficial effects:

[0062] (I) The anti-corrosion coating on the surface of the steel structure of the recast coastal domestic garbage storage pit prepared by the present invention has demonstrated excellent corrosion resistance in practical applications: after two years of use, professional testing and observation have shown that the coating on the surface of the steel structure has no signs of peeling and obvious rust.

[0063] (ii) Simple construction process: Compared with the multiple complex pretreatment procedures and multi-layer paint painting process used in current heavy anti-corrosion construction, this technology has the remarkable characteristic of simple steps. After the surface cleaning of the steel structure is completed, the sunken parts can be directly filled, and then the primer, topcoat and fire retardant paint are sprayed in sequence. This process reduces the cumbersome construction links, which can not only effectively improve the construction efficiency, but also reduce the risk of errors in the construction process, making the entire construction operation process easier to control and implement, and greatly simplifying the overall construction process while ensuring the construction quality.

[0064] (III) The requirements for base surface treatment are relatively loose: This technology does not have strict requirements for base surface treatment. It uses low surface treatment epoxy primer and can tolerate surface conditions up to SA2.0 / ST2.0. In actual steel structure repair scenarios, the surface conditions of steel structures are often more complicated, with corroded areas that are difficult to remove rust and remnants of old coatings. Traditional processes have high standards for surface treatment, which is not only time-consuming and labor-intensive, but also poses the risk of over-treatment. The primer used in this technology can still achieve good adhesion under the relatively low-level surface conditions mentioned above. According to actual application verification, the coating has been put into use for two years, and no coating peeling has occurred during this period. This actual performance further demonstrates the advantages of this technology in coating adhesion stability, and provides strong practical support and reliability basis for its wide application in related fields.

[0065] (IV) Close fit between process and application scenario: This application is designed closely around the characteristics of steel structures in domestic waste storage pits in coastal areas, and has strong operability and practicality. The environmental conditions in coastal areas are relatively harsh. High humidity, high salinity, and corrosive gases generated by garbage have serious corrosive effects on steel structures. This technology is based on a low-surface-treated epoxy primer with excellent corrosion resistance. It can effectively resist the erosion of humid salt spray and provide reliable protection for steel structures. While fully considering the construction characteristics, this technology simplifies the process to adapt to these actual conditions in view of practical factors such as limited space in garbage storage pits, tight construction time, and high environmental protection requirements.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas, characterized in that: The following steps are involved: Step S1, surface cleaning: performing soot blowing and rust removal operations on the surface of the steel structure until the surface of the steel structure reveals a metallic luster; Step S2, base surface repair: using low surface treatment epoxy primer to fill the concave parts of the steel structure caused by rust removal operation; Step S3, surface grinding: grinding the portion of the steel structure filled with the low surface treatment epoxy primer to ensure that the surface flatness of the filled portion is consistent with that of the unfilled portion, and cleaning up debris generated by grinding; Step S4, spraying the anti-corrosion base layer: spraying a low surface treatment epoxy primer on the surface of the steel structure, and after the coating is dried, forming an anti-corrosion base layer with a thickness of not less than 240 um; Step S5, spraying the anti-corrosion surface layer: spraying a polyurethane topcoat on the surface of the anti-corrosion base layer, and after the coating is dried, forming an anti-corrosion surface layer with a thickness of not less than 60 um; Step S6, spraying of fireproof layer: spraying ultra-thin steel structure fireproof coating on the surface of the anti-corrosion surface layer, and after the coating is dried, a fireproof layer with a thickness of not less than 2100um is formed.

2. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: In the step S1, rust removal is performed by shot blasting or sand blasting.

3. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: In the step S1, rust removal is performed to make the cleanliness of the surface of the steel structure reach sa2.0 / st2.0 level.

4. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: The step S2 should be completed within two hours after the step S1 is completed.

5. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: In the step S4, the anti-corrosion base layer is formed by spraying multiple times, and the number of spraying times is not less than 2 times, and the thickness of a single spraying is not less than 120 um.

6. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: In the step S5, the anti-corrosion surface layer is formed by spraying multiple times, and the number of spraying times is not less than 2 times, and the thickness of a single spraying is not less than 30 um.

7. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: In the step S6, the fireproof layer is formed by spraying multiple times, and the number of spraying times is not less than 3 times, and the thickness of a single spraying is not less than 700um.

8. The construction process for recasting the anti-corrosion coating on the surface of the steel structure of the domestic garbage storage pit in coastal areas according to claim 1 is characterized in that: The steps S1 to S6 are performed under the condition that the ambient humidity is less than 80%.

9. A corrosion-resistant coating on the surface of a steel structure for a domestic garbage storage pit in a coastal area, characterized in that: Prepared by the construction process described in any one of claims 1 to 8, the surface anti-corrosion coating includes a base surface repair layer, an anti-corrosion base layer, an anti-corrosion surface layer, and a fireproof layer.

10. An application of the anti-corrosion coating on the surface of the steel structure of the recast coastal domestic garbage storage pit as claimed in claim 9, characterized in that: A base repair layer, an anti-corrosion base layer, an anti-corrosion surface layer and a fireproof layer are formed in sequence on the surface of the steel structure, which is used for the anti-corrosion of steel structures in coastal areas.

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