Surface treatment process of corrosion-resistant steel member

Abstract

The invention discloses a lubricating process of a surface treatment process of a corrosion-resistant steel member, which comprises the following steps: S1, rust removal: carrying out first rust removal on the steel member by adopting a chemical mode, and then carrying out second rust removal on the steel member by adopting a mechanical mode; s2, oil removal: removing non-saponified oil stains by using an organic solvent, and removing saponified animal and vegetable oil by using an alkaline solvent; s3, phosphate is adopted for phosphating treatment, and a microporous structure layer is formed; s4, spraying is conducted on the steel component, and a metal coating is formed; s5, spraying an organic sealing layer on the metal coating; s6, drying: drying by adopting a dryer or a natural air-drying mode; and S7, sealing pores by using a silane impregnant to form a hydrophobic protection layer. Compared with the prior art, the problems that the protection effect is poor, severe environments cannot be handled and the service life is short due to the fact that anti-corrosion paint is mostly coated on the surfaces of the steel components for protection in existing steel component anti-corrosion treatment can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel components, in particular to a surface treatment process of a corrosion-resistant steel component. Background Art

[0002] Steel components refer to composite steel structures constructed from steel plates, angle steel, channel steel, I-beams, and welded or hot-rolled H-beams, cold-bent or welded, connected by connectors. These components are capable of bearing and transmitting loads. Steel component systems offer advantages such as light weight, factory-fabricated manufacturing, rapid installation, short construction periods, excellent seismic performance, rapid investment returns, and minimal environmental pollution. Compared to reinforced concrete structures, they possess unique advantages in terms of height, size, and lightness. Globally, steel components are widely and rationally used in construction. However, practice has shown that greater applied forces increase the deformation of steel components. However, excessive applied forces can lead to fracture or severe, significant plastic deformation, compromising the proper functioning of the structure. To ensure the proper functioning of engineering materials and structures under load, each steel component must possess sufficient load-bearing capacity, also known as bearing capacity. Bearing capacity is primarily determined by the strength, stiffness, and stability of the steel component.

[0003] The corrosion of steel structures is closely related to the atmospheric environment in which they are located. Ambient air humidity, temperature, and atmospheric pollutants have a particularly significant impact on steel corrosion. Existing corrosion protection methods for building steel structures generally involve coating the surface with anti-corrosion paint. However, this protection is ineffective and cannot withstand harsh environments. Furthermore, the paint has a short service life. Summary of the Invention

[0004] The purpose of the present invention is to provide a surface treatment process for corrosion-resistant steel components in order to solve the problems that the existing anti-corrosion treatment of steel components mostly adopts the method of coating the surface of the steel components with anti-corrosion paint for protection, which has poor protection effect, cannot cope with harsh environments and has a short service life.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a surface treatment process for corrosion-resistant steel components, comprising the following steps:

[0006] S1: Rust removal, the steel components are first rusted by chemical means, and then the steel components are secondly rusted by mechanical means;

[0007] S2: Degreasing, using organic solvents to remove non-saponifiable oils and alkaline solvents to remove saponified animal and vegetable oils;

[0008] S3: Phosphate treatment is performed using phosphate to form a microporous structure layer;

[0009] S4: spraying the steel components to form a metal coating;

[0010] S5: spraying an organic sealing layer on the metal coating;

[0011] S6: Drying, using a dryer or natural air drying;

[0012] S7: Use silane impregnation agent to seal the pores and form a hydrophobic protective layer.

[0013] As a further description of the above technical solution:

[0014] The chemical method is treatment with sulfuric acid or hydrochloric acid solution.

[0015] As a further description of the above technical solution:

[0016] The mechanical method is to use quartz sand or iron sand injection.

[0017] As a further description of the above technical solution:

[0018] The organic solvent for cleaning is one of gasoline or acetone, and the alkaline solvent is NaOH or Na3P04.

[0019] As a further description of the above technical solution:

[0020] Step S4 adopts a thermal spraying process, which uses arc spraying equipment, the diameter of the zinc or aluminum wire used is 2-3mm, the spraying voltage is 28-32V, the current is 200-250A, the spraying distance is controlled to be 150-200mm, the spray gun movement speed is 0.5-1.0m / s, and the coating thickness reaches 100-150μm.

[0021] As a further description of the above technical solution:

[0022] Step S4 adopts a cold spraying process, the zinc powder particle size used is 15-45 μm, and the compressed air pressure is 0.6-1.0 MPa.

[0023] As a further description of the above technical solution:

[0024] The cold spraying process is carried out in two steps with an interval of 30 minutes, and the total thickness is 80-120 μm.

[0025] As a further description of the above technical solution:

[0026] Step S5 uses high-pressure airless spraying equipment with a nozzle diameter of 0.43-0.53 mm and a pressure of 12-15 MPa.

[0027] As a further description of the above technical solution:

[0028] The spraying is performed multiple times using high-pressure airless spraying equipment.

[0029] In summary, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the present invention first uses chemical methods for rust removal, which can improve the quality of rust removal. When using mechanical rust removal, the roughness of the surface of the steel component can be increased while removing the rust, thereby increasing the adhesion effect of the metal coating. At the same time, phosphate is used for phosphating treatment to form a microporous structure layer, which improves the adhesion of the coating. The metal coating and the organic closed composite layer are used for corrosion protection, which can improve the corrosion resistance life of the composite coating, thereby increasing the service life of the steel component. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 The figure is a flow chart of a surface treatment process for corrosion-resistant steel components. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] Example 1

[0034] See also Figure 1 The present invention provides a technical solution: a surface treatment process for corrosion-resistant steel components, comprising:

[0035] S1: Rust removal, the steel components are first rusted by chemical means, and then the steel components are secondly rusted by mechanical means;

[0036] S2: Degreasing, using organic solvents to remove non-saponifiable oils and alkaline solvents to remove saponified animal and vegetable oils;

[0037] S3: Phosphate treatment is performed using phosphate to form a microporous structure layer;

[0038] S4: spraying the steel components to form a metal coating;

[0039] S5: spraying an organic sealing layer on the metal coating;

[0040] S6: Drying, using a dryer or natural air drying;

[0041] S7: Use a silane impregnation agent to seal pores and form a hydrophobic protective layer. The silane impregnation agent concentration is 5%, and the impregnation time is 3-5 minutes. 46. A hydrophobic protective layer with a thickness of 0.5-1.0 μm is formed, which can improve rust resistance.

[0042] The chemical method is to use sulfuric acid or hydrochloric acid solution for treatment. Specifically, the concentration of sulfuric acid is 15-20% and the treatment time is 20-40 minutes.

[0043] The mechanical method is to use quartz sand or iron sand blasting to make the surface of the steel component reach Sa2.5 cleanliness level.

[0044] The organic solvent for cleaning is one of gasoline or acetone, and the alkaline solvent is NaOH or Na3P04.

[0045] Step S4 adopts a thermal spraying process, which uses arc spraying equipment, the diameter of the zinc or aluminum wire used is 2-3mm, the spraying voltage is 28-32V, the current is 200-250A, the spraying distance is controlled to be 150-200mm, the spray gun movement speed is 0.5-1.0m / s, and the coating thickness reaches 100-150μm.

[0046] Step S4 adopts a cold spraying process, the zinc powder particle size used is 15-45 μm, and the compressed air pressure is 0.6-1.0 MPa.

[0047] The cold spraying process is carried out in two steps with an interval of 30 minutes, and the total thickness is 80-120 μm.

[0048] Step S5 uses high-pressure airless spraying equipment with a nozzle diameter of 0.43-0.53 mm and a pressure of 12-15 MPa.

[0049] The high-pressure airless spray equipment is used for multiple spraying. Specifically, the coating used by the high-pressure airless spray equipment includes epoxy sealer and thinner, which are mixed in a weight ratio of 4:1. The epoxy sealer and thinner are stirred for ≥5 minutes until no precipitation occurs. The viscosity is adjusted to 25-35 seconds for coating 4 cups. Airless spraying is suitable, and the wet film thickness is controlled to 80-100 μm. The dry film thickness of a single coat is 40-50 μm. The second coat is sprayed after the first coat is dry, and the total dry film thickness is greater than 80 μm.

[0050] Comparative Example 1

[0051] The difference between Comparative Example 1 and Example 1 is that step S5 is missing, and the other steps are the same.

[0052] Comparative Example 2

[0053] The difference between Comparative Example 2 and Example 1 is that step S4 is missing, and the other steps are the same.

[0054] The steel components treated in Example 1, Comparative Example 1 and Comparative Example 2 were tested. The coating adhesion test was conducted on the steel components according to ASTM D4541, the porosity test was conducted on the steel components according to ASTM D4541, the sealing layer thickness test was conducted on the steel components according to ISO 2808, and the salt spray resistance test was conducted on the steel components according to ASTM B117.

[0055] The experimental results are as follows:

[0056]

[0057]

[0058] According to the above table, the use of metal coating and organic closed composite layer for corrosion protection can improve the coating adhesion of steel components, reduce porosity, and significantly improve corrosion resistance.

[0059] Therefore, the present invention first uses chemical methods to remove rust, which can improve the quality of rust removal. When using mechanical rust removal, the roughness of the steel component surface can be increased while removing rust, thereby increasing the adhesion effect of the metal coating. At the same time, phosphate is used for phosphating treatment to form a microporous structure layer to improve the adhesion of the coating. The metal coating and the organic closed composite layer are used for corrosion protection, which can increase the corrosion resistance life of the composite coating, thereby increasing the service life of the steel component.

[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A lubrication process for surface treatment of corrosion-resistant steel components, characterized in that: The following steps are involved: S1: Rust removal, the steel components are first rusted by chemical means, and then the steel components are secondly rusted by mechanical means; S2: Degreasing, using organic solvents to remove non-saponifiable oils and alkaline solvents to remove saponified animal and vegetable oils; S3: Phosphate treatment is performed using phosphate to form a microporous structure layer; S4: spraying the steel components to form a metal coating; S5: spraying an organic sealing layer on the metal coating; S6: Drying, using a dryer or natural air drying; S7: Use silane impregnation agent to seal the pores and form a hydrophobic protective layer.

2. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: The chemical method is treatment with sulfuric acid or hydrochloric acid solution.

3. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: The mechanical method is to use quartz sand or iron sand injection.

4. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: The organic solvent for cleaning is one of gasoline or acetone, and the alkaline solvent is NaOH or Na3P04.

5. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: Step S4 adopts a thermal spraying process, which uses arc spraying equipment, the diameter of the zinc or aluminum wire used is 2-3mm, the spraying voltage is 28-32V, the current is 200-250A, the spraying distance is controlled to be 150-200mm, the spray gun movement speed is 0.5-1.0m / s, and the coating thickness reaches 100-150μm.

6. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: Step S4 adopts a cold spraying process, the zinc powder particle size used is 15-45 μm, and the compressed air pressure is 0.6-1.0 MPa.

7. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 6, characterized in that: The cold spraying process is carried out in two steps with an interval of 30 minutes, and the total thickness is 80-120 μm.

8. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: Step S5 uses high-pressure airless spraying equipment with a nozzle diameter of 0.43-0.53 mm and a pressure of 12-15 MPa.

9. The lubrication process for surface treatment of a corrosion-resistant steel component according to claim 1, characterized in that: The spraying is performed multiple times using high-pressure airless spraying equipment.

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