Anticorrosion treatment process for transformer oil tank

Abstract

The invention discloses an anti-corrosion treatment process for a transformer oil tank. The anti-corrosion treatment process comprises the following steps that S1, the surface of the oil tank is pretreated; step S2, coating a primer; s3, intermediate paint is coated; step S4, coating a finishing coat; and S5, coating post-treatment is carried out. By selecting high-performance anti-corrosion paint and a reasonable coating process, the anti-corrosion performance of the surface of the transformer oil tank is remarkably improved, erosion of various corrosion factors can be resisted for a long time, and the anti-corrosion performance is excellent; an air spraying method is adopted, so that uniform distribution of a coating on the surface of the transformer oil tank is ensured, and the problem that the anti-corrosion effect is reduced due to non-uniform coating is avoided; through surface pretreatment and selection of a high-adhesive-force coating, the binding force of the coating and a transformer oil tank base material is enhanced, and the durability and reliability of the coating are improved; the process adopts a mechanical coating method, so that the construction efficiency is improved, the labor intensity is reduced, and the construction efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-corrosion treatment of transformer oil tanks, and specifically relates to an anti-corrosion treatment process for transformer oil tanks. Background Art

[0002] The transformer oil tank is an important part of the transformer, and its anti-corrosion performance directly affects the service life and safety reliability of the transformer. In practical applications, the transformer oil tank is usually exposed to complex environments, such as high humidity, high salt spray, high temperature, etc. These environmental conditions are likely to cause corrosion on the surface of the oil tank, thereby affecting the normal operation of the transformer. Traditional anti-corrosion treatment methods usually adopt simple painting or coating processes, but these methods have problems such as poor coating adhesion, insufficient corrosion resistance, and easy peeling. Therefore, it is of great practical significance to develop an efficient and reliable anti-corrosion treatment process for transformer oil tanks.

[0003] Based on this, an anti-corrosion treatment process for transformer oil tanks is designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an anti-corrosion treatment process for transformer oil tanks, effectively solving the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: An anti-corrosion treatment process for transformer oil tanks, comprising the following steps:

[0006] Step S1, pretreatment of the oil tank surface

[0007] S1.1, rust removal treatment: Thoroughly remove rust from the surface of the oil tank, using either sandblasting rust removal or pickling rust removal method;

[0008] S1.2, degreasing treatment: Use one of the methods of organic solvent degreasing, alkaline solution degreasing or cleaner degreasing to remove the oil stain on the surface of the oil tank;

[0009] S1.3, surface roughening treatment: Through sandblasting treatment, make the surface of the oil tank reach a certain roughness, with the roughness Rz being 40 - 75 μm, to enhance the bonding force between the coating and the substrate;

[0010] Step S2, coating the primer

[0011] S2.1, primer selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0012] S2.2 Coating conditions: The coating environment temperature is above 5°C and the relative humidity is below 75%; The air spraying method is adopted. During air spraying, the air pressure is 0.4 - 0.6 MPa, the nozzle diameter is 1.5 mm, the vertical distance between the spray gun and the workpiece is 150 - 250 mm, and the gun travel speed is 0.3 - 0.5 m / s; The dry film thickness of the primer is 55 - 65 μm;

[0013] Step S3: Coating the intermediate paint

[0014] S3.1 Intermediate paint selection: Epoxy micaceous iron oxide intermediate paint is selected as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0015] S3.2 Coating conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the dry film thickness of the intermediate paint is 70 - 80 μm;

[0016] Step S4: Coating the topcoat

[0017] S4.1 Topcoat selection: Acrylic polyurethane topcoat is selected as the topcoat, which has excellent anti-corrosion property, appearance decoration property and weather resistance;

[0018] S4.2 Coating conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the dry film thickness of the topcoat is 85 - 95 μm;

[0019] Step S5: Post-treatment after coating

[0020] S5.1 Air drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface dry state;

[0021] S5.2 Baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti-corrosion performance of the coating;

[0022] S5.3 Inspection: Inspect the appearance quality, film thickness and film dryness of the surface of the fuel tank after coating to ensure that the coating quality meets the requirements.

[0023] Preferably, for the S1.‌1 rust removal treatment, when sandblasting rust removal is adopted, steel shots with a particle size of 2.5 - 1 mm are used, the shot blasting pressure is 0.18 - 0.22 MPa, the distance between the nozzle and the workpiece surface is between 200 - 500 mm, and the spraying angle is 45 - 80°;

[0024] When pickling rust removal is adopted, one of sulfuric acid or hydrochloric acid solutions is used. Among them, the mass fraction of sulfuric acid is 15% - 20%, the mass fraction of hydrochloric acid is 15% - 20%, the pickling temperature is 50 - 70°C, and the pickling time is 10 - 30 minutes.

[0025] Preferably, for the S1.2 degreasing treatment, when using an organic solvent for degreasing, use one of gasoline, kerosene, and turpentine solvents, and dip a brush or rag in the solvent to scrub the surface of the workpiece.

[0026] When using an alkaline solution for degreasing, use one of sodium hydroxide or sodium carbonate solutions, with the solution concentration being 5%-10%, the degreasing temperature being 50-70°C, and the degreasing time being 5-15 minutes.

[0027] Preferably, for the S5.1 air drying, control the room temperature at 25-30°C, and the air drying time is 24-30 hours.

[0028] Preferably, for the S5.2 baking, the baking temperature is 60-70°C, and the baking time is 2-2.5 hours.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] By selecting high-performance anti-corrosion coatings and a reasonable painting process, the present invention significantly improves the anti-corrosion performance of the surface of the transformer oil tank, can resist the erosion of various corrosion factors for a long time, and has excellent anti-corrosion performance.

[0031] Adopting the air spraying method ensures the uniform distribution of the coating on the surface of the transformer oil tank, and avoids the problem of reduced anti-corrosion effect caused by uneven painting.

[0032] Through surface pretreatment and the selection of coatings with high adhesion, the bonding force between the coating and the substrate of the transformer oil tank is enhanced, and the durability and reliability of the coating are improved.

[0033] This process adopts a mechanized painting method, which improves the construction efficiency, reduces the labor intensity, and has high construction efficiency.

[0034] The selected coatings and solvents meet the environmental protection requirements, reduce environmental pollution, and have good environmental protection performance. Specific Embodiments

[0035] Next, in combination with specific embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] The present invention provides an anti-corrosion treatment process for a transformer oil tank, including the following steps:

[0037] Step S1, pretreatment of the surface of the oil tank

[0038] S1.1. Rust removal treatment: Thoroughly remove rust from the surface of the fuel tank, using either sandblasting rust removal or pickling rust removal method;

[0039] S1.2. Degreasing treatment: Use one of the methods of degreasing with organic solvents, degreasing with alkaline solutions, or degreasing with cleaning agents to remove the oil stains on the surface of the fuel tank;

[0040] S1.3. Surface roughening treatment: Through sandblasting treatment, make the surface of the fuel tank reach a certain roughness, with the roughness Rz being 40 - 75 μm, to enhance the bonding force between the coating and the substrate;

[0041] Step S2. Coating the primer

[0042] S2.1. Primer selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0043] S2.2. Coating conditions: The coating environment temperature is above 5°C, and the relative humidity is below 75%; Use air spraying method, when air spraying, the air pressure is 0.4 - 0.6 MPa, the nozzle diameter is 1.5 mm, the vertical distance between the spray gun and the workpiece is 150 - 250 mm, and the gun travel speed is 0.3 - 0.5 m / s; The primer film thickness is 55 - 65 μm;

[0044] Step S3. Coating the intermediate paint

[0045] S3.1. Intermediate paint selection: Select epoxy micaceous iron oxide intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0046] S3.2. Coating conditions: The coating environment conditions are the same as those of the primer, use air spraying method, and the intermediate paint film thickness is 70 - 80 μm;

[0047] Step S4. Coating the topcoat

[0048] S4.1. Topcoat selection: Select acrylic polyurethane topcoat as the topcoat, which has excellent anti-corrosion property, appearance decoration property and weather resistance;

[0049] S4.2. Coating conditions: The coating environment conditions are the same as those of the primer, use air spraying method, and the topcoat film thickness is 85 - 95 μm;

[0050] Step S5. Post - coating treatment

[0051] S5.1. Air drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface - dry state;

[0052] S5.2. Baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti - corrosion performance of the coating;

[0053] S5.3, Inspection: Inspect the appearance quality, film thickness, and film dryness of the painted fuel tank surface to ensure that the coating quality meets the requirements.

[0054] For the rust removal treatment in S1.1 of this embodiment, when using sandblasting for rust removal, steel shot with a particle size of 2.5 - 1 mm is used, the shot blasting pressure is 0.18 - 0.22 MPa, the distance from the nozzle to the workpiece surface is between 200 - 500 mm, and the spraying angle is 45 - 80°;

[0055] When using pickling for rust removal, one of sulfuric acid or hydrochloric acid solutions is used. Among them, the mass fraction of sulfuric acid is 15% - 20%, the mass fraction of hydrochloric acid is 15% - 20%, the pickling temperature is 50 - 70°C, and the pickling time is 10 - 30 minutes.

[0056] For the degreasing treatment in S1.2 of this embodiment, when using organic solvent degreasing, one of gasoline, kerosene, and turpentine solvents is used, and the workpiece surface is scrubbed with a brush or a rag dipped in the solvent;

[0057] When using alkaline solution degreasing, one of sodium hydroxide or sodium carbonate solutions is used, the solution concentration is 5% - 10%, the degreasing temperature is 50 - 70°C, and the degreasing time is 5 - 15 minutes.

[0058] For the air drying in S5.1 of this embodiment, the room temperature is controlled at 25 - 30°C, and the air drying time is 24 - 30 hours.

[0059] For the baking in S5.2 of this embodiment, the baking temperature is 60 - 70°C, and the baking time is 2 - 2.5 hours.

[0060] Example 1:

[0061] An anti-corrosion treatment process for a transformer fuel tank, comprising the following steps:

[0062] Step S1, Pre-treatment of the fuel tank surface

[0063] S1.1, Rust removal treatment: Thoroughly remove rust from the fuel tank surface, using one of sandblasting rust removal or pickling rust removal methods;

[0064] S1.2, Degreasing treatment: Use one of organic solvent degreasing, alkaline solution degreasing, or cleaner degreasing methods to remove the oil stain on the fuel tank surface;

[0065] S1.3, Surface roughening treatment: Through sandblasting treatment, make the fuel tank surface reach a certain roughness, with a roughness Rz of 40 μm, to enhance the bonding force between the coating and the substrate;

[0066] Step S2, Coating the primer

[0067] S2.1, Primer Selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0068] S2.2, Coating Conditions: The coating environment temperature is above 5°C, and the relative humidity is below 75%; The air spraying method is adopted. During air spraying, the air pressure is 0.4 MPa, the nozzle diameter is 1.5 mm, the vertical distance between the spray gun and the workpiece is 150 mm, and the gun travel speed is 0.3 m / s; The primer film thickness is 55 μm;

[0069] Step S3, Coating Intermediate Paint

[0070] S3.1, Intermediate Paint Selection: Select epoxy mica iron intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0071] S3.2, Coating Conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the intermediate paint film thickness is 70 μm;

[0072] Step S4, Coating Topcoat

[0073] S4.1, Topcoat Selection: Select acrylic polyurethane topcoat as the topcoat, which has excellent anti-corrosion property, appearance decoration property and weather resistance;

[0074] S4.2, Coating Conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the topcoat film thickness is 85 μm;

[0075] Step S5, Post-treatment after Coating

[0076] S5.1, Air Drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface-dry state;

[0077] S5.2, Baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti-corrosion performance of the coating;

[0078] S5.3, Inspection: Inspect the appearance quality, film thickness and film dryness of the surface of the fuel tank after coating to ensure that the coating quality meets the requirements.

[0079] In S1.1, Rust Removal Treatment of this embodiment, when sandblasting rust removal is adopted, steel shots with a particle size of 2.5 mm are used, the shot blasting pressure is 0.18 MPa, the distance between the nozzle and the workpiece surface is between 200 mm, and the spraying angle is 45°;

[0080] When pickling rust removal is adopted, one of sulfuric acid or hydrochloric acid solution is used. Among them, the mass fraction of sulfuric acid is 15%, the mass fraction of hydrochloric acid is 15%, the pickling temperature is 50°C, and the pickling time is 10 minutes.

[0081] In step S1.2 of this embodiment, for degreasing treatment, when using organic solvents for degreasing, one of gasoline, kerosene, and turpentine solvents is used, and a brush or rag is dipped in the solvent to scrub the surface of the workpiece.

[0082] When using an alkaline solution for degreasing, one of sodium hydroxide or sodium carbonate solutions is used, the solution concentration is 5%, the degreasing temperature is 50 °C, and the degreasing time is 5 minutes.

[0083] In step S5.1 of this embodiment, for air drying, the room temperature is controlled at 25 °C, and the air drying time is 24 hours.

[0084] In step S5.2 of this embodiment, for baking, the baking temperature is 60 °C, and the baking time is 2 hours.

[0085] Embodiment 2:

[0086] An anti-corrosion treatment process for a transformer oil tank includes the following steps:

[0087] Step S1. Pre-treatment of the oil tank surface

[0088] S1.1. Rust removal treatment: Thoroughly remove rust from the surface of the oil tank, using one of sandblasting rust removal or pickling rust removal methods;

[0089] S1.2. Degreasing treatment: Use one of organic solvent degreasing, alkaline solution degreasing, or cleaning agent degreasing methods to remove the oil stains on the surface of the oil tank;

[0090] S1.3. Surface roughening treatment: Through sandblasting treatment, make the surface of the oil tank reach a certain roughness, and the roughness Rz is 75 μm to enhance the bonding force between the coating and the substrate;

[0091] Step S2. Coating the primer

[0092] S2.1. Primer selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0093] S2.2. Coating conditions: The coating environment temperature is above 5 °C, and the relative humidity is below 75%; The air spraying method is adopted. When air spraying, the air pressure is 0.6 MPa, the nozzle diameter is 1.5 mm, the vertical distance between the spray gun and the workpiece is 250 mm, and the gun travel speed is 0.5 m / s; The primer film thickness is 65 μm;

[0094] Step S3. Coating the intermediate paint

[0095] S3.1. Intermediate paint selection: Select epoxy mica iron intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0096] S3.2, Painting Conditions: The painting environmental conditions are the same as those of the primer. The air spraying method is adopted, and the thickness of the intermediate paint film is 80 μm;

[0097] Step S4, Painting the topcoat

[0098] S4.1, Topcoat Selection: Acrylic polyurethane topcoat is selected as the topcoat. This topcoat has excellent anti-corrosion property, appearance decoration property and weather resistance;

[0099] S4.2, Painting Conditions: The painting environmental conditions are the same as those of the primer. The air spraying method is adopted, and the thickness of the topcoat film is 95 μm;

[0100] Step S5, Post-treatment after painting

[0101] S5.1, Air Drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface-dry state;

[0102] S5.2, Baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti-corrosion performance of the coating;

[0103] S5.3, Inspection: Inspect the appearance quality, paint film thickness and paint film dryness of the surface of the painted fuel tank to ensure that the coating quality meets the requirements.

[0104] In S1.1, Rust Removal Treatment of this embodiment, when sandblasting rust removal is adopted, steel shots with a particle size of 1 mm are used, the shot blasting pressure is 0.22 MPa, the distance from the nozzle to the workpiece surface is between 500 mm, and the spraying angle is 80°;

[0105] When pickling rust removal is adopted, one of sulfuric acid or hydrochloric acid solutions is used. Among them, the mass fraction of sulfuric acid is 20%, the mass fraction of hydrochloric acid is 20%, the pickling temperature is 70 °C, and the pickling time is 30 minutes.

[0106] In S1.2, Degreasing Treatment of this embodiment, when organic solvent degreasing is adopted, one of gasoline, kerosene, and turpentine solvents is used, and the surface of the workpiece is scrubbed with a brush or a rag dipped in the solvent;

[0107] When alkaline solution degreasing is adopted, one of sodium hydroxide or sodium carbonate solutions is used, the solution concentration is 10%, the degreasing temperature is 70 °C, and the degreasing time is 15 minutes.

[0108] In S5.1, Air Drying of this embodiment, the room temperature is controlled at 30 °C, and the air drying time is 30 hours.

[0109] In S5.2, Baking of this embodiment, the baking temperature is 70 °C, and the baking time is 2.5 hours.

[0110] Example 3:

[0111] An anti-corrosion treatment process for a transformer oil tank, comprising the following steps:

[0112] Step S1, pre-treatment of the oil tank surface

[0113] S1.1, rust removal treatment: Thoroughly remove rust from the oil tank surface, using one of the sandblasting rust removal or pickling rust removal methods;

[0114] S1.2, degreasing treatment: Use one of the organic solvent degreasing, alkaline solution degreasing or cleaner degreasing methods to remove the oil stains on the oil tank surface;

[0115] S1.3, surface roughening treatment: Through sandblasting treatment, make the oil tank surface reach a certain roughness, and the roughness Rz is 57μm to enhance the bonding force between the coating and the substrate;

[0116] Step S2, painting the primer

[0117] S2.1, primer selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0118] S2.2, painting conditions: The painting environment temperature is above 5°C and the relative humidity is below 75%; Use air spraying method, the air pressure during air spraying is 0.5MPa, the nozzle diameter is 1.5mm, the vertical distance between the spray gun and the workpiece is 200mm, and the gun travel speed is 0.4 m / s; The primer film thickness is 60μm;

[0119] Step S3, painting the intermediate paint

[0120] S3.1, intermediate paint selection: Select epoxy mica iron intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0121] S3.2, painting conditions: The painting environment conditions are the same as those of the primer, use air spraying method, and the intermediate paint film thickness is 75μm;

[0122] Step S4, painting the topcoat

[0123] S4.1, topcoat selection: Select acrylic polyurethane topcoat as the topcoat, which has excellent anti-corrosion property, appearance decoration and weather resistance;

[0124] S4.2, painting conditions: The painting environment conditions are the same as those of the primer, use air spraying method, and the topcoat film thickness is 90μm;

[0125] Step S5, post-treatment after painting

[0126] S5.1, air drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface dry state;

[0127] S5.2. Drying: Conduct drying treatment in a drying chamber to accelerate the complete curing of the coating, improve the hardness, adhesion and anti-corrosion performance of the coating;

[0128] S5.3. Inspection: Inspect the appearance quality, film thickness and film dryness of the surface of the painted fuel tank to ensure that the coating quality meets the requirements.

[0129] In S1.1, rust removal treatment of this embodiment, when using sandblasting for rust removal, steel shots with a particle size of 2 mm are used, the shot blasting pressure is 0.2 MPa, the distance from the nozzle to the surface of the workpiece is between 350 mm, and the spraying angle is 62°;

[0130] When using pickling for rust removal, one of sulfuric acid or hydrochloric acid solutions is used. Among them, the mass fraction of sulfuric acid is 17.5%, the mass fraction of hydrochloric acid is 17.5%, the pickling temperature is 60 °C, and the pickling time is 20 minutes.

[0131] In S1.2, degreasing treatment of this embodiment, when using organic solvent degreasing, one of gasoline, kerosene and turpentine solvents is used, and a brush or a rag is dipped in the solvent to scrub the surface of the workpiece;

[0132] When using alkaline solution degreasing, one of sodium hydroxide or sodium carbonate solutions is used, the solution concentration is 7.5%, the degreasing temperature is 60 °C, and the degreasing time is 10 minutes.

[0133] In S5.1, air drying of this embodiment, the room temperature is controlled at 27 °C, and the air drying time is 27 hours.

[0134] In S5.2, drying of this embodiment, the drying temperature is 65 °C, and the drying time is 2.3 hours.

[0135] Example 4:

[0136] An anti-corrosion treatment process for a transformer fuel tank, comprising the following steps:

[0137] Step S1. Pretreatment of the fuel tank surface

[0138] S1.1. Rust removal treatment: Thoroughly remove rust from the surface of the fuel tank, using one of sandblasting rust removal or pickling rust removal methods;

[0139] S1.2. Degreasing treatment: Use one of organic solvent degreasing, alkaline solution degreasing or cleaner degreasing methods to remove the oil stain on the surface of the fuel tank;

[0140] S1.3. Surface roughening treatment: Through sandblasting treatment, make the surface of the fuel tank reach a certain roughness, and the roughness Rz is 45 μm to enhance the bonding force between the coating and the substrate;

[0141] Step S2. Coating the primer

[0142] S2.1. Primer Selection: Select an epoxy primer as the primer, which has excellent adhesion and rust prevention ability;

[0143] S2.2. Coating Conditions: The coating environment temperature is above 5°C and the relative humidity is below 75%; The air spraying method is adopted. During air spraying, the air pressure is 0.4 MPa, the nozzle diameter is 1.5 mm, the vertical distance between the spray gun and the workpiece is 160 mm, and the gun travel speed is 0.4 m / s; The primer film thickness is 57 μm;

[0144] Step S3. Coating Intermediate Paint

[0145] S3.1. Intermediate Paint Selection: Select an epoxy mica iron intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance;

[0146] S3.2. Coating Conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the intermediate paint film thickness is 72 μm;

[0147] Step S4. Coating Topcoat

[0148] S4.1. Topcoat Selection: Select an acrylic polyurethane topcoat as the topcoat, which has excellent anti-corrosion property, appearance decoration property and weather resistance;

[0149] S4.2. Coating Conditions: The coating environment conditions are the same as those of the primer. The air spraying method is adopted, and the topcoat film thickness is 87 μm;

[0150] Step S5. Post-treatment after Coating

[0151] S5.1. Air Drying: Air dry in a clean environment to allow the coating to initially cure in the natural environment, volatilize part of the solvent, and form a surface dry state;

[0152] S5.2. Baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti-corrosion performance of the coating;

[0153] S5.3. Inspection: Inspect the appearance quality, film thickness and film dryness of the surface of the fuel tank after coating to ensure that the coating quality meets the requirements.

[0154] In S1.1. Rust Removal Treatment of this embodiment, when sandblasting rust removal is adopted, steel shots with a particle size of 1.5 mm are used, the shot blasting pressure is 0.19 MPa, the distance between the nozzle and the workpiece surface is between 250 mm, and the spraying angle is 50°;

[0155] When pickling rust removal is adopted, one of sulfuric acid or hydrochloric acid solutions is used. Among them, the mass fraction of sulfuric acid is 16%, the mass fraction of hydrochloric acid is 16%, the pickling temperature is 55°C, and the pickling time is 15 minutes.

[0156] In S1.2 of this embodiment, for degreasing treatment, when using organic solvents for degreasing, one of gasoline, kerosene, and turpentine solvents is used, and a brush or rag is dipped in the solvent to scrub the surface of the workpiece.

[0157] When using an alkaline solution for degreasing, one of sodium hydroxide or sodium carbonate solutions is used, the solution concentration is 6%, the degreasing temperature is 55°C, and the degreasing time is 8 minutes.

[0158] In S5.1 of this embodiment, for air drying, the room temperature is controlled at 26°C, and the air drying time is 26 hours.

[0159] In S5.2 of this embodiment, for drying, the drying temperature is 62°C, and the drying time is 2.2 hours.

[0160] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0161] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for anti-corrosion treatment of a transformer oil tank, characterized in that: It includes the following steps: Step S1, pretreatment of the fuel tank surface S1.1, rust removal treatment: Thoroughly remove rust from the fuel tank surface, using one of the sandblasting rust removal or pickling rust removal methods; S1.2, degreasing treatment: Use one of the organic solvent degreasing, alkaline solution degreasing or cleaning agent degreasing methods to remove the oil stain on the fuel tank surface; S1.3, surface roughening treatment: Through sandblasting treatment, make the fuel tank surface reach a certain roughness, and the roughness Rz is 40 - 75μm to enhance the bonding force between the coating and the substrate; Step S2, painting the primer S2.1, primer selection: Select epoxy primer as the primer, which has excellent adhesion and rust prevention ability; S2.2, painting conditions: The painting environment temperature is above 5℃, and the relative humidity is below 75%; Use air spraying method, when air spraying, the air pressure is 0.4 - 0.6MPa, the nozzle diameter is 1.5mm, the vertical distance from the spray gun to the workpiece is 150 - 250mm, and the gun travel speed is 0.3 - 0.5m / s; The primer film thickness is 55 - 65μm; Step S3, painting the intermediate paint S3.1, intermediate paint selection: Select epoxy micaceous iron oxide intermediate paint as the intermediate paint, which has good shielding effect and anti-corrosion performance; S3.2, painting conditions: The painting environment conditions are the same as those of the primer, use air spraying method, and the intermediate paint film thickness is 70 - 80μm; Step S4, painting the topcoat S4.1, topcoat selection: Select acrylic polyurethane topcoat as the topcoat, which has excellent anti-corrosion property, appearance decoration property and weather resistance; S4.2, painting conditions: The painting environment conditions are the same as those of the primer, use air spraying method, and the topcoat film thickness is 85 - 95μm; Step S5, post-treatment after painting S5.1, air drying: Air dry in a clean environment to let the coating initially cure in the natural environment, volatilize part of the solvent, and form a surface dry state; S5.2, baking: Conduct baking treatment in a baking room to accelerate the complete curing of the coating, and improve the hardness, adhesion and anti-corrosion performance of the coating; S5.3, inspection: Inspect the appearance quality, film thickness and film dryness of the fuel tank surface after painting to ensure that the coating quality meets the requirements.

2. The anti-corrosion treatment process of a transformer oil tank according to claim 1, characterized in that, For the said S1.1, rust removal treatment, when using sandblasting rust removal, use steel shot with a particle size of 2.5 - 1mm, the shot blasting pressure is 0.18 - 0.22MPa, the distance from the nozzle to the workpiece surface is between 200 - 500mm, and the spraying angle is 45 - 80°; When using pickling rust removal, use one of sulfuric acid or hydrochloric acid solutions, among which, the mass fraction of sulfuric acid is 15% - 20%, the mass fraction of hydrochloric acid is 15% - 20%, the pickling temperature is 50 - 70℃, and the pickling time is 10 - 30 minutes.

3. The anti-corrosion treatment process of a transformer oil tank according to claim 1, characterized in that, For the said S1.2, degreasing treatment, when using organic solvent degreasing, use one of gasoline, kerosene, turpentine solvents, and dip a brush or cloth in the solvent to scrub the workpiece surface; When using alkaline solution degreasing, use one of sodium hydroxide or sodium carbonate solutions, the solution concentration is 5% - 10%, the degreasing temperature is 50 - 70℃, and the degreasing time is 5 - 15 minutes.

4. The anti-corrosion treatment process of a transformer oil tank according to claim 1, characterized in that, S5.1, Air-dry, control the room temperature at 25 - 30°C, and the air-drying time is 24 - 30 hours.

5. The anti-corrosion treatment process of a transformer oil tank according to claim 1, characterized in that, S5.2, Dry by baking, the baking temperature is 60 - 70°C, and the baking time is 2 - 2.5 hours.