Operating Procedures and Requirements for Epoxy Anti-Rust and Anti-Corrosion Primer and Fluorocarbon Topcoat

Article 1: Steel Structure and Anti-corrosion Pipeline Construction Process

1.1 Anti-corrosion spray coating of steel structures shall be carried out by a professional construction team that has received training and is qualified. Safety technology and labor protection requirements during construction shall be implemented in accordance with relevant national regulations.

1.2 When the steel structure or pipeline is installed in place, and the connecting hangers, walkways, pipe racks, and other related components are installed and accepted, fluorocarbon topcoat can then be constructed.

1.3 Before construction, the surface of the steel structure or pipeline shall be derusted, and rust prevention treatment shall be determined according to the requirements of use. Derusting and rust prevention treatment shall comply with the relevant provisions of the current "Code for Construction and Acceptance of Steel Structure Engineering".

1.4 Debris on the surface of the steel structure shall be cleaned, and gaps at the joints shall be filled and leveled with anti-corrosion paint or other anti-corrosion materials before construction. construction anti-corrosion paint shall be carried out before interior decoration and under conditions where it will not be damaged by subsequent projects. During construction, parts and other objects that do not require anti-corrosion protection shall be shielded and protected. The newly constructed coating shall be protected from dirt and mechanical impact.

1.5 During construction and before the coating dries and cures, the temperature should be maintained at 5～38℃, and the relative humidity should not exceed 90%. The air should be circulated. Work should not be carried out when the wind speed is greater than 5m/s, or in rainy weather and when there is condensation on the surface of the components. Quality Requirements

1.6 For two-component paints, they should be mixed on site according to the instructions; two-component paints should also be thoroughly mixed. After spraying or brushing, there should be no dripping or sagging.

1.7 Construction professionals to ensure construction quality, film thickness, and film effect.

1.8 All use of our company's matching products.

1.9 Before construction, the paint should be thoroughly mixed, and then curing agent, thinner

mix according to the ratio, mix thoroughly,

can be constructed.  

Article 2: Primer Coating Construction Process:

2.1 Construction can only be carried out when the surface derusting and rust prevention treatment of the steel substrate meet the requirements, and dust and other debris are cleaned. [Paint 5 kg: curing agent 1 kg: thinner 1 kg] approximate ratio, specific ratio should be determined according to the coating thickness and construction design requirements ，2.3 The bottom layer is generally painted 1～2 coats, the spraying thickness of each coat must reach 60-8 0 μ m above After the previous coat is dry or cured, spray the next coat. The spraying protection method, number of spraying coats, and coating thickness should be determined according to the construction design requirements.  

2.4 Ensure that the coating is completely closed during spraying,   

2.5 Bottom layer is generally painted 2 times, and should completely cover the bottom layer. Paint total usage is 0.2 ～ 0.4 kg/㎡.

2.6 Operators should use a thickness gauge to check the coating thickness and ensure that the spraying reaches the design thickness.  

2.7 When the design requires the coating surface to be smooth and flat, the last coat should be smoothed to ensure that the outer surface is uniform and flat.  

Article 3 , Topcoat Construction Process:

Article 4 、 Primer brush 1-2 times, topcoat brush 1 time, total thickness 18 0 microns, the amount is about 0.2-0.4 kg/square for the bottom two coats, and about 0.1-0.3 kg/square for the top coat

3.1 Topcoat application ratio: [Paint 5 kg: curing agent 1 kg: thinner 1 kg] approximate ratio, specific ratio should be determined according to the coating thickness and construction design requirements.  

3.2 When the bottom layer thickness meets the design requirements and is basically dry, the surface layer can be constructed.  

3.3 Surface layer is generally painted once, and should completely cover the bottom layer. Paint total usage is 0.1 ～ 0.3 kg/㎡.

3.4 The surface layer should be uniform in color and the joints should be flat.

3.5 Spraying or brushing should be completed in multiple coats, and the thickness of each coat should be 60-80 μ m ，The next coat must be sprayed after the previous coat is basically dry or cured. The spraying protection method, number of spraying coats, and coating thickness should be determined according to the construction design requirements.  

3.6 The total thickness of the bottom surface of the coating is about 180μm, and the total paint consumption is: 0.3-0.5kg/㎡.

3.7 During construction, the operator should use a thickness gauge to check the coating thickness until it meets the design requirements before stopping spraying. The sprayed coating should be uniform and flat.  

3.7 The anti-corrosion coating should be resprayed if any of the following conditions occur:  

3.7 1. The coating is not well dried and cured, and is not firmly bonded or is powdery, hollow, or peeled.

3.7 2. There is obvious indentation in the coating at the joints or corners of the steel structure or pipe.

3.7 3. There is floating slurry on the coating surface or the crack width is greater than 1.0 mm.

3.7 4. The coating thickness is less than 85% of the design thickness, or the coating thickness is greater than 85% of the design thickness.

Article 4: Finished Product Protection 4. 1. After painting, steel components or pipes should be temporarily enclosed and isolated to prevent trampling and damage to the coating. 4.2 After painting steel components, if there is strong wind or rain within 4 hours, they should be covered to prevent contamination by dust and moisture, affecting the adhesion of the coating. 4.3 When transporting painted steel components or pipes, care should be taken to prevent collisions, dragging on the ground, and damage to the coating.

Article 5: Quality Issues to Note 5.1 The coating operation temperature should preferably be between 5～38℃. When the ambient temperature is below 5℃, appropriate low-temperature coating materials should be used. 5.2 When the temperature is higher than 40℃, coating work should be stopped. Because when the component temperature exceeds 40℃, painting on the steel surface will produce bubbles, reducing the adhesion of the paint film. 5.3 When the air humidity is greater than 85%, or there is condensation on the surface of the component, coating work should not be carried out. 5.4 Before the fabrication of steel components, rust removal should be carried out in advance for hidden parts and parts with difficult rust removal in structural layers, and painting should be carried out in advance.

  Article 6: Coating Inspection and Acceptance: 6.1 During and after surface coating construction, the coated workpieces should be protected to prevent flying dust and other debris. 6.2 The inspection of the post-coating treatment should be that the coating color is consistent, the color is bright and shiny, without wrinkles,

and no lumps. 6.3 For the determination of the paint film thickness, a contact-type paint film thickness gauge is used to determine the paint film thickness. The paint film thickness gauge generally measures the thickness at 3 points, and the average value is taken.

Article 7: Quality Standards: 7.1 Rust removal of the steel surface before painting should meet the design requirements and the provisions of the current national relevant standards. The chemically derusted steel surface should show the metallic luster. The treated steel surface should be free of welding slag, welding scars, dust, oil, water, and burrs, etc. Inspection method: Inspect with a scraper and visually inspect by comparing with the pictures specified in the current national standard "Rust Grade and Rust Removal Grade of Steel Surface Before Painting". 7.2 No mispainting or omission of painting is allowed, and the coating should be free of peeling and rusting. 7.3 Inspection method: Visual inspection. 7.3.1 Basic items should meet the following regulations: 7.3.2 Appearance quality of painting project: Qualified: Brushing should be uniform, without obvious wrinkles, bubbles, and good adhesion. Excellent: Brushing should be uniform, color consistent, no wrinkles, sagging, or bubbles, good adhesion, and clear and neat color lines. 7.4 Inspection

7.4.1 Quality of component touch-up paint: Qualified: The touch-up paint film should be complete.

Excellent: Layer-by-layer touch-up according to the painting process, the paint film is complete, and the adhesion is good. Inspection quantity: Randomly check 10% of each type of component,

but not less than 3 pieces. Inspection method: Visual inspection. 7.4.2 The allowable deviation items and inspection methods for the dry paint film thickness of the painting project should comply with the provisions of Table 5-26. The required dry paint film thickness and allowable deviation values should comply with the provisions of "Construction and Acceptance Code for Steel Structure Engineering". Inspection quantity: Randomly check 10% of the same type of components, but not less than 3 pieces, measuring 5 points for each point, and the value of each point is the average value of the dry paint film thickness of 3 measuring points approximately 50 mm apart. Table of Allowable Deviation Items and Inspection Methods for Dry Paint Film Thickness 5-26