Introduction of anti-corrosion on the inner wall of large-diameter steel pipes

1. Before processing all steel pipes, the steel plate on the inner wall side of the large-diameter steel pipe shall be de-rusted until the metal is exposed to metallic luster (whitening). It should meet the sa2.5 standard required in GB8923-88 of “Steel Surface Corrosion Grade and Rust Removal Grade Before Painting”.

2. The steel after de-rusting should be processed immediately (to prevent secondary rusting). After the processing is completed, use a clean rag to wipe off the residual rust powder on the inner wall of the pipe (if secondary rust is found, perform secondary rust removal to ensure painting), and use GZ-2 gray new polymer in time Anti-corrosion paint (high-build type) is used as a primer twice. The top coat is painted with sky blue paint twice so that the total thickness of the paint film reaches 250-300μm.

3. The primer should be finished before the pipe fittings leave the factory, and the top coat should be painted before the pipe installation. All pipe fittings should not be painted within 200mm of both ends (installation welds) and should be painted after the pipe fittings are installed.

4. You only need to use a brush when applying the primer, and the spraying method is prohibited. The spraying method can be used for the top coat.

5. Ventilation conditions should be provided in the painting site to prevent the metal surface from getting wet, and the site should not have strong winds, dust, hot sun exposure, and other bad weather, (such as high temperature > 70 ℃, or too low < + 5 ℃ rainy days, etc.) Do not carry out painting work, it is best to paint at 10°C-25°C, with the relative humidity below 70%.

Post time: Apr-24-2023

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