Requirements for factory anti-rust paint for boiler tubes

Requirements for factory anti-rust paint for boiler tubes:

Types and specifications of anti-rust paint:

The factory anti-rust paint for boiler tubes mainly includes asphalt paint, coal paint and paint. When choosing anti-rust paint, it is necessary to consider multiple factors such as the material of the boiler tube, the use environment and the maintenance period.

For example, for a harsh use environment, asphalt paint is a more suitable choice because it has strong weather resistance and corrosion resistance. Steel boiler tubes are mainly rust-proofed by resin paints such as anti-corrosion coal paint or anti-corrosion paint. These paints not only have excellent anti-corrosion properties, but also have beautiful colors and are easy to distinguish in appearance.

Paint construction standards:

When applying anti-rust paint, certain painting standards need to be followed. Specifically, before construction, the surface of the boiler tube should be wiped clean to remove harmful substances such as grease, stains and rust to ensure the adhesion of the coating.

Then, the surface of the boiler tube should be derusted, and the bad parts should be ground and repaired to ensure a smooth and flat surface to achieve a good painting effect. When painting, be sure to pay attention to the thickness and uniformity of the coating to avoid uneven coating thickness.

Specific construction steps for boiler tube coating:

1. Choose the right kind of paint
The commonly used silicone high-temperature paint on the market can withstand high temperatures of 200℃ to 1200℃, and has good heat resistance, corrosion resistance and salt spray resistance.

2. Preparation before spraying
Inspection and cleaning: Before spraying, the boiler must be thoroughly inspected to determine the parts to be sprayed and their damage. The spraying surface should be clean, dry, free of oil, dust and other impurities.
Surface treatment: The iron surface should be cleaned with a wire brush, and the non-iron surface should be frosted. After sandblasting, the surface roughness of the substrate should reach about 80 microns.

3. Spraying operation
Select spraying equipment: Select the appropriate spraying equipment according to the type of spraying material, spraying range and surface state. A handheld coating spray gun can be used for local spraying of small areas, and automated coating equipment should be used for large-area spraying.
‌Control the spraying quality‌: Before spraying, the paint should be fully stirred to adjust the viscosity and concentration of the paint. Control the spraying speed, pressure and distance to ensure uniform coating, no leakage and agglomeration. ‌

‌4. Treatment after spraying‌
‌Ventilation and drying‌: During the drying process of the coating, ventilation measures should be taken to remove toxic gases and steam, and fire prevention measures should be taken. ‌Quality inspection‌: After the coating is dried, a quality inspection should be carried out to ensure that the thickness, adhesion and anti-corrosion performance of the coating meet the requirements. ‌

Through the above steps, it can be ensured that the painting work of the boiler tube is carried out smoothly and the expected anti-corrosion and heat-resistant effects are achieved.

Quality requirements:

In order to ensure the quality and service life of boiler tubes, the quality of the anti-rust paint for boiler tubes should meet the following requirements:

1. Comply with national standards and relevant regulations to ensure the anti-rust property and adhesion strength of the coating.
2. Withstand long-term weather resistance and corrosion resistance tests, and maintain good anti-rust effects for a long time.
3. Non-toxic, odorless, environmentally friendly, and will not cause harm to the health of operators.
4. Easy to construct, easy to use, simple to operate, and will not cause trouble to construction workers.

In short, the anti-rust paint of boiler tubes is an important factor in whether the boiler tubes can operate for a long time. Therefore, when choosing anti-rust paint for boiler tubes, it is necessary to comprehensively consider the environment and use requirements of the boiler tubes, as well as the performance characteristics of various anti-rust paints, in order to select suitable paints to achieve the best anti-rust effect.

Read more: What are seamless boiler tubes and how are they made? or Carbon steel ERW boiler tube