7 Surface Treatment Methods of High-Pressure Boiler Tubes

The surface treatment of high-pressure boiler tubes is to improve their durability, corrosion resistance and oxidation resistance. Common surface treatment methods include the following options:

1. Galvanizing

The surface of the boiler tube is immersed in a molten zinc solution to make zinc and iron react chemically to form a zinc-iron alloy layer. This treatment method can improve the corrosion resistance of the boiler tube.

2. Hot-dip aluminum treatment

The surface of the boiler tube is immersed in a molten aluminum solution. At high temperature, aluminum and iron react to form a uniform aluminum-iron alloy layer, which improves the oxidation resistance and corrosion resistance of the boiler tube.

3. Phosphating treatment

After cleaning the surface of the boiler tube, it is immersed in a solution containing phosphate. After a period of time, a phosphate film is formed on the surface to enhance the corrosion resistance of the boiler tube.

4. Spraying treatment

By spraying a protective coating on the surface of the boiler tube, such as spraying wear-resistant coatings, corrosion-resistant coatings, etc., the wear resistance, corrosion resistance and oxidation resistance of the boiler tube are increased.

5. Electroplating treatment

Immerse the boiler tube in a solution containing metal ions such as gold, silver, and copper, and form a metal coating on the surface of the boiler tube by electrolysis to improve its corrosion resistance and decorativeness.

6. Nitriding treatment

Place the surface of the boiler tube in a nitrogen-containing environment, and undergo a nitriding reaction under high temperature and high pressure conditions to form a nitride film to improve the hardness and wear resistance of the boiler tube.

7. Heat treatment

Heat the boiler tube to a certain temperature and then cool it quickly to improve the strength and toughness of the boiler tube by changing the grain structure and organizational state of the steel.

The above are common surface treatment methods for high-pressure boiler tubes. Different surface treatment methods can be selected to improve the performance of the boiler tube according to factors such as the use environment, process requirements, and economic benefits.

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