Galvanized steel pipe solvent treatment process

Galvanized steel pipes undergo solvent treatment to ensure proper cleaning and preparation before the galvanization process. This treatment removes contaminants and improves the adhesion of the zinc coating. Below is an overview of the key steps and guidelines for solvent treatment of galvanized steel pipes.

Immersion in Solvent:
The steel pipe is fully immersed in the solvent tank, ensuring that the entire length of the pipe is covered. It is crucial that no part of the steel pipe is exposed to air above the solvent surface. If air bubbles form at the ends of the pipe, they should be removed. Once the pipe is immersed, it is lifted and vibrated to ensure that any excess solvent is removed. The steel pipe is then carefully transferred to the drying rack.

Pipe Tilt Angle:
During the solvent treatment, the tilt angle of the steel pipe should not exceed 15°. This ensures the solvent is applied evenly along the entire surface of the pipe.

Soaking Time:
The steel pipe should remain in the solvent for a duration of 60 to 120 seconds. For pipes that are on duty or have been previously treated, a soaking time of 3 to 5 minutes is recommended. For pipes that are intended for plating, the soaking time should be extended to 5 to 10 minutes.

Solvent Temperature:
The solvent should be kept at room temperature to maintain its effectiveness and prevent any damage to the steel pipe. It is essential to monitor the temperature to ensure the solvent remains clean and within the recommended range.

Post-Treatment Handling:
After solvent treatment, the steel pipe should be handled carefully to avoid contamination. The pipe should not be exposed to dirt or moisture. It must be placed on a drying platform in a balanced manner. If the pipe must be positioned with the ends facing up, ensure that ammonium chloride is applied to the feet of the pipe to prevent contamination before it is placed onto the drying rack.

This solvent treatment process ensures that the galvanized steel pipes are thoroughly cleaned, free from contaminants, and ready for the subsequent plating or galvanization process. Proper handling during this stage is crucial to achieving a high-quality finish and ensuring the longevity of the galvanized coating.