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How to Prevent White Rust on Galvanized Steel Grating?

Time:2022-03-22

Preventing white rust on galvanized steel grating is achievable by strictly managing two stages: production and storage. By following the guidelines below, the occurrence of white rust can be effectively eliminated.

 

1. Production Phase: Surface Treatment

During manufacturing, apply surface treatments to the galvanized grating:

Chromate Passivation: Immerse the galvanized grating into a chromic acid solution. This creates a low-activity chromate film on the zinc surface. Even if the film is slightly scratched, chromates near the break will dissolve in water, gather at the damaged area, and reform a new protective layer. This effectively prevents white rust.

Oil Coating: Apply a coat of oil to prevent direct contact between the air and the zinc layer.

Note:If the grating requires painting later, the oil must be thoroughly removed beforehand.

Phosphate Treatment (For Painting): If the grating is intended for painting, apply a phosphate treatment. The phosphate coating adheres firmly to the surface, creating a loose, porous texture. This provides an excellent anchor pattern for paint, ensuring strong adhesion.

2. Storage Phase: Environmental Control

Store the produced gratings in a well-ventilated area. During seasons with high humidity or significant temperature fluctuations between day and night, use dehumidifiers or drying ovens to prevent condensation.

Avoid Moisture: Ensure the grating is not soaked or left wet. If exposed to dew or water, dry it immediately. You may unpack the bundles and use fans to blow dry the panels.

Location: Store in a well-ventilated place. Avoid locations prone to condensation caused by extreme temperature differences ("cold spots").

By implementing these measures, the formation of white rust on galvanized steel grating can be fully prevented.