Why Does Galvanized Square Tube Turn White?

Galvanized square tube typically appears red or yellow when new, but over time, its color often fades to a whitish hue. This change occurs due to the chemical composition of the galvanized square tube—specifically, its zinc coating, which reacts with oxygen in the air to form a white oxide layer. To prevent this discoloration, proper storage in a dry, well-ventilated area is essential.

How to Properly Store Galvanized Square Tube

Since zinc is an active, amphoteric metal, galvanized square tube is prone to corrosion in humid environments. Even minor corrosion can cause noticeable color changes, affecting the product's appearance. Follow these storage guidelines to maintain quality:

· Ventilation & Dry Conditions – Ensure good airflow so moisture evaporates quickly, even if the tubes are exposed to rain.

· Separate from Corrosive Materials – Do not store with acids, alkalis, salts, or cement, as these can damage the zinc coating.

· Use Covered Storage – Keep in a well-ventilated shed with protective covering (e.g., tarps) to prevent direct exposure.

· Warehouse Requirements – Choose enclosed warehouses with roofs, walls, and proper ventilation. Maintain a dry environment by ventilating on sunny days and sealing against humidity during rain.

Key Advantages of Galvanized Square Tube

The high demand for galvanized square tube stems from its unique benefits:

1. Superior Corrosion Resistance

· The hot-dip or electro-galvanized coating prevents direct contact with air, significantly reducing oxidation and enhancing durability.

2. Exceptional Strength

· Made through multiple processing stages, it offers higher strength than seamless steel pipes, making it ideal for construction and industrial applications.

3. Unique Square Shape

· Unlike traditional round pipes, its square design allows specialized uses in architecture and engineering where round pipes are unsuitable.

Conclusion

To maximize the lifespan of galvanized square tube, proper storage and handling are crucial. Its corrosion resistance, strength, and shape make it a preferred choice in various industries. For long-term performance, always store it in dry, ventilated conditions away from corrosive substances.

By understanding these factors, users can maintain the appearance and functionality of their galvanized square tubes for years.