Sharing China-Made with Global Customers
Sharing China-Made with Global Customers
Hot dipped galvanized pipe is manufactured by immersing steel pipes into molten zinc, creating a metallurgical bond between the zinc coating and the iron substrate. This process ensures superior corrosion resistance and durability.
The production of hot dipped galvanized pipe involves several critical steps:
· Acid Cleaning: Removes oxides and impurities from the steel surface.
· Flux Treatment: Prepares the pipe for zinc adhesion using ammonium chloride or zinc chloride solutions.
· Hot-Dip Galvanizing: The pipe is immersed in molten zinc (around 450°C), forming a tightly bonded zinc-iron alloy layer.
This process ensures a uniform, high-adhesion coating that is highly resistant to peeling and mechanical damage.
The hot dipped galvanized pipe features multiple protective layers:
· Pure Zinc Layer: Provides a barrier against moisture and oxygen.
· Zinc-Iron Alloy Layer: Enhances corrosion resistance through metallurgical bonding.
Compared to electroplated (cold galvanized) pipes, hot dipped galvanized pipes offer longer-lasting protection in harsh environments.
To ensure reliability, hot dipped galvanized pipes must meet strict quality criteria:
· Coating Uniformity: When tested in copper sulfate solution, the pipe should withstand 5 consecutive dips without copper plating (red discoloration).
· Surface Integrity: The coating must be free from bare spots and excessive bubbles, though minor roughness and zinc nodules are acceptable.
· Zinc Coating Weight: The average zinc coating weight must exceed 500g/m², with no single test sample below 480g/m² (as per buyer requirements).
The hot dipped galvanized pipe stands out for its durability, corrosion resistance, and strong zinc adhesion, making it ideal for construction, water supply, and industrial applications. Its superior performance ensures long-term reliability, even in demanding conditions.
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