Hot Dipped Galvanized Pipes

• Dual-Layer Protection: The hot dip galvanizing process forms two crucial protective layers. The inner zinc-iron alloy layer, which is firmly bonded to the steel substrate, is extremely hard and wear-resistant. It can withstand mechanical stress and chemical attacks from various substances. The outer pure zinc layer acts as a sacrificial anode. Zinc is more reactive than iron, so when exposed to a corrosive environment, the zinc corrodes preferentially, protecting the underlying steel. This dual-layer protection mechanism provides long-term corrosion resistance.

• Long Service Life: In typical indoor environments, hot dipped galvanized pipes can have a service life of over 30 years. Even in harsh outdoor conditions, such as in coastal areas with high salt content in the air or in industrial areas with polluted atmospheres, they can remain functional and corrosion-free for 15 - 25 years. This is significantly longer than ungalvanized steel pipes, which may start to show signs of rust within a few years under similar conditions.

Hot dipped galvanized pipes are manufactured by immersing steel pipes in molten zinc. A galvanized layer is formed through chemical reaction and physical adhesion between zinc and the steel surface, belonging to a "post-galvanization" process (galvanization is done after the steel pipe is formed). Their core features focus on "strong anti-corrosion and high adaptability":

Superior Anti-Corrosion Performance & Long Service Life

The galvanized layer consists of a "zinc-iron alloy layer" and a "pure zinc layer," with a thickness of over 85μm (far higher than other galvanization processes). It tightly covers the steel pipe surface, effectively isolating corrosive media such as air, moisture, acid, and alkali. In ordinary atmospheric environments, the service life can reach 20-50 years, which is 5-10 times that of bare steel pipes. Even in humid, coastal salt-spray, or mild industrial pollution environments, it can significantly delay rusting and reduce long-term maintenance costs.

Strong Adhesion of Galvanized Layer, Impact & Wear Resistance

During the hot dipped galvanization process, zinc and steel form a metallurgical bond. The resulting zinc-iron alloy layer has high hardness (HV≥250) and firm bonding with the base material, which is not easy to fall off due to collisions during handling and installation or friction during long-term use. Compared with cold galvanization (electrogalvanization), its galvanized layer has better anti-peeling performance and can adapt to outdoor, underground, and other scenarios vulnerable to external forces.

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