Q:Are there any hidden dangers associated with using thin-coated zinc pipes. what is the acceptable thickness for a galvanized layer on steel pipes?

Using thin-coated zinc pipes does indeed pose potential risks, primarily poor corrosion resistance and a short service life.

The thin zinc layer cannot provide sufficient "sacrificial anode" protection, making it easily penetrated in corrosive environments, leading to pipe rust. It also results in poor corrosion resistance and susceptibility to rust.
The weak bond between the thin zinc layer and the steel pipe substrate makes it prone to peeling during transportation, installation, or use, exposing the pipe directly to air and accelerating corrosion.

The acceptable thickness standard depends primarily on the galvanizing process and the pipe wall thickness.
For national standard galvanized pipes used in building fire protection, outdoor steel structures, and greenhouses, the average zinc layer thickness should be no less than 85μm, with a zinc layer weight ≥650g per square meter. For buried water supply and drainage pipes used in long-term damp underground applications, the zinc layer thickness needs to reach at least 100μm to improve resistance to soil corrosion.

The zinc layer thickness should be selected based on the actual application; do not choose products with substandard galvanized layers simply to reduce costs.

Time：09/07/2026 16:14:13