Post Overview

1. Galvanized pipe is a metal pipe made by coating ordinary steel pipe with a layer of zinc, typically through hot-dip galvanizing or electroplating. The zinc layer acts as a sacrificial anode, effectively preventing rust and extending the pipe's service life. Galvanized pipes are categorized into hot-dip galvanized pipes (with a thicker zinc coating of 50-60 microns for superior corrosion resistance) and electro-galvanized pipes (with a thinner coating of 10-20 microns, mostly used indoors).

2. Surface Characteristics

Smooth Zinc Layer: The surface has a dense zinc oxide film, which is smooth but has relatively poor adhesion.

Chemical Reactivity: Zinc can react with certain chemicals (e.g., acids, alkalis), potentially affecting coating stability.

Corrosion Resistance: While the zinc layer provides rust protection, prolonged exposure to moisture or salt spray may cause white rust (zinc oxide) or gradual coating failure.

3. Applications

Galvanized pipes are widely used in:

Water supply pipelines

Gas pipelines

Heating systems

Guardrails & scaffolding