Can galvanized steel pipes rust?

Galvanized steel is only galvanized steel on its surface, coated with a zinc layer to provide a large amount of corrosion protection. Steel pipes made of galvanized steel resist corrosion, withstand harsh weather and are stronger and lighter than many other pipes. One question: Will galvanized steel pipes rust? To understand this, we should understand their manufacturing and rust prevention principles.



According to the manufacturing method, the galvanized pipe can be classified into a hot dip galvanized pipe and an electric dip pipe. Hot dip galvanizing is produced by immersing ordinary steel in a molten zinc bath. However, for electrogalvanizing, the steel is immersed in a zinc-containing electrolyte and electrolyzed to produce a corrosion-resistant coating.



Zinc plating is the process of applying zinc to steel. The zinc coating typically melts at 850 to 900 F and evaporates at 150 °F, while the steel melts at 2600 °F when molten. The zinc coating completely evaporates as the bath freezes. The thickness of the galvanized layer determines its service life. Electrolyte galvanizing is a physical reaction. The galvanized layer is attached to the surface of the pipe and is very thin and easy to rust, but hot dip galvanizing is a chemical reaction. There is a thick protective layer that is not easy to rust. After years of exposure to air and complex environments, the sacrificial corrosion properties of the zinc coating will be depleted and eventually rust.



Due to its weaker strength and lower price, galvanized steel pipes are used for the commissioning of steel structures in open environments such as HVAC equipment, agricultural greenhouse supports and chain fences.



Galvanized steel can last for about forty years until it needs to be replaced. Hard water in the home usually reduces the expected life of the galvanized pipe. In practical applications, galvanized steel pipes can be primed with most two-component epoxy or silicone epoxy resins for optimum corrosion protection or aesthetics, waterborne acrylic resins.
 

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