What are the differences between galvanized steel pipes and plastic-coated steel pipes

First, what are the characteristics of plastic-coated steel pipes?
1. Plastic-coated steel pipes are hygienic and non-toxic, do not accumulate scale, do not breed microorganisms, and ensure fluid quality.
2. Plastic-coated steel pipes have strong flame-retardant ability; under combustion tests, the coating does not spontaneously combust or peel off.
3. The installation process of plastic-coated steel pipes is mature, convenient, and quick, and various connection methods can be used.
4. Plastic-coated steel pipes have good weather resistance and are suitable for harsh environments such as long-term static fire-fighting water supply and foam systems.
5. Plastic-coated steel pipes have smooth pipe walls, improving transportation efficiency and extending service life.
6. They are environmentally friendly; maintaining a water supply for extended periods ensures excellent water quality and does not cause environmental pollution over time.

Second, what are the differences between galvanized steel pipes and plastic-coated steel pipes?
1. Galvanized steel pipes are produced by reacting molten metal with an iron substrate to create an alloy layer, thus bonding the substrate and the coating. Hot-dip galvanizing involves first pickling the steel pipe to remove iron oxide from its surface. After pickling, the pipe is cleaned in an ammonium chloride or zinc chloride aqueous solution, or a mixed aqueous solution of both, before being immersed in the hot-dip galvanizing bath. The advantages of galvanized steel pipes include: uniform coating, strong adhesion, and long service life. However, due to profit-seeking practices, many companies now thin the zinc coating, reducing the theoretical lifespan from 7-8 years to only two or three years.
2. Plastic-coated steel pipes combine steel and plastic, suitable for pipes of any diameter. Connection methods are not limited to threaded or grooved connections (as with galvanized steel pipes), but also include welding, flange connections, bimetallic welding, etc. Plastic-coated steel pipes solve these problems. They possess the strength of steel pipes, and the inner and outer anti-corrosion coatings create smooth inner and outer walls, without reducing the flow diameter, thus improving transport efficiency. They are corrosion-resistant, have strong coating adhesion, good impact resistance, and can operate normally in harsh natural environments. It has a long service life, more than five times that of galvanized steel pipes.