Galvanized Plumbing Pipe
Galvanized plumbing pipe, as the name suggests, is a pipe with a layer of zinc coating on the surface. When used in water as the medium, the corrosion resistance and rust resistance of zinc can be used to protect the pipe body and extend the life of the pipe.
Why Can Galvanized Pipes be Used As Water Pipes
Zinc is an active metallic element. The moment it comes into contact with air, it forms a dense zinc film on the pipe wall, effectively isolating it from all external contact. Even if the galvanized layer is damaged, zinc will act as a “sacrificial anode” and corrode first.
The History of Galvanized Plumbing Pipe
In 1836, French engineer Stanislas Sorel invented the patented “hot-dip galvanizing” process. Galvanized pipes subsequently became widely used, not only in water supply but also in other fields.
In the mid-to-late 20th century, it was discovered that the galvanizing coating inside the pipes was flaking, causing the water inside to become yellow and turbid.
In modern times, many countries have banned the use of galvanized pipes for residential water supply.
Galvanized Plumbing Pipe Process Classification
Hot Dip Galvanized Steel Pipe For Water
Hot-dip galvanized plumbing pipe involves immersing pre-treated steel components in molten zinc (approximately 450°C). Through a physical and chemical reaction, a zinc-iron alloy layer and a pure zinc layer form on the surface. This results in a thicker zinc coating and a longer lifespan.
Cold Galvanized Steel Pipe For Water
Cold-dip galvanized plumbing pipe is an electrochemical process in which the workpiece is used as the cathode and zinc is used as the anode. Then, electricity is applied, and the current drives the zinc ions to deposit on the surface, thus forming a galvanized layer. However, the galvanized layer of the water pipe produced by this process is thinner, and its service life is much shorter than that of hot-dip galvanized pipes.
What Other Problems Can Galvanized Water Pipes Cause?
Galvanizing isn’t a permanent solution. After prolonged use, the internal zinc coating will gradually flake off, causing the pipes to rust. This can easily lead to bacterial growth in drains, causing the water to turn yellow and slowing the flow. This problem is more severe in acidic or alkaline environments. Furthermore, old galvanized pipes can release accumulated lead into the water, which can negatively impact the health of users.
Alternatives
PPR Pipe
This is the most widely used water pipe at present. The water pipe made of this material is non-toxic, corrosion-resistant, non-scaling, has good thermal insulation, is easy to install (hot-melt connection), and is reasonably priced.
Stainless steel pipe
Corrosion resistant, high strength, long life, but expensive
Copper pipe
It is corrosion-resistant, has a long lifespan and is antibacterial, but it is very expensive and requires high installation technology.
PE pipe
Commonly used for underground municipal water pipes
If you need to buy galvanized pipes or the above-mentioned stainless steel pipes, as well as all other types of pipes, you can click the button below to contact PANDAPIPE. PANDAPIPE is a company integrating production and sales. The company was established in 1998 and has a history of more than 20 years. It is a pipe company you can trust.
FAQs：
Does galvanized plumbing pipe still exist?
Galvanized pipes still exist today, but they are no longer used in the civil water diversion field. Galvanized pipes are still used in other fields such as fire sprinkler systems, building wire casings and gas pipelines.
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