Disadvantages of galvanized steel pipe

DataTime:[2016-10-13]

Galvanized steel is steel that has been coated with zinc to prevent corrosion. The steel is submerged in hot, melted zinc, which triggers a chemical reaction that permanently bonds the zinc and steel together. During the galvanization process, the steel is first exposed to zinc at a temperature of approximately 860 degrees. The zinc reacts to available oxygen in the environment to form zinc oxide, which then forms zinc carbonate after reacting to carbon dioxide. Iron molecules in the steel react with the zinc, creating layers of metal that are able to withstand even long term contact with saltwater.

Benefits of galvanized steel

Because galvanized steel is coated with zinc, it offers many benefits over traditional steel or iron piping. The zinc coating drastically reduces corrosion and prevents minerals from depositing inside the pipe lines. In larger construction projects, such as sewer systems and farm irrigation, galvanized steel pipes are often the piping of choice and often remain in working order with little maintenance for 40 years or more. Galvanized steel is more flame resistant than PVC piping, and is stronger than aluminum piping. This type of metal also works well under freezing conditions.

Disadvantages of galvanized steel

In spite of its many benefits, there are some advantages of galvanized steel pipe. When mixed with yellow brass, galvanized steel triggers dezincification, and it results in electrolytic action when combined with nonferrous metals, such as copper and brass. Galvanized steel should never be used underground unless properly covered, which can be inconvenient for many jobs, and it often hides significant defects beneath the zinc coating on the steel. Galvanized steel pipes may contain lead, which corrodes quickly and reduces the lifespan of the piping. Moreover, galvanized steel may leave rough patches inside pipes, resulting in serious failures and stoppages that can be expensive to repair. Because of these issues, most modern homes use copper piping as an alternative.

There are several such common defects and disadvantages of galvanized steel pipe:

1. gray zinc coating is the result of a mixture of iron and zinc alloy which caused;

2. galvanized steel surface to form a thick edge, which means that the edges of the zinc layer thicker than the middle part, it becomes a thick edge defects and not conducive to strip coiling. Thick edge is divided into high-speed and low-speed thick edge thick edge to form a thick edge is because the gas knife galvanized angle adjustment caused by poor air blowing, the formation of turbulence generated by appropriately adjusting the intensity air knife can be excluded this defect.

3. If clogging air knife gap will form an air knife marks, require a special cleaning tool to clean up.

4. galvanized steel zinc tablets appearing on the surface, that is, those that are not polished rough small particles, such small particles not only affect the appearance but also affect use. Formation of such particles is because too much zinc production by machines churning bottom ash floated adhere galvanized sheet surface temperature is too high there is so because the production of bottom ash float, in addition, zinc solution high aluminum, aluminum and zinc that have a good affinity, and thus together, adhere to the surface of galvanized sheet.

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