The galvanized steel pipe will actually rust, but the zinc coating is oxidized first to protect the steel pipe from rust and has a longer service life. Under natural conditions, the chromium coating will not react with oxygen, carbon dioxide and water in the air, and will not be corroded by weak acid and weak alkali. Of course, the anti rust effect is better. If the zinc coating is thick enough, it will not rust in theory, because the surface of the steel pipe is wrapped by a layer of metal zinc, which separates the metal zinc from the air, so the steel pipe will not rust. This issue is controversial. Let's take a look at the answer from the galvanized steel pipe manufacturer.
Will galvanized square pipe rust?
First of all, it's only a matter of time. Because galvanized steel pipe has zinc coating, it is better than ordinary welded steel pipe. It also has good strength and toughness. Its surface is glossy, which makes it more widely used, including greenhouse building, wire casing, water and gas transmission, etc. the service life of galvanized steel pipe depends on its application field.
As for whether hot-dip galvanized steel pipes will rust, the small version tells you that they will rust, even stainless steel will rust, but it is only a matter of time. This is also related to the installation environment. In the humid and rainy environment for a long time, slow galvanized steel pipe will be oxidized, spotted, corroded and rusted. If you want a long service life, try to keep it dry and choose indoor construction as much as possible. The service life is about 5-10 years or longer (excluding some inferior products on the market).
Does galvanized steel pipe need antirust paint?
After galvanizing, the steel pipe surface is covered with a layer of zinc coating, which separates the steel pipe from the atmosphere, avoids direct air contact and rust, and is protected. Due to the strong chemical activity of zinc, a thin and dense zinc carbonate layer will be formed in the air at room temperature to prevent further oxidation of zinc itself.
Therefore, the galvanized pipe, whether it is the surface galvanized pipe or the steel pipe itself, should be antirust, do not need to brush antirust paint. Only when the zinc coating is damaged (such as steel pipe welding, joint coating burning), the steel pipe will be exposed to the air and lose the protection of zinc coating. At this time, it is necessary to repair the antirust paint.
The galvanized layer of galvanized steel pipe has the function of rust prevention. The general installation method is threaded connection, and it is generally unnecessary to brush antirust paint. Unless welding and other unconventional process connection are used, the damaged parts of galvanized layer need to be painted with antirust paint. D coating. It depends on how you galvanize. If you only have welds, you have to paint. If you have internal and external galvanizing, you cannot use it.
As for whether galvanized steel pipe will rust, I believe it is obvious that galvanized steel pipe will also rust, but there are several factors that make galvanized steel pipe have a longer service life than ordinary welded steel pipe. The application field of galvanized steel pipe and zinc coating is the main reason for prolonging the service life of galvanized steel pipe.
