Do galvanized steel pipes need anti-rust paint

After galvanizing, the surface of the steel pipe is covered with a zinc coating, which separates the steel pipe from the atmosphere, avoids the direct contact and rust of the atmosphere to the steel pipe, and is protected. Because of the strong chemical activity of zinc, a thin and dense layer of zinc carbonate will be formed in the air at room temperature to protect zinc itself from further oxidation. Therefore, galvanized pipes, whether surface zinc or steel pipe itself, are protected from rust and need not be brushed with anti-rust paint. Only when the galvanized layer is destroyed (such as steel pipe welding, joint coating burning), the steel pipe exposed to the air, lost the protection of galvanized layer, then need to brush anti-rust paint.