Views: 4 Author: Site Editor Publish Time: 2020-09-17 Origin: Site
1. After the steel pipe is galvanized, the surface is covered with a layer of zinc coating, which isolates the steel pipe from the atmosphere, avoids direct contact and corrosion of the steel pipe by the atmosphere, and is protected. The zinc coating on the surface of the steel pipe, due to the relatively strong chemical activity of zinc, will form a thin and dense layer of zinc carbonate in the air at room temperature to protect the zinc itself from further oxidation.
2. Therefore, the galvanized pipe, whether it is the surface zinc or the steel pipe itself, has been protected, will not rust, and does not need to be painted with anti-rust paint. Only when the galvanized layer is damaged, (such as steel pipe welding, the coating at the joint is burnt), the steel pipe is exposed to the air and loses the protection of the galvanized layer, then the anti-rust paint needs to be repainted.
3. The galvanized layer of galvanized steel pipe has anti-rust function, and the general installation method is to use threaded connection, usually no need to brush anti-rust paint, unless the unconventional process connection, such as welding, etc., needs to be damaged. Paint the part of the zinc layer with anti-rust paint.
4. It depends on the method of galvanizing. If you only plate the welding port, then you have to paint all of it. If it is galvanized inside and outside, then you don’t need it.
The galvanized square pipe introduced to you above is already galvanized, so it can play a very good protective role, mainly for normal use and maintenance. Under normal circumstances, it will not rust. In addition, for galvanized Do steel pipes need to be painted with anti-rust paint? It has an anti-rust effect, so people do not need to paint with anti-rust paint.