Anti-corrosion treatment method for inner and outer walls of seamless steel pipes

Compared with traditional steel pipes, seamless pipes have lighter raw materials, higher strength, better durability, can withstand higher internal pressures, are sensitive in production and use, and can withstand chaotic or harsh geological conditions use. However, there are some disadvantages in the use process, mainly because the internal and external anti-corrosion treatment is more troublesome.

Anti-corrosion treatment method for inner and outer walls of seamless steel pipes:

The first is the problem of anti-corrosion of external walls. The quality of exterior wall anticorrosion directly affects the service life. At present, the anticorrosion of the outer wall of household steel pipes is mainly: the concealed method, which requires reinforcement or special reinforcement of the outer wall of the steel pipe, and promotes cathodic protection in some places. Common exterior anticorrosion methods include coatings such as petroleum pitch and epoxy coal pitch. The latter does not easily cure at low temperatures and presents many problems during field welding. In the past, chlorosulfonated polyethylene was used in large quantities due to the solvent. , prone to pinholes, substandard breakdown resistance, and no longer used in some areas. The anticorrosion effect of cathodic protection is better.

There are three commonly used methods for the inner wall treatment of seamless steel pipes: anti-corrosion coating, resin mortar and cement mortar. But these three methods have two problems: one is the bonding strength of the anti-corrosion layer and the steel pipe. Regarding the two methods of anti-corrosion coating and resin mortar, both the inner and outer walls of the steel pipe need to be derusted before construction, but this is difficult to achieve. As a result, rust spots will form a source of delamination in the future, constituting corrosion and scaling. Secondly, most steel pipes are butt welded on site, and anti-corrosion treatment is required after welding. It can only be done manually and the quality is not easy to control. For small-diameter steel pipes, since personnel cannot enter the construction environment, anti-corrosion treatment cannot be performed, which also has potential hidden dangers of future welding damage.

Article source: https://article-realm.com/article/Finance/20269-Anti-corrosion-treatment-method-for-inner-and-outer-walls-of-seamless-steel-pipes.html