Common corrosion of stainless steel pipes mainly include physical corrosion, chemical corrosion and electrochemical corrosion. However, in practical applications, most cases are electrochemical corrosion. Listed below are several specific reasons that easily cause electrochemical corrosion.

The first is stainless steel. If a stainless steel model with weak corrosion resistance is used, it is still susceptible to corrosion. Generally, 304 stainless steel pipes contain nickel and have better acid resistance in highly polluted industrial areas and humid atmospheric environments, and are widely used in various fields. The application in gas engineering is also relatively good.

The second factor is the influence of external factors. After the main construction of the building is completed, oxalic acid is usually used to clean the walls and water before delivery. Oxalic acid will directly cause electrochemical reactions in stainless steel, leading to corrosion. Even a week after oxalic acid cleaning, if a large amount of oxalic acid remains in the soil, it will still be corrosive to stainless steel pipes after evaporation.

In addition, there are other influencing factors. If thin-walled stainless steel pipes are bumped, dented, or scratched during stacking, transportation, and construction, they will cause local weakness in the pipe and a decrease in corrosion resistance. If impurities are mixed into the pipe itself during the production process, it will also cause local corrosion of the pipe.

In view of the various corrosion situations that stainless steel pipes may face, some solutions are proposed below.

A clear silicone protective film can be applied to the pipes. Because silicone resin has excellent thermal oxidation stability, electrical insulation properties, excellent moisture resistance, waterproofing, rust resistance, cold resistance, ozone resistance and weather resistance, it can effectively prevent pitting corrosion of stainless steel pipes. The implementation of this method mainly involves thin-walled stainless steel pipe manufacturers painting or spraying the pipes before leaving the factory. Later maintenance can be done manually on site. There will be obvious differences between the pipes before and after painting.

Secondly, you can choose materials with stronger corrosion resistance. Due to the addition of molybdenum element, the grade 316 stainless steel pipe has a special corrosion-resistant structure and better resistance to chloride corrosion. It is now mainly used in severely corrosive industries or marine atmospheres. In the future, it can be tried in gas engineering. used in.

You can choose a reasonable construction time. The installation of thin-walled stainless steel pipes should be carried out 10 days after cleaning the wall with oxalic acid to minimize the corrosion effect of oxalic acid on the pipes. After the installation is completed, it is necessary to prevent the use of oxalic acid to clean the wall. If it is unavoidable, protective measures should be taken before implementation.

The last point is to strengthen management. During the construction process, avoid violent collision or friction between thin-walled stainless steel pipes and other objects. After installation, stainless steel pipes must be cleaned in time to avoid cement, wall paint and other debris attached to the surface of the pipes.