The purpose of pipeline acid pickling and passivation
Release time:2024-03-12
Acid pickling passivation is a commonly used method for surface treatment of pipelines, mainly to remove impurities such as oxide scale, rust, and pollutants on the surface of pipelines, and improve the smoothness and corrosion resistance of the inner walls of pipelines.
During the manufacturing, transportation, and use of pipelines, they are often affected by factors such as oxidation, corrosion, and pollution, which can reduce the durability and safety of pipelines. Therefore, adopting acid pickling and passivation treatment can effectively reduce these problems. Acid pickling passivation is a commonly used method for surface treatment of pipelines, mainly to remove oxidation on the surface of pipelines
Specifically, the process of acid pickling and passivation includes the following steps:
00001. Acid washing: Remove the oxide scale and rust layer on the surface of the pipeline through chemical reaction in acidic solution. Acid washing can effectively remove oxides and impurities from the surface of pipelines, making the pipeline surface smoother, increasing the contact area with the medium, and further improving the heat and mass transfer performance of pipelines.
00002. Passivation: After pickling, the surface of the pipeline is treated with a passivating agent to form a uniform and dense oxide film. This oxide film can block the entry of external oxygen and moisture, achieving anti-corrosion effect. At the same time, the oxides in the oxide film have high stability and can improve the corrosion resistance of pipelines.
Why acid wash and passivate pipelines?
Firstly, acid pickling and passivation can effectively remove oxides and impurities such as oxide scale and rust on the surface of pipelines, reduce the roughness of the inner wall of pipelines, and improve the smoothness and surface quality of pipelines.
Secondly, acid pickling and passivation can form a uniform and dense oxide film, effectively preventing the entry of external oxygen and moisture, reducing the degree of corrosion of pipelines, and extending their service life.
In addition, acid pickling and passivation can also increase the contact area between pipelines and media, improve heat and mass transfer performance, and facilitate the improvement of heat exchange and fluid transmission efficiency in pipelines.
In summary, acid pickling and passivation is a commonly used method for surface treatment of pipelines. By removing impurities and forming oxide films, the smoothness, corrosion resistance, and heat and mass transfer performance of pipelines can be improved, and the service life of pipelines can be extended. Acid pickling and passivation treatment have important application value in the pipeline industry.