Chemical cleaning of steel structure by general steel structure manufacturers is a process step at the end and is the key step. The purpose is to prevent corrosion of materials. After acid cleaning, water washing and rinsing, the metal surface is very clean and easy to be corroded. Therefore, passivation must be conducted immediately to generate protective film on the cleaned surface to slow down corrosion.
First, the treatment before passivation. In the conventional environment, the surface of steel structure will have grease, oxide dirt and other pollution. Therefore, it must be effectively removed before passivation to ensure a better passivation effect.
Secondly, in the passivation process of steel structure processing, it is important to grasp the passivation time and passivation agent related to passivation thermometer. It is necessary to choose relatively mature, high-performance and environmental friendly passivator of stainless steel. Although the concentration of passivation agent will reduce the passivation time, it can get better passivation performance for a long time.
After passivation, it is not finished completely. Stabilization treatment is needed. After treatment agent is used, it is easy to improve the passivation stability of steel structure.
In order to prolong the service life of steel structure engineering, passivation treatment should be carried out during the process, so that its corrosion rate can be reduced.
