What is the principle of corrosion in the roof trusses of swimming pools?

I don’t have any experience myself, so I searched online to see if it might be helpful to you. The following content is excerpted from the article \"Failure Analysis of the Steel Structure Grid in a Swimming Pool and Design of Anti-corrosion Measures\", written by Liu Fuyun and others on Douding.com; it is hoped it will be useful to you: The water in swimming pools is disinfected using chlorides, and during this process hydrochloric acid and hypochlorous acid are produced, along with residual chlorine. The amount of residual chlorine increases as the amount of chlorine added increases. When its concentration reaches a certain level, the corrosiveness of water increases, leading to greater corrosion of the entire recycling system as well as the humid air inside. The humid environment in the pool area can cause corrosion and damage to the materials and equipment there.