What is one common cause of corrosion in water systems?

Free oxygen is a common cause of corrosion in water systems because it promotes the oxidation of metal surfaces, leading to the formation of rust and other corrosive by-products. When oxygen is dissolved in water, it interacts with metals such as iron and steel, facilitating electrochemical reactions that result in the deterioration of these materials. This process can be exacerbated in systems where water is stagnant, as oxygen levels can become concentrated and increase the rate of corrosion.

In contrast, low temperatures typically slow down the rate of chemical reactions, including those leading to corrosion. Iron bacteria can cause issues in water systems, but their primary effect is the production of organic matter and slime that can lead to clogging, rather than direct corrosion. Chemical treatments are often employed to mitigate corrosion, rather than cause it, as they can help create protective layers on metal surfaces or alter the water chemistry to minimize corrosive effects.