Which gases found in water encourage corrosion?

The presence of oxygen and carbon dioxide in water is significant when discussing corrosion. Oxygen is a critical factor in the process of oxidation, which is one of the primary mechanisms that lead to the deterioration of metals. When oxygen dissolves in water, it can promote the oxidation of metallic elements, resulting in corrosion.

Carbon dioxide, when dissolved in water, forms carbonic acid. This weak acid can react with minerals and metals, further exacerbating the corrosion process. The formation of carbonic acid lowers the pH of the water, making it more aggressive towards metals, especially in the presence of oxygen.

Together, these gases create an environment that fosters the electrochemical reactions necessary for corrosion to occur, particularly for materials like iron and steel, which are commonly found in water distribution systems and wastewater treatment facilities. This understanding is crucial for maintaining the integrity and longevity of water systems and developing strategies to mitigate corrosion.