Which gases commonly found in water can encourage corrosion?

The correct answer is based on the roles that oxygen and carbon dioxide play in the corrosion process. Oxygen is crucial because it acts as an oxidizing agent, which can react with metals present in pipes and structures, leading to corrosion. This reaction can be enhanced in the presence of moisture, as oxygen promotes the electrochemical processes that result in metal degradation.

Carbon dioxide can also contribute to corrosion, particularly in water systems. When carbon dioxide dissolves in water, it forms carbonic acid, which can lower the pH of the water. A lower pH can accelerate the corrosion of metals by making them more reactive. This interaction can be especially pronounced in systems with limited buffering capacity, where the carbonic acid can lead to more aggressive conditions for the metals.

Together, the presence of both oxygen and carbon dioxide creates an environment conducive to corrosion, making this combination a significant factor in the assessment of water quality and the integrity of infrastructure.