Which statement is NOT a factor influencing corrosion in metal pipes in water/wastewater systems?

Which statement is NOT a factor influencing corrosion in metal pipes in water/wastewater systems?

• A. Water chemistry (pH, chloride), temperature, oxygen, biofilm, flow velocity.
• B. Solar radiation.
• C. The color of the pipe coating.
• D. Flow rate alone.

Answer: (C)

Corrosion in metal pipes exposed to water or wastewater comes from the chemistry and flow conditions at the metal surface. Water chemistry, including pH and chloride levels, changes how aggressively the fluid reacts with the metal and can destabilize protective films. Temperature speeds up the electrochemical reactions, making corrosion more likely as it rises. Oxygen is a key reactant in many corrosion processes, so its presence influences rate. Biofilms create microenvironments that alter local chemistry and can promote localized corrosion. Flow velocity or turbulence affects how quickly corrosive species reach the surface and can erode protective layers, increasing corrosion risk. Solar radiation doesn’t impact the inside of buried or submerged pipes, so it isn’t a factor for corrosion in these systems. The color of the pipe coating by itself does not influence corrosion; color is a cosmetic attribute and does not alter the electrochemical processes that drive corrosion.

Corrosion in metal pipes exposed to water or wastewater comes from the chemistry and flow conditions at the metal surface. Water chemistry, including pH and chloride levels, changes how aggressively the fluid reacts with the metal and can destabilize protective films. Temperature speeds up the electrochemical reactions, making corrosion more likely as it rises. Oxygen is a key reactant in many corrosion processes, so its presence influences rate. Biofilms create microenvironments that alter local chemistry and can promote localized corrosion. Flow velocity or turbulence affects how quickly corrosive species reach the surface and can erode protective layers, increasing corrosion risk. Solar radiation doesn’t impact the inside of buried or submerged pipes, so it isn’t a factor for corrosion in these systems. The color of the pipe coating by itself does not influence corrosion; color is a cosmetic attribute and does not alter the electrochemical processes that drive corrosion.