Which factor reduces corrosion of steel in bridges?

Which factor reduces corrosion of steel in bridges?

• A. Protective coating
• B. Increasing load
• C. Higher humidity
• D. Lower temperature

Answer: (A)

Corrosion of steel in bridges happens when moisture, oxygen and ions in the environment reach the steel surface and drive electrochemical reactions. A protective coating acts as a barrier, keeping water, oxygen and salts away from the metal so the corrosion reactions slow dramatically. That direct barrier effect is why coatings are the most effective way to reduce corrosion. Increasing load doesn’t stop corrosion and can lead to other failures; higher humidity promotes corrosion by increasing moisture exposure; lower temperature can slow corrosion somewhat but doesn’t prevent it, whereas a coating consistently blocks the corrosive agents.

Corrosion of steel in bridges happens when moisture, oxygen and ions in the environment reach the steel surface and drive electrochemical reactions. A protective coating acts as a barrier, keeping water, oxygen and salts away from the metal so the corrosion reactions slow dramatically. That direct barrier effect is why coatings are the most effective way to reduce corrosion. Increasing load doesn’t stop corrosion and can lead to other failures; higher humidity promotes corrosion by increasing moisture exposure; lower temperature can slow corrosion somewhat but doesn’t prevent it, whereas a coating consistently blocks the corrosive agents.