Which of the following is a common measure to prevent corrosion?

Applying coatings or paints is a common and effective measure to prevent corrosion. This technique involves covering the metal surface with a protective layer that acts as a barrier against moisture, oxygen, and other corrosive agents. Coatings and paints can significantly enhance the durability of metal structures by inhibiting the electrochemical reactions that lead to corrosion. The effectiveness of this method can vary depending on the type of coating used and the environment in which the metal is situated, but it is an essential practice in corrosion prevention strategies.

The other options, while they might influence factors that contribute to corrosion, are not as directly effective on their own as the application of coatings. Increasing temperature often accelerates the corrosion process due to increased reaction rates. Reducing humidity can help, but it is not always feasible in all environments and may not be sufficient for long-term corrosion protection. Using stronger metals can improve resistance to corrosion, but it doesn’t prevent it entirely, as all metals can corrode under the right conditions. Hence, applying coatings or paints remains one of the most reliable and widely used methods in corrosion prevention.