What is a common preventive measure against metal corrosion in aircraft?

Applying protective coatings or sealants is a widely accepted preventive measure against metal corrosion in aircraft. Corrosion occurs when metals react with environmental elements such as moisture, salt, and air, leading to degradation. To combat this, protective coatings or sealants create a barrier that isolates the metal from these corrosive agents.

These coatings can be made from various materials, including paints, galvanizing compounds, or specialized corrosion-resistant materials that not only protect against rust but may also include properties to resist impacts and abrasions. By employing these protective measures, the lifespan of the aircraft's metal components is significantly extended while maintaining structural integrity and safety.

Other options involve actions that either do not prevent corrosion effectively or could even exacerbate the problem. Using heavier metals may not address the fundamental issue of corrosion resistance. Increasing humidity levels would likely contribute to a more corrosive environment, while sanding metal surfaces could remove any existing protective layers and promote exposure to corrosion-causing elements.