Raindrops Carry Tiny Electrical Charges That Eat Through Your Car's Fresh Paint Job
Gizmodo • • science
Key Points:
- New research reveals that electrically charged water drops can cause corrosion by breaking down protective coatings on metal surfaces, beyond the previously known effects of salts, acids, and pollutants in rainwater.
- The study, published in Nature, demonstrated that water drops sliding over surfaces acquire a small electrical charge, which can generate sparks strong enough to damage coatings like Teflon and lead to metal corrosion.
- Experiments showed that after exposure to thousands of charged water drops, Teflon coatings on copper degraded, whereas uncharged water drops caused no damage, highlighting the role of electrical charge in corrosion.
- These findings suggest that the electrical state of water is a critical factor in surface damage and could influence the development of more durable protective coatings for metals used in cars, bridges, and ships.
- Future protective coatings may need to be thicker or specifically engineered to resist damage from electrically charged water drops, though further research is required to optimize such designs.
