Charged Rain Drops Reveal a Hidden Route to Metal Corrosion
New research shows electrically charged water droplets can trigger dielectric breakdown of protective coatings on metals, causing corrosion beyond the impact damage usually blamed. Lab tests on copper and gold coatings demonstrated that charged drops moving across surfaces promote coating breakdown and metal degradation, with implications for artifacts, buildings, ships, and industrial components. The findings suggest a need to rethink protection strategies and quantify real-world risk, as naturally charged drops occur in rain, waves, fountains, and some industrial processes.