Electric rain can eat through metal

image via New Scientist

August 26, 2026, 3:02 PM

• •Researchers reported in Nature that water droplets gain electric charge while sliding across smooth surfaces.
• •In experiments, charged droplets running down surfaces penetrated thin protective coatings and pitted underlying copper.
• •Droplets placed directly on the coated metal without first sliding down a surface did not show the same corrosive effect.
• •The team says an electric field forms between the positively charged water and negatively charged metal, intensifying as the droplet approaches.
• •Outside experts said the findings could help explain failures in corrosion protection and matter for infrastructure, industrial systems and implants.

A Nature study found that water droplets can become electrically charged as they move across smooth surfaces. In lab tests, those charged droplets burrowed through thin protective coatings and created pits in copper beneath them. The researchers say an electric field builds between the positively charged water and negatively charged metal, eventually becoming strong enough to trigger breakdown. Scientists say the work could improve understanding of corrosion that damages infrastructure, industrial equipment and other products.

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