GoKawiilStudy finds sliding raindrops build electric charge that corrodes coated metal
Researchers at the Max Planck Institute for Polymer Research found that water droplets sliding down smooth surfaces such as glass, leaves, and Teflon-coated copper accumulate an electric charge. When these charged droplets reached copper plates coated with Teflon, they burrowed through the coating and pitted the metal beneath, an effect not seen when water simply dripped straight onto the plates without first sliding across another surface. The findings, published in Nature, also help explain why water moves more slowly than expected across seemingly frictionless smooth surfaces.
GoKawiil's interpretation of the reporting above, not reported fact.
The discovery reveals a previously unrecognized mechanism behind metal corrosion, one that could affect infrastructure, pipelines, aircraft, and any coated metal exposed to rain or sliding liquids. Understanding this electrification process could lead to better protective coatings and materials designed to resist charge buildup, potentially saving significant maintenance and replacement costs across industries.
- Water droplets sliding down smooth surfaces can accumulate electric charge, unlike static droplets.
- This charge appears capable of physically eating through metal even when protective coatings like Teflon are present.
- The research resolves a longstanding physics puzzle about why water moves slower than expected on frictionless-seeming smooth surfaces.
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Published there as: “Electric rain can eat through metal”
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