{
  "id": 4812930,
  "title": "Sliding water droplets corrode Teflon-coated metal",
  "url": "https://urgent.news/2026/09/01/sliding-water-droplets-corrode-teflon-coated-metal",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-01T07:19:50.000Z",
  "source": {
    "name": "Physics World",
    "slug": "physics-world",
    "url": "https://physicsworld.com/a/sliding-water-droplets-corrode-coated-metals/"
  },
  "original_language": "en",
  "account": "Researchers in Germany have discovered that sliding water droplets can acquire electric potentials of thousands of volts, leading to corrosion of non-conductive surfaces on metals when they discharge. This phenomenon, previously unconsidered in conventional wisdom that corrosion is primarily caused by physical abrasion and chemical degradation, warrants further investigation to help prevent corrosion in outdoor equipment and cultural heritage sites. Physical chemist Hans-Jürgen Butt of the Max Planck Institute for Polymer Research in Mainz notes that while the triboelectric effect of charging objects by rubbing them together has been known for over 2500 years, its applicability to fluids was previously thought to be impossible. However, recent studies have shown that sloping surfaces, such as plant leaves and window glass coated with a Teflon-like material, can cause droplets to become positively charged as they slide down and discharge onto a copper surface. This discharge can create a potential difference exceeding 1 kilovolt, significantly higher than the dielectric breakdown strength of the coating, resulting in corrosion. The researchers found evidence of droplets corroding both the coating and the underlying metal after around 3000 droplet impacts. While the practical implications of this phenomenon in corroding technical coatings on cars and ships are unclear, it could be involved in the degradation of outdoor historical objects.",
  "summary": "Effect could damage outdoor equipment and monuments The post Sliding water droplets corrode Teflon-coated metal appeared first on Physics World .",
  "key_points": [
    "Sliding water droplets acquire electric potentials of thousands of volts.",
    "Discharged droplets corrode non-conductive surfaces on metals.",
    "Phenomenon could impact corrosion of outdoor equipment and heritage sites."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}