{
  "id": 13171776,
  "title": "AI reveals how coating thickness changes the link between surface roughness and pitting resistance",
  "url": "https://urgent.news/2026/10/09/ai-reveals-how-coating-thickness-changes-the-link-between-surface",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-09T17:40:01.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-10-ai-reveals-coating-thickness-link.html"
  },
  "original_language": "en",
  "account": "A research team at Shibaura Institute of Technology in Japan used machine-learning to investigate how coating thickness affects the relationship between surface roughness and pitting resistance in steam-coated aluminum components. They analyzed 90 specimens of A6061-T6 aluminum coated with boehmite films. The team measured four descriptors - film thickness, surface morphology, crystallite size, and substrate dislocation density index - to assess pitting resistance in a sodium chloride solution. The machine learning model predicted corrosion resistance better than one based only on processing conditions. The analysis found that surface roughness and film thickness were the most important descriptors for predicting corrosion resistance. Importantly, the interaction between roughness and thickness changed depending on the coating's thickness. For roughness values of about 600-1,080 nm, the model showed a reversal where the positive interaction near 2,200 nm film thickness became negative. This suggests a change in how surface roughness represents protective coverage in thinner coatings versus structural irregularities in thicker ones. The researchers emphasize that higher surface roughness is not inherently beneficial or harmful to pitting resistance; its effect depends on the coating's growth regime. They suggest further experimental validation of the model's predictions and the potential application of this approach to other interface-controlled materials like environmental barrier coatings and battery interphases.",
  "summary": "Localized pitting corrosion can cause sudden failure in aluminum components even when overall corrosion rates are low. Steam coating offers a water-vapor-based route to protective boehmite films, but processing simultaneously changes film thickness, surface morphology, crystallinity and substrate defects.",
  "key_points": [],
  "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."
}