An analysis of starburst defects in wrinkled powder coatings

Veronica Reichert, Soumendra K. Basu, Lorraine F. Francis, Alon V. McCormick, L. E. Scriven

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Starbursts are defects in wrinkled powder coatings wherein the typical random orientation of the wrinkles is disrupted. Instead, wrinkles orient radially around a central point creating a star-like pattern. The origin of the starburst defect was investigated by mechanical profilometry and elemental analysis by energy dispersive X-ray spectroscopy (EDS). Topographical measurements demonstrated that the centers of the stars almost always are at a higher elevation compared to their surroundings, suggesting the presence of non-dispersed extender particles or external impurities at the center. EDS analysis of the center of the stars confirmed the presence of external particles or impurities. Radial orientation of the wrinkles around the external particles can be explained by preferential pattern orientation due to directional stress relief.

Original languageEnglish (US)
Pages (from-to)33-37
Number of pages5
JournalProgress in Organic Coatings
Volume63
Issue number1
DOIs
StatePublished - Jul 1 2008

Keywords

  • EDS
  • Powder coating
  • Profilometry
  • Starburst
  • Wrinkle

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