Article Article
Surface Roughness Measurements of Non-Stick Coatings on Metal Plates

Surface roughness values (Ra, Rz, etc.) are important in many applications, industries and materials. Roughness values can be measured by contact methods (Stylus instrument, frictional dynamometer, thermal comparator, electrical methods, etc.) or optical methods (optical probes using laser or infrared beams). Modern digital imaging technologies like digital or laser scanning testers can provide 3D dimensional surface morphology of different types of surface coatings. A local engineering industrial partner needed a method to evaluate the consistency and uniformity of different machined finishes and non-stick release coatings which improve release and reduce wear. Surface roughness measurements were used to evaluate the consistency and uniformity of the finish and coating on samples from multiple suppliers. In this paper, a 3D scanning laser microscope was used to perform the variety types of surface roughness measurements to evaluate the uniformity of different layers of coatings on the specimens. Although not critical for this testing, the use of the laser microscope allowed a non-contact method for measuring surface roughness in order to not damage the coating on the material. Cross-sectional views of these same layers were cut and measured using Keyence digital microscope to evaluate the consistency of the finishing surfaces.

  1. Tushinsky, L. I., I. Kovensky, A. Plokhov, V. Sindeyev and P. Reshedko, Coated Metals: Structure and Properties of Metal Coating Compositions, Springer 2002
  2. Poon, Chin Y., Bharat Bhushan, Comparison of surface roughens measurements by stylus profiler, AFM and noncontact optical profiler, Elsevier Wear 190 (1995) 76-88
  3. JIS B 0601:2001, Surface Roughness measurement, Technical Information, 2001
  4. Langhorn, Charles, Arthur Howe, Optical Morphology: Just how smooth is that surface, PHOTONIC SPECTRA, Laurin Publishing, June 1998.
  5. Pavlovic, Zivko Dragoljub Novakovic, Sandra Dedijer and Magdolna Apro Changes in the surface roughness of aluminium oxide (non-printing) areas on offset printing plate depending on number of imprints, Journal of Graphic Engineering and Design, Volume 1, 2010.
  6. VHX- 600 Reference Manual, KEYENCE Digital Microscope, CORPORATION, Osaka, Japan.
  7. VK Analyzer and VK Analyzer Plus Reference Manual, KEYENCE Color 3D Laser Microscope VK-9700 K/VK-8700K, KEYENCE CORPORATION, Osaka, Japan.
Usage Shares
Total Views
82 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage