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Research Article Open access CC BY 4.0

Simple Optical Measurements of Pre-treated Surface Roughness for Thermal Spray

Yukihiko Yamagata, Ryo Iwasaka, Keita Shigyo, Juntaro Tanaka, Yasuyuki Kawaguchi, Katsunori Muraoka

Journal of Engineering Research and Reports · pp. 1–10 · Published 1 Jun 2020

10.9734/jerr/2020/v13i217095

Abstract

For achieving satisfactory performance of coating layers obtained using the thermal spray technique, pre-treatments are carried out by roughening the smooth surfaces of metals to more than a few tens of μm.  Although a surface roughness tester is reliable for quantitatively measuring the surface roughness, it requires expertise and a long measuring time.  In the present article, a simple optical method is presented which the authors hope will replace the above surface roughness tester. The proposed method relies on first projecting a narrow beam of light from a light-emitting diode obliquely over the roughened surface, and then on measuring the distortion of the light as observed perpendicular to the surface.  Proof-of-principle experiments were performed first against a surface roughness comparator, and then against actual blasted surfaces using both the optical method and the surface roughness tester, yielding the two methods to be in good agreement.

Surface roughness roughness parameter optical measurement LED light microscope

References (2)

  1. 1 Thermally Sprayed Aluminum Coatings for the Protection of Subsea Risers and Pipelines Carrying Hot Fluids [DOI]
  2. 2 Surface Roughness—Part 4, Mechanics, Design and Measurement Principles on Sensor of Contact Stylus Profiler, and Quality Use of Mechanisms— [DOI]

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