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Evaluation of WB Coatings by Scanned Imaging Microscopy

[+] Author Affiliations
Jikai Du, Bernhard R. Tittmann

Pennsylvania State University, University Park, PA

Paper No. PVP2003-1861, pp. 119-124; 6 pages
doi:10.1115/PVP2003-1861
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Ultrasonic Nondestructive Evaluation for Material Science and Industries
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1697-4
  • Copyright © 2003 by ASME

abstract

Organic thick coatings (epoxy, polyurethane, and acrylic-urethane) have been widely applied to high modulus substrates (e.g., steel) for anticorrosion protection. To improve performance, reinforced components (clay, bochmite, nanopaticles, etc.) are usually added to these coatings. However, the acoustic evaluation of these coatings is difficult due to their low acoustic velocities and high attenuation coefficients. In this paper, first, the scanning acoustic microscope (SAM) is used to image sub-surfaces, coating/substrate interfaces, and to measure acoustic velocities. Different phases can be observed on some coatings and defects can be found at some interfaces. Secondly, the atomic force microscope (AFM) is applied to image surfaces at high resolution (compared to SAM). These results agree with SAM images. Thirdly, a nano-indentation technique is utilized to measure the reduced Young’s modulus and absolute hardness of the coatings. The results show that epoxy has the highest Young’s modulus and acrylic-urethane has the lowest. Reinforced components can either increase or decrease Young’s modulus, and hardness depending on the coating material. Finally, results from the SAM, AFM and nano-indentation are compared and analyzed to optimize the evaluation.

Copyright © 2003 by ASME

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