Characterization of Material Degradation in Epoxy Film Based on Scanning Acoustic Microscopy (SAM)


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In order to evaluate the degradation of the epoxy coating in nuclear power plants, acoustic wave velocities of epoxy films are measured using defocused scanning acoustic microscopy system(SAM). Unlike metals, the surface of the epoxy coating on the concrete liner is so thin and wavy that the conventional ultrasonic techniques for acoustic velocity of epoxy coating are hard to apply. Acoustic velocities of bulk waves are determined from V(z,t) curves of mode-converted waves generated in the film by SAM. Epoxy films are fabricated and degraded under various accelerated aging conditions, and both of longitudinal and shear wave velocities of the epoxy film are measured. Approximately 10% of reduction in acoustic wave velocity is observed from experimental results when the aging is developed fully in epoxy films. It is also found that longitudinal wave is more sensitive to deterioration of epoxy coating than transverse wave.



Key Engineering Materials (Volumes 321-323)

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi




N. Y. Kim et al., "Characterization of Material Degradation in Epoxy Film Based on Scanning Acoustic Microscopy (SAM)", Key Engineering Materials, Vols. 321-323, pp. 578-581, 2006

Online since:

October 2006




[1] Korea Electric Power Research Institute, Evaluation and Test of nonmetallic linner in Wolsung power plant, Research Report (1998).

[2] Nohyu Kim and H. Nah: Ultrasonic Evaluation of Epoxy Coating in Nuclear Power Plant�� Material Science Forum (2004), Vol. 449 -452, pp.1209-1212�.


[3] Y. Jin, H. Peng and D. Chen, A New Assessment Method for the Bulk Modulus and the Poisson's Ratio of Porous Ceramics, Journal of Testing and Evaluation, Vol. 28, No. 3, 2000, pp.189-198.

[4] T. K. Shen and P. Hing, Ultrasonic Through transmission Method of Evaluating the Mudulus of Elasticity of AL2O3-ZrO2 Composite, J of Mat. Sci. (1997), Vol. 32, 1997, pp.6633-6638.

[5] E. Drescher-Krasicka and C.P. Ostertag, Residual Steel Measurements in Welded Steel Beam Column Connections by SAM, J of Mat. Sci. (1999), Vol. 34, pp.4173-4179.