C-scan images of ultrasonic immersion scan of sintered alumina and cordierite disc with imbedded foreign materials of pieces of paper, cotton wool and strain of hairs (about 56 µm in diameter) were studied. The inclusions were all reduced to carbon after sintering at 1550 degree Celsius. The aim was to quantified the resolution of the C-scan system that has been acquired recently by Nanyang Technological University. It was found that good depth and lateral resolutions can be obtained using focused 50 MHz probe. Studies into large pores and cracks in alumina and cordierite due thermal cycling is being conducted at the moment. corrosion [8, 9]. Also, holographic interferometry is being currently utilized to monitor pitting corrosion of several metals in aqueous solution and to measure the formation of an oxide layer at a metal surface. As a result, one may suggest that the techniques of holographic interferometry have many useful applications in the corrosion field yet to be explored.
The objective of the present work is to demonstrate the advantages and limitations of holographic interferometry in corrosion field. REFERENCES
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