Ultrasonic B-scans have the advantage of providing a visual image of the corroded cross-section of the skin by showing the profile of the top and bottom surfaces. It can be used to rule out anomalies in C-scans caused by reasons unrelated to corrosion and therefore has considerable practical value. The RF data of B-scans can be processed using a Fourier spectral phase calculation to obtain the thickness as a function of position. In this work X-ray line scans using a collimated beam provide answers for the thickness of remaining metal and serve as a check of the ultrasonic B-scan results. In comparing the ultrasonic and X-ray results, it is found that, although the presence and location of corrosion revealed by the two techniques generally agree, the amount of metal loss and the detailed profile of the corroded skin often show considerable differences. Certain corrosion morphology could contribute to such differences, but their verification still awaits future destructive analysis of the blind samples using in this study.
Quantitative measurement of metal loss due to corrosion in aluminum aircraft skin
Quantitative Messung des Metallverlustes bei der Korrosion von Aluminiumaußenhäuten der Luftfahrt
1996
7 Seiten, 4 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
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