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Proceedings Paper

Characterization of metal smear in consideration of prepenetrant etch requirements
Author(s): Julie Henkener; Charles Salkowski
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Paper Abstract

A controversy exists within the aerospace community as to whether etching of components before dye penetrant testing to remove metal smear is always necessary. A test program was initiated to detect the degree of metal smear present in aluminum alloy 2024-T851 after machining by various techniques. Use of the scanning electron microscope confirmed the presence of metal smear. In addition, dye penetrant tests were performed before and after a chemical etching process that removed approximately 0.0005 in. It was determined that etching always improves flaw detectability, even for cracks that have not been smeared.

Paper Details

Date Published: 7 July 1995
PDF: 8 pages
Proc. SPIE 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials, (7 July 1995); doi: 10.1117/12.213559
Show Author Affiliations
Julie Henkener, NASA Johnson Space Ctr. (United States)
Charles Salkowski, NASA Johnson Space Ctr. (United States)

Published in SPIE Proceedings Vol. 2455:
Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials
Tobey M. Cordell; Raymond D. Rempt, Editor(s)

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