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Title: A scanning Kelvin probe analysis of aluminum and aluminum alloys

Abstract

A scanning Kelvin probe was used to determine a correlation between work function measurements in air and corrosion potential measurements in solution of pure metals. Test panels of AA2024-T3 treated with various surface preparations and primer/coatings were also analyzed using this technique. Filiform corrosion was observed on a scribed panel that had been exposed to a humid environment, whereas on a non-scribed and non-exposed test panel, holidays in the coating were observed and clearly defined. Work function (wf) analysis yielded more noble values for areas within the scribe mark and more active values were observed for areas adjacent to the scribe mark where delamination of the coating and filiform corrosion was observed. The tips of corrosion filaments were found to be anodic in relation to the body of the filament, with areas of activity extending away from the filaments themselves. Measurements made on an aircraft access panel resulted in the detection of a potential gradient within the repair area. These results indicate that the scanning Kelvin probe is a useful non-destructive technique for the detection of delamination and disbanding of coatings, coating anomalies and corrosion susceptibility of coatings on aluminum aircraft alloys.

Authors:
; ;
Publication Date:
Research Org.:
EG and G Instruments, Oak Ridge, TN (US)
OSTI Identifier:
20002539
Report Number(s):
CONF-990401-
TRN: IM200002%%539
Resource Type:
Conference
Resource Relation:
Conference: Corrosion NACExpo 99, 54th Annual Conference and Exposition, San Antonio, TX (US), 04/25/1999--04/30/1999; Other Information: 1 CD-ROM. Operating Systems: Windows 3.1, '95, '98 and NT; Macintosh; and UNIX; PBD: 1999; Related Information: In: Corrosion 99: Proceedings, [3500] pages.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; CORRELATIONS; WORK FUNCTIONS; CORROSION; NONDESTRUCTIVE TESTING; FAILURES; PROTECTIVE COATINGS; CORROSION PROTECTION; ALUMINIUM ALLOYS; ALUMINIUM

Citation Formats

Hansen, D C, Grecsek, G E, and Roberts, R O. A scanning Kelvin probe analysis of aluminum and aluminum alloys. United States: N. p., 1999. Web.
Hansen, D C, Grecsek, G E, & Roberts, R O. A scanning Kelvin probe analysis of aluminum and aluminum alloys. United States.
Hansen, D C, Grecsek, G E, and Roberts, R O. 1999. "A scanning Kelvin probe analysis of aluminum and aluminum alloys". United States.
@article{osti_20002539,
title = {A scanning Kelvin probe analysis of aluminum and aluminum alloys},
author = {Hansen, D C and Grecsek, G E and Roberts, R O},
abstractNote = {A scanning Kelvin probe was used to determine a correlation between work function measurements in air and corrosion potential measurements in solution of pure metals. Test panels of AA2024-T3 treated with various surface preparations and primer/coatings were also analyzed using this technique. Filiform corrosion was observed on a scribed panel that had been exposed to a humid environment, whereas on a non-scribed and non-exposed test panel, holidays in the coating were observed and clearly defined. Work function (wf) analysis yielded more noble values for areas within the scribe mark and more active values were observed for areas adjacent to the scribe mark where delamination of the coating and filiform corrosion was observed. The tips of corrosion filaments were found to be anodic in relation to the body of the filament, with areas of activity extending away from the filaments themselves. Measurements made on an aircraft access panel resulted in the detection of a potential gradient within the repair area. These results indicate that the scanning Kelvin probe is a useful non-destructive technique for the detection of delamination and disbanding of coatings, coating anomalies and corrosion susceptibility of coatings on aluminum aircraft alloys.},
doi = {},
url = {https://www.osti.gov/biblio/20002539}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 1999},
month = {Thu Jul 01 00:00:00 EDT 1999}
}

Conference:
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