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Title: Characterization of AA2024-T3 by scanning Kelvin probe force microscopy

Abstract

Volta potential mapping of AA2024-T3 on surfaces was performed with an atomic force microscope. A linear relation was found between the Volta potential measured in air and the corrosion potential in aqueous solution for a range of pure metal samples, indicating that this potential is a measurement of the practical nobility of the surface. Large differences in the Volta potential of intermetallic particles in AA2024-T3 and the matrix phase resulted in a potential map with high contrast that clearly identifies the location of the particles. All intermetallic particles, including the Mg-containing S-phase particles, had a Volta potential noble to that of the matrix. Surface films on the particles and the matrix were found to have strong effects on the potential, and probably explain the noble nature of the Mg-containing particles, which have been reported to be active to the matrix in solution. The effect of these surface films was examined by refreshing the sample surface using different techniques. Lateral heterogeneities in certain intermetallic particles were also revealed.

Authors:
;  [1]
  1. Ohio State Univ., Columbus, OH (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
653379
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Electrochemical Society; Journal Volume: 145; Journal Issue: 7; Other Information: PBD: Jul 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; SURFACE POTENTIAL; CORROSION; INTERMETALLIC COMPOUNDS; MICROSTRUCTURE

Citation Formats

Schmutz, P., and Frankel, G.S.. Characterization of AA2024-T3 by scanning Kelvin probe force microscopy. United States: N. p., 1998. Web. doi:10.1149/1.1838633.
Schmutz, P., & Frankel, G.S.. Characterization of AA2024-T3 by scanning Kelvin probe force microscopy. United States. doi:10.1149/1.1838633.
Schmutz, P., and Frankel, G.S.. Wed . "Characterization of AA2024-T3 by scanning Kelvin probe force microscopy". United States. doi:10.1149/1.1838633.
@article{osti_653379,
title = {Characterization of AA2024-T3 by scanning Kelvin probe force microscopy},
author = {Schmutz, P. and Frankel, G.S.},
abstractNote = {Volta potential mapping of AA2024-T3 on surfaces was performed with an atomic force microscope. A linear relation was found between the Volta potential measured in air and the corrosion potential in aqueous solution for a range of pure metal samples, indicating that this potential is a measurement of the practical nobility of the surface. Large differences in the Volta potential of intermetallic particles in AA2024-T3 and the matrix phase resulted in a potential map with high contrast that clearly identifies the location of the particles. All intermetallic particles, including the Mg-containing S-phase particles, had a Volta potential noble to that of the matrix. Surface films on the particles and the matrix were found to have strong effects on the potential, and probably explain the noble nature of the Mg-containing particles, which have been reported to be active to the matrix in solution. The effect of these surface films was examined by refreshing the sample surface using different techniques. Lateral heterogeneities in certain intermetallic particles were also revealed.},
doi = {10.1149/1.1838633},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 145,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 1998},
month = {Wed Jul 01 00:00:00 EDT 1998}
}