This paper presents the results of electrochemical tests on hard turned steel components that have white layer on the surface. Electrochemical impedance spectroscopy is used to compare a machined surface with white layer against a machined surface without white layer, an annealed surface, and an electrical discharge machined surface. Measurements of the steady-state open-circuit potential are also used for comparison. The results show that the electrochemical properties of a surface with white layer are distinct from a surface without white layer. Specifically, a surface with white layer is more anodic and has lower electrochemical impedance than a surface without white layer in a NaOH solution. These results provide insight into the electrochemical properties of white layer and indicate that surfaces with white layer may corrode more quickly in service.
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April 2007
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Inspection of White Layer in Hard Turned Components Using Electrochemical Methods
Ian S. Harrison,
Ian S. Harrison
The Timken Company
, 7 Research Drive, Greenville, SC 29607
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Thomas R. Kurfess,
Thomas R. Kurfess
International Center for Automotive Research,
Clemson University
, Clemson, SC 29634
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Edward J. Oles,
Edward J. Oles
Kennametal Inc.
, Latrobe, PA 15650
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Preet M. Singh
Preet M. Singh
School of Materials Science and Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332
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Ian S. Harrison
The Timken Company
, 7 Research Drive, Greenville, SC 29607
Thomas R. Kurfess
International Center for Automotive Research,
Clemson University
, Clemson, SC 29634
Edward J. Oles
Kennametal Inc.
, Latrobe, PA 15650
Preet M. Singh
School of Materials Science and Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332J. Manuf. Sci. Eng. Apr 2007, 129(2): 447-452 (6 pages)
Published Online: August 23, 2006
Article history
Received:
January 22, 2006
Revised:
August 23, 2006
Citation
Harrison, I. S., Kurfess, T. R., Oles, E. J., and Singh, P. M. (August 23, 2006). "Inspection of White Layer in Hard Turned Components Using Electrochemical Methods." ASME. J. Manuf. Sci. Eng. April 2007; 129(2): 447–452. https://doi.org/10.1115/1.2540655
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