The corrosion behavior of bearing steels was screened using potentiodynamic scans in seawater. The results of electrochemical testing provided a relative ranking of the bearing steels when tested in aqueous chloride-containing solution. The corrosion behavior of bearing steels in the lubricant environment has been observed to be quite different than in aqueous solution. Both the amount of water contamination in oil and chloride content of the water impact the observed corrosion rates in oil-water mixtures. All steel compositions tested demonstrated localized corrosion damage when exposed to oil with water added; however, inherently less corrosion-resistant alloys had more widespread shallow attack, whereas higher Cr-containing alloys displayed more localized severe attack. The mechanism of corrosion in the two-phase, oil plus aqueous phase system appears to be controlled by an aqueous corrosion process dependent on steel microstructure and emulsified or free water and likely limited by oxygen availability and amount of water (with aggressive ions) in the oil.
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1 July 2012
Research Article|
May 16 2012
Corrosion Assessment and Characterization of Aerospace-Bearing Steels in Seawater and Ester-Based Lubricants
‡ Corresponding author.
* Boise State University, Department of Materials Science and Engineering, 1910 University Dr., Boise, ID 83725.
** Concurrent Technologies Corp.
*** Drexel University.
**** Pratt and Whitney.
Received:
May 31 2011
Accepted:
November 15 2011
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2012 NACE International
2012
CORROSION (2012) 68 (7): 645–661.
Article history
Received:
May 31 2011
Accepted:
November 15 2011
Citation
M.F. Hurley, B.M. Marx, K.N. Allahar, C.P. Smith, H.A. Chin, W.P. Ogden, D.P. Butt; Corrosion Assessment and Characterization of Aerospace-Bearing Steels in Seawater and Ester-Based Lubricants. CORROSION 1 July 2012; 68 (7): 645–661. https://doi.org/10.5006/0459
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