Studies of passive films on friction stir processed Ni-Al bronze
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Authors
Farmer, Joseph C.
Legrande, Peggy S.
Menon, Sarath K.
McNelley, Terry R.
Subjects
Nickel aluminum bronze
NAB
Friction stir processing
ESP
Friction stir welding
FSW
cycle polarization
CP
Electrochemical impedance spectroscopy
EIS
Scanning electron microscopy
SEM
NAB
Friction stir processing
ESP
Friction stir welding
FSW
cycle polarization
CP
Electrochemical impedance spectroscopy
EIS
Scanning electron microscopy
SEM
Advisors
Date of Issue
2013-10-04
Date
Publisher
Livermore, California. Lawrence Livermore National Laboratory
Language
Abstract
The Friction Stir Processing (FSP) and Friction Stir Welding (FSW) welding of nickel
aluminum bronze (NAB) is used for a variety of naval applications. This paper investigates the
beneficial effects of FSP on NAB passivity, and provides important benchmark data for future
studies. Further enhancement of FSP NAB through application of LP will be discussed in subsequent
papers, using the data presented here as a basis of comparison. This work shows that FSP has a
beneficial effect on both the microstructure of this alloy, as well as on the integrity of the
passive film formed in chloride electrolytes, including natural seawater. In addition to using a
variety of characterization techniques to determine the effects of friction stir processing on
microstructure, including scanning electron microscopy (SEM) with focused ion beam milling, we have
used cyclic polarization (CP) and electrochemical impedance spectroscopy (EIS) to develop an
understanding of passive film behavior for this material in the as-received state, as well as after
friction stir processing. A variety of interfacial impedance models have been explored for fitting
the data, including transmission line models. Results on this important alloy, before and after
processing will be presented.
Type
Article
Description
Series/Report No
Department
Mechanical and Aerospace Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Department of Energy (DOE)
Funder
Contract DE-AC52-07NA27344
Format
4 p.
Citation
J.C. Farmer, P.S. Legrande, S.K. Menon, T.R. McNelley, "Studies of passive films on Friction stir processes Ni-Al bronze," LLNL-PROC-644559 2014 Spring Meeting of MRS, April 21-25 San Francisco, California, 4 p.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.