Characterization of the corrosion behavior of high damping alloys in seawater.
Authors
Escue, William David.
Subjects
corrosion
damping
sea water
damping
sea water
Advisors
Perkins, Jeff
Date of Issue
1987-06
Date
June 1987
Publisher
Language
en_US
Abstract
Corrosion rates and the nature of corrosive attack were investigated for several high damping alloys, including alloys based on the Cu-Mn, Fe-Cr-Al, Fe-Cr-Mo, Ti-Ni, and Cu-Zn-Al systems. Rates and modes of attack were determined for exposure of samples in synthetic and natural seawater. The results of potentiodynamic polarization and polarization resistance measurements made in the laboratory were compared with the results of actual sea exposures at the LaQue Center for Corrosion Technology, Wrightsville Beach, North Carolina. These results were used to make tentative recommendations for in-service application of high damping alloys used singly or in combination with common aluminum alloys and steels in a marine environment. Overlays of independently determined potentiodynamic polarization plots for selected pairs of alloys were used to project theoretical corrosion rates in galvanic couples. A Galvanic Series for high damping and conventional alloys in quiescent synthetic seawater was developed. Results from laboratory and actual sea exposures showed that the Fe-Cr-Al and Fe-Cr-Mo high damping alloys experienced severe localized corrosion and pitting, the Ti-Ni alloy demonstrated a very slight corrosion rate, and the Cu-Mn-Al based and Cu-Zn-Al based alloys were characterized by low to moderate corrosion rates.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
Format
126 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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.