Corrosion performance of high damping alloys in 3.5% sodium chloride solution

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Author
Akhtar, Saleem
Date
1987-09Advisor
Perkins, Jeffery Arthur
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Show full item recordAbstract
The electrochemical nature of corrosion provides a
means of determining an almost instantaneous corrosion rate.
Corrosion rate and the nature of corrosion attack were
investigated for several high damping alloys based on the
Cu-Mn, Fe-Cr-Al, Fe-Cr- Mo, and Cu-Zn systems in 3.5% NaCl
solution. The results of Potentiodynamic polarization and
polarization resistance measurements were compared with the
results of actual sea exposures. A zero resistance ammeter
technique was used to measure the galvanic currents between
galvanically coupled metals. The magnitude of the galvanic
current provide an indication of the severity of galvanic
corrosion which occurs in a 3.5% NaCl environment. Scanning
electron microscopy (SEM) was used to determine the nature
of corrosive attack and the extent of film formation on the surface of each corroding alloy. Results from Laboratory
and actual sea exposures showed that the Fe-Cr-Al and Fr-Cr-
Mo high damping alloys experienced severe localized
corrosion and pitting. 630 Bronze and Cu-Mn-Al based alloys
indicate low to moderate corrosion rates.
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