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1. Studies of passive films on friction stir processed Ni-Al bronze

Author

Farmer, Joseph C., Legrande, Peggy S., Menon, Sarath K., McNelley, Terry R., Naval Postgraduate School (U.S.), and Mechanical and Aerospace Engineering

Subjects
NAB, EIS, Friction stir welding, CP, FSW, Nickel aluminum bronze, SEM, ESP, Electrochemical impedance spectroscopy, Scanning electron microscopy, Friction stir processing, cycle polarization
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. Department of Energy (DOE) Contract DE-AC52-07NA27344

Published
2013

2. Long-term corrosion resistance of iron-based amorphous metal coatings

Author

Farmer, Joseph C., Omlor, Timothy J., Menon, Sarath K., Brewer, Luke N., Naval Postgraduate School (U.S.), and Mechanical and Aerospace Engineering (MAE)

Subjects
SAM1651, Cyclic polarization, EIS, Immersion testing, High performance corrosion resistant materials, Iron base amorphous metals, SAM2X5, LP, High velocity oxy fuel coating, Salt fog, SAM, Structural amorphous metals, HVOF, Corrosion testing, Electrochemical impedance spectroscopy
Abstract

Novel iron-based amorphous metals, including SAM2X5 Fe(49.7)Cr(17.7)Mn(1.9)Mo(7.4)W(1.6)B(15.2)C(3.8)Si(2.4)), SAM1651 (Fe(48.0)Cr(15.0)Mo(14.0)B(6.0)C(15.0)Y(2.0)), and other compositions have been developed for use as corrosion-resistant coatings for spent nuclear fuel containers, as criticality control materials, and as ultra-hard corrosion-resistant material for ship applications. These amorphous alloys appear to have corrosion resistance comparable to (or better than) that of Ni-based Alloy C-22 (UNS # N06022), based on measurements of breakdown potential and corrosion rate in seawater. A variety of characterization tools, including scanning electron microscopy, cyclic polarization, linear polarization and electrochemical impedance spectroscopy, have been used to develop a thorough understanding of the corrosion performance of these alloys over prolonged exposure in seawater and concentrated brines at elevated temperature. U.S. Department of Energy, National Nuclear Security Administration Contract DE-AC52-07NA27344

Published
2011

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