Effect of annealing on the passive film stability and corrosion resistance of new families of iron-based amorphous metals

Download
Author
Omlor, Timothy
Date
2011-06Advisor
Farmer, Joseph
Brewer, Luke
Metadata
Show full item recordAbstract
Iron-based amorphous metals have incredible strength and hardness, and with the addition of alloying constituents, can also be formulated to have exceptional corrosion resistance. Compositions of several iron-based amorphous metals have been published, including several with very good corrosion resistance. The benefits of chromium, molybdenum, and tungsten on corrosion resistance has been previously studied and documented, however little is known about other alloying constituents and their effect upon devitrification and corrosion resistance. The compositions explored in this thesis research are the SAM40 base alloy and variations including systematic additions of nickel, yttrium, and titanium. Nickel is added to improve both mechanical properties and corrosion resistance. Yttrium is added to lower the critical cooling rate, thereby making the metallic glass easier to create and more stable once formed, thus improving the corrosion resistance. Adding titanium will enable the formation of an extremely stable protective titanium oxide film on the alloy's surface, which could enhance the corrosion resistance. Through xray diffraction and corrosion analysis, the effects of these alloy additions on the devitrification and corrosion resistance of this new class of amorphous metals have be quantified.
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.Collections
Related items
Showing items related by title, author, creator and subject.
-
Effect of Surface Roughness on Pitting Corrosion of AZ31 Mg Alloy
Mitchell, Jeffrey; Crow, Natalie; Nieto, Andy (MDPI, 2020);Magnesium is a highly desired material for multiple applications including automotive, aircraft, and biomedical components due to its high strength to weight ratio, non-toxicity, and its good machinability. The main drawback ... -
Corrosion and thermal processing in cold gas dynamic spray deposited austenitic stainless steel coatings
Luhn, John A. (Monterey, California: Naval Postgraduate School, 2016-06);This thesis presents research on the corrosion properties and effects of heat treatment on austenitic stainless steel coatings produced by the cold gas dynamic spray process on 316L stainless steel substrates. Previous ... -
Corrosion mechanisms and behavior of a P-130x Gr/6063 A1 composite in aqueous environments
Elkin, Leslie R. (Monterey, California: Naval Postgraduate School, 1990);The corrosion mechanisms and behavior of a P-130x graphite fiber reinforced 6063 aluminum composite laminate were studied. Electrochemical and total immersion tests were performed on the composite in 3.5% sodium chloride ...