Comparative Dissolution Modes of Iron-Based Amorphous Alloys and Other Corrosion Resistant Polycrystalline Materials

Conference · Tue Mar 06 04:00:00 EST 2007

OSTI ID:917907

Rebak, R B; Hailey, P D; Day, S D; Farmer, J C

Metallic amorphous alloys or metallic glasses have been studied extensively for the last three decades due to their unique characteristics, including superior mechanical properties and corrosion resistance. Iron-based amorphous alloys have in general better corrosion resistance than their polycrystalline cousins such as the austenitic 18-8 stainless steel series (e.g. 316L SS). Fe-based amorphous alloys have even higher localized corrosion resistance than the nickel-based Alloy 22 under many laboratory tested conditions. Electrochemical laboratory tests have shown that when polycrystalline alloys such as Alloy 22 are anodically polarized in hot concentrated chloride brines, they dissolve unevenly following patterns associated with their crystalline character. However, amorphous alloys, when polarized to even higher potentials than the polycrystalline alloys, they dissolve in a desirable uniform manner. This is because the amorphous Fe-based alloys do not offer defects in the metal that can be preferentially attacked. Comparative studies will also be presented on the dissolution modes of Ni-gadolinium and borated stainless steels.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 917907
• Report Number(s): UCRL-PROC-228828
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
BRINES
CHLORIDES
CORROSION
CORROSION RESISTANCE
DEFECTS
DISSOLUTION
MECHANICAL PROPERTIES
METALLIC GLASSES
STAINLESS STEELS