Abstract
The impact of preliminary treatment (mechanical abrasion; chemical etching and anodization in ionic liquid) on the surface structure and corrosion behavior of Fe70Cr15B15 metal glass was studied. The detachment of the anodic oxide film from untreated Fe-amorphous alloy under anodization in ionic liquid was observed for the first time. The formation of hexagonal nanostructures (cells) on the surface of the Fe70Cr15B15 alloy after mechanical abrasion and following anodization in 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) ionic liquid was also detected for the first time. Electrochemical corrosion of the initial and pretreated amorphous alloy was tested in a Na2SO4 aqueous solution. The resistance to corrosion was found to be enhanced slightly after mechanical abrasion. The sample with hexagonal nanostructures obtained after anodization of the mechanically abraded sample demonstrated a more significant anodic shift in the corrosion potential (Ecorr = + 379 mV) compared with that for the initial alloy (Ecorr = −125 mV).
Highlights
IntroductionThe chemistry of metal glasses (amorphous alloys) has been intensively developed owing to the discovery of new properties and applications of these materials
In recent years, the chemistry of metal glasses has been intensively developed owing to the discovery of new properties and applications of these materials
Interesting data were observed for electrochemical oxidation of amorphous Fe70Cr15B15 alloy (AA) in Ionic liquids (ILs)
Summary
The chemistry of metal glasses (amorphous alloys) has been intensively developed owing to the discovery of new properties and applications of these materials. The liquid-like atomic structure, with no grain boundaries, dislocations, and phase segregation confers bulk metallic glasses superior mechanical properties involving high fracture strength and large elastic deformation [1]. Fe-based metal glasses were found to exhibit a higher strength, hardness, and corrosion resistance than other amorphous and crystalline alloy materials [2]. Amorphous alloys are widely applied in micro- and nano-electromechanical devices due to their outstanding physical and electrochemical properties [3]. Amorphous alloys are of particular interest as medical materials, for which one of the requirements is resistance to various types of corrosion [4,5].
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