Surface chemistry and topographical changes of an electropolished NiTi shape memory alloy
作者： Lakshman Neelakantan , Markus Valtiner , Gunther Eggeler , Achim Walter Hassel
关键词: Metallurgy 、 Phase (matter) 、 Surface roughness 、 Composite material 、 Shape-memory alloy 、 Electropolishing 、 Sulfuric acid 、 Nickel titanium 、 X-ray photoelectron spectroscopy 、 Chemistry 、 Sulfide
摘要: Electropolishing and its mechanism for NiTi shape memory alloy in methanolic sulfuric acid have been investigated recently. In the current study, X-ray photoelectron spectroscopy was carried out to characterize chemical nature of electropolished surface. The surface is covered by a thin layer TiO 2 . For an specimen, Ni:Ti ratio at (∼1 nm) 0.31, whereas mechanically polished specimen 0.70. second aspect this work attempt salt film formed during electropolishing. characterization salt-film showed sulfide sulfate compounds Ni and/or Ti. crystallographic topographical changes caused due thermally induced phase transformation on followed situ XRD AFM. AFM studies revealed significant features transformation. roughness value increased factor 2.
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