The influence exerted by phenylthiourea (PTU) towards the corrosion of Fe79B16Si5 metallic glass in deaerated 0.1NH2SO4 was investigated by direct-current (potentiodynamic polarization) and alternating-current (impedance spectroscopy) techniques. The inhibiting action found on the Fe79B16Si5 glassy alloy was compared to the corresponding one obtained on annealed polycrystalline Armco iron and on a previously tested Fe81B13.5Si3C2 amorphous alloy. The inhibitor film formed more rapidly and was more protective and stable on the amorphous alloys than on polycrystalline iron and a PTU concentration as low as 10−5Mwas sufficient to build instantaneously an efficient film on the surfaces of the metallic glasses. On these surfaces, a greater amount of PTU was chemisorbed than on the crystalline iron, an effect which leads to a more complete and protective film.

Inhibiting action of phenylthiourea towards iron based metallic glass corrosion in acid environment

FRIGNANI, Alessandro;MONTICELLI, Cecilia;ZUCCHI, Fabrizio;TRABANELLI, Giordano
2005

Abstract

The influence exerted by phenylthiourea (PTU) towards the corrosion of Fe79B16Si5 metallic glass in deaerated 0.1NH2SO4 was investigated by direct-current (potentiodynamic polarization) and alternating-current (impedance spectroscopy) techniques. The inhibiting action found on the Fe79B16Si5 glassy alloy was compared to the corresponding one obtained on annealed polycrystalline Armco iron and on a previously tested Fe81B13.5Si3C2 amorphous alloy. The inhibitor film formed more rapidly and was more protective and stable on the amorphous alloys than on polycrystalline iron and a PTU concentration as low as 10−5Mwas sufficient to build instantaneously an efficient film on the surfaces of the metallic glasses. On these surfaces, a greater amount of PTU was chemisorbed than on the crystalline iron, an effect which leads to a more complete and protective film.
2005
Frignani, Alessandro; Monticelli, Cecilia; Zucchi, Fabrizio; Trabanelli, Giordano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516911
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