Electrochemical and spectroscopic studies on inhibition mechanism of benzyl thiocyanate for iron corrosion in 1 N perchloric and hydrochloric acid solutions

Electrochemical and spectroscopic studies on inhibition mechanism of benzyl thiocyanate for iron corrosion in 1 N perchloric and hydrochloric acid solutions

The inhibition mechanism of benzyl thiocyanate for iron corrosion in 1 N HClO 4 and 1 N HCl was investigated by polarization measurements and surface analyses. A protective film formed on the iron surface by the oxidative-addition reaction of the thiocyanate with iron was characterized using X-ray p...

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Veröffentlicht in:Corrosion science 1994-04, Vol.36 (4), p.583-591
Hauptverfasser: Ohno, Noriyuki, Nishihara, Hiroshi, Aramaki, Kunitsugu
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Sprache:eng
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Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
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container_title Corrosion science
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creator Ohno, Noriyuki
Nishihara, Hiroshi
Aramaki, Kunitsugu
description The inhibition mechanism of benzyl thiocyanate for iron corrosion in 1 N HClO 4 and 1 N HCl was investigated by polarization measurements and surface analyses. A protective film formed on the iron surface by the oxidative-addition reaction of the thiocyanate with iron was characterized using X-ray photo-electron and reflection Fourier Transform Infrared (FTIR) spectroscopy. A markedly high inhibition efficiency of this inhibitor was obtained for iron corrosion in 1 N HClO 4 at its high concentrations, as well as in H 2SO 4 previously reported, but not in 1 N HCl. Results of surface analyses suggested the formation of a protective layer composed of a ( η 3-benzyl) (thiocyanato) iron (II) complex on the surface in 1 N HClO 4. Since an unstable ( η 3-benzyl) (chloro) iron complex was formed in the layer, the anodic process of iron corrosion was stimulated in 1 N HCl, resulting in a moderate inhibition efficiency.
doi_str_mv 10.1016/0010-938X(94)90065-5
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A protective film formed on the iron surface by the oxidative-addition reaction of the thiocyanate with iron was characterized using X-ray photo-electron and reflection Fourier Transform Infrared (FTIR) spectroscopy. A markedly high inhibition efficiency of this inhibitor was obtained for iron corrosion in 1 N HClO 4 at its high concentrations, as well as in H 2SO 4 previously reported, but not in 1 N HCl. Results of surface analyses suggested the formation of a protective layer composed of a ( η 3-benzyl) (thiocyanato) iron (II) complex on the surface in 1 N HClO 4. Since an unstable ( η 3-benzyl) (chloro) iron complex was formed in the layer, the anodic process of iron corrosion was stimulated in 1 N HCl, resulting in a moderate inhibition efficiency.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/0010-938X(94)90065-5</doi><tpages>9</tpages></addata></record>
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subjects Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
title Electrochemical and spectroscopic studies on inhibition mechanism of benzyl thiocyanate for iron corrosion in 1 N perchloric and hydrochloric acid solutions
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