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Thermodynamic,electrochemical and quantum chemical investigation of thiomorpholin-4-ylmethyl-phosphonic acid as corrosion inhibitor of Iron in sulphuric acid solution
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نویسنده
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elazhary i. ,el ayouchia h.b. ,laamari m.r. ,el haddad m. ,rafqah s. ,anane h. ,moubtassim m.l.e. ,stiriba s.-e.
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منبع
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journal of materials and environmental science - 2016 - دوره : 7 - شماره : 4 - صفحه:1252 -1266
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چکیده
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The inhibiting action of thiomorpholin-4-ylmethyl-phosphonic acid (tmpa) was investigated as the corrosion inhibitor of iron in 0.5m sulphuric acid (h2so4) solution with the aid of potentiodynamic polarization test,electrochemical impedance spectroscopy (eis) and weight loss measurements. the results revealed that thiomorpholin-4-ylmethyl-phosphonic acid (tmpa) is a good,mixed type inhibitor. the inhibition efficiency of tmpa on iron corrosion increases with increase in concentration of (h2so4) and decreases with increase in temperature. the adsorption isotherm model of tmpa on the iron surface was in conformity with langmuir isotherm model. thermodynamic parameters were calculated and discussed. the local reactivity,analyzed by using parr functions,shows that both sulphur and nitrogen atoms of tmpa are the main adsorption sites.
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کلیدواژه
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Inhibition; Iron; Local reactivity; Phosphonic acid; Sulphuric acid
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آدرس
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equipe de chimie analytique et environnement,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie moléculaire matériaux et modélisation,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie analytique et environnement,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie analytique et environnement,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie analytique et environnement,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie moléculaire matériaux et modélisation,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie moléculaire matériaux et modélisation,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi, Morocco, equipe de chimie moléculaire matériaux et modélisation,faculté polydisciplinaire,sidi bouzid,b.p. 4162,safi,morocco,instituto de ciencia molecular/icmol,universidad de valencia,c/ catedrático josé beltrán,2,valencia, Spain
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Authors
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