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| THE RELATIONSHIP OF CORROSION INHIBITION EFFICIENCY ON STEEL IN ACIDS WITH ELECTRON DENSITY AND THE ENERGY OF FRONTIAL ORBITAL OF IMIDAZOLINE DERIVATIVS |
| Ning Shiguang Shi Mingli Liu Fengling Yu Lixin (Shandong Normal University)Li Yanfang Zhang Rongling Cheng Zaiying (Shandong Polytechnic University) |
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Abstract The inhibition efficiency of imidazoline derivatives containing N,Sor O for steel in hydrofluoric acid,hydrochloric acid and citric acid was studied.The electron density of various atoms and the energy of HOMO, LUMO in the molecules are computed by CNDO/2 method. The experimental results shown that the inhibition efficiency decreases in the following order:2-undecyl-1-(trithioureido)-ethyl-imidazoline (SM-3)>2-undecyl-1-(dithioureido)-ethyl-imidazoline(SM 2)>2- undeeyl-1-(monothioureido)-ethyl-imidazoline(SM-1)>2-undecyl-1- (carboxyethylthioureido)-ethyl-imidazoline(PSM-1)>2-undecyl-1- (carboxyethyl-amino)-ethyl-imidazolne(pAI)>2 undecyl-1-(mul eylamido)-ethyl-imidazo line(MAI)>2-unecyl-1-(aminoethyl)- imidazoline(UAEI). The inhibition efficiency of SM-2 at diffierent concentrations and temperates in 0.166 mol/L citric acid for 20A steel agrees well with Arrhenius formula,i.e.P=A exp(-E/RT),where P is the efficiency of corrosion inhibition and T,the temperature(K).This indicates that the mechanism of corrosion inhibition of SM-type inhibitors is chemical adsorption on the metal surface. The chemical adsorption of SM-type inhibitors on metal surface is explained with computational results by CNDO/2 method.In the mol- ecules of SM-type inhibitors,there are two unsaturated centres:the π-bond on the imidazoline-ring and on the thiourea group.These two centres form feed-back bonds on metal surface with a result of chief donative effect of electron.
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Received: 25 August 1990
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Cite this article:
Ning Shiguang Shi Mingli Liu Fengling Yu Lixin (Shandong Normal University)Li Yanfang Zhang Rongling Cheng Zaiying (Shandong Polytechnic University). THE RELATIONSHIP OF CORROSION INHIBITION EFFICIENCY ON STEEL IN ACIDS WITH ELECTRON DENSITY AND THE ENERGY OF FRONTIAL ORBITAL OF IMIDAZOLINE DERIVATIVS. J Chin Soc Corr Pro, 1990, 10(4): 383-390.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1990/V10/I4/383
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