Formation of Surface Layers upon Evaporation of meso-Tetra(benzo-15-crown-5)porphyrin on Nanostructured Iron Surfaces

V. A. Kotenev, D. N. Tyurin, A. Yu. Tsivadze, A. Yu. Chernyad’ev, N. P. Sokolova,
A. M. Gorbunov, and T. P. Puryaeva

Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia

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Abstract — Morphology and spectral characteristics of the surface structures obtained upon the evaporation of meso-tetra(benzo-15-crown-5)porphyrin on the iron surface are studied with the use of digital optical microsopy, IR Fourier-transform spectroscopy, and x-ray diffraction analysis. During the interaction of porphyrin chloroform solution with nanostructured iron-based metal–oxide nanocomposite template, the process at the original template boundary is shown to initiate the formation of two polymorphous modifications of a porphyrin layer, namely, the aggregated layer and a transparent vitreous layer.

Electrochemical Polymerization of Aniline on Aluminum Electrode from an Oxalic Acid and H₂SO₄ Solutions¹

A. Buyuksagis

Afyon Kocatepe University Science and Art Faculty, Afyonkarahisar, TURKEY

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Received January 11, 2008

Abstract — In this study, the polymerization of aniline on Al and Pt electrode was examined by cyclic voltammetry There had been reversible reaction on Al electrode. But on the other hand there had been irreversible reaction on Pt electrode. The addition of aniline into the solution led the decrease of current values. The current decreased by adsorption of anodic products on polymer surface. The fact that the anodic peak potential shifted to positive value shows that polyaniline (PANI) catalyzed the formation of polymer. This case shows that the aniline shifted the electrode potential to positive side by the adsorption on the surface. When Al electrode covered with polymer (in 50 mV s^–1 potential scanning rate after 20 cycles) was immersed into 1 N HCl solution, the inorganic layer decomposed on the metal surface. This led to decrease the polarization resistance of the metal. SEM microphotographs and EDX fingerprints also confirmed these results.

The Corrosion Characterization of a Ferritic Stainless Steel with Mo Addition in H₂SO₄ and HCI Acid Solutions

H. Demiroren^a, M. Aksoy^b, T. Yildiz^a, S. Buytoz^a

^a University of Firat, Department of Metallurgy, Faculty of Technical Education, Elazig, Turkey

^b University of Firat, Department of Metallurgy and Material Engineering, Faculty of Engineering, Elazig, Turkey

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Received February 1, 2008

Abstract — The corrosion behavior of ferritic stainless steel containing 1 wt, % Mo was investigated using an AC impedance technique and the mass loss method. The alloys were produced by casting and forging. They were classified into three groups: unhomogenized, homogenized for 30 minutes and homogenized for 180 minutes. Mass loss tests were carried out on samples homogenized for 180 minutes. The corrosion tests were performed in 0.1 M H₂SO₄ and 0.3 M HCl acid solutions. SEM investigations were performed on the surface of samples exposed to corrosion for 30 and 360 minutes. The results were compared with results obtained from experiments performed on unalloyed ferritic stainless steel. Molybdenum (Mo) and homogenization heat treatment were found to have a beneficial effect on corrosion behavior of ferritic stainless steel in these solutions.

Corrosion Inhibition of Aluminum 6063 Using Some Pharmaceutical Compounds¹

A. S. Fouda^a, A. A. Al-Sarawy^b, F. Sh. Ahmed^c, and H. M. El-Abbasy^a

^a Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura-35516, EGYPT

^b Department of Chemistry, Faculty of Engineering, El-Mansoura University, El-Mansoura, EGYPT

^c Department of Chemistry, Faculty of Science (Demitta), El-Mansoura University, El-Mansoura, EGYPT

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Received April 6, 2009

Abstract — The corrosion inhibition characteristics of some pharmaceutical compounds on aluminium 6063 in 0.5 mol l^–1 H₃PO₄ has been studied using weight loss and galvanostatic polarization techniques. Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. The inhibition efficiency increased with increasing inhibitor concentration, but decreased with increasing temperature. The adsorption of first group pharmaceutical compounds on the metal surface is found to obey Frumkin’s adsorption isotherm, but the adsorption of second group pharmaceutical compounds is found to obey Temkin’s adsorption isotherm. Thermodynamic parameters for adsorption process were determined. Galvanostatic polarization studies showed that first and second groups' pharmaceutical compounds are mixed-type inhibitors and the results obtained from the two techniques are in good agreement.