A.A. Abdel Fattah

• Benha University

The inhibitive effect of polymeric surfactants on the corrosion of carbon steel in 0.5M HCl has been investigated by weight loss and polarization techniques. Potentiodynamic polarization measurements showed that these compounds are mixed type inhibitors. The adsorption of these inhibitors on carbon steel surface obeys Langmuir adsorption isotherm....

The inhibitive effect of polymeric surfactants on the corrosion of carbon steel in 0.5M HCl has been investigated by weight loss and polarization techniques. Potentiodynamic polarization measurements showed that these compounds are mixed type inhibitors. The adsorption of these inhibitors on carbon steel surface obeys Langmuir adsorption isotherm....

Physicochemical properties of polyethyleneglycol 8000 (PEG8) and polyethylene glycol 12000 (PEG12) were investigated by means of inverse gas chromatography (IGC) using different groups of solutes as the probes with a different chemical nature were used as eluents. Where the polymers were used as a stationary phases in the chromatographic column. So...

The inhibitive effect of rice bran oil components ( fatty acids, dewaxed oil and wax) on the corrosion of copper in 1 M HCl has been investigated by weight loss and polarization techniques. Potentiodynamic polarization measurement showed that these compounds are mixed-type inhibitors. The adsorption of these inhibitors on copper surface obeys Langm...

The corrosion behavior of nickel, Inconel 600, and Inconel 690 in different concentrations of HCl solutions and its inhibition by clove oil was studied using potentiostatic polarization measurements. As the acid concentration increases, the rate of corrosion increases, indicating that HCl accelerates the dissolution of nickel and its alloys. The in...

Summary Barium-137m radioisotope generator of the chromatographic column elution mode based on loading 1.5 g 6-tungstocerate(IV) gel matrix with ~54 kBq of fission-produced 137Cs is described. The elution performance of the generated 137mBa radionuclide was investigated as a function of chemical composition of the eluent, flow rate, elution frequen...

The construction and general performance of thirteen new polymeric membrane sensors for the determination of fexofenadine hydrochloride based on its ion exchange with reineckate, tetraphenylborate and tetraiodomercurate have been studied. The effects of membrane composition, type of plasticizer, pH value of sample solution and concentration of the...

Studies were carried out on aluminium in acid solutions using ethoxylated fatty acids, derivatives of benzaldehyde and derivatives of phenanthroline. The corrosion rates were correlated with Hammett constants.

The electrochemical behaviour of some azo compounds of 4-aminoanti-pyrine derivatives (I-V) have been studied in ethanolic buffered solutions using tost polarography (DC sampled mode), linear sweep and cyclic voltam-mograms. Generally, the reduction polarograms of these compounds show a single, 4-electrons diffusion controlled irreversible wave wit...

Several mixed ZnO-Al2O3 systems were prepared by the impregnation method and calcined for 5 h at 300, 600 and 1000 ° C. The crystal structure, surface acidity, surface basicity, surface area, catalytic decomposition of H2O2 and the electrical conductivity of the samples prepared were studied. It was found that the decomposition of H2O2 is catalysed...

The cyclic voltammograms of a manganese electrode are traced in NaOH solutions as a function of electrolyte concentration, voltage scanning rate and electrode reactivation by cyclic polarization. Both potential and current densities of the active, passive and transpassive region are affected by the voltage scanning rate. The electrochemical reactio...

The kinetics of formation of barium titanate from banum carbonate and titanium dioxide have been studied using isothermal and dynamic thermogravimetry techniques. Kinetic analysis of the isothermal data, considered from the point of view of various solid state reaction models, showed that the reaction is best described by the random nucleation Avra...

The time-potential curves of manganese electrodes in oxygenated solutions of PO43-, HPO42- and H2PO4- anion of different concentrations are constructed. Also the critical current densities for passivation of Mn electrodes are determined. Both indicate that promotion or inhibition of the corrosion of Mn depends on the type and concentration of the p...

A model cell was used to determine the variation of pitting corrosion currents of electrolytically pure iron in a variety of inorganic inhibiting solutions in the presence of aggressives Cl** minus , Br** minus and I** minus ions. Data regarding the dependence of these currents on the type and concentration of aggressive and inhibiting agents were...

The corrosion behaviour of zinc in solutions of the sodium salts of formate, acetate, propionate, citrate, tartrate, oxalate or benzoate anions was studied by determining the steady state potentials. The first five anions behave unifunctionally, promoting the corrosion of zinc. The extent to which corrosion is promoted depends on the type, the conc...

The inhibition of corrosion of mild steel in 0. 05 N HCl by non-ionic surfactants of the polyethylene oxide-fatty acid condensate type was studied using the weight loss technique at 70 degree C. The percentage inhibition (PI) increased with the increase of additive concentration up to values comparable with the CMC (critical micelle concentration)...

Cyclic voltammograms of the tin electrode were constructed in NaOH solutions as a function of electrolyte bulk concentration, starting potential and scanning rate and range. The cyclic voltammograms are characterized by five anodic regions and one cathodic peak, which correspond successively to: oxidation of Sn to Sn(OH)//2 or SnO, oxidation of Sn(...

Potentiodynamic anodic polarization curves were constructed for a Zn electrode in 0 multiplied by (times) 01, 0 multiplied by (times) 05 and 0 multiplied by (times) 1 M NaOH solutions containing different additions of Cl** minus ions. The critical pitting potential varies with the logarithm of Cl** minus ion concentration according to sigmoidal S-s...

Up to a certain concentration, Cl− ions have no influence on the passive state of nickel in HNO3 and NaOH media. However, higher aggressive ion concentrations cause destruction of passivity and initiation of visible pits. The change in integrated anodic charge, δqa, is taken as a measure of the extent of pitting. The latter varies linearly with log...