2M hydrochloric acid solution was used and the methods of polarization and weight loss measurements were adopted.The two methods give the same order of inhibition efficiency.Polarization studies reveal that catholic p...2M hydrochloric acid solution was used and the methods of polarization and weight loss measurements were adopted.The two methods give the same order of inhibition efficiency.Polarization studies reveal that catholic polarization is more pronounced than the anodic one.The results indicate that all the studied compounds excellent corrosion inhibitors and the percentage efficiency varying with both the type and concentration of the inhibitor and being in the following order:p-methoxy-benzaldehyde(1)benzaldehyde(2)p-chlorobenzaldehyde(3)p-nitrobenzaldehyde(4).The degree of surface coverage of the adsorbed additives was determined and the results obey the Langmuir isotherm.Effect of temperature on the corrosion rate in absence and presence of different concentrations of the used inhibitors was investigated by using weight loss measurements.The results indicate that the corrosion rate rapidly increases with increasing temperature.(Edited author abstract)19 Refs.展开更多
Electrochemical and corrosion behaviour of reinforced steel embedded in cement pastes incorporating different amounts of silica fume as a partial replacement of cement has been studied in chloride and sulphate solutio...Electrochemical and corrosion behaviour of reinforced steel embedded in cement pastes incorporating different amounts of silica fume as a partial replacement of cement has been studied in chloride and sulphate solutions by using different electrochemical techniques. The results indicate that, while steel passivity degree is low in the control samples' upon soaking in the corrosive media, it has been high in samples incorporating silica fume and increased with increasing silica fume content. The improvement effect of silica fume may be attributed to the pore solution structure of the cement paste, which limits the mobility of aggressive ions near the surface of the steel. The mechanism of steel corrosion due to chloride and sulphate attack and passivation effect of silica fume are discussed.展开更多
Corrosion and electrochemical behaviour of reinforcing steel embedded in cement pastes with and without concrete admixtures used in Egypt to modify concrete properties have been studied.The influence of the admixtures...Corrosion and electrochemical behaviour of reinforcing steel embedded in cement pastes with and without concrete admixtures used in Egypt to modify concrete properties have been studied.The influence of the admixtures on the corrosion resistance of the steel against chloride attack has been studied by using impressed current and impressed voltage techniques.The results indicate that the type and concentration of the used admixture have an important effect on the extent of chloride induced corrosion of the steel.The mechanism of corrosion of steel due to chloride attack was discussed.(Edited author abstract)16 Refs.展开更多
Electrochemical behaviour of stainless steel type 430 in acidic solutions of methanol, ethanol and in their binary mixtures with water (from 0 to 100% alcohol) at 25℃ has been studied. using potentiostatic poIarizati...Electrochemical behaviour of stainless steel type 430 in acidic solutions of methanol, ethanol and in their binary mixtures with water (from 0 to 100% alcohol) at 25℃ has been studied. using potentiostatic poIarization technique and weight loss method. It was found that the corrosion rate of the metal was affected by the physico-chemical properties of the media such as, viscosity, state of solvation, molar volume contraction, proton availability and dielectric constant, it was demonstrated from the potentiostatic study that the active passive transition strongly depended on the concentration of the acid, and on the water content of the media.展开更多
文摘2M hydrochloric acid solution was used and the methods of polarization and weight loss measurements were adopted.The two methods give the same order of inhibition efficiency.Polarization studies reveal that catholic polarization is more pronounced than the anodic one.The results indicate that all the studied compounds excellent corrosion inhibitors and the percentage efficiency varying with both the type and concentration of the inhibitor and being in the following order:p-methoxy-benzaldehyde(1)benzaldehyde(2)p-chlorobenzaldehyde(3)p-nitrobenzaldehyde(4).The degree of surface coverage of the adsorbed additives was determined and the results obey the Langmuir isotherm.Effect of temperature on the corrosion rate in absence and presence of different concentrations of the used inhibitors was investigated by using weight loss measurements.The results indicate that the corrosion rate rapidly increases with increasing temperature.(Edited author abstract)19 Refs.
文摘Electrochemical and corrosion behaviour of reinforced steel embedded in cement pastes incorporating different amounts of silica fume as a partial replacement of cement has been studied in chloride and sulphate solutions by using different electrochemical techniques. The results indicate that, while steel passivity degree is low in the control samples' upon soaking in the corrosive media, it has been high in samples incorporating silica fume and increased with increasing silica fume content. The improvement effect of silica fume may be attributed to the pore solution structure of the cement paste, which limits the mobility of aggressive ions near the surface of the steel. The mechanism of steel corrosion due to chloride and sulphate attack and passivation effect of silica fume are discussed.
文摘Corrosion and electrochemical behaviour of reinforcing steel embedded in cement pastes with and without concrete admixtures used in Egypt to modify concrete properties have been studied.The influence of the admixtures on the corrosion resistance of the steel against chloride attack has been studied by using impressed current and impressed voltage techniques.The results indicate that the type and concentration of the used admixture have an important effect on the extent of chloride induced corrosion of the steel.The mechanism of corrosion of steel due to chloride attack was discussed.(Edited author abstract)16 Refs.
文摘Electrochemical behaviour of stainless steel type 430 in acidic solutions of methanol, ethanol and in their binary mixtures with water (from 0 to 100% alcohol) at 25℃ has been studied. using potentiostatic poIarization technique and weight loss method. It was found that the corrosion rate of the metal was affected by the physico-chemical properties of the media such as, viscosity, state of solvation, molar volume contraction, proton availability and dielectric constant, it was demonstrated from the potentiostatic study that the active passive transition strongly depended on the concentration of the acid, and on the water content of the media.
