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Effect of the nature of counterions of N-alkyl quaternary ammonium salts on inhibition of the corrosion processFuchs-Godec, ReginaElectrochemical measurements were performed to investigate the effectiveness of cationic surfactants of the N-alkyl quaternary ammonium salt type with different counterions and different chain ... lengths, as corrosion inhibitors forferritic stainless steel type X4Cr13 in 2 M H2SO4 solution. Two of them were single-chained surfactants and the other two were composed of three C8 alkyl-chains. The chosen cationic surfactants were myristyltrimethylammonium chloride (MTACl), myristyltrimethylammonium bromide (MTABr), trioctylmethylammonium chloride (TOMACl and trioctylmethylammonium bromide (TOMABr). Potentiodynamic polarisation measurements showed that these surfactants hinder both anodic and cathodic processes, i.e. they act as mixed-type inhibitors. It was found that the adsorption of the nalkyl ammoniumion in 2 M H2SO4 solution is in accordance with the Langmuir adsorption isotherm. Plots of log [fĆ/(1 ]fĆ)] vs. log cinch yielded straight lines with a slope which drastically changed at the CMC values of used surfactants. The plot of log fĆ vs. log cinh confirms the four-region f reverse orientation model of adsorption, suggested by Somasundaran and Fuerstenau. In region IV, where the formation of a multilayer is in progress, it is supposed that two different multilayers formed on metal surface in the case of TOMABr and MTABr. The influence of added ]CH2 groups (chain length) on the inhibition efficiency is greater than the influence of different counterions.Vir: Acta chimica slovenica. - ISSN 1318-0207 (Vol. 54, 3, 2007, str. 492-502)Vrsta gradiva - članek, sestavni delLeto - 2007Jezik - angleškiCOBISS.SI-ID - 11695638
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Fuchs-Godec, Regina | 08762 |
Vir: Osebne bibliografije
in: SICRIS
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