| Title: | An effect of sodium dodecylsulfate on the corrosion of copper in sulphuric acid media |
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| Authors: | ID Fuchs-Godec, Regina (Author)
ID Doleček, Valter (Author) |
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| Files: |  http://dx.doi.org/10.1016/j.colsurfa.2004.05.015
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | The effect of sodium dodecylsulfate (SDS) on copper corrosion in a solution of 0.5 M H2SO4 + x M SDS was studied using electrochemical polarisation measurements. The critical micelle concentration (CMC) of SDS in 0.5 M H2SO4 is 8 * 10-4 M, and the experimental concentrations of SDS were in the range below and above the CMC. It was found that SDS is a good anodic inhibitor at lower anodic overpotentials, i.e. very close to the rest potential. Adsorptionof the inhibitor obeys the Langmuir isotherm. Plots of log [▫$theta$▫/(1-▫$theta$▫)] versus log ▫$c_{inh}$▫ yielded straight lines with a slope change at the CMC. Accordingly, the CMC could be determined from these electrochemical measurements. The values of ▫$Delta$▫▫$G_{ads}$▫ calculated from the Langmuir plots are negative, suggesting that the inhibitive action of SDS in 0.5 M H2SO4 results from the electrostatic adsorption of C12H25SO4- ions onto the positively charged copper surface. |
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| Keywords: | electrochemistry, corrosion inhibitors, surfactants, potentiodynamic polarisation, corrosion kinetic parameters, copper, Langmuir isotherm, critical micelle concentration, sulphuric acid |
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| Year of publishing: | 2004 |
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| PID: | 20.500.12556/DKUM-27529  |
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| UDC: | 541.183 |
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| ISSN on article: | 0927-7757 |
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| COBISS.SI-ID: | 8985110 |
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| NUK URN: | URN:SI:UM:DK:FCW2LLKG |
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| Publication date in DKUM: | 01.06.2012 |
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| Views: | 2065 |
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| Downloads: | 113 |
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| Metadata: |    |
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| Categories: | Misc.
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