Regina Fuchs-Godec (Avtor), Valter Doleček (Avtor)

Povzetek

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.

Ključne besede

elektrokemija;korozijski inhibitorji;površinsko aktivne snovi;potenciodinamska polarizacija;baker;Langmuirjeva izoterma;kritična micelna koncentracija;korozijski kinetični parametri;žveplova (VI) kislina;electrochemistry;corrosion inhibitors;surfactants;potentiodynamic polarisation;corrosion kinetic parameters;copper;Langmuir isotherm;critical micelle concentration;sulphuric acid;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
UDK: 541.183
COBISS: 8985110 Povezava se bo odprla v novem oknu
ISSN: 0927-7757
Št. ogledov: 1366
Št. prenosov: 94
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: A effect of sodium dodecylsulfate on the corrosion of copper in sulphuric acid media
Sekundarne ključne besede: elektrokemija;korozijski inhibitorji;površinsko aktivne snovi;potenciodinamska polarizacija;baker;Langmuirjeva izoterma;kritična micelna koncentracija;korozijski kinetični parametri;žveplova (VI) kislina;
URN: URN:SI:UM:
Strani: str. 73-76
Letnik: ǂVol. ǂ244
Zvezek: ǂiss. ǂ1/3
Čas izdaje: Sep. 2004
ID: 8718711