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Behavior of Al-Ga alloy on the negative side of the open – circuit potential in sodium chloride solution


Višekruna, Antonija; Radošević, Jagoda; Slavica Matešić, Sanja; Krnić, Nikša
Behavior of Al-Ga alloy on the negative side of the open – circuit potential in sodium chloride solution // 216th ECS Meeting Abstracts / The Electrochemical Society (ur.).
New Jersey: The Electrochemical Society, 2009. str. 1934-1934 (poster, međunarodna recenzija, sažetak, znanstveni)


Naslov
Behavior of Al-Ga alloy on the negative side of the open – circuit potential in sodium chloride solution

Autori
Višekruna, Antonija ; Radošević, Jagoda ; Slavica Matešić, Sanja ; Krnić, Nikša

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
216th ECS Meeting Abstracts / The Electrochemical Society - New Jersey : The Electrochemical Society, 2009, 1934-1934

Skup
216th ECS Meeting

Mjesto i datum
Vienna, Austrija, 4-9.10.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Aluminium activation; Al-Ga alloy; cathodic polarization

Sažetak
The influence of the addition of small quantities gallium to high – purity aluminum (99.999 wt. %) on its electrochemical behaviour at high cathodic potentials (up to -2.0 V), in 2 M NaCl solution was investigated using the potentiostatic pulse method. After cathodic polarization, anodic current was traced vs. time in order to determine the quantity of charge necessary for oxidation of substances formed. Anodic current responses to the return to the EOCP were also recorded in the period of 1s. Time responses of the cathodic and anodic current were analyzed. The cyclic voltametry method was used to determine hydration potential. The range of low and high cathodic potentials (LCP, HCP) was defined for all the samples. It has been established that the oxide film retains its properties in the LCP range, while in the HCP range cathodic breakdown and hydration of the oxide take place. The boundary between these two potential ranges shifts towards more negative potential values when the wt. % Ga in the alloy increases. Electrochemical methods complemented by SEM and EDAX analysis before and after the cathode pulse of -1.9 V. The results of change of potential in the negative direction with the alloy containing 0.2 wt. % Ga is superactivation of aluminum, as a consequence of a process agglomeration of high mobile atoms Ga on electrode surface.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo



POVEZANOST RADA


Projekt / tema
023-1252973-2243 - Elektrokemijski procesi na granici faza i fizikalna svojstva površina-ELGRAFAIII (Jagoda Radošević, )

Ustanove
Fakultet elektrotehnike, strojarstva i brodogradnje, Split