Naslov
Passive Films on 90Cu-10Ni Alloy : The Mechanism of Breakdown in Chloride Containing Solutions

Autori
Milošev, Ingrid ; Metikoš-Huković, Mirjana

Izvornik
Journal of the Electrochemical Society (0013-4651) 138 (1991), 1; 61-67

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
90Cu-10Ni alloy; borate buffer; breakdown; pitting corrosion

Sažetak
The complex electrochemical behavior of 90Cu-10Ni alloy in borate buffer solutions containing chloride ions involvesCu oxide formation, passivity onset, and pitting corrosion. The nature of the processes occurring was studied using electrochemical techniques complemented with SEM and EDXA. The overall process can be described by two competingprocesses: formation and growth of the duplex oxide passive film and formation of the CuCl layer. The CuCl layer ispoorly protective and when the applied potential exceeds a certain critical value, pitting corrosion takes place. The changein both the kinetics and the morphology indicates that at least three stages should be distinguished in the pitting process:adsorption of Cl– ions, pit nucleation, and pit growth. The physical interpretation of the proposed model of passive filmbreakdown is consistent with its duplex structure, and is discussed in terms of the various conditions leading to nucleation and growth of pits. Experimental kinetic parameters of the passive film breakdown are presented.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA