RT info:eu-repo/semantics/article
T1 In situ monitoring of the electrochemical reactivity of aluminium alloy AA6060 using the scanning vibrating electrode technique
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Fernández Pérez, Bibiana María
A1 Santana, Juan José
A1 González, Sergio
K1 scanning microelectrochemical techniques
K1 SVET
K1 distribution of interfacial electrochemical activity
K1 localized corrosion
K1 aluminium alloy
K1 intermetallic particles
AB Localized electrochemical activation of aluminium alloy AA6060 surfaces during immersion in chloride-containing aqueous solution has been characterised using the scanning vibrating electrode technique (SVET). Ionic current flows in the electrolyte phase adjacent to corroding microcells are imaged in situ, allowing their evolution with time to be monitored with spatial resolution. A heterogeneous response due to the presence of intermetallic inclusions in the material is found on AA6060 surfaces. The highly localized anodic activity was thus detected, which has been interpreted as a result of the galvanic coupling between the matrix and the intermetallic particles. Metallic inclusions behave cathodically whereas the aluminium matrix undergoes metal dissolution due to the activation of anodic sites in the proximity of those inclusions. Hydrolysis of aluminium ions leads to local acidification of the electrolyte adjacent to the anodic sites, and it is accompanied by hydrogen evolution
YR 2014
FD 2014
LK http://riull.ull.es/xmlui/handle/915/19097
UL http://riull.ull.es/xmlui/handle/915/19097
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 18-nov-2024