RT info:eu-repo/semantics/article
T1 Uses of scanning electrochemical microscopy for the characterization of thin inhibitor films on reactive metals: the protection of copper surfaces by benzotriazole
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Santana, Juan José
A1 González, Sergio
K1 Corrosion inhibition
K1 Copper
K1 Benzotriazole
K1 Scanning electrochemical microscopy
AB Scanning electrochemical microscopy (SECM) was used to study the film formation ofbenzotriazole towards corrosion of copper. SECM was operated in the feedback modeby using ferrocene-methanol as redox mediator, and the sample was left unbiased at alltimes to freely attain its open circuit potential in the test environment. Followingexposure to aggressive electrolytes the anticorrosion abilities of the layers werecharacterised by image analysis and by an electrochemical method derived from theexperimental approach curves. Changes in the shape of the approach curves wereclearly observed during the inhibitor film formation process. They showed the transitionfrom an active conducting behaviour towards ferrocinium reoxidation typical ofunprotected copper, to a surface exhibiting insulating characteristics when the metal wascovered by a surface film containing the inhibitor. This supports that SECM is apractical technique in the investigation of corrosion inhibitor performance. However, aconsistent tendency for the characterization of inhibitor film formation using SECMmeasurements in the positive feedback mode for the copper-benzotriazole system wasonly found when the experiments were conducted when the inhibitor molecule was notpresent in the test solution. That is, inhibitor molecules were found to interact not onlywith the copper surface during the monitoring process, but to interact with the SECMtip as well, this effect being significantly enhanced when chloride ions were present inthe electrolyte. Finally, a procedure to image the chemical activity of copper surfacespartially covered with the inhibitor film with SECM is proposed
YR 2010
FD 2010
LK http://riull.ull.es/xmlui/handle/915/19113
UL http://riull.ull.es/xmlui/handle/915/19113
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 27-dic-2024