Sensing polymer inhomogeneity in coated metals during the early stages of coating degradation

• Published in: Progress in organic coatings Vol. 74; no. 2; pp. 365 - 370
• Main Authors: Duarte, Raquel G., González, Sergio, Castela, Antonio S., Ferreira, Mário G.S., Souto, Ricardo M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2012
• Subjects: Lixiviation; Nickel; PVC; Scanning electrochemical microscopy; Topography; Water uptake; Scanning electrochemical microscopy; Water uptake; Lixiviation; Nickel; PVC; Topography
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2011.11.009

► Changes in the topography of coated metals exposed to aqueous environments are visualized by SECM. ► Topographic changes are due to transport processes at the coating/electrolyte interface. ► Water uptake, solution ion transport, and lixiviation through organic films are characterized. ► The extent of the transport processes varies with electrolyte composition. ► Species lixiviated from the coating film may modify the reactivity of the SECM tip. Negative-feedback scanning electrochemical microscopy (SECM) is successfully applied to visualize spatially resolved differences in the topography of coated metal samples upon exposure to aqueous electrolyte solutions of different composition. This method allows the investigation of the uptake of reactants from the electrolyte phase through the polymeric matrix to the metal/polymer interface to be performed even at early exposures. Yet, the method must be carefully checked to discard transport processes from the organic matrix into the solution phase, such as those related to lixiviation. In this later case, the topography of the polymer layer may evolve with time accordingly, not longer exclusively responding to the uptake by the polymer matrix of components from the electrolyte phase. Furthermore, lixiviated species may also react with the SECM tip, eventually leading to the continuous modification of the active surface area of the electrode during the measurements. In this work, the effect of lixiviation from a nickel foil coated with plasticized PVC (PVC Plastisol) on its topographic characterization by SECM was investigated.