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Singapore, Singapore

An electrochemically integrated multi-electrode array namely the wire beam electrode (WBE) has been used to characterize the behavior of cerium chloride (CeCl3) and lanthanum chloride (LaCl3) in inhibiting localized corrosion of AA2024-T3 and AA1100. CeCl3 has been found to inhibit AA2024-T3 corrosion in 0.005 M sodium chloride (NaCl) solution by suppressing galvanic corrosion activities and by creating a large number of insignificant anodes. It has also been shown to inhibit localized corrosion of AA1100 in 0.5 M NaCl solution by promoting the random distribution of minor anodes. LaCl3 has been found to inhibit localized corrosion of AA2024-T3 at 1000 ppm, although its efficiency dropped significantly when its concentration decreased to 500 ppm. The addition of CeCl3 and LaCl3 to corrosion testing cells at later stages was unable to effectively suppress existing corrosion anodes. © 2013 The Electrochemical Society. Source


Tan Y.,Deakin University | Liu T.,Singapore Test Services Pte. Ltd.
Corrosion Engineering Science and Technology | Year: 2014

Electrochemical parameters including maximum anodic current density, total anodic current density, the number of anodic sites and the localised corrosion intensity index have been extracted from galvanic current distribution maps that were acquired using an electrochemically integrated multielectrode array, namely, the wire beam electrode. Experiments have been carried out to demonstrate the application of these new electrochemical parameters for characterising localised corrosion inhibition of metals. A typical corrosion inhibitor, potassium dichromate, was found to affect localised corrosion processes in various ways, for instance in sodium chloride solutions, it was found to inhibit localised corrosion of aluminium alloy AA 2024-T3 by suppressing galvanic corrosion activities occurring over the alloy surface, whereas it was found to control localised corrosion of AA 1100 by creating a large number of minor anodes distributing randomly over the metal surface. © 2014 Institute of Materials, Minerals and Mining. Source


Tan Y.,Deakin University | Aung N.N.,West Virginia University | Liu T.,Singapore Test Services Pte. Ltd.
Corrosion Science | Year: 2012

The intensity of localised corrosion of steel in the Evans solution has been evaluated by means of an electrochemically integrated multi-electrode array namely the wire beam electrode. A new parameter namely the localised corrosion intensity index (LCII) has been employed to quantify the degree of localisation of corrosion and the effect of pH alteration on the intensity of localised corrosion. A major variation in the LCII has been found to indicate a change in corrosion mechanism. In a typical experiment, the LCII dropped dramatically from approximately 1 to 0.02 when a pH modifier was added to the Evans solution, leading to the change of corrosion mechanism from highly localised pitting corrosion to general or uniform corrosion. © 2012 Elsevier Ltd. Source

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