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Electrochemical Engineering Study of Heteroaromatic Molecular Protective-films to Metal-Alloys

Volume 7, Issue 3, June 2022    |    PP. 44-57    |PDF (751 K)|    Pub. Date: September 12, 2022
DOI: 10.54647/dee47284    7 Downloads     71 Views  

Author(s)
Desmond TC Ang, On-Time Engrg Consultant, Singapore, URL:https://www.linkedin.com/t-c-desmond-ang-march6
Peter Junk, Nevitt Prof. of Chemistry, College of Sci & Engrg, James Cook's University, Townville, Qld 4811, Australia
Glen Deacon, Monash University, School of Chemistry, Clayton, VIC 3800, Australia
Maria Forsyth, Monash University, School of Chemistry, Clayton, VIC 3800, Australia

Abstract
The syntheses and characterisation of Rare-Earth-Metals (REMs) heteroaromatic complexes, via the use of green organic esters such as Pyridinecarboxylate (Pyc) or heteroaromatic organic to form stable compounds ie. Lanthanide-Pyridinecarboxylate (Ln-Pyc), has been demonstrated to be one of the preferred compounds to form a good protective-film over metal-alloys. The electrochemical techniques of Linear Polarisation Resistance (LPR) and Cyclic-Potentiodynamic Polarisation (CPP) used in the studies demonstrated strong protective properties to the metal-alloys from the E corr-potential and the I corr-current. This is because the I corr-current was reduced by many folds when coupons were immersed in NaCl (0.01M) as a control bulk-electrolyte containing Ln-Pyc complexes. The data has also confirmed that the Ln-Pyc complexes clearly displayed a mixed-type of protective function. Thus, the overall metal dissolution rate of metallic alloys is mitigated and also indicated a healing mechanistic process involves in building a dense molecular composite-films, when the alloy-coupons were immersed into the solution containing REMs complexes. The characterisation of in-situ treated surfaces via the use of ATR-FTIR, FTIR-microscopy spectrum revealed the overall protective characteristics were discussed in this paper.

Keywords
Rare Earth Metals (REMs), Ligands, Heteroaromatic organics, Pyridine, Coordination Chemistry, Electrochemistry, Corrosion.

Cite this paper
Desmond TC Ang, Peter Junk, Glen Deacon, Maria Forsyth, Electrochemical Engineering Study of Heteroaromatic Molecular Protective-films to Metal-Alloys, SCIREA Journal of Electrical Engineering. Vol. 7 , No. 3 , 2022 , pp. 44 - 57 . https://doi.org/10.54647/dee47284

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