Abstract
The syntheses and characterisation of Rare-Earth-Metals (REMs) complexes, via the use of green organic esters such as Pyridinecarboxylate (Pyc) and hydroxylnaphthoate (Hnp) to form stable compounds ie. Lanthanide-hydroxylnaphthanote (Ln-Hnp), has been demonstrated to be the most preferred compounds to form a good protective-film over steel-alloys. The electrochemical techniques of Linear Polarisation Resistance (LPR) and Cyclic-Potentiodynamic Polarisation (CPP) used in the studies demonstrated strong protective properties to the steel-alloys from the E corr-potential and 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. The data has also confirmed that the Ln-Hnp complexes clearly displayed a mixed-type of protective function. Thus, the overall metal dissolution rate of steel alloys is mitigated and the data also indicated that it has shown a healing mechanistic process building a dense molecular composite-films up to 5-micron thick when alloy-coupons were immersed into the solution containing REMs complexes. The characterisation of in-situ treated surfaces by the use of ATR-FTIR, FTIR-mapping-microscopy and Raman spectrum revealed its overall protective characteristic which were discussed in this paper.
D. T. C. Ang—On-Time Engineering Consultant.
P. Junk—Nevitt Prof. of Chemistry.
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Acknowledgement
The author greatly appreciates Prof. Peter Junk, Prof. Glen Deacon and Prof. Maria Forsyth for their guidance and assistance rendered during the entire work of my study.
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Ang, D.T.C., Junk, P., Deacon, G., Forsyth, M. (2022). Electrochemistry and Engineering Study of Molecular Protective-Films to Steel-Alloys. In: Wei, Y., Chng, S. (eds) Proceedings of the 2nd International Conference on Advanced Surface Enhancement (INCASE 2021). INCASE 2021. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-5763-4_26
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