Molecular structures in the inorganic-metal interactions for optimizing electrochemical performance
By Zoubi, Wail Al; Putri, Rosy Amalia Kurnia; Sunghun, Baeki; Ko, Young Gun
Published in Journal of Molecular Liquids
2021
Abstract
Plasma-assisted electrochemical reactions (PAE) on the metal surface of light metals were studied via low temperature-interfacial plasma electrolysis (LT-PE) in the presence of nitrogen-containing organic compounds. The surface treatment was achieved in a silicate-based electrolyte, having Melamine (MEL), adenine (AD), and N.N.N′.N′-tetramethylenediamine (TEMD), which might act as an oxygen scavenger and as metal ions-acceptors during the plasma-assisted electrochemical reaction. The existence of MEL and TEMD working as the donor of nitrogen and carbon would boost the fabrication of magnesium silicate and magnesium oxide in the inorganic layer, resulting in outstanding compactness of the inorganic film to that when AD, having several tautomers, was acted as acceptor-type ions since the formation of stable organic complexes was preferred in the electrolyte solution with AD. The porosity of the inorganic layer formed by AD was higher than MEL and TEMD due to the adenine hydrogen bonding between AD molecules. The finding in this work indicates that the corrosion protective action was remarkably improved in the order of TEMD, MEL, and AD, which was discussed on the basis of potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) interpretations.