A newly synthesized (carbamothiol) oxalamide derivative N1, N2-bis (2-(((2-((2 aminoethyl) amino) ethyl) amino) ethanethioyl) oxalamide (bis N), was investigated for its ability to suppress corrosion of copper in 3.5% NaCl. The chemical structure was demonstrated using FT-IR, 1 H-NMR, and 13 C-NMR. According to weight loss (WL), potentiodynamic polarization (PDF), and electrochemical impedance spectroscopy (EIS) techniques, the synthetic inhibitor exhibits higher corrosion inhibition efficiency. The corrosion rate decreases and the inhibition efficiency increases linearly with the concentration of inhibitor, reaching 93.3% at 0.01M. The adsorption of bis N obeys the Langmuir adsorption isotherm. The calculated adsorption isotherm parameter ∆Gads is a negative value equals to-10.14 KJ/mol, suggesting that the bis N is adsorbed on the copper surface and achieves the spontaneous process. The efficiency of bis N for metal protection enhancement is assessed using density functional theory (DFT). Evaluation and discussion of quantum different descriptors are also included.
This paper is a part from a running project aiming at optimizing the permanganate coating treat ment for rare earth (RE) containing magnesium alloys. Alloying of Mg alloys with RE elements enhances the galvanic corrosion and decreases the overall resistance. The objective of this paper is to optimize the perman ganate treatment time that can provide the highest protection, so that permanganate coating can be engi neered for Mg alloys. Electrochemical characteristics, morphology, and microstructure examination were investigated as a function of permanganate treatment time. EIS and polarization testing correlated to macro and microscopic surface examinations and visual inspection. Taking into account the industrial applicability and the economic aspects, the optimum treatment time was determined to be 10 min and this value is critical where increasing or decreasing it has a detrimental effect on the overall performance. Accordingly, processes active during permanganate treatment are kinetically dependent and strongly influenced by the treatment time.
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