Journal
METALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/met11111861
Keywords
corrosion inhibitor; copper; thiazolidinedione; EIS; Potentiodyamic polarization; AFM
Funding
- King Khalid University [R.G.P.2/56/42]
- National Research Foundation (NRF) of Korea - Ministry of Science, ICT and Future Planning [2015R1A5A1037548]
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Two thiazolidinedione derivatives were synthesized and applied for corrosion protection of copper in NaCl medium. The inhibitors significantly limited the dissolution of copper, with ATZD slightly outperforming MTZD due to the presence of an additional -C3H5 unit in its molecular scaffold.
Copper is the third-most-produced metal globally due to its exceptional mechanical and thermal properties, among others. However, it suffers serious dissolution issues when exposed to corrosive mediums. Herein, two thiazolidinedione derivatives, namely, (Z)-5-(4-methylbenzylidene)thiazolidine-2,4-dione (MTZD) and (Z)-3-allyl-5-(4-methylbenzylidene)thiazolidine-2,4-dione (ATZD), were synthesized and applied for corrosion protection of copper in 3.5 wt.% NaCl medium. The corrosion inhibition performance of tested compounds was evaluated at different experimental conditions using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PPC) and atomic force microscopy (AFM). EIS results revealed that the addition of studied inhibitors limited the dissolution of copper in NaCl solution, leading to a high polarization resistance compared with the blank solution. In addition, PPC suggested that tested compounds had a mixed-type effect, decreasing anodic and cathodic corrosion reactions. Moreover, surface characterization by AFM indicated a significant decrease in surface roughness of copper after the addition of inhibitors. Outcomes from the present study suggest that ATZD (IE% = 96%) outperforms MTZD (IE% = 90%) slightly, due to the presence of additional -C3H5 unit (-CH2-CH = CH2) in the molecular scaffold of MTZD.
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