Abstract
Corrosion inhibitory effects of new synthesized compound namely 5,5’-((1Z,1’Z)-(1,4-phenylenebis(methanylylidene))bis(azanylylidene))bis(1,3,4-thiadiazole-2-thiol) (PBB) on mild steel in 1.0 M HCl was investigated at different temperatures using open circuit potential (OCP), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Results showed that PBB inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiencies increased with the concentration of inhibitor, but decreased proportionally with temperature. Changes in impedance parameters suggested the adsorption of PBB on the mild steel surface, leading to the formation of protective films.
Highlights
Corrosion is a common problem for steel and directly impacts its cost and safety [1]
The molecular design of the new PBB is based on the fact that 1,3,4-thiadizole containing imine, mercapto and sulfide would contribute more effectively towards inhibition of corrosion of mild steel in acid medium
The reaction sequence for synthesis of PBB is outlined in Scheme 1 was followed
Summary
Corrosion is a common problem for steel and directly impacts its cost and safety [1]. The majority of the well-known acid corrosion inhibitors are organic compounds that contain nitrogen, sulfur or oxygen atoms [2]. Many organic compounds have been studied to investigate their corrosion inhibition potential, e.g., the effect of organic nitrogen compounds on the corrosion behavior of iron and steel in acidic. Schiff bases are effective inhibitors for the corrosion of steel in acidic media [8]. Recent studies revealed that organic compounds containing polar functions groups would be quite efficient in minimizing the effect of corrosion in addition to heterocyclic compounds containing polar groups and π-electrons [9]. The molecular design of the new PBB is based on the fact that 1,3,4-thiadizole containing imine, mercapto and sulfide would contribute more effectively towards inhibition of corrosion of mild steel in acid medium.
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