A study of glycine-based dithiocarbamates as effective corrosion inhibitors for cold rolled carbon steel in HCl solutions

• Published in: Surfaces and interfaces 2020-12, Vol.21, p.100751, Article 100751
• Main Authors: Zeinali Nikoo, Somayeh, Shockravi, Abbas, Mokarami Ghartavol, Hajar, Halimehjani, Azim Ziyaei, Ostadrahimi, Mojtaba, Mirhosseini, Seyed Majid, Behzadi, Hadi, Ghorbani, Mohammad
• Format: Article
• Language: English
• Subjects: Cold rolled steel (CRS); Corrosion inhibitor; DFT calculations; Dithiocarbamate derivatives (DTC); Electrochemical studies; Hydrochloric acid corrosion
• ISSN: 2468-0230; 2468-0230
• DOI: 10.1016/j.surfin.2020.100751

•Two glycine-based dithiocarbamates were synthesized with benzyl (BDTC) and propyl (PDTC) groups.•Both BDTC and PDTC acted as mixed type corrosion inhibitors on CRS surface.•Best Corrosion inhibition efficiency of 98.4% was obtained for 1000 ppm BDTC•Surface studies supported the chemisorption of molecules forming a protective film.•Correlations between molecule structure and inhibitor performance were studied. The corrosion inhibition of glycine-based dithiocarbamates with benzyl (BDTC) and propyl (PDTC) groups were investigated for cold rolled carbon steel (CRS) in 0.5 M HCl, indicating that the compounds as mixed type inhibitors significantly reduced the corrosion rate of the CRS due to the formation of a stable protective film on the metal surface. As confirmed by ATR-FTIR, SEM, AFM, XPS and theoretical studies, chemically adsorbed BDTC molecule is a better corrosion inhibitor with higher corrosion efficiency of about 98% at room temperature and a better thermal stability attributed to the Fe-S and Fe-N bindings, and in addition, to the presence of the benzene ring in the molecular structure. [Display omitted]