Expression of concern: Effectiveness of some novel heterocyclic compounds as corrosion inhibitors for carbon steel in 1 M HCl using practical and theoretical methods

Expression of concern for ‘Effectiveness of some novel heterocyclic compounds as corrosion inhibitors for carbon steel in 1 M HCl using practical and theoretical methods’ by Abd El-Aziz S. Fouda et al. , RSC Adv. , 2021, 11 , 19294–19309, https://doi.org/10.1039/D1RA03083C.