Vol.:(0123456789) 1 3 Chemistry Africa (2020) 3:251–261 https://doi.org/10.1007/s42250-019-00093-8 ORIGINAL ARTICLE Adsorption and Corrosion Inhibition Properties of Butanolic Extract of Elaeoselinum thapsioides and Its Synergistic Efect with Reutera lutea (Desf.) Maires (Apiaceae) on A283 carbon Steel in Hydrochloric Acid Solution M. Benahmed 1  · I. Selatnia 2  · N. Djeddi 1  · S. Akkal 3  · H. Laouer 4 Received: 12 May 2019 / Accepted: 7 September 2019 / Published online: 14 September 2019 © The Tunisian Chemical Society and Springer Nature Switzerland AG 2019 Abstract The current investigation presents the corrosion activity of Elaeoselinum thapsioides (BEET) butanolic extract in 1 M HCl as a novel green source of corrosion inhibitor, and it’s synergetic efect with another butanolic extract of Reutera lutea (BERL), whose belongs to the Apiaceae family. Weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements have been done to study the inhibition efciency. The obtained results showed that the inhibition efciency of BEET alone increase with concentration and reached a value of 82% at 900 ppm. However, the maximum protection efciency was more than 92% with the combination of BEET and BERL inhibitors. The rise of temperature caused a signifcantly decreased of inhibition efciency. The potentiodynamic polarization results revealed that the extract functions as mixed-type inhibitor with predominance at anodic domain, and the adsorption process of the extract follows Langmuir isotherm. In addition, EIS shows that increasing the concentration of the inhibitor leads to an increase of the charge transfer resistance and reducing the double layer capacitance. The synergistic factor (S) was used to investigate the synergistic behavior of the selected inhibitors. Keywords Corrosion inhibitors · Plant extract · Apiaceae · EIS 1 Introduction Metals and alloys are extensively utilized in various applica- tions in industries feld due to their admirable physical prop- erties and afordability in the economy [1]. However, the exposition to aggressive environments during long-term ser- vice, these materials tend to lose their corrosion resistance ability, which leads to the deterioration of their surfaces and afecting their durability causing serious economic losses and pollution of the environment [2, 3]. In order to mitiga- tion corrosion problems, several methods were adopted such as coating, anodic protection and the use of inhibitors [4]. Up to now, the employment of inhibitors has still the most popular topic of research in the feld of corrosion, in view of their ease of application and their high efectiveness [5–7]. Diferent kind of inhibitors have been used over the years such as inorganic and organic compounds, but due to their toxicity and restrictive environmental regulations, the devel- opment of environmentally corrosion inhibitors has become highly recommended [8–10]. Recently, plant extracts have gained attention as environmentally friendly corrosion inhib- itors, due to their ready availability, renewable, non-toxic, and inexpensive [11–14]. These extracts are a mixture of various phytochemical constituents (alkaloids, favonoid, terpenoids, steroids, and amino acids, ….), contains several * I. Selatnia ilhem_k2006@yahoo.fr 1 Laboratory of Bioactive Molecules and Applications, Tebessa University, Constantine Road, 12002 Tebessa, Algeria 2 Laboratory of Analytical Sciences, Materials and Environmental (LSAME), Larbi Ben M’Hidi University, 04000 Oum El Bouaghi, Algeria 3 Laboratory of Phytochemistry, Physicochemical and Biological Analyses, Department of Chemistry, Exact Sciences Faculty, Mentouri University, Ain el Bey Road, 25000 Constantine, Algeria 4 Laboratory for the Valorization of Natural Biological Resources, Department of Biology, Ferhat Abbas University, Setif, Algeria