Anticorrosion Inhibition Behavior of Rhus Pentaphylla Fruit Extracts in (1 M) HCl against Carbon Steel and their Chemical Characterization using HPLC‐MS‐ESI

Abstract

Phenolic compounds in Tunisian wild Rhus pentaphylla fruits during two maturity stages are identified by LC-MS-ESI. The corrosion inhibition efficiency of their extracts was analyzed by the use of polarization curves and electrochemical impedance spectroscopy. The qualitative analysis highlighted the presence of 11 phenolic compounds in total (3 phenolic acids and 8 flavonols) for the un-ripe stage (S1), 7 compounds (1 phenolic acid and 6 flavonols) have been identified for the fully-ripe stage (S2). The electrochemical behavior analysis of carbon steel in (1 M) HCl medium showed a maximum inhibition efficiency of 45.49 % was achieved by using 100 ppm of the inhibitor. Polarization studies indicate that the extracts act as a mixed inhibitor. As well, it has been shown that the first stage presents the highest inhibitory efficacy compared to the second. These results confirm the good correlation between the phytochemical composition and corrosion inhibition capacity.

Adsorption and Corrosion Inhibition of Cactus cladode Extract and Effect of KI Addition on Mild Steel in 0.5 M H2SO4

“…The plants are natural, local and their availability are easy, which may make them promising inhibitors for the the industrial applications.Many natural plants or their extracts,i. e. taraxacum officinale extract, [19] rhus pentaphylla fruit extracts, [20] hyalomma tick extract, [21] lavandula mairei extract, [22] hemerocallis fulva, [23] arthrospira platensis extract, [24] centipeda minima leaves extract, [25] liriope platyphylla extract, [26] and gloriosa superba seeds [27] have reported as effective corrosion inhibitors against different metals.Thirupathi et al [28] studied an ethanolic extract of portulaca quadrifida (PQ) leaves and synergistic effect between PQ and Zn 2 + ions on the inhibition of carbon steel in well-water. The authors reported 92 % inhibition efficiency in the presence of PQ and Zn 2 + due to possible synergism between them.…”