Effect of syzygium cumini leaf extract as a green corrosion inhibitor on API 5l carbon steel in 1M HCL

Abstract

Corrosion in API 5L steel under 1M HCl is a common issue; hence, creating a more effective and naturally-based inhibitor is critical. In this research, Syzygium Cumini leaf extract (SCLE) was used as a new green corrosion inhibitor under acidic conditions. The inhibition properties of the novel cumini extract were thoroughly characterized using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), Fourier-transform infrared spectroscopy (FTIR), and atomic force microscope (AFM). The results show that the cumini inhibitor has excellent corrosion inhibition with 93 % inhibition efficiency. The adsorption behavior of the inhibitor follows the Langmuir Adsorption Isotherm due to the nearness of R2 to unity. The potentiodynamic and electrochemical measurements demonstrate the mixed type of corrosion inhibitor. Thermodynamic calculation of ΔGads is – 18.41 kJ mol-1 showing the physical adsorption process between the inhibitor and metals. Further inspection of ΔHads at ‒58.93 kJ mol-1 considers releasing energy during adsorption. The FTIR results agree with the increased growth of passive layers due to the adsorption of polyphenol and flavonoids on metals. Remarkably, the adsorption peak at 3266.59 cm-1 corresponds to the adsorption of –OH. The peak at 1612.56 and 1698.4 cm-1 is attributed to C=C and C=O functional groups. The above functional groups serve as adsorption centers to reduce the corrosion effect. The surface treatment of AFM indicated a good relationship with the functional group characterization and confirmed the significant corrosion rate reduction. This work can be used as a benchmark to develop a natural plant as a corrosion inhibitor.

Electrochemical analysis of corrosion inhibition shallot leaf (Allium cepa) extract on mild steel in acidic medium at different immersion times

“…This trend suggests that SLE molecules adsorbed to the metal/solution interface create a long-term protective barrier, inhibiting the molecules from adhering to the metal surface and, thus, shielding it from corrosive attack. Plant extracts, including syzygium cumini [32], rosa canina [33], esfan seed [34], and dardagan fruit [29] also exhibit this behavior. From Table 2, the results demonstrate clearly that double-layer capacitance (Cdl) decreases as Rct values increase.…”

Green synthesis of cadmium oxide nanoparticles (CdO-NPS) using syzygium cumini: exploring industrial applications of CdO NPs as a corrosion inhibitor of mild steel in the acidic environment

“…Java plum leaves have a high amount of ferulic acid, rutin, catechin, and limonene. 21 Nanoparticles are extensively used in various elds due to their exceptional characteristic features. 22,23 However, the cost factor and eco-friendly aspects are the biggest concerns in green synthesis.…”

Identifying of chemical composition changes during the carburizing process of carbon steel under tension

“…Low-carbon steel, characterized by its comparatively low carbon content, is a flexible and extensively used material across several sectors. The carbon concentration of this material, which is generally less than 0.25 % by weight, imparts distinct characteristics that render it appropriate for various applications [1,2]. Although it may exhibit lower strength and hardness than steels with greater carbon content, it offsets these limits by possessing many other advantageous properties.…”