2,2'-((1Z,1'Z)-(((propane-1,3-diylbis(oxy))bis(2,1-phenylene))bis(methanylylidene))bis(azanyly lidene))diethanol (2-PPM) was synthesized. This compound evaluated as novel corrosion inhibitor for mild steel in 1N H2SO4 solution. Polarization study showed that the compound was mixed type inhibitor. Electrochemical impedance study showed that the presence of this compound decreases the double layer capacitance and increases the charge transfer resistance.Weight loss study showed that, the corrosion inhibition property of 2-PPM on the external area of mild steel samples in the solution is mainly depends on the inhibitor concentration and immersion period. Further, the maximum protection efficiency obtained by weight loss technique was 65 %. SEM and AFM results fully support the chemical and electrochemical results.

Given the urgent need for renewable, environmentally safe sources and the growing concern about the economic and environmental impacts of corrosion in light of continuous industrial progress, we aim in this research to study the effect of the extraction stage on Salicornia Extract (SE) performance as an economically and safely alternative source for inhibiting low-carbon steel corrosion in 3.5% NaCl under variant conditions. The effect of the sonication period on inhibition efficiency was investigated by preparing four extracts. The first, second, third, and fourth were prepared by exposing them to 20, 30, 40, and 50 minutes of ultrasonography, respectively. The study was carried out using weight loss, polarization, open circuit potential techniques for corrosion studies, and Fourier Transform InfraRed (FT-IR) spectroscopy to detect the functional groups in the obtained extracts. The results showed that there was a difference in the chemical composition of the four extracts and thus in their performance, as the inhibition efficiency increased with the sonication time up to 40 minutes, while it began to decrease after more exposure to the ultrasound. The results raised an important point, which is the possibility of using ultrasound as a new method to detect the active groups exactly responsible for the inhibition process in plant extracts. The third extract showed excellent ability for mild steel corrosion inhibition at different concentrations and temperatures. The inhibition efficiency increased with concentration and temperature and reached 90.11% at 7% v./v. and 328 K as a maximum value.

The exploitation of naturally obtained resources like biopolymers, plant-based extracts, microorganisms etc., offers numerous advantages of environment-friendliness and biocompatibility for various medicinal and pharmaceutical applications, whereas hazardous chemicals are not utilized for production protocol. Plant extracts based synthetic procedures have drawn consideration over conventional methods like physical and chemical procedures to synthesize nanomaterials. Greener synthesis of nanomaterials has become an area of interest because of numerous advantages such as non-hazardous, economical, and feasible methods with variety of applications in biomedicine, nanotechnology and nano-optoelectronics, etc.

The trend upwards using green, safe, and environmentally friendly corrosion inhibitors has led to many studies being conducted on plant extracts and presenting them as an ideal alternative candidate. Here, Fig leaf extract (FLE) was prepared quickly at a low temperature (313K) to preserve the main chemical composition and distilled water as the solvent of extraction. This green inhibitor was employed to prevent steel corrosion in hydrochloric acid 1 M. The inhibitory efficacy, adsorption, and action mechanism of this prepared inhibitor were assessed using potentiodynamic polarization, electrochemical impedance spectroscopy, and gravimetric measurements. Thermodynamic analysis and adsorption isotherms have been, also, applied to elucidate the adsorption mechanism. The obtained results have shown that FLE is of a mixed type, follows the Langmuir isotherm and his inhibitory efficiency reached a maximum of 94%. The formation of an inhibitor film chemically adsorbed was confirmed by the analysis of corrosion process activation parameters, and also by a rise in inhibition efficiency as temperature was increased. These findings were validated by FTIR and FTIR second derivative spectra. Steel surface morphology was investigated using SEM techniques and XRD analysis. A satisfactory corrosion inhibitory effect on acid steel was brought by fig leaf extract, which is in line with the desire for the use of environmentally friendly, non-toxic products.

The essential oil from the aerial parts of Aaronsohnia pubescens subsp. pubescens plant (APS oil) was extracted by hydrodistillation, and then its composition was analyzed by gas chromatography (GC) and GC-mass spectrometry (GC/MS). We identified thirty-four constituents presenting 87% of the total amount, Which, Carvacrol (13. 9%), α-Pinene (10. 3 %), E-Anethole (10. 1%) and Ar-Turmerone (9. 3%) were identified as major constituents of APS oil. The corrosion inhibition and adsorption (CIA) performance of the APS oil on the corrosion mild steel (MS) in 1M hydrochloric acid was evaluated by the weight loss (WL) analysis and electrochemical assays. The weight loss outcomes indicate that APS oil shows a worthy inhibitory efficiency of 89. 88 % which reached at 3g. L-1 and 343 K. The charge transfer process mainly controls the results of EIS measurements, PDP measurements showed that the studied APS oil performs as a mixed-type inhibitor. Furthermore, the adsorption on the MS surface follows the Langmuir model.