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The essential oil of Santolina pectinata aerial parts (SP oil) was extracted by hydrodistillation and analyzed by Gas Chromatography (GC) and Gas Chromatography-Mass Spectrometry (GC/MS). 34 components were identified, accounting 59.4% of the total oil, which (Z)-heptadeca-10,16-dien-7-one (ZHD) was the major component with 28 % of the oil. The protective effect of this oil on the corrosion of mild steel (MS) in 1M HCl solution was tested by the measurements of Weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS). From WL measurements, the inhibiting effect was raised with the increasing of both concentration inhibitor and temperature. PDP curves led to a mixed-type inhibitor. The charge transfer process mainly controls the results of EIS measurements. The SP oil adsorption not only was discovered to obey Langmuir isotherm but showed a chemical interaction as well. The computational methods such as density functional theory (DFT), Monte Carlo (MC) and radial distribution function (RDF) simulations were also performed to analyze the possible contribution of (Z)-heptadeca-10,16-dien-7-one (ZHD) to the corrosion prevention effect of global oil.

E SSENTIAL oil of Santolina pectinata lag. aerial parts was obtained by hydrodistillation and analyzed, for the first time, by using gas chromatography and gas chromatography-mass spectrometry (GC-MS (EI)). 33 components were identified which a non terpenic oxygenated compound i.e., (Z)-heptadeca-10,16-dien-7-one strongly dominated the oil composition with 28%. The structure of this natural compound was determined for the first time by a Positive electro spray ionization time-of-flight mass spectrometry (ESI (+) -TOF-MS, one-dimensional and twodimensional nuclear magnetic resonance spectroscopy.

The aim of the present work is to evaluate the protective ability of newly menthone derivatives 7-isopropyl-4-methyl-4,5,6,7-tetrahydro-1H-indazole (HMP) and 7-isopropyl-4-methyl-1-phenyl-4,5,6,7-tetrahydro-1H-indazole (PMP) as mild steel corrosion inhibitors in 1M HCl, which may get applications as eco-friendly corrosion inhibitors in acidizing processes in the industry. The corrosion attitude of mild steel at various concentrations of the inhibitors was examined in the range from 298 to 328 K. An increase in the inhibitory effectiveness in acidic solution at higher concentration and temperature follow the existence of inhibitors. The aspect of adsorption mixed type of inhibitors was highlighted by the Polarization curves. The adsorption of HMP and PMP is in line with the Langmuir isotherm model. Theoretical indices study of both inhibitors (HMP and PMP) via CDFT (the conceptual density functional theory) has been studied. To search for the best spatial configuration of steel/inhibitor a Monte Carlo simulation studies were applied.

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In this study, two aqueous extracts from the aerial parts of Aaronsohnia pubescens subsp. pubescens (Odorized aqueous extract (OE) and Deodorized aqueous extract (DE)) were used as some novel ecological corrosion inhibitors for mild steel (MS) in 1 M HCl medium. For this reason, the inhibition behavior of the OE and DE were investigated using weight loss measurements, electrochemical assays, kinetics, and thermodynamic parameters, and electrochemical methods, both stationary (Potentiodynamic polarization (PDP)) and transient (Electrochemical impedance spectroscopy (EIS)). The obtained results showed that EO and DE act as effective corrosion inhibitors and the inhibition efficiency of inhibitors increases for the concentration of 1.5 g/L; reaching some high values of 93.11 and 87.88% in 1 M HCl solution at 308 K for OE and DE, respectively. Furthermore, PDP measurements exhibited that the studied of each inhibitor performs as a mixed-type inhibitor. The results of the thermodynamic kinetic parameters indicate the adsorption of OE and DE on the MS surface sites obeying the Langmuir adsorption isotherm.