Hydrodistilled volatile oil obtained from the aerial parts of Cymbopogon schoenanthus cultivated near Illizi, Algeria, was analyzed by Gas Chromatography Mass Spectrometry (GC-MS) and Gas Chromatography -Flame Ionization Detector (GC-FID). More than twenty compounds were identified, representing 94.636% of the total oil. The major constituents of essential oil were piperitone (63.35%), β-eudesmol (9.305%) and elemol (6.915%). Isolated essential oil was tested for radical-scavenging ability using the stable 2,2-diphenylpicrylhydrazyl (DPPH) radical, the 2,2'-azino-bis (ABTS) radical and for reducing power ability with a test based on the reduction of ferric cations (FRAP). In all tests, oil did not show a prominent antioxidant activity. The screening of antimicrobial activity of oil was individually evaluated against representatives of gram-positive, gram-negative bacteria and fungi, using the agar diffusion method. All tested microorganisms were inhibited by the essential oil of C. schoenanthus.
In this work, we study the inhibitory efficacy of organometallic compounds (phosphonium salts) used as an inhibitor on the corrosion of carbon steel XC70. The compound is (methoxy methyl) triphenyl phosphonium chloride (MMTP Cl). The study was performed in a 0.5M H2SO4 media. The measurements were performed by three electrochemical methods: electrochemical impedance spectroscopy potentiodynamic polarization and gravimeter method. One of the most widely used methods of protecting metals against corrosion is the use of inhibitors. They act by adsorption on the metal surface. The effectiveness of the corrosion inhibitor has been evaluated by several methods; polarization technique (Tafel line); electrochemical impedance and mass loss spectroscopy (immersion test) in acidic media. The results have allowed us to deduce the steel corrosion rate as well as other electrochemical parameters. The overall results show that the compounds (MMTP Cl) was chemically adsorbed on the steel surface. And in this case, adsorption occurs on the surface of the metal, according to the Langmuir modelin 0.5M H2SO4 solution. And the best concentration that decreasing the corrosion rate and gives inhibitory efficacy is 1ppm (R = 74.19%). A Comparative electrochemical study with that reported in the literature revealed that the efficiency of the inhibitors follows the order: 1-butyl triphenyl phosphonium chloride> (chloromethyl) triphenyl phosphonium chloride (CTP)>tetraphenyl phosphonium chloride (TP)>triphenyl phosphine oxide (TPO) > triphenyl (phenyl methyl) phosphonium chloride (TPM). It was also reported in the literature that the efficiency of halide inhibitors follows the order: I-> Br->Cl->F-.
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