Browsing by Author "Ricky, Emanuel X"

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    Corrosion Inhibition of Mild Steel in Seawater by 2,4,6-Triamino-3-Pentadecylphenyl Acetate Derived from Cashew Nut Shell Liquid
    (Tanzania Journal of Science, 2021-02-15) Ricky, Emanuel X; Lugwisha, Esther HJ; Philip, Joseph YN
    The corrosion inhibition performance of 2,4,6-triamino-3-pentadecylphenyl acetate on mild steel in seawater at stationary condition, 30 °C and pH 8 was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. The maximum inhibition efficiency of 93% was found in the presence of 300 ppm of 2,4,6-triamino-3-pentadecylphenyl acetate for both potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The potentiodynamic polarization curves show that 2,4,6-triamino-3-pentadecylphenyl acetate acts as a mixed type inhibitor which influences more the anodic processes. The Nyquist plots revealed that the polarization resistance (Rp) increases whereas the double-layer capacitance (Cdl) and corrosion current density (icorr) decrease as the concentrations of the inhibitors increase due to the formation of a protective layer of inhibitor over the mild steel surface. The results obtained from the two electrochemical techniques are in good agreement. The adsorption of 2,4,6-triamino-3-pentadecylphenyl acetate on the mild steel surface obeyed Langmuir adsorption isotherm.
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    The study of m-pentadecylphenol on the inhibition of mild steel corrosion in 1 M HCl solution
    (Journal of Industrial and Engineering Chemistry, Published by Elsevier B.V., 2021-06-07) Ricky, Emanuel X; Mpelwa, Musa; Xu, Xingguang
    The acidic fluids used in the acidification of oil wells provoke corrosion of metallic materials unenviably. As a consequence, corrosion inhibitors are needed to mitigate or retard the corrosion process. Herein, we report m-pentadecylphenol as an eco-friendly corrosion inhibitor in acidic media developed from cashew nut shell liquid (CNSL), which is a low-cost and sustainable source. The inhibitor was evaluated as corrosion inhibitor for mild in 1 M HCl corrosive solution by potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), weight loss, Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), and energy-dispersive x-ray fluorescence (EDX-RF) spectrometry methods. The results showed that the inhibition efficiency of m-pentadecylphenol was at least 95% at an optimal concentration (300 ppm). The inhibition efficiency was found to increase as the inhibitor concentration increments from 100 to 300 ppm. Further studies revealed the inhibition performance of m-pentadecylphenol to be marginally reliant on temperature as the temperature rises from 303 to 333 K. At 333 K, the inhibition performance of the inhibitor was still promising (about 85%) when the concentration was 300 ppm. The adsorption studies revealed the spontaneous aptitude of m-pentadecylphenol to inhibit corrosion by forming a non-conductive inhibitive layer on the mild steel surface mainly through the chemisorption mechanism. The chemisorption adsorption was satisfactorily described by the Langmuir adsorption isotherm model. Besides, the potentiodynamic polarization measurements revealed m-pentadecylphenol to act as an anodic inhibitor. The overall findings revealed that m-pentadecylphenol to be an effective corrosion inhibitor in harsh corrosive vicinities with the added advantages of being eco-friendly and relatively cheaper. Thus, it can replace the use of non-green and expensive corrosion inhibitors in the industry.
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    Systematic and Facile Analysis of Deposits Composition: Implication on Effective Treatment of Oilfield Solid Deposits
    (American Society of Mechanical Engineers, 2021-07-27) Ricky, Emanuel X; Xu, Xingguang
    Oilfield solid deposits present the major flow assurance problems in the oil and gas industry. In general, the deposits need to be accurately identified and quantified for appropriate design and successful implementation of any treatments. However, few works have been reported on the establishment of a systematic analytical procedure. This work, for the first time, presents a systematic approach that may be used to identify and quantify the composition of oilfield solid deposits, with different analytical methods been jointly used. The X-ray Diffraction and Fourier Transform Infrared Spectroscopy techniques were found very helpful in identifying the composition of the investigated oilfield solid deposit, whereas Thermogravimetric Analysis and Microwave Induced Plasma-Atomic Emission Spectroscopy were the most appropriate quantification techniques. The collected sample was found to contain mainly CaCO3 and consequently, the acid treatment method that involves the use of hydrochloric acid (HCl) solution was proposed to be the most applicable and cost-effective treatment method for its remediation. The exact amount of CaCO3 scale in the oilfield system, the concentration and volume of HCl solution required for the acid treatment method need to be precisely determined to ensure the effective treatment. We believe this well-established analytical procedure will be helpful and enlightening for identification and quantification of oilfield solid deposits and thus may facilitate the effective and efficient treatments on the undesirable deposits