PurposeThe purpose of this paper is to investigate the corrosion inhibitive properties of extracts from mature leaves of Combretum bracteosum for the corrosion of mild steel in H2SO4.Design/methodology/approachAcid extracts from mature leaves of Combretum bracteosum are used as mild steel corrosion inhibitors in various tests at 30‐60°C. The gravimetric and hydrogen evolution (via the gasometric assembly) measurements are conducted.FindingsThe mature leaves of Combretum bracteosum extracts inhibit the corrosion of mild steel in H2SO4 to reasonable extent. Inhibition efficiency increases with the plant extracts concentration and decreases with temperature. Phenomenon of physical adsorption is proposed as the mechanism of inhibition and the Frumkin adsorption isotherm obeyed. Kinetic parameters for the dissolution of mild steel in H2SO4 solutions are calculated.Practical implicationsMature leaves extract from Combretum bracteosum can be used in chemical cleaning and pickling processes.Originality/valueThe research provides new information on the possible use of the leaves of Combretum bracteosum as an eco‐friendly corrosion inhibitor of mild steel in H2SO4.
The effect of sodium sulfate and sodium sulfite on the corrosion behavior of carbon steel in CO2 capture process with methyldiethanolamine (MDEA) solution has been studied under an absorber temperature condition (50 °C). The corrosion behavior was evaluated using electrochemical methods, weight loss measurements, and surface analytical techniques. Sodium sulfate increased the system corrosiveness and the rate of corrosion increased with concentration while sodium sulfite reduced the corrosion rate and the inhibition performance improved with concentration. Weight loss measurements showed an increase in corrosion rate with time for sodium sulfate while the inhibition performance for sodium sulfite was considerably low for the tested concentration.
The influence of external magnetic and Aharonov‐Bohm (AB) flux fields on the energy spectra and thermal properties of N2, NO, CO and H2 diatomic molecules are investigated in this study. The two‐dimensional Schrödinger equation is solved with the Varshni‐screened Coulomb potential (VSCP) model using the well‐known Nikiforov‐Uvarov (NU) method. We obtained the energy eigenvalues and wavefunctions of the system and calculated the energy levels of some diatomic molecules in the m‐arbitrary state in the presence and absence of external magnetic and AB flux fields. The results show that combining the magnetic and AB flux fields eliminates degeneracy. We analyzed and plotted the partition function and other thermal properties in the presence of a magnetic field, an AB field, and a temperature‐dependent term.
Purpose
In line with current research efforts to develop eco-friendly strategies for corrosion mitigation, the purpose of this study is to appraise the anti-corrosion potential of selected amino acids on magnesium corrosion in sodium chloride solutions.
Design/methodology/approach
The corrosion inhibition of magnesium in aqueous solutions in the presence of benign, eco-friendly and readily available amino acids (alanine, arginine, histidine, lysine, proline) were evaluated using electrochemical methods.
Findings
Amino acids suppressed magnesium corrosion rate in aqueous sodium chloride solutions. The order of inhibition efficiency (%IE) was as follows: alanine < arginine < histidine < lysine < proline. The open circuit potential shift with respect to the blank was less than 0.085 VSCE, indicating that the amino acids are mixed-type corrosion inhibitors. In addition, the %IE of the amino acids was inversely proportional to the molecular weight. The results obtained indicate that the amino acids can serve as sustainable eco-friendly corrosion inhibitors for magnesium with the best inhibition efficiency attributed to proline with an efficiency of 85.1%.
Originality/value
New information on the application of amino acids as green sustainable corrosion inhibitors is provided herein.
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