Electrochemical and computational study of gumexudatesfromCanarium schweinfurthiias green corrosion inhibitor for mild steel in HCl solution

Abstract

The inhibition efficiency of the corrosion on mild steel in acid by Canarium schweinfurthii (CS) gum as inhibitor has been studied using chemical techniques (thermometric, gasometric, spectrophotometric and weight loss) and electrochemical techniques (electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP)). Scanning Electron Spectroscopy (SEM) was used to examine the surface morphology of mild steel samples both in the presence and absence of inhibitors at optimum conditions. Results obtained indicated that CS inhibited the corrosion of mild steel in HCl. The inhibition efficiency increases with increasing the inhibitor concentration but decreases with increasing the temperature. CS behaved as mixed type inhibitor retarding both cathodic and anodic reaction with high inhibition efficiency. Gas chromatography mass spectrometer (GCMS) spectrum of CS gum showed the presence of Nonacosane; 1-piperoylp; Stearic acid, 2-(hydroxymethyl)-2-nitropropane-1,3-diol, Stigmasta-5,22-dien-3-ol, dihex-5-en-2-yl phthalate, 9-octadecenoic acid, methyl ester,, 1-pentadecarecarboxylic and Oleic acid. Inhibition action of the gum gave a strong correlation with these phytochemicals in the gum. Phenomenon of physical adsorption was proposed for the inhibition and the process followed the Langmuir adsorption isotherm with very high negative values of the free energy of adsorption (G ads). Both the chemical and electrochemical results are in good agreement with each other while the surface studies reveal the formation of a smooth, dense protective layer in the presence of inhibitor. Quantum chemical computations of parameters associated with the electronic structures of specific components of the gum supported their inhibiting potentials.

Experimental and surface morphological study of corrosion inhibition of N80 carbon steel in HCl stimulated acidizing solution using gum exudate from Terminalia Mentaly

“…Tizhe and coworkers [51] reported that GETM have a variety of phytochemicals like alkaloids, saponins, flavonoids, tannins and terpenes among others. These compounds are rich in conjugated aromatic structures and contain heteroatoms with free electron pairs that are available to form bonds with the metal surface [52]. It is therefore, pertinent to say that the adsorption of these compounds onto mild steel surface is responsible for the corrosion inhibition effect.…”

Lepidagathis alopecuroides methanol extract as corrosion inhibitor for mild steel in HCl

“…Plant materials are promising green corrosion inhibitors for steel as revealed by several studies [11][12][13][14][15]. Plant materials are not only organic but eco-friendly and pose less health concerns in respect of their toxic effects to man and animals compared to inorganic corrosion inhibitors like the salts of vanadium and chromium, and some toxic synthetic organic compounds [16].…”

Canarium schweinfurthii resin as an organic binder for carbonized briquettes

“…The nitrogen found in the briquettes is attributed to the fuel-N found in charcoal fines (Glarborg et al, 2003) as well as nitrogen-containing compounds in the Canarium Schweinfurthii resin (Ameh, 2018). For oxygen, LSD showed that the difference of the means was not significant for briquettes B30/B25, B35/B25 and B35/B30.…”

“…The peak emissions of SO2, NO2, and CO2 from the briquettes met this standard. The NO x found in the briquettes is attributed to the fuel-N found in charcoal fines (Glarborg et al, 2003) as well as nitrogencontaining compounds in the Canarium Schweinfurthii resin (Ameh, 2018). The S𝑂 2 is attributed to the Sulphur in the charcoal fines (Deac et al, 2016).…”

“…resin. The GC-MS of Canarium Schweinfurthii gum obtained by Ameh (2018) revealed the following phytoconstituents; Stearic acid, 1-penta-decanecarboxylic acid, 2-(hydroxymethyl)-2nitropropane-1,3-diol, Nonacosane, 1-piperoylpiperidine, dihex-5-en-2-yl phthalate, Stigmasta-5,22-dien-3-ol, 9-octadecenoic acid, methyl ester, and Oleic acid. Thus, this study characterized the charcoal fines, Canarium Schweinfurthii resin as an alternative binder and also determined the physical and chemical properties of carbonized briquettes produced from charcoal fines using the resin as binder.…”