Barley Agro-industrial Residues as Corrosion Inhibitor for Mild Steel in 1mol L-1HCl Solution

Abstract

The corrosion inhibition of mild steel in 1 mol L −1 HCl by barley grains and malting process residue extracts was investigated by weight loss measurements, polarization curves, electrochemical impedance measurements and scanning electron microscopy. The inhibition efficiency exceeded 92% in the presence of 100 mg L −1 extracts after 24 h immersion time for both extracts. The E a decreased with the addition of the extracts, characterizing the chemical adsorption by the molecules present in the extracts on the surface.The high molecular weight fraction isolated from the barley grain extract also showed high inhibition efficiency, suggesting that macromolecules are probably responsible for the inhibitory action.

Application of an Aqueous Extract of Cotton Seed as a Corrosion Inhibitor for Mild Steel in HCl Media

“…The gravimetric measurements have been detailed in our previous works [7][8][9][10][11][12][13][14][15][16] . Initially, the weight loss measurements were performed with different immersion times (2, 4 and 24 h) and varying the concentrations of the extract in 100, 200, 400 and 800 mg L −1 .…”

“…However, some synthetic compounds can result in environmental damage, increasing the risk to human health. New biodegradable, inexpensive, and environmentally friendly products have been used for corrosion control [4][5][6][7][8][9][10][11][12][13] .…”

Synthesis of ZnO-NPs Using a Convolvulus arvensis Leaf Extract and Proving Its Efficiency as an Inhibitor of Carbon Steel Corrosion

“…The values of K ads for Langmuir and Freundlich decrease with an increase in temperature, indicating that the adsorption process slows down with an increase in temperature and is unfavorable at higher temperatures. The K ads for Temkin increases with an increase in temperature and suggests that the adsorption of the inhibitor on the metal surface at higher temperatures was due to physical adsorption [8,38].…”

Corrosion inhibition of two Schiff base complexes on the mild steel in 1M HCl solution

“…Using Langmuir adsorption isothermal equation to calculate the absorption isotherms as in Eq. (5) [11,25,26,27]: C/θ = 1/ K ads + C (5) Where K ads is the equilibrium constant for the adsorption/ desorption process, C is the inhibitor concentration in the bulk of the solution. From the intercepts of the straight lines on the C/θ axis, one can calculate K ads values that relate the standard free energy of adsorption, (∆ G ads 0 ), as given by Eq.…”

“…From the intercepts of the straight lines on the C/θ axis, one can calculate K ads values that relate the standard free energy of adsorption, (∆ G ads 0 ), as given by Eq. (6) [11,26,27,28] K ads = 1/ 55.5 exp (-(∆ Gads/ RT) or (6) ∆ G ads 0 = -RT ln (55.5 K ads )…”