Electrochemical studies of the effect of trans‐4‐hydroxy‐4'‐stilbazole on the corrosion inhibition of mild steel in HCl solution

Abstract

PurposeTo provide a novel synthesized stilbazole derivative as a corrosion inhibitor for researchers in the field of corrosion science.Design/methodology/approachElectrochemical corrosion measurements (tafel plots) were carried out in a 3‐electrode electrochemical cell on the mild steel electrode in 1.0 M HCl and in 1.0 M HCl containing various concentrations (1.0 × 10−7 M to 1.0 × 10−3 M) of the laboratory synthesized trans‐4‐hydroxy‐4'‐stilbazole.FindingsThe percentage inhibition of trans‐4‐hydroxy‐4'‐stilbazole on mild steel in 1 M HCl solution increased with the increase of concentration of that inhibitor. This percentage inhibition steeply increased from 10.11 percent (at 1.0 × 10−7 M) to 30.34 percent at 1.0 × 10−6 M. The slope of this increase slightly decreased at the concentration of 1.0 × 10−5 M to reach 39.61 percent. At higher concentrations, the increase of the percentage inhibition was steeper than the initial part, and reached 97.92 percent at 1.0 × 10−3 M.Practical implicationsThis inhibitor could have application in industries, where hydrochloric acid solutions are used to remove scale and salts from steel surfaces, such as acid cleaning of tankage and pipeline and may render dismantling unnecessary.Originality/valueThis paper is intended to be the building block or the nucleus for a new family or group of stilbazole derivatives in electrochemical studies of corrosion inhibitors.

Effect of Temperature on the Corrosion Inhibition of Trans-4-Hydroxy-4′-Stilbazole on Mild Steel in HCl Solution

“…A better procedure was developed and which used Heck-type vinylic addition reaction [45] catalyzed by palladium. Using this procedure, we were able to obtain a yield of about 80% and quantities reaching up to 20 g in one single reaction, following the modified procedure set by [46] and described in our previous work [40].…”

“…Structural effect of organic compounds as corrosion inhibitors was also studied [17,34,[37][38][39]. In all these studies, the nitrogen atom(s) in the compounds showed to be able to absorb very well on the metal surface and form protective layer, which in turn increased the corrosion inhibition with the increase in the concentration of the inhibitor, in some cases reaching 99% inhibition [5,40,41].…”

“…The aim of this work is to study, using weight loss measurements, the effect of temperature on the corrosion inhibition of mild steel in 1 M HCl solution by trans-4-hydroxy-4 -stilbazole, a synthesized compound that was previously studied using electrochemical technique [40] and found to be a very efficient corrosion inhibitor, and to calculate the thermodynamic parameters. Hence, the output of this study is intended to be the building block or the nucleus for a new family or group of stilbazole derivatives in all studies of corrosion inhibitors.…”

Inhibition of Mild Steel Corrosion by 3-Benzoylmethyl Benzimidazolium Hexafluoroantimonate in Acidic Solution

“…Structural effect of organic compounds as corrosion inhibitors was also studied [8,42,43,[45][46][47]. In all these studies, the nitrogen, phosphorous, and sulfur atom(s) in the compounds as well as the unsaturated double bonds like phenyl rings showed to be able to adsorb very well on the metal surface and form protective layer, which in turn increased the corrosion inhibition with the increase in the concentration of the inhibitor, in some cases reaching 99% inhibition [15,18,36,37].…”

“…These compounds included benzimidazole and imidazole derivatives [3][4][5][6][7][8][9][10][11][12][13], bipyrazole [14], stilbazole [15], quaternary ammonium salts [16][17][18][19][20][21][22][23], polyaminobenzoquinone polymers [24], substituted aniline-N-salicylidenes [25], amides [26], heterocyclic compounds [27,28], and cationic surfactants [29,30]. Other authors worked on phosphorouscontaining and sulfur-containing inhibitors [15,[31][32][33][34][35][36][37][38][39]. Other studies involved the effect of addition of some ions on the inhibition efficiency of some organic compounds.…”