Corrosion inhibition and thermodynamic activation parameters of Myrtus communis extract on mild steel in sulfamic acid medium

Abstract

The effect of an aqueous extract of Myrtuis communis on the corrosion behavior of mild steel (MS) in 5% NH 2 SO 3 H solution has been investigated by the following techniques: weight loss (WL), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation techniques (EFM). The inhibition efficiency (IE) increased with increase in inhibitor dose and increased with rise in temperature. The thermodynamic parameters of corrosion and adsorption processes were calculated and discussed. The adsorption of this extract was found to obey Langmuir adsorption isotherm. The PP tests indicated that the extract is mixed type. The results obtained from the three different techniques were in good agreement. The morphology of the surface was analyzed and discussed.

Inhibitive effect of Thymus satureioides essential oil as a green corrosion inhibitor for mild steel in an acidic medium

“…It is apparent from Table 6 that the impedance of the inhibited system amplified with the inhibitor and the C d values decreased with inhibitor. This decrease in C d results from a decrease in local dielectric constant and/or an increase in the thickness of the double layer, suggested that EO molecules inhibit the mild steel corrosion by adsorption at the metal/acid interface [10].The impedance study confirms the inhibiting characters of the investigated inhibitor obtained with potentiostatic polarization and gravimetric methods. These observations show that the EO molecules are adsorbed on the mild steel surface.…”

“…However, these techniques are often unsuitable when the metal is exposed to a corrosive medium for a long time. Therefore, the use of corrosion inhibitors is one of the most common methods applied for protecting metal or alloy surfaces in acidic environment [9][10][11][12][13][14].…”

“…In the field of science, researches turned to anything biodegradable and respectful of the environment. In corrosion inhibition field, research has been devoted on corrosion prevention by green inhibitors namely also ecofriendly inhibitors that show good inhibitory effect with low risk of environmental and low cost [1,2,10,[15][16][17]. The Thymus species are widely distributed in various regions in Morocco [18].…”

Influence of Lavandula Dentata essential oil on the corrosion inhibition of carbon steel in 1 M HCl solution

“…According to these result, the higher value of the activation energy in the presence of 2.4 g/l of EOLD can be explained by the molecules of our inhibitor are adsorbed on the surface by connections of electrostatic nature (physisorption) [41][42][43]. The calculated values are very close to RT which is equal to 2.52 kJ·mol -1 at 303 K. Also the positive sign of * a H …”

Inhibitive effect of Artemisia Judaica Herbs extract on the corrosion of carbon steel in hydrochloric acid solutions

“…Plant extracts are cheap and ecologically safe, so the key features of utilizing extracts as corrosion mitigation is money related and safe condition. As of late, many extracts have been utilized as viable corrosion mitigation for CS or/and different metals in acid solutions, such as Zenthoxylum alatum [4], Anise [5], Propolis [6], orange peels [7], Myrtus communis [8], Azadirachta indica [9], fruit peel [10] and Vernonia amygdalina [11]. The protection of extracts is regularly attributed to the attendance of a complex of organic compounds [12] containing flavonoids, polyphenols, nitrogen, alkaloids bases [13], proteins, amino acids [14] and sugars not only that but also possible hydrolysis molecules in their structure.…”