scholarly journals A Comparative Study of the Inhibitory Effect of the Extracts ofOcimum sanctum,Aegle marmelos, andSolanum trilobatumon the Corrosion of Mild Steel in Hydrochloric Acid Medium

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
M. Shyamala ◽  
P. K. Kasthuri
Keyword(s):  
Comparative Study ◽  
Mild Steel ◽  
Plant Extracts ◽  
Inhibition Efficiency ◽  
Hydrogen Permeation ◽  
Inhibitory Effect ◽  
Impedance Method ◽  
Ocimum Sanctum ◽  
Aegle Marmelos ◽  
Solanum Trilobatum

A comparative study of the inhibitory effect of plant extracts,Ocimum sanctum, Aegle marmelos, andSolanum trilobatum, on the corrosion of mild steel in 1N HCl medium was investigated using weightloss method, electrochemical methods, and hydrogen permeation method. Polarization method indicates plant extracts behave as mixed-type inhibitor. The impedance method reveals that charge-transfer process mainly controls the corrosion of mild steel. On comparison, maximum inhibition efficiency was found inOcimum sanctumwith 99.6% inhibition efficiency at 6.0% v/v concentration of the extract. The plant extracts obey Langmuir adsorption isotherm. The SEM morphology of the adsorbed protective film on the mild steel surface has confirmed the high performance of inhibitive effect of the plant extracts. From hydrogen permeation method, all the plant extracts were able to reduce the permeation current. The reason for the reduced permeation currents in presence of the inhibitors may be attributed to the slow discharge step followed by fast electrolytic desorption step. Results obtained in all three methods were very much in good agreement in the orderOcimum sanctum>Aegle marmelos>Solanum trilobatum.

scholarly journals The Inhibitory Action of the Extracts ofAdathoda vasica, Eclipta alba,andCentella asiaticaon the Corrosion of Mild Steel in Hydrochloric Acid Medium: A Comparative Study

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
M. Shyamala ◽  
P. K. Kasthuri
Keyword(s):  
Mild Steel ◽  
Plant Extracts ◽  
Inhibition Efficiency ◽  
Hydrogen Permeation ◽  
Centella Asiatica ◽  
Impedance Method ◽  
Protective Film ◽  
Eclipta Alba ◽  
Mixed Control ◽  
Weight Loss Method

The Inhibitive action of the extracts ofAdathoda vasica, Eclipta alba,andCentella asiaticaon the corrosion of mild steel in 1N HCl has been studied using weight loss method, electrochemical methods, and hydrogen permeation method. Polarization method indicates that the plant extracts are under mixed control, that is, promoting retardation of both anodic and cathodic reactions. The impedance method reveals that charge-transfer process controls the corrosion of mild steel. The plant extracts obey Langmuir adsorption isotherm. Theoretical fitting of the corrosion data to the kinetic-thermodynamic model was tested to show the nature of adsorption. Physisorption mechanism has been proposed for the inhibition action of these plant extracts. The protective film formed on the surface was confirmed by SEM. From hydrogen permeation method, all the plant extracts were able to reduce the permeation current. Results obtained in all three methods were very much in good agreement in the orderEclipta alba > Adathoda vasica > Centella asiatica,and, among the three plant extracts studied, the maximum inhibition efficiency was found inEclipta albawhich showed 99.6% inhibition efficiency at 8.0% v/v concentration of the extract.

scholarly journals A Comparative Study of the Inhibitory Effect of Gum Exudates from Khaya senegalensis and Albizia ferruginea on the Corrosion of Mild Steel in Hydrochloric Acid Medium

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Paul Ocheje Ameh
Keyword(s):  
Comparative Study ◽  
Mild Steel ◽  
Inhibition Efficiency ◽  
Chemical Constituents ◽  
Inhibitory Effect ◽  
Adsorption Model ◽  
Hydrochloric Acid Medium ◽  
Maximum Inhibition ◽  
Active Chemical ◽  
Khaya Senegalensis

A comparative study of the inhibitory potentials of gum exudates from Albizia ferruginea (AF) and Khaya senegalensis (KS) on the corrosion of mild steel in HCl medium was investigated using weight loss and gasometric method. The active chemical constituents of the gum were elucidated using GC-MS while FTIR was used to identify the bonds/functional groups in the gums. The two gum exudates were found to be good corrosion inhibitors for mild steel in acidic medium. On comparison, maximum inhibition efficiency was found in Khaya senegalensis with 82.56% inhibition efficiency at 0.5% g/L concentration of the gum. This may be due to the fact that more compounds with heteroatoms were identified in the GCMS spectrum of KS gum compared to the AF gum. The presence of such compounds may have enhanced their adsorption on the metal surface and thereby blocking the surface and protecting the metal from corrosion. The adsorption of the inhibitors was found to be exothermic and spontaneous and fitted the Langmuir adsorption model.

scholarly journals Effect of Terminalia catappa Leaves Extract on Corrosion of Mild Steel using Response Surface Methodology

2020 ◽  
Vol 27 (2) ◽  
pp. 47-56
Author(s):  
A.O. Okewale ◽  
O.A. Adesina ◽  
B.H. Akpeji
Keyword(s):  
Response Surface Methodology ◽  
Mild Steel ◽  
Response Surface ◽  
Inhibition Efficiency ◽  
Desirability Function ◽  
Inhibitory Effect ◽  
Quadratic Model ◽  
Box Behnken Design ◽  
Terminalia Catappa ◽  
Maximum Inhibition

Effect of Terminalia catappa leaves (TCL) extract in inhibiting corrosion of mild steel was investigated. In order to obtain the maximum inhibition efficiency, optimization of the process variables affecting corrosion of mild steel was carried out using the Box – Behnken Design plan and desirability function of Response Surface Methodology (RSM). The three parameters - varied include; TCL concentration (inhibitor), immersion time, and temperature and there effects in corrosion inhibition were established. The optimum conditions predicted from the quadratic model were inhibitor’s concentratrion (0.39 g/l), exposure time (8.68 hours), and temperature (36.06 oC) with the inhibition efficiency of 91.95 %. The data fitted well to the quadratic model which was validated. Adsorption of the extract’s component on the mild steel was responsible for the inhibitory effect of the TCL extract.The results showed that 97.92% of the total variation in the inhibition efficiency of TCL can be connected to the variables studied. Keywords: Mild steel, acid, Terminalia catappa, Corrosion, Response surface methodology (RSM).

scholarly journals Inhibition of Mild Steel Corrosion in 1M Hydrochloric Medium by the Methanolic Extract of Ammi visnaga L. Lam Seeds

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Aouatife Zaher ◽  
Abdelkarim Chaouiki ◽  
Rachid Salghi ◽  
Asmaa Boukhraz ◽  
Brahim Bourkhiss ◽  
...  
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Methanolic Extract ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Inhibitory Effect ◽  
Total Extract ◽  
Ammi Visnaga ◽  
Mild Steel Corrosion ◽  
First Time

The chemical composition of the methanolic extract of Ammi visnaga (Khella) seeds from the Sidi Slimane region is determined for the first time by Gas Chromatography coupled with Mass Spectrometry (GC/MS). Ten compounds representing 99.638% of the total extract were identified. Khellin (49.011%), Visnagin (26.537%) and Dimethylethylamine (15.108%) are the major components. Moreover, the inhibitory effect of the Methanolic extract of the seeds of Ammi visnaga on the corrosion of mild steel in a solution of 1M HCl is determined using weight loss measurements, the potentiodynamic technique as well as the technique of electrochemical impedance spectroscopy (EIS). It is found that the extract reduces the corrosion rate of the steel in the acid solution. Inhibition efficiency increases as the concentration of the extract increases. The tested compound has an inhibition efficiency of 84% for a concentration equal to 1.0 g/L. The polarization measurements indicate that the examined extract acts as a mixed inhibitor with predominant anodic efficacy. The data obtained from EIS studies are analyzed to model this process using appropriate equivalent circuit models. The adsorption of the extract on the surface of the mild steel obeys the Langmuir adsorption isotherm in acidic medium and the activation is determined and discussed.

scholarly journals Efficacy of botanical formulations and fungicides against Botryosphaeria dothidea, causing white rot in apple (Malus × domestica Borkh.)

2017 ◽  
Vol 9 (3) ◽  
pp. 1434-1439
Author(s):  
Kishor Sharma ◽  
Harender Raj
Keyword(s):  
Plant Extracts ◽  
Mycelial Growth ◽  
Inhibitory Effect ◽  
White Rot ◽  
Ocimum Sanctum ◽  
Melia Azedarach ◽  
Vitex Negundo ◽  
Botryosphaeria Dothidea ◽  
Cow Urine

The present study was conducted to determine inhibitory effect of plant extracts, their botanical formula-tions (BF1 and BF2) and safer fungicides against Botryosphaeria dothidea cause white rot of apple (Malus × domes-tica) during storage. Poisoned food technique was performed to evaluate the efficacy of different plant extracts, their botanical formulations and safer fungicides. Out of twelve botanicals evaluated under in vitro conditions against the white rot pathogen, leaf extract of Ocimum sanctum was found most effective among all the treatments with 54.07 per cent average inhibition in mycelial growth. Out of twelve plants evaluated for their efficacy, six effective plants Karu (Roylea elegans), Artemisia (Artemisia roxburghiana), Neem (Azadirachta indica), Bana (Vitex negundo), Tulsi (Ocimum sanctum) and Darek (Melia azedarach) were selected for making two botanical formulations (BF1 and BF2). While, BF1 was water based formulation and BF2 was cow urine based formulation. Among these botanical formulations, BF2 inhibited mycelial growth of white rot pathogen by 72.70 per cent and BF1 66.37 per cent at 100 % concentration. Whereas, among the tested fungicides, Score at 100 ppm concentration was found to be most effective with 75.01 % average inhibition in mycelial growth of the white rot pathogen.

scholarly journals INHIBITORY EFFECT OF DIFFERENT EUPATORIUMFORTUNEI TURCZ EXTRACTS ON THE GROWTH OF MICROCYSTIS AERUGINOSA

2018 ◽  
Vol 55 (4C) ◽  
pp. 103 ◽  
Author(s):  
Pham Thanh Nga
Keyword(s):  
Microcystis Aeruginosa ◽  
Optical Density ◽  
Plant Extracts ◽  
Inhibition Efficiency ◽  
Algal Bloom ◽  
Ethanol Extract ◽  
Environmental Problems ◽  
Inhibitory Effect ◽  
Attractive Alternative ◽  
Density Method

Blooms of freshwater cyanobacteria have caused increasing eco-environmental problems in recent years. Recently, plant extracts have been considered as attractive alternative algicides for algal bloom treatment. The present work presented the effect of three different extracts (ethanol, water and methanol) prepared from Eupatorium fortunei Turcz at concentrations of 500 and 200 µg/mL on the growth of Microcystisaeruginosain a 10-day experiment. By using optical density method, the ethanol extract at concentration of 500 µg/mL indicated the highest toxicity with the inhibition efficiency reaching 95.5 % after 10 days which was significantly greater than those of the water, methanol extracts at the same concentration and that of CuSO4 at 5 µg/mL (59.7 %, 66.5 % and 81,7 %, respectively). In addition, the pH of the algal suspensions was fluctuated from 6.0 to 7.0 for the control and extract-treated samples. In contrast, the pH of the CuSO4-treated suspension decreased to 5.0 - 5.5. These results proved that the E. fortunei Turcz ethanol extract had the best properties at 500 µg/mL in comparision with other extracts.

scholarly journals Effect of Schiff's Bases as Corrosion Inhibitors on Mild Steel in Sulphuric Acid

2007 ◽  
Vol 4 (3) ◽  
pp. 408-414 ◽  
Author(s):  
R. K. Upadhyay ◽  
S. P. Mathur
Keyword(s):  
Mild Steel ◽  
Sulphuric Acid ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Inhibitory Effect ◽  
Acid Solutions ◽  
Schiff’S Bases ◽  
Schiff's Bases ◽  
Maximum Inhibition ◽  
Good Agreement

Mass loss and thermometric methods have been used to study the corrosion inhibitory effect of synthesised Schiff's basesviz.N-(furfurilidine) – 4- methoxy aniline (SB1),N-(furfurilidine) – 4- methylaniline (SB2),N-(salicylidine) – 4- methoxy aniline (SB3),N-(cinnamalidine) – 4 –methoxy aniline (SB4) andN-(cinnamalidine) - 2-methylaniline (SB5) on mild steel in sulphuric acid solutions. Results show that both methods have good agreement with each other and inhibition efficiency depends upon the concentration of inhibitor as well as that of acid. Maximum inhibition efficiency is shown at highest concentration of Schiff's bases at the highest strength of acid.

Green corrosion protection for mild steel in acidic media: saponins and crude extracts of Gongronema latifolium

2019 ◽  
Vol 48 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Alexander I. Ikeuba ◽  
Peter C. Okafor
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Inhibitory Effect ◽  
Engineering Structures ◽  
Acid Media ◽  
Content Type ◽  
Extract Concentration ◽  
New Information ◽  
Inhibitive Action ◽  
Gongronema Latifolium

Purpose This paper aims to appraise the inhibitory effect of saponins extracted from Gongronema latifolium (SEGL) on mild steel in acid media. This is in a bid to conserve our environment and maintain the integrity of engineering structures and materials. Design/methodology/approach The corrosion inhibition of SEGL and ethanolic extracts of the leaves of G. latifolium (EEGL) on mild steel was studied by hydrogen evolution technique within a temperature range of 30-60°C in tetraoxosulphate (VI) acid solutions. Findings The extracts inhibit the corrosion of mild steel, and the inhibition efficiency depends on the concentration of the plant extract, temperature and the period of immersion. SEGL was comparatively more efficient than EEGL. Optimum values of the inhibition efficiency for both the EEGL and SEGL (93.7 and 96.5 per cent, respectively) were obtained at extract concentration of 10 g/L, whereas the least values were obtained at extract concentration of 0.5 g/L. Originality/value This paper provides new information on the possible application of isolated SEGL as an environmentally friendly corrosion inhibitor. The possible mechanism of the inhibitive action is also given.

scholarly journals Naproxen-Based Hydrazones as Effective Corrosion Inhibitors for Mild Steel in 1.0 M HCl

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 700 ◽  
Author(s):  
Maryam Chafiq ◽  
Abdelkarim Chaouiki ◽  
Mustafa R. Al-Hadeethi ◽  
Ismat H. Ali ◽  
Shaaban K. Mohamed ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Current Density ◽  
Mixed Type ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Corrosion Current ◽  
Inhibitory Effect ◽  
X Ray ◽  
Optimal Value ◽  
Inhibition Performance

The corrosion-inhibiting performance of (E)-N’-(4-bromobenzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (BPH) and (E)-N’-(4-(dimethylamino) benzylidene)-2-(6-methoxynaphthalen-2-yl) propanehydrazide (MPH) for mild steel (MS) in 1.0 M HCl was investigated using electrochemical methods, weight loss measurements, and scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscope (EDX) analysis. Raising the concentration of both inhibitors towards an optimal value of 5 × 10−3 M reduced the corrosion current density (icorr) and the corrosion rate of mild steel. The inhibitory effect of MPH, which showed the highest inhibition efficiency, was explored under a range of temperatures between 303 and 333 K. The inhibitory performance of both compounds significantly improved when the inhibitor concentration increased. The main result that flowed from potentiodynamic polarization (PDP) tests was that both compounds acted as mixed-type inhibitors, with a predominance cathodic effect. The adsorption of both compounds follows the Langmuir isotherm. SEM/EDX confirmed the excellent inhibition performance of tested compounds.

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