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.

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 Corrosion Inhibition of Mild Steel in Hydrochloric Acid by 2-Benzoylpyridine and Pyridoxolhydrochloride

2009 ◽  
Vol 6 (2) ◽  
pp. 385-394 ◽  
Author(s):  
A. O. James ◽  
N. C. Oforka ◽  
O. K. Abiola ◽  
B. I. Ita
Keyword(s):  
Hydrochloric Acid ◽  
Mild Steel ◽  
Inhibition Efficiency ◽  
Order Type ◽  
Acid Solutions ◽  
First Order ◽  
Hydrochloric Acid Solutions ◽  
Maximum Inhibition ◽  
The Difference ◽  
Kinetic Treatment

The inhibition of corrosion of mild steel in hydrochloric acid solutions by 2-benzoylpyridine (2BP) and pyridoxolhydrochloride (PXO) at 303K, 313K and 323K has been investigated using weight loss and hydrogen evolution techniques. 2BP exhibited higher maximum inhibition efficiency (78.99%) than PXO (71.93%). Generally inhibition was found to increase with increasing inhibitor concentration and decreasing temperature. A first order type of mechanism has been deduced from the kinetic treatment of the results and the process of inhibition was attributed to physisorption. The difference in the inhibition behaviour of the two compounds has been explained on the basis of structure dependent electron donor properties of the inhibitors

THE INHIBITORY EFFECT OF SOME BIPYRIDINE DERIVATIVES ON THE CORROSION BEHAVIOR OFN80 CARBON STEEL IN SULPHURIC ACID SOLUTIONS

2015 ◽  
Vol 22 (01) ◽  
pp. 1550007 ◽  
Author(s):  
XIA LIU ◽  
PETER C. OKAFOR ◽  
BIN JIANG ◽  
HONGXIANG HU ◽  
YUGUI ZHENG
Keyword(s):  
Carbon Steel ◽  
Sulphuric Acid ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Inhibitory Effect ◽  
Inhibition Mechanism ◽  
Acid Solutions ◽  
Chemical Parameters ◽  
Steel Electrode ◽  
C 30

The corrosion inhibition characteristics of 2,2′-bipyridine (BIPY) and 2,2′-bipyridine-3,3′-dicarboxylic acid (BIDA), on carbon steel in sulphuric acid solutions was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques at 20°C, 30°C and 40°C. The results indicate that the organic compounds inhibit the corrosion of mild steel in H2SO4solutions and the extent of inhibition increases with inhibitor concentration and decreases with temperature. A mixed-inhibition mechanism is proposed for the inhibitive effects of the compounds. The order of inhibition efficiency obtained was BIDA>BIPY. There is a good correlation between the quantum chemical parameters and experimentally determined inhibition efficiency of the inhibitors. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm. Morphological study of the carbon steel electrode surface was undertaken by scanning electron microscope (SEM) and the interfacial species formed on the surface in the presence of inhibitors analyzed by Infrared spectroscopy.

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 Isomers of Poly Aminophenol: Chemical Synthesis, Characterization, and Its Corrosion Protection Aspect on Mild Steel in 1 M HCl

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
G. Thenmozhi ◽  
P. Arockiasamy ◽  
R. Jaya Santhi
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Ammonium Persulfate ◽  
Inhibition Effect ◽  
Maximum Inhibition ◽  
Ft Ir ◽  
Polarization Studies

The oxidative chemical polymerizations of three isomers of aminophenol,ortho,meta, andpara(PoAP, PmAP, and PpAP), were performed in aqueous HCl using ammonium persulfate as an oxidant at 0–3°C. The synthesized polymers were characterized by employing elemental analysis, GPC, UV-VIS-NIR, FT-IR, XRD, and TGA. The corrosion inhibition effect of these three polymers on mild steel in 1 M HCl solution was studied by using electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. These measurements reveal that the inhibition efficiency obtained by these polymers increased by increasing their concentration. The inhibition efficiency follows the order PpAP > PoAP > PmAP. The results further revealed that PpAP at a concentration of 250 mg/L furnishes maximum inhibition efficiency (96.5%). Polarization studies indicated that these three polymers act as the mixed type corrosion inhibitors.

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.

scholarly journals Inhibitory Action ofBorassus FlabelliferLinn. (Palmyra Palm) Shell Extract on Corrosion of Mild Steel in Acidic Media

2010 ◽  
Vol 7 (3) ◽  
pp. 1055-1065 ◽  
Author(s):  
P. R. Vijayalakshmi ◽  
R. Rajalakshmi ◽  
S. Subhashini
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Measurement Techniques ◽  
Electrochemical Measurement ◽  
Inhibitory Effect ◽  
Industrial Processes ◽  
Acidic Media ◽  
Extract Concentration ◽  
Palm Shell ◽  
Maximum Inhibition

The inhibitory effect of extract obtained from destructive distillation of palmyra palm (Borassus flabelliferLinn.) shell on the corrosion of mild steel in 0.5 M H2SO4and 1 M HCl was investigated using weight loss and electrochemical measurement techniques. The results show that the inhibition efficiency increases with increase of palmyra palm shell extract concentration. The maximum inhibition efficiency in 0.5 M H2SO4and 1 M HCl was found to be 97.65% and 98.11% for a period of 24 h with 3%v/v concentration of the inhibitor respectively. Thermodynamic parameters were evaluated from temperature studies. Results were fitted into suitable adsorption isotherms. Electrochemical measurements infer that the extract acted through mixed mode of inhibition. Efforts were made to analyze the effectiveness of shell extract of palmyra palm in industrial processes.

scholarly journals Newly Synthesized N-Substituted Thiosemicarbazone as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl

2019 ◽  
Vol 7 (4.14) ◽  
pp. 168
Author(s):  
N Z. Nor Hashim ◽  
K Kassim ◽  
F H. Zaidon
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Langmuir Adsorption ◽  
Before And After ◽  
Ft Ir ◽  
L1 And L2

Two N-substituted thiosemicarbazone derivatives namely as 2-(4-chlorobenzylidene)-N-phenylhydrazinecarbothioamide and 2-benzylidene-N-phenylhydrazinecarbothioamide (L1 and L2, respectively) have been tested as corrosion inhibitors on mild steel in 1 M HCl. The ligands were synthesized and investigated using potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS).  The obtained results indicated that inhibition efficiency, (IE, %) L1 increased with increasing inhibitor concentrations which behaved as a good corrosion inhibitor compared to L2. The synthesized ligands were successfully characterized by melting point, elemental analysis (C, H, N, and S), Fourier-transform infrared spectroscopy (FT-IR) and NMR (1H and 13C) spectroscopy. The excellent inhibition effectiveness for both compounds on mild steel before and after immersion in 1 M HCl solution containing 40 ppm of L1 and L2 were also verified by scanning electron microscope (SEM). Based on potentiodynamic polarization results, it can be concluded that all investigated compounds are mixed-type inhibitors and obey the Langmuir adsorption isotherm. 

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