scholarly journals Some Polysorbate Compounds as Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid

2009 ◽  
Vol 5 (3) ◽  
pp. 830-838 ◽  
Author(s):  
Mohamed Sobhi ◽  
M. Abdallah ◽  
E. Hfaez
Keyword(s):  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Acid Corrosion ◽  
Hydrocarbon Chain ◽  
Langmuir Adsorption ◽  
Adsorption Free Energy ◽  
Hydrocarbon Chain Length ◽  
Polarization Studies

Some commercial non-ionic surfactants polysorbate, namely, polysorbate 80, polysorbate 40 and polysorbate 20, were tested as inhibitors for corrosion of C-steel in 2.0M HCl solution using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. It was found that all the three used compounds act as inhibitors for acid corrosion of C-steel. The inhibition efficiencies obtained by the three techniques were almost the same, and increase with increasing the hydrocarbon chain length and the surfactant concentration. The polarization studies show that these compounds act as mixed inhibitors. The inhibition action of these surfactants can be explained by their ability to adsorb on the metal surface making a barrier to mass and charge transfer.  It was found that the adsorption of these surfactants follows Langmuir adsorption isotherm. The negative values of  adsorption free energy indicating that the adsorption process is spontaneous and increases, for different surfactants, in the same direction as inhibition efficiency.

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. 

Corrosion inhibition of some azole derivatives on carbon steel in hydrochloric acid solution

2014 ◽  
Vol 61 (5) ◽  
pp. 300-306 ◽  
Author(s):  
B.P. Markhali ◽  
R. Naderi ◽  
M. Sayebani ◽  
M. Mahdavian
Keyword(s):  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Organic Compounds ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Acid Corrosion ◽  
Molecular Structures ◽  
Inhibition Mechanism ◽  
Content Type

Purpose – The purpose of this paper is investigate the inhibition efficiency of three similar bi-cyclic organic compounds, namely, benzimidazole (BI), benzotriazole (BTAH) and benzothiazole (BTH) on carbon steel in 1 M hydrochloric acid (HCl) solution. Organic inhibitors are widely used to protect metals in acidic media. Among abundant suggestions for acid corrosion inhibitors, azole compounds have gained attention. Design/methodology/approach – The inhibition efficiency of the three organic compounds was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Findings – Superiorities of BTH and BTAH corrosion inhibitors were shown by EIS data and polarization curves. Moreover, the results revealed that BTAH and BTH can function as effective mixed-type adsorptive inhibitors, whereas no inhibition behavior was observed for BI. Both BTAH and BTH obeyed Longmuir adsorption isotherm. The results obtained from this isotherm showed that both inhibitors adsorbed on the specimen surface physically and chemically. The difference in inhibition efficiencies of BTAH, BTH and BI was related to the presence of nitrogen and sulfur hetero atoms on their molecular structures. Originality/value – This study evaluated inhibition efficiency of BI, BTAH and BTH using electrochemical methods. In addition, the study attempted to find inhibition mechanism of the inhibitors and to find modes of adsorption of the inhibitors, correlating effects of heteroatoms and inhibition efficiency.

scholarly journals Inhibition of Pipeline Steel Corrosion in 0.5 M H2SO4 Using Cotyledon of Chrysophyllum Albidum

2020 ◽  
Vol 24 (4) ◽  
pp. 691-697
Author(s):  
E.P. Othaki ◽  
N.C. Ngobiri
Keyword(s):  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Pipeline Steel ◽  
Steel Corrosion ◽  
Langmuir Adsorption ◽  
Extract Concentration ◽  
Ir Studies ◽  
Ft Ir ◽  
As Adsorption

The corrosion inhibition characteristics of Chrysophyllum albidum cotyledon extract was studied as a green and sustainable corrosion inhibitors for pipeline steel in acidic environment attemperatures, 303,313 and 323K using gravimetric technique.The results obtained showed that the inhibition efficiency increased with increase in extract concentration but decrease with increase in temperature. The extract attained an inhibition efficiency of 94 % with 5 g/L at 303 K and 52.2 % with 1 g/L at 333K. Also increase in concentration of the extract lead to increase in activation energydepicting an exothermic process.Fourier transform infrared spectroscopy (FT-IR) studies showed the mode of inhibition as adsorption of phytochemicals from the extract on pipeline steel surface. Langmuir adsorption isotherm best fitted into the adsorption process which is spontaneous and physical. Keywords: Chrysophyllum albidum, Pipeline steel, Inhibition, Adsorption.

Effect of Andrographis paniculata (Burm.f.) Wall.ex Nees extract on corrosion of low C-steel in 0.1 M HCl

2016 ◽  
Vol 63 (6) ◽  
pp. 470-476 ◽  
Author(s):  
Pawin Wongkhamprai ◽  
Manthana Jariyaboon
Keyword(s):  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Andrographis Paniculata ◽  
Low Carbon ◽  
Content Type ◽  
Langmuir Adsorption ◽  
Green Corrosion Inhibitor ◽  
Corrosion Inhibition Efficiency ◽  
Environmentally Friendly Method

Purpose The aim of this work was to investigate how Andrographis paniculata (Burm.f.) Wall.ex Nees extract affected the corrosion of low-carbon (C) steel in 0.1M HCl. Design/methodology/approach The Andrographis paniculata (Burm.f.) Wall.ex Nees was extracted into distilled water at 70°C for 1 h. The corrosion inhibition efficiency of the extract was determined in 0.1M HCl using weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy. The effects of extract concentrations and of temperature were investigated. Findings The Andrographis paniculata (Burm.f.) Wall.ex Nees extract could inhibit the corrosion process of low-C steel in 0.1M HCl. With the extract concentration of 1 g/l, an inhibition efficiency of 96.3 per cent was obtained. The extract acted as an anodic inhibitor. The adsorption process of the extract was physisorption and it followed the Langmuir adsorption isotherm. Originality/value This paper revealed that Andrographis paniculata (Burm.f.) Wall.ex Nees cultivated in Thailand, which was extracted using a simple and environmentally friendly method, could act as a very good green corrosion inhibitor for low-C steel in 0.1M HCl solution.

scholarly journals GREEN INHIBITORS FOR CORROSION PROTECTION OF N80 CARBON STEEL IN 1M HCl AQUEOUS SOLUTIONS

2012 ◽  
Vol 20 (20) ◽  
pp. 77-98
Author(s):  
A. H. EL-ASKALANY ◽  
S. I. MOSTAFA ◽  
A. M. EID
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Physical Adsorption ◽  
Polarization Studies ◽  
Inhibitive Action ◽  
Good Agreement

The inhibitive action of Saponinic extract of both Zygophylium album and Zygophylium Egyptian leaves which could serve as eco-friendly materials was investigated on the corrosion of N80 carbon steel in 1 M HCl solution. The techniques employed for the study were weight loss measurements. potentiodynamic polarization, electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS). The results obtained show that these extracts could serve as an effective inhibitor for N80 carbon steel. The percentage inhibition increases with increasing concentration of the inhibitor at 25 °C The percentage inhibitor efficiency above 90% was obtained at a concentration of 700 ppm for both extracts. The corrosion rates of steel and inhibitive efficiencies obtained from impedance and polarization measurements were in good agreement with those obtained from weight loss measurements. Potentiodynamic polarization studies clearly reveal that both extracts act as mixed-type inhibitors The study shows that the inhibition efficiency decreased with the temperature rise of the medium. Heat of adsorption and thermodynamic parameters and indicated that the adsorption process is mainly controlled by the physical adsorption process.

Hydroxamic Acid Corrosion Inhibitor for Steel in Aqueous Solution

2007 ◽  
Vol 537-538 ◽  
pp. 81-88 ◽  
Author(s):  
Abdulmajed Alagta ◽  
Ilona Felhősi ◽  
Erika Kálmán
Keyword(s):  
Aqueous Solution ◽  
Hydroxamic Acid ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Acid Corrosion ◽  
Hydrocarbon Chain ◽  
Protective Film ◽  
Compact Layer ◽  
Acid Corrosion Inhibitor ◽  
Neutral Aqueous Solution

The selected dihydroxamic acid derivatives, namely oxalyl-dihydroxamic acid (C2) and pimeloyl-1,5-di-hydroxamic acid (C7) have been synthesized and evaluated as corrosion inhibitors for carbon steel in neutral aqueous solution by potentiodynamic polarization and ac impedance methods. C2 molecule acts as good inhibitor with inhibition efficiency value reached 91%; it is well adsorbed most likely throughout the two hydrophilic groups, and forms a protective film on the metal surface. C7 has moderate inhibition efficiency probably due to the presence of long single hydrocarbon chain in the molecule, negatively affect the adsorption process. Addition of Ni2+ to C7 significantly improve the inhibition efficiency, throughout the formation of a dense compact layer of complexes between Ni2+ and C7.

Corrosion Inhibition of Mild Steel in 0.5N H2SO4 Solution by Tribulus terrestris (fruit) Extract

2017 ◽  
Vol 33 (1-2) ◽  
pp. 63
Author(s):  
Suchitra Chaudhary ◽  
Rakesh K. Tak ◽  
Rajendra Kumar Duchaniya
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Tribulus Terrestris ◽  
Alcoholic Extract ◽  
Fruit Extract ◽  
Langmuir Adsorption ◽  
Corrosion Inhibition Efficiency

The corrosion inhibition efficiency of alcoholic extract of fruits of plant <em>Tribulus terrestris</em> for mild steel in 0.5N H<sub>2</sub>SO<sub>4</sub> solution has been studied in relation to concentration of inhibitor by Mass Loss, Potentiodynamic Polarisation and Electrochemical Impedance Spectroscopy methods. The results indicate that <em>Tribulus terrestris</em> fruit extract used in liquid H<sub>2</sub>SO<sub>4</sub> effectively reduces the corrosion rate of mild steel and act as a good corrosion inhibitor. It is also observed that inhibition efficiency increases with inhibitor concentration but it decreases with increase in temperature. The thermodynamic parameters reveal that the inhibition of corrosion is due to adsorption of the inhibitor on the metal surface. The negative free energy values show spontaneity of the adsorption process in accordance with Langmuir adsorption isotherm.

scholarly journals Fatty Amidine as Copper Corrosion Inhibitor

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zainal Alim Mas’ud ◽  
Noviyan Darmawan ◽  
Januari Dawolo ◽  
Yusuf Bramastya Apriliyanto
Keyword(s):  
Corrosion Inhibitor ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Copper Surface ◽  
Langmuir Adsorption Isotherm ◽  
Copper Corrosion ◽  
Langmuir Adsorption ◽  
New Type ◽  
Corrosion Inhibition Efficiency

The development of green and sustainable corrosion inhibitors for copper in a corrosive marine environment is highly desired. Herein, we studied the fatty acid-based amidine as the new type of renewable corrosion inhibitor. Stearamidine salt was used as a model inhibitor, and it was synthesized through stearonitrile intermediate with an excellent isolated yield of 88%. We used electrochemical (potentiodynamic polarization) and morphological (scanning electron microscopy) measurements to assess the corrosion inhibition efficiency of stearamidine in 3.0 wt.% NaCl at 300 K. We show that, in such a condition, the optimum inhibition efficiency of 96% was achieved using only 0.2 mM stearamidine. The results suggested the fatty amidine is a promising corrosion inhibitor for copper that is suitable in the saltwater ecosystem. The thermodynamic parameters of the interaction between the stearamidine and the copper surface were determined, and the result suggests that the adsorption process occurred accordingly with the Langmuir adsorption isotherm and involved both physisorption and chemisorption.

scholarly journals Betalain: A Particular Class of Antioxidant Pigment

2011 ◽  
Vol 6 (10) ◽  
pp. 1934578X1100601
Author(s):  
Hasna El Gharras
Keyword(s):  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Protective Agent ◽  
Free Energy Of Adsorption ◽  
Langmuir Adsorption ◽  
First Order ◽  
Degradation Rates ◽  
The Stability ◽  
Inhibitive Action

We have analyzed the stability of betalains in juices prepared from Moroccan yellow cactus pears ( Opuntia ficus indica (L.) Mill.) as a function of temperature and pH. The experiments were carried out at temperatures ranging from 80 to 100°C with juices at pH 3.5, 5 and 6.5. The degree of pigment retention decreased when the temperature increased. The degradation constant rates were determined for thermal degradation rates of pseudo-first order. The Arrhenius plot obtained for the degradation of betaxanthin from the yellow fruits was not linear. Regardless of the temperature of treatment, the lowest degradation was obtained for pH 5. When some stabilizers were tested for the protection of pigments, the results showed that ascorbic acid was a better protective agent at pH 3.5, increasing the protection by 40%. The inhibitive action of betalain pigments extracted from cactus pears towards corrosion of stainless steel in phosphoric acid was investigated using electrochemical polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that the presence of natural pigments reduces the corrosion rate of the tested metal, especially on addition of the red pigments (97%). The inhibition efficiency increases as the pigment concentration of extracts increases. It was also found that the pigments tested act as mixed inhibitors. The inhibitive action of the extracts is discussed in term of adsorption and that such adsorption follows a Langmuir adsorption isotherm. The calculated values of the free energy of adsorption indicated that the adsorption process is spontaneous.

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.

Sign in / Sign up

Export Citation Format

Share Document