scholarly journals Inhibition of Aluminium Corrosion in Hydrochloric Acid Using Nizoral and the Effect of Iodide Ion Addition

2010 ◽  
Vol 7 (3) ◽  
pp. 837-843 ◽  
Author(s):  
I. B. Obot ◽  
N. O. Obi-Egbedi
Keyword(s):  
Free Energy ◽  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Aluminium Alloy ◽  
Acidic Medium ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Considerable Extent ◽  
Inhibitor Concentration ◽  
Hcl Solution

The effect of nizoral (NZR) on the corrosion inhibition of aluminium alloy AA 1060 in 2 M HCl solution was investigated using the mylius thermometric technique. Results of the study revealed that nizoral acts as corrosion inhibitor for aluminium in the acidic medium. In general, at constant acid concentration, the inhibition efficiency increases with increase in the inhibitor concentration. The addition of KI to the inhibitor enhanced the inhibition efficiency to a considerable extent. The adsorption of nizoral onto the aluminium surface was found to obey the Fruendlich adsorption isotherm. The value of the free energy for the adsorption process shows that the process is spontaneous.

scholarly journals A thermometric study on the kinetics of the acid dissolution of aluminium in the presence of Napoleonaea imperialis seeds extract and iodide ions

2018 ◽  
Vol 29 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Habibat Faith Chahul ◽  
Gloria Ihuoma Ndukwe ◽  
David Ogwu Ogwu
Keyword(s):  
Free Energy ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Seed Extract ◽  
Considerable Extent ◽  
Acid Dissolution ◽  
Iodide Ions ◽  
Langmuir Adsorption ◽  
Kinetics Of

Abstract The dissolution of aluminum alloy AA 1060 in 0.5 M and 1.0 M HCl was investigated using thermometric measurements. The reaction number of the aluminum coupons varied linearly with the concentration of the acid. Addition of Napoleonaea imperialis seed extract to the dissolving aluminium coupons lowered the reaction number in both concentrations of HCl by inhibiting the dissolution process. The inhibition efficiency of Napoleonaea imperialis seed extract was enhanced to a considerable extent in the presence of iodide ions with the synergistic parameter S > 1. The adsorption of Napoleonaea imperialis extract on the aluminium surface best aligned with the Langmuir adsorption isotherm model. The values of the free energy, ΔGadsfor the adsorption process revealed the process to be spontaneous and physisorptive.

POLYVINYLPYROLLIDONE AND POLYACRYLAMIDE AS CORROSION INHIBITORS FOR MILD STEEL IN ACIDIC MEDIUM

2008 ◽  
Vol 15 (03) ◽  
pp. 277-286 ◽  
Author(s):  
S. A. UMOREN ◽  
I. B. OBOT
Keyword(s):  
Adsorption Isotherm ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Acidic Medium ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Activation Parameters ◽  
Temkin Adsorption Isotherm

The corrosion inhibition of mild steel in 1 M H 2 SO 4 in the presence of polyvinylpyrollidone (PVP) and polyacrylamide (PA) as inhibitors at 30–60°C was studied using gravimetric and gasometric techniques. The inhibition efficiency (1%) increased with increase in concentration of the inhibitors. Increase in temperature increased the corrosion rate in the absence and presence of inhibitors but decreased the inhibition efficiency. Both PVP and PA were found to obey Temkin adsorption isotherm and Kinetic-Thermodynamic Model of El-Awady at all the concentrations and temperatures studied. Phenomenon of physical adsorption is proposed from the activation parameters obtained. Thermodynamic parameters reveal that the adsorption process is spontaneous. PVP was found to be a better inhibitor than PA.

Corrosion Inhibition of 304L Stainless Steel by Dicyclohexyl Thiourea in HCl Solution

2011 ◽  
Vol 239-242 ◽  
pp. 1901-1906
Author(s):  
Chang Bin Shen
Keyword(s):  
Stainless Steel ◽  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Inhibition Efficiency ◽  
Acidic Solution ◽  
304L Stainless Steel ◽  
Potentiodynamic Polarization Curve ◽  
Inhibiting Effect ◽  
Different Temperatures ◽  
Hcl Solution

At four different temperatures, by potentiodynamic polarization curve, the inhibiting effect of dicyclohexyl thiourea (DCTU) on the corrosion behavior of 304L stainless steel in 2 M hydrochloric acid solution was investigated. The result indicated that DCTU acted as an efficient anodic inhibitor for the corrosion of 304L SS. Excellent inhibition efficiency was evident in the acidic solution and found to vary with temperature and concentration of the inhibitor. The adsorption of this compound on the 304L SS surface was found to obey Temkeins adsorption isotherm and the inhibition was governed by chemisorption mechanism. The deduced thermodynamic parameters of adsorption revealed a strong interaction and spontaneous adsorption of DCTU on the metal surface.

Anti-Corrosive Effect of Jordanian-Bay- Leaves Aqueous Extract on Mild Steel in 1.0 M Hydrochloric Acid Solution

2021 ◽  
Vol 17 ◽  
pp. 614-618
Author(s):  
Nawal H. Bahtiti ◽  
Ibrahim Abdel-Rahaman
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Aqueous Extract ◽  
Corrosion Inhibitors ◽  
Polarization Technique ◽  
Corrosive Effect ◽  
The Impact ◽  
Natural Inhibitors ◽  
Temkin Adsorption Isotherm ◽  
Hcl Solution

Natural inhibitors are the most crucial manner to lessen the corrosion price of various business metals. There are several strategies being used with corrosion inhibitors. One technique being used is the Electrochemical strategies. The gain with this technique is their brief size time and mechanistic information. It is beneficial in the corrosion's layout safety techniques besides the layout of the brand new inhibitors, there are 3 styles of corrosion inhibitors as anodic inhibitors, cathodic inhibitors, over one inhibitor. The corrosion inhibition of slight metallic in 1.0 M HCl solution with the aid of using Jordanian -Bay- leaves extract has been studied with the use of potentiodynamic polarization technique. Results received a display that Bay- leaves aqueous extract behaves as an anodic inhibitor for slight metallic in 1.0 M HCl solution. The inhibitor capabilities thru adsorption following Temkin adsorption isotherm. The impact of parameters like temperature and inhibitor awareness at the corrosion of slight metallic has additionally been studied.

scholarly journals Electrochemical and Surface Morphological Studies of Carbon Steel Corrosion by a Novel Polynuclear Schiff Base in HCl Solution

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
K. S. Shaju ◽  
K. Joby Thomas ◽  
Vinod P. Raphael ◽  
Aby Paul
Keyword(s):  
Weight Loss ◽  
Schiff Base ◽  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Acid Solution ◽  
Corrosion Inhibition ◽  
Hydrochloric Acid Solution ◽  
Inhibition Efficiency ◽  
Morphological Studies

The corrosion inhibition efficiency of a potential polynuclear Schiff base, (s)-2-(anthracene-9 (10H)-ylidene amino)-5-guanidinopentanoic acid (A9Y5GPA), on carbon steel (CS) in 1 M hydrochloric acid solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization studies. The corrosion inhibition efficiencies of parent amine [(s)-2-amino-5-guanidinopentanoic acid] and parent ketone (anthracene-9 (10H)-one) on carbon steel in 1.0 M hydrochloric acid solution have also been investigated using weight loss studies. The electrochemical and weight loss data established that the inhibition efficiency on CS increases with the increase in the concentration of inhibitor, A9Y5GPA. The adsorption of A9Y5GPA obeys the Langmuir adsorption isotherm. Thermodynamic parameters (Kads, ΔGads0) were calculated using the adsorption isotherm. Activation parameters of the corrosion process (Ea, ΔH* and ΔS*) were also calculated from the corrosion rates obtained from temperature studies. Tafel plot analysis revealed that A9Y5GPA acts as a mixed-type inhibitor. A probable inhibition mechanism was also proposed. Surface morphology of the carbon steel specimens in the presence and absence of the inhibitor was evaluated by SEM analysis.

Inhibition Effect of N-Octyl-2-Pyrrolidonium Chloride on the Corrosion of Mild Steel in Acidic Medium

2013 ◽  
Vol 634-638 ◽  
pp. 651-654
Author(s):  
Zi Chong Zhuang ◽  
Bao Hua Huang ◽  
Jun Liu ◽  
Yu Jing Lu ◽  
Zhan Chang Pan ◽  
...  
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Acidic Medium ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Electrochemical Techniques ◽  
Inhibition Mechanism ◽  
Inhibition Effect ◽  
Hcl Solution ◽  
Mixed Type Inhibitor

A new ionic liquid, N-octyl-2-pyrrolidonium chloride (NOPC), were synthesized and evaluated as inhibitors for mild steel (Q235) corrosion in 1 mol/L HCl. The adsorption behavior and corrosion inhibition mechanism of NOPC for mild steel in HCl solution were investigated by using weight loss measurements, electrochemical techniques, and SEM. The inhibition efficiency increases with the increasing concentration of NOPC in 1 mol/L HCl and decreases as the temperature increases. The results indicate that NOPC is able to function as a mixed type inhibitor.

scholarly journals Inhibitory action of Vernonia amygdalina extract (VAE) on the corrosion of carbon steel in acidic medium

2017 ◽  
Vol 7 (3) ◽  
pp. 145 ◽  
Author(s):  
Olamide Olawale ◽  
Adesoji Adeolu Adediran ◽  
Segun Isaac Talabi ◽  
Geraldine Chika Nwokocha ◽  
Alewo Opuada Ameh
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Acidic Medium ◽  
Inhibitory Action ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Vernonia Amygdalina ◽  
Protective Oxide ◽  
Mild Carbon Steel ◽  
Stem Extract

<p class="PaperTitle"><span lang="EN-GB">This study investigates the inhibition potential of Vernonia amygdalina stem extract (VAE) on the corrosion of mild carbon steel immersed in 1 M HCl solution containing various concentrations of the inhibitor. The corrosion rate and inhibition efficiency were evaluated using mass loss and adsorption techniques. The results revealed that VAE efficiently inhibits the corrosion rate of mild carbon steel immersed in the acidic medium. The concentration of 0.6 g/L provides the highest inhibition efficiency of 78.1 %. The adsorption process was consistent with the physisorption mechanism and obeyed the Langmuir isotherm. The functional groups responsible for inhibition were identified using Fourier Transform Infrared (FTIR) spectra. The surface morphology of the corroded samples examined with Scanning Electron Microscope (SEM) revealed the presence of protective oxide layer. Inhibition efficiency was found depended on the presence of oxalate, phytate, tannins, saponins and flavonoids in the VAE. It has been concluded that VAE is safe, cheap and efficient corrosion inhibitor for mild carbon steel.</span></p>

scholarly journals Study of Kinetics and Inhibition Efficiency by Isoquinoline-5-Carboxaldehyde for Carbon Steel Corrosion in HCl

2020 ◽  
Vol 55 (3) ◽  
Author(s):  
Raheem A.H. Al-Uqaily ◽  
Subhi A. Al-Bayaty ◽  
Sattar O. Maiws Al-Mayyahi
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Metal Surface ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Steel Corrosion ◽  
Hydrogen Gas ◽  
Gas Evolution ◽  
Film Layer

In this paper, a study of kinetics and inhibition efficiency by isoquinoline-5-carboxaldehyde of carbon steel corrosion in hydrochloric acid is conducted. The method of weight loss and hydrogen gas evolution was used with various inhibitor concentrations ranging from 150-450 parts per million with several temperatures from 40-60°C. Our results showed that increasing inhibitor concentrations and temperature led to an increase in the inhibition efficiency; this indicates both the adsorption of a film layer on a metal surface and the efficacy of the inhibitor by the attendance of oxygen and nitrogen atoms that have an active part in the adsorption process. In this study entropy, activation, and enthalpy energy were calculated.

scholarly journals COVID-19 Vaccine, Contraceptive, Viscosity and Safety Margin Change

2021 ◽  
Vol 11 (2) ◽  
pp. 3509-3512
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Safety Margin ◽  
Steel Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Langmuir Adsorption ◽  
Mild Steel Corrosion ◽  
Hcl Solution

The temperature effect of 4-ethyl-1-(4-oxo-4-phenylbutanoyl)thiosemicarbazide (EOPT) on the mild steel corrosion in 1 M HCl solution was studied by gravimetric techniques at temperatures varying from 303 to 333 K. The investigated inhibitor concentrations were started from 100 ppm and ended with 500 ppm. The inhibition efficiency increased with the increase of the concentration of the inhibitor and reached 96.1% with the concentration of 500 ppm at 303 K and decreased to 66.3% at 333 K. Moreover, the inhibition efficiencies decreased with the temperature increase for both acids. Using the Langmuir adsorption isotherm for the adsorption of this inhibitor on the mild steel surface was determined. EOPT was found to be an efficient corrosion inhibitor due to its structural molecules, which contain sulfur, nitrogen, and oxygen, hetero atoms an addition to the aromatic ring.

scholarly journals Isotherm Studies of the Biosorption of Pb (II) and Cu (II) Using Chicken Feather

2018 ◽  
pp. 1-9
Author(s):  
Salaudeen Abdulwasiu Olawale ◽  
Abdulrahman Wosilat Funke ◽  
Aliyu Haruna Dede ◽  
Abudukadiri Habeeb
Keyword(s):  
Free Energy ◽  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Chemical Properties ◽  
Isotherm Model ◽  
Maximum Adsorption Capacity ◽  
Chicken Feather ◽  
Biosorption Process ◽  
Physico Chemical

This study was carried out to examine the adsorption isotherm (Langmuir, Freundlich, Temkin, and Dubinin Radushkevich adsorption isotherm) of Pb(II) and Cu(II) in order to determine the  maximum adsorption capacity of chicken feather, CF. Equilibrium sorption of Pb(II) and Cu(II) using homogeneously sized Chicken Feather (CF) was carried out and the physico-chemical properties of the feathers were determined. Results revealed that the maximum biosorption capacity of Pb(II) and Cu(II) by the chicken feather from Langmuir isotherm model were 79.36 and 61.92 mg/g respectively. Separation factor RL were 0.195 and 0.018 indicating a favourable adsorption process. Mean free energy (E) from Dubinin Radushkevich isotherm model were 1.291 and 0.102 KJ/mol for Pb(II) and Cu(II) respectively, indicating a physical adsorption process. Negative standard Gibbs free energy (ΔG) obtained indicated that the Pb(II) biosorption process was spontaneous and thermodynamically feasible.

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