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>

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 BEHAVIOR OF CARBON STEEL WITH HMTA INHIBITOR IN PICKLING PROCESS

2007 ◽  
Vol 14 (06) ◽  
pp. 1067-1071 ◽  
Author(s):  
D. LIU ◽  
L. P. HUANG
Keyword(s):  
Surface Roughness ◽  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Immersion Time ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Free Energies ◽  
Pickling Process ◽  
Hydrogen Evolution Reactions

In this investigation, attempts have been made to study the inhibitive effect of hexamethylenetetramine (HMTA) on carbon steel in 10% HCl (mass%) by weight loss, potentiodynamic polarization, EIS, and AFM. Results indicate that inhibition efficiency (IE) of HMTA increases with the increase in pickling immersion time from 10 to 60 min, and IE also increases with the increase in temperature. At higher temperatures (80°C), the IE values are higher and almost independent of pickling time. HMTA can be adsorbed on the surface of metal and reduce the corrosion rate of metal. HMTA is a kind of mixed inhibitor and can retard both the anodic dissolution and cathodic hydrogen evolution reactions independently. IE increases with the concentration of HMTA. Electrochemistry measurement shows that adsorption follows the Langmuir isotherm and the value of free energies of adsorption (ΔG ads ) is < 0, so the adsorption process can occur automatically. AFM analyses show HMTA can affect the surface roughness and protect metal.

scholarly journals Study the corrosion inhibition of mix of caffeine and iodua for CT3 steel in 1M HCl solution by electrochemical methods

2017 ◽  
Vol 33 (3) ◽  
Author(s):  
Truong Thao
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Electrochemical Methods ◽  
Anodic Reaction ◽  
Mild Carbon Steel ◽  
Current Densities ◽  
Hcl Solution ◽  
Surface Observations

Abstract: Corrosion inhibition of mild carbon steel, CT3,  in 1.0 M HCl solution by iodide  (with different concentrations, from 0.1g/l to 5.0g/l), mix of caffeine and iodide was investigated by electrochemical methods and micro surface observations (SEM). Experiment result showed that: (1) as the concentration of iodide increases, the inhibition efficiency increases;  Iodide acts as a mix – type inhibitor but inhibits anodic reaction is predominant. (2) Mix of 1.0 g/l iodide ang caffeine acts as a typical mix – type inhibitor. the current densities of both of anodic and cathode are decline when concentration of caffeine is 1.0 g/l or more. Inhibition efficiency max is approximately 96% at concentration of 5.0 g/l caffeine, the inhibition efficiency maintained relatively stable within 5 days.  

scholarly journals CORROSION BEHAVIOR OF STEEL IN ACIDIC MEDIUM FOR PETROLEUM SYSTEMS

2020 ◽  
Vol 1 (2) ◽  
pp. 25-26
Author(s):  
M.A. Fajobi ◽  
R.T. Loto ◽  
O.O. Oluwole
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Acidic Medium ◽  
316L Stainless Steel ◽  
Electrochemical Reaction ◽  
General Corrosion ◽  
Chromium Alloy ◽  
High Corrosion Resistance ◽  
Loss Analysis ◽  
Petroleum Systems

The electrochemical reaction response of austenitic 316L stainless steel and carbon steel was examined through weight loss analysis in 1M, 2M and 3M of HCl acid. The results show that austenitic 316L has high corrosion resistance than carbon steel for the test analyzed with the lowest corrosion rate of 0.0018mm/y at 1M of HCl and highest at 0.0053mm/y when compared with carbon steel which has the lowest corrosion rate of 0.0003mm/y for 1M of HCl and highest at 0.0013 mm/y of 3M of HCl solution all at ambient temperature conditions. General corrosion was displayed on the surface of the carbon steel but austenitic 316L was not affected due to the presence of chromium alloy and other alloying elements.

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.

scholarly journals Evaluation of Inhibitive Performance of Acidic Extract of Eichornia Crassipeson Corrosion of Low Carbon Steel in 1M Sulphuric Acid Solution

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Sidikat I Kuye ◽  
Emmanuel Amaechi ◽  
Nurudeen O Adekunle ◽  
Olayide R Adetunji ◽  
Alex F Adisa ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Acid Solution ◽  
Sulphuric Acid ◽  
Eichhornia Crassipes ◽  
Inhibition Efficiency ◽  
Low Carbon Steel ◽  
Gravimetric Method ◽  
Sulphuric Acid Solution ◽  
Low Carbon

Corrosion inhibition potential of Eichhornia crassipes extract on low carbon steel in 1 M sulphuric acid solution was investigated using gravimetric method and corrosion rate. The experiment was carried out for 3 hours at different concentration of Eichhornia crassipes extract and temperatures of 26.6°C, 40°C and 60°C. Arrhenius and improved Arrhenius equations were used to determine the thermodynamics properties of the reaction while the nature of the reaction was proposed by adsorption isotherms. The results showed that corrosion rate decreased in the presence of the extract except in 60oC. Inhibition efficiency also increased with extract concentration with the highest (82%) occurring at room temperature and 5% concentration. Inhibition efficiency decreased with increase in temperature with almost no inhibition at 60oC, this is associated with physisorption. Activation energy () and activation enthalpy () both had positive values and they increased in the presence of Eichhornia crassipes extract, those for inhibited solution were higher than those for uninhibited solution, these can also be attributed to physisorption. Inhibition  reaction obeyed Langmuir adsorption isotherm. Gibbs free energy () calculated for the reaction is -8.509 to -11.767 kJ mol-1.

N-(3-(Dimethyl benzyl ammonio)propyl)alkanamide chloride derivatives as corrosion inhibitors for mild steel in 1 M HCl solution: experimental and theoretical investigation

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 39784-39800 ◽  
Author(s):  
Samy M. Shaban
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Mild Steel ◽  
Theoretical Investigation ◽  
Cationic Surfactants ◽  
Acidic Medium ◽  
Corrosion Inhibitors ◽  
Mild Carbon Steel ◽  
Dimethyl Benzyl ◽  
Hcl Solution

The effects of the synthesized cationic surfactants corrosion inhibitiors DMBL, DMBM and DMBP on the corrosion of mild carbon steel in acidic medium (1.0 M HCl) were investigated using weight loss and electrochemical measurements.

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 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.

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