scholarly journals Parkia biglobosa (African Locust Bean) Pulp as a Green Inhibitor for Mild Steel Corrosion

2019 ◽  
pp. 1-11
Author(s):  
O. M. Myina ◽  
E. G. Obed ◽  
E. O. Babatunde
Keyword(s):  
Mild Steel ◽  
Alkaline Medium ◽  
Inhibition Efficiency ◽  
Standard Free Energy ◽  
Steel Corrosion ◽  
Alkaline Media ◽  
Parkia Biglobosa ◽  
Green Inhibitor ◽  
Optimum Dosage ◽  
Mild Steel Corrosion

This work investigated corrosion inhibition potential of Parkia biglobosa (P. biglobosa) pulp on mild steel in 1.0 M HCl and 0.1M NaOH aqueous solutions at 301 and 321 K, aimed at converting a cellulosic renewable waste into an environmentally friendly answer to the challenge of mild steel corrosion, especially in chemical industries. Weight loss of mild steel coupons over a period of 120 hrs. were measured at varying concentrations (0.0-7.5 g/L) of P. biglobosa pulp. The data did not strictly fit the Langmuir isotherm, having a slope greater than unity and suggesting that adsorbing species from P. biglobosa pulp occupied more than one active site. This was collaborated by the quantum chemical parameters evaluated. Results of the investigations showed that P. biglobosa pulp is a good green inhibitor for mild steel corrosion in both acidic and alkaline media. An optimum dosage of 4.5 g/L resulted to 85.73 % inhibition efficiency () at 301 K while at 321 K, the optimum dosage was 1.0 g/L of the pulp with an inhibition efficiency ≈ 50 % and 55 % in the acidic and alkaline medium respectively. The  values decreased with increase in temperature and were strongly collaborated by values (- 0.86 Lcm-2h-1 at 301 K and - 0.498/0.55 Lcm-2h-1 at 321 K) of order (b) of the reaction. The corrosion reaction showed a large rate constant ( and  in acidic and alkaline medium respectively) at ambient temperature; reflecting the fast nature of the process. Values of the standard free energy of adsorption () were negative for the process both at ambient and elevated temperature indicative of a spontaneous process and stable layer of adsorption. These values were less than – 40 kJmol-1, suggestive of a physisorption mechanism. This was collaborated by higher adsorption activation energy () in presence of the inhibitor than in its absence.

scholarly journals Inhibitive Effect of Costus afer Extracts on Mild Steel Corrosion in Acidic Medium

2016 ◽  
Vol 7 ◽  
pp. 60-67
Author(s):  
Lebe A. Nnanna ◽  
Wisdom O. John ◽  
Tochukwu E. Esihe ◽  
Kelechi C. Denkoro ◽  
Victor I. Okparaku ◽  
...  
Keyword(s):  
Mild Steel ◽  
Room Temperature ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Inhibition Effect ◽  
A Value ◽  
Mild Steel Corrosion ◽  
Costus Afer

Inhibition effect of Costusafer on mild steel in 0.5 M HCl was studied using gravimetric method at room temperature. It was found out that Costusafer inhibited the corrosion of mild steel in the acidic environment and that the efficiency of inhibition increased as the concentration of the inhibitor in the environment increased. The data was used to test different isotherms and it suited the Langmuir isotherm. A value of -15.995 kJmol-1 was gotten for the ∆Goads. This value showed that the extracts of Costusafer inhibited the corrosion process through physiosorption mechanism. The high value of inhibition efficiency of the extract as the concentration increased in rationalized in terms of the increase in herteroatoms, saponnins and tannins which are present in the extract.

scholarly journals Benzylidene as Efficient Corrosion Inhibition of Mild Steel in Acidic Solution

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 27
Author(s):  
Shaimaa B. Al-Bghdadi ◽  
Mahdi M. Hanoon ◽  
Jafer F. Odah ◽  
Lina M. Shaker ◽  
Ahmed A. Al-Amiery
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Steel Corrosion ◽  
Solution Temperature ◽  
Acidic Environment ◽  
Mild Steel Corrosion ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Steel Coupon

A New benzylidene derivative namely benzylidene-5-phenyl-1,3,4-thiadiazol-2-amine (BPTA), was successfully synthesized and characterized using Fourier Transform Infrared Spectroscopy, Nuclear Magnetic Resonance and elemental analysis (CHN) techniques. The inhibition efficiency of BPTA on mild steel corrosion in 1.0 N HCl was tested at various temperatures. The methodological work was achieved by gravimetric method complemented with morphological investigation. The concentrations of inhibitor were 0.1, 0.2, 0.3, 0.4 and 0.5 mM at the temperatures 303, 313, 323 and 333 K. The BPTA, molecules as become superior corrosion inhibitor with 92% inhibition efficiency of mild steel coupon in the acidic environment. The inhibition efficiency increased with increasing concentrations of BPTA and the excellent efficiency was performed with the 0.5 mM concentration and followed with 0.4 mM. In acidic environment, the 0.5 and 0.4 mM gave the optimum performance with weight loss technique and scanning electron microscopy analysis. On the other hand, the inhibition efficiency decreased with the increase of temperature. Results of BPTA indicated mixed type inhibitor and the adsorption on the mild steels surface obeys the Langmuir adsorption isotherm. It was found that the BPTA performance depend on the concentration and the solution temperature. Quantum chemical calculations have been done to correlate the electronic characteristics of BPTA with the corrosive inhibitive impact. Experimental and theoretical results are in good agreement.

scholarly journals Mitigation of Mild Steel Corrosion in Acidic Solution Using Inhibitor

2011 ◽  
Vol 8 (s1) ◽  
pp. S53-S60 ◽  
Author(s):  
M. Vishnudevan
Keyword(s):  
Mild Steel ◽  
Sodium Benzoate ◽  
Inhibition Efficiency ◽  
Acidic Solution ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Trisodium Citrate ◽  
Tafel Polarization ◽  
Mild Steel Corrosion ◽  
Maximum Inhibition

The inhibition efficiency of mild steel corrosion in HCl acidic solution containing various concentrations of mixed inhibitors were evaluated by conducting Tafel polarization and electrochemical impedance studies. The mixed inhibitors used in this present investigation were trisodium citrate and sodium benzoate. In this present investigation 0.01 N to 0.1 N concentrations of HCl was used at 30°C. Sodium benzoate present in the mixed inhibitive system enhanced the inhibition efficiency through chemisorptions. The maximum inhibition efficiency ( 95.4%) was obtained for the mixed inhibitive system containing 0.05 M citrate and 0.5 M benzoate in 0.1 N HCl.

scholarly journals Staminate Flower of Cocos Nucifera as Green Inhibitor for Mild Steel in HCl Medium

2012 ◽  
Vol 9 (3) ◽  
pp. 1632-1644 ◽  
Author(s):  
R. Rajalakshmi ◽  
A. S. Safina
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Cocos Nucifera ◽  
Staminate Flower ◽  
Steel Corrosion ◽  
Green Inhibitor ◽  
Flower Extract ◽  
Mild Steel Corrosion ◽  
Hcl Medium ◽  
Mixed Type Inhibitor

Corrosion control methods, especially the use of inhibitors, have gained monumental importance in the present scenario of expunging corrosion and the quest for eco-friendly reasons continues. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulations the present study on the use of Staminate Flower extract of Cocos Nucifera has been carried out by the classical weight loss measurements and electrochemical polarization measurements. The acid extract could bring out a maximum of 97.3% inhibition of mild steel corrosion in 1M HCl. Thermodynamic parameters of the corrosion process were calculated from temperature study. The adsorptive behaviour of Staminate Flower extract in acid solution may be approximated both by Langmuir and Temkin type isotherms. The results obtained by Tafel, Linear polarization resistance, and impedance spectroscopy have been correlated with the classical weight loss measurements. Values of Tafel constant ba and bc confirmed that the Staminate Flower extract acts like mixed type inhibitor. Examination of the surface of the metal in the presence of the inhibitor confirmed the deposition of inhibitor on the metal surface. The Staminate Flower extract in HCl medium efficiently inhibits the corrosion and proved to be zero cost inhibitor, eco-friendly, non-toxic, and highly economical.

Task-specific ionic liquid as a new green inhibitor of mild steel corrosion

2014 ◽  
Vol 289 ◽  
pp. 478-486 ◽  
Author(s):  
E. Kowsari ◽  
M. Payami ◽  
R. Amini ◽  
B. Ramezanzadeh ◽  
M. Javanbakht
Keyword(s):  
Ionic Liquid ◽  
Mild Steel ◽  
Steel Corrosion ◽  
Green Inhibitor ◽  
Mild Steel Corrosion ◽  
Task Specific Ionic Liquid

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.

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