scholarly journals Bee Wax Propolis Extract as Eco-Friendly Corrosion Inhibitors for 304SS in Sulfuric Acid

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Femiana Gapsari ◽  
Rudy Soenoko ◽  
Agus Suprapto ◽  
Wahyono Suprapto
Keyword(s):  
Sulfuric Acid ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Protective Layer ◽  
Inhibition Mechanism ◽  
Main Compound ◽  
Propolis Extract ◽  
Isotherm Equation ◽  
Increasing Temperature ◽  
Temkin Adsorption Isotherm

The inhibition properties of bee wax propolis (BWP) extract on the 304SS in 0.5 M sulfuric acid were conducted using potentiodynamic polarization, EIS, and XRD. Quercetin (2-(3.4-dihydroxy phenyl)-3.5.7-trihydroxy-4H-chromen-4-one) was identified as the main compound in the BWP extract based on FTIR and HPLC analysis. The results showed that the inhibitor could retard the corrosion rate of 304SS in 0.5 M sulfuric acid which reached 97.29% and 91.42% at 2000 ppm based on potentiodynamic polarization and EIS measurement, respectively. The inhibition efficiency decreased with increasing temperature. The inhibition mechanism of BWP extract on the 304SS was physisorption and obeyed Temkin adsorption isotherm equation. The thin protective layer on the 304SS surface was confirmed by XRD.

scholarly journals Tin corrosion inhibition by molybdate ions in 0.2 M maleic acid solution: Electrochemical and surface analytical study

2020 ◽  
Vol 10 (5) ◽  
pp. 465
Author(s):  
Brahim Ait Addi ◽  
Abdelaziz Ait Addi ◽  
Abdul Shaban ◽  
El Habib Ait Addi ◽  
Mohamed Hamdani
Keyword(s):  
Acid Solution ◽  
Analytical Study ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Protective Layer ◽  
Inhibition Mechanism ◽  
Electrochemical Polarization ◽  
Impedance Measurements ◽  
Passive Transition ◽  
Increasing Temperature

<p>The inhibition efficiency of molybdate ions (MoO<sub>4</sub><sup>2-</sup>) against tin corrosion in 0.2 M Malic acid has been studied using electrochemical (DC and AC) and surface analytical methods (SEM and EDX). The electrochemical polarization curves revealed the presence of an active/passive transition of the tin electrode. The electrochemical impedance measurements (EIS) confirmed the benefic effect of increasing MoO<sub>4</sub><sup>2-</sup> concentration on the inhibition efficiency (η %) (reaching η<sub>max </sub>≈ 88% at 0.02 M), whereas η % decreases by increasing temperature. The molybdate ions inhibition mechanism was attributed to the adsorption on the metal surface involving the formation of the adsorbed protective layer.<strong></strong></p>

Corrosion inhibition action of Landolphia heudelotii on mild steel in acidic media

2020 ◽  
Vol 49 (5) ◽  
pp. 387-392
Author(s):  
Chinyere Elizabeth Agiriga ◽  
Emeka Oguzie ◽  
Arinzechukwu Chidiebere ◽  
Nnaemeka John Okorocha ◽  
Reginald Ndubuisi Chikwe
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Elevated Temperatures ◽  
Construction Materials ◽  
Water Extract ◽  
Inhibition Mechanism ◽  
Acidic Media ◽  
Content Type

Purpose This paper aims to investigate the corrosion inhibition efficiency of Landolphia heudelotii (LH) on mild steel in 1 M HCl and 0.5 M H2SO4 using weight loss and potentiodynamic polarization techniques. Design/methodology/approach Water extract of LH was used as corrosion inhibitor on mild steel in acidic media at room temperature and elevated temperatures (30-60°C). Various concentrations of the plant extract were prepared from the stock solution obtained after solvent extraction. The inhibition efficiency of LH extract was evaluated and mechanism of adsorption was deduced. Findings LH extract showed significant corrosion inhibition on mild steel in both acidic media, with inhibition efficiency increasing with extract concentration. Potentiodynamic polarization measurements revealed mixed inhibition mechanism. Optimum inhibition efficiency was recorded at 2500 mg/L after 288 h. Mechanism of adsorption was mainly of physisorption. The inhibitor exhibited good inhibition efficiency even at elevated temperature. Research limitations/implications This study provides new data on the anticorrosion characteristics of LH extract under the specified conditions. Further studies could expand the experimental variables and use advanced surface probe techniques. Practical implications The developed inhibitor provides an alternative method of inhibiting corrosion on mild steel using eco-friendly materials from natural products which are less toxic, safer, cost-effective and readily available. Originality/value The method used was effective and the inhibitor developed can be incorporated in surface coatings where mild steel is used as construction materials, as tube sheets, rods and bars.

scholarly journals Adsorption and thermodynamics properties of acacia tortilis as corrosion inhibitor of aluminum metal matrix composites in acidic medium

10.30544/281 ◽  
2017 ◽  
Vol 23 (2) ◽  
pp. 153-166 ◽  
Author(s):  
Suleiman Idawu Yakubu ◽  
Rufai Ochu Suleiman ◽  
Rasheed Agava ◽  
Ogheneme Clifford ◽  
Emokpaire Steven
Keyword(s):  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Standard Free Energy ◽  
Inhibition Mechanism ◽  
Aluminum Matrix Composites ◽  
Standard Entropy ◽  
Matrix Composites ◽  
Acacia Tortilis ◽  
Composite Surface

Acacia tortilis (AT) was extracted and characterized by gas chromatography-mass spectrometry (GC-MS). The eco-friendly corrosion inhibitor for aluminum matrix composites was investigated in 1.0 M HCl at 30-60 °C. The concentration of the inhibitor and time were varied in the range of 0 – 10 % v/v and 24-144 h. The inhibition studies were carried out using gravimetric method and potentiodynamic polarization. The surface morphology of the coupons was characterized by SEM/EDS techniques. The GC-MS revealed some elements/compounds (NCS, C-H, N or O). The inhibition efficiency increased with concentration and decreased with increase in temperature. The optimum inhibition efficiency of 89.60% was obtained at concentration of 8% v/v at 30 °C. Potentiodynamic polarization confirmed that the inhibitor acts as mixed types inhibitor. Activation energy (Ea) with inhibitor was higher than without inhibitor and proved to be physisorption. The thermodynamic parameters (standard free energy ΔG°), standard enthalpy (ΔHads) and standard entropy (ΔS) of the adsorption process were calculated. The inhibition mechanism of AT extract on Al-Si-Fe/15%SiC was physical and obeyed Langmuir adsorption isotherm. The protective layer on the composite surface confirmed the potential of the extract as corrosion inhibitor. The results of weight loss were in good agreement with those of electrochemical technique.

scholarly journals Inhibition Effect of Hydrazine-Derived Coumarin on a Mild Steel Surface in Hydrochloric acid

2020 ◽  
Vol 37 (3−4) ◽  
Author(s):  
Fanar G. Hashim ◽  
Taghried A. Salman ◽  
Shaimaa B. Al-Baghdadi ◽  
Tayser Gaaz ◽  
Ahmed Al-Amiery
Keyword(s):  
Hydrochloric Acid ◽  
Mild Steel ◽  
Density Functional ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Protective Layer ◽  
Sem Analysis ◽  
Mild Steel Surface ◽  
Acid Environment ◽  
Increasing Temperature

In this work, economy novel hydrazine-derived coumarin 4-(6-methylcoumarin)acetohydrazide (MCA) were synthesized, characterized, and tested as an inhibitor for the corrosion of a surface of mild steel in an acidic environment through weight loss and Scanning electron microscopy (SEM) techniques. Results showed that the synthesized inhibitor can inhibit the corrosion of mild steel surface in a 1 M hydrochloric acid environment. The corrosion inhibition efficiency of MCA increases with increasing MCA concentration and decreases with increasing temperature. SEM analysis showed the formation of a film as a protective layer from MCA molecules on the surface of mild steel. Adsorption of the MCA molecules on the mild steel surface in the presence of hydrochloric acid environment was obeyed Langmuir isotherm. The density functional theory (DFT) calculations were used to study the relationship between molecular structure and inhibition efficiency and they found in good agreement.

Electrochemical evaluation of cr-mn austenitic stainless steel in aqueous sulphuric acid and influence of thiocyanate ions

2020 ◽  
Vol 67 (3) ◽  
pp. 281-293 ◽  
Author(s):  
Ankur V. Bansod ◽  
Awanikumar P. Patil ◽  
Sourabh Shukla
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Acid Solution ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Steel Surface ◽  
Content Type ◽  
Polarization Test ◽  
Increasing Temperature

Purpose Low nickel austenitic stainless steel (ASS) has attracted much attention worldwide because of its economical price. This study aims to investigate the effect of different corrosive environments on the corrosion behavior of chrome-manganese (Cr-Mn) ASS. The tests were carried out as a function of H2SO4 concentrations, temperature and addition of ammonium thiocyanate (NH4SCN) (0.01 M). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used to study the corrosion behavior of Cr-Mn ASS. It was observed that with increasing H2SO4 concentration, temperature and with the addition of NH4SCN solution, icorr, icrit and ipassive values increased. EIS data show decreasing charge transfer resistance value with increasing concentration and temperature. Higher corrosion rate with increasing temperature and concentration of H2SO4 is related to the anions (SO42−), which is responsible for reducing the stability of passive films. With the presence of 0.01 M NH4SCN thiocyanate (SCN− anion), there is a higher dilution of the passive film resulting in a higher corrosion rate. Energy-dispersive spectroscopy (EDS) analysis reveals the adsorption of sulfur on the surface in NH4SCN containing a solution. The significant presence of counter ions and the adsorbed sulfur species on the steel surface play a vital role in corrosion behavior. Design/methodology/approach All the experiments were performed on a 3 mm thick sheet of Cr-Mn ASS (202 ASS) in hot rolled condition. The samples were then annealed at 1,050°C for 1 h, followed by water quenching. For microstructural examination, they were electrochemically etched in 10 Wt.% oxalic acid solution at 1 amp for 90 s. A computer-controlled Potentiostat (Biologic VMP-300) was used. After the cell was set up, the working electrode (WE) was electrostatically cleaned at −1 V vs saturated calomel electrode (SCE) for 30 s to remove the air-formed film. Then, WE were allowed to attain stable open circuit potential (OCP) for 1 h, following by the EIS test and potentiodynamic polarization test. The polarization test was started from a cathodic potential (−1.2 V vs SCE) and continued up to an anodic potential (1.6 V vs SCE) a scan rate of 0.1667 mV/s. EIS experiment was conducted on the same instrument by using a sinusoidal AC signal of 10 mV in a frequency range of 1,000,000 to 0.01 Hz at OCP. Findings Potentiodynamic polarization graph shows that with the increase in sulphuric acid concentration. Increasing temperature from 20°C to 80°C in 0.5 M H2SO4 solution increases the corrosion rate (icorr) of Cr-Mn ASS. On the addition of 0.01 M NH4SCN to the sulfuric acid solution (0.1, 0.5 and 1 M) the corrosion rate increases drastically almost four to five times. EDS and XRD analysis shows the presence of sulfur over the oxide film and preferential site for dissolution of Cr and Mn at the steel surface when NH4SCN is added to the sulfuric acid solution. Originality/value A study on the corrosion behavior of Cr-Mn ASS is scanty according to the author’s knowledge. Therefore, the present study will investigate the corrosion behavior of Cr-Mn ASS on SO4−2 anions, temperature and the addition of SCN− ion in sulfuric acid.

scholarly journals Experimental, DFT and MD Assessments of Bark Extract of Tamarix aphylla as Corrosion Inhibitor for Carbon Steel Used in Desalination Plants

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3679
Author(s):  
Ismat H. Ali
Keyword(s):  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Effect Of Temperature ◽  
Bark Extract ◽  
Plant Sample ◽  
Gravimetric Analysis ◽  
Sample Collection ◽  
Eis Measurements

This study aimed to examine the extract of barks of Tamarix aphylla as a corrosion inhibitor. The methodology briefly includes plant sample collection, extraction of the corrosion inhibitor, gravimetric analysis, plotting potentiodynamic polarization plots, electrochemical impedance spectroscopic measurements, optimization of conditions, and preparation of the inhibitor products. The results show that the values of inhibition efficiency (IE%) increased as the concentrations of the inhibitor increased, with a maximum achievable inhibition efficiency of 85.0%. Potentiodynamic polarization (PP) tests revealed that the extract acts as a dual-type inhibitor. The results obtained from electrochemical impedance spectroscopy (EIS) measurements indicate an increase in polarisation resistance, confirming the inhibitive capacity of the tested inhibitor. The adsorption of the inhibitor on the steel surface follows the Langmuir adsorption isotherm model and involves competitive physio-sorption and chemisorption mechanisms. The EIS technique was utilized to investigate the effect of temperature on corrosion inhibition within the 298–328 K temperature range. Results confirm that the inhibition efficiency (IE%) of the inhibitor decreased slightly as the temperature increased. Lastly, the thermodynamic parameters for the inhibitor were calculated.

scholarly journals Chemical, electrochemical, thermodynamic and adsorption study of EN8 dual-phase steel with ferrite-martensite structure in 0.5 M H2SO4 using pectin as inhibitor

2021 ◽  
Author(s):  
P. R. Prabhu ◽  
Pavan Hiremath ◽  
Deepa Prabhu ◽  
M. C. Gowrishankar ◽  
B. M. Gurumurthy
Keyword(s):  
Weight Loss ◽  
Adsorption Isotherm ◽  
Surface Analysis ◽  
Potentiodynamic Polarization ◽  
Dual Phase Steel ◽  
Inhibition Efficiency ◽  
Dual Phase ◽  
X Ray ◽  
Enthalpy And Entropy ◽  
Martensite Structure

AbstractThis paper presents the corrosion and inhibition behavior of heat-treated EN8 dual-phase steel with ferrite-martensite structure with pectin in 0.5 M sulphuric acid. The corrosion studies were performed using the weight loss method, electrochemical techniques such as potentiodynamic polarization measurements, and impedance spectroscopy. The study was done at different concentrations of pectin in the temperature range of 40 to 70 °C and immersion time of 1, 3, 5, and 7 h. The results showed that the inhibition performance of pectin has enhanced with an increase in pectin concentration and decreased with the temperature and time of exposure. From the weight loss study, highest inhibition efficiency of 76.43% was achieved at 5.0 g/L at 1 h of exposure at 40 °C. The maximum inhibition efficiency of 62% was obtained with 5.0 g/L of pectin at 40 °C by potentiodynamic polarization method. The energy, enthalpy, and entropy of activation and also thermodynamic parameters like free energy, enthalpy, and entropy of adsorption were assessed and discussed. Appropriate adsorption isotherm was fit to the obtained experimental outcomes and achieved Langmuir adsorption isotherm to be the best fit and obeyed physical adsorption. Surface analysis: scanning electron microscopy, X-ray diffraction techniques, atomic force microscopy, and energy dispersive X-ray were done with and without the addition of pectin. The metal surface appears to be uniform and smooth in the presence of pectin and adsorption was confirmed by surface analysis.

scholarly journals Protection of Aluminum Foils against Environmental Corrosion with Graphene-Based Coatings

2021 ◽  
Vol 8 ◽  
pp. 18-28
Author(s):  
George Paterakis ◽  
George Anagnostopoulos ◽  
Labrini Sygellou ◽  
Costas Galiotis ◽  
◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sulfuric Acid ◽  
Inhibition Efficiency ◽  
Lithium Perchlorate ◽  
Aluminum Foil ◽  
Corrosion Performance ◽  
Acidic Conditions ◽  
Corrosion Inhibition Efficiency ◽  
Commercial Applications ◽  
Lower Corrosion Rate

Commercial aluminum foils were coated by graphene oxide, and its functionalized derivatives and the corrosion performance of the coated specimens were examined in acidic conditions (lithium perchlorate and sulfuric acid). Electrochemical experiments have shown that all graphene oxide-coated specimens provided up to 96% corrosion inhibition efficiency with a corresponding lower corrosion rate compared to the bare aluminum foil. Our results clearly show that graphene-related materials offer viable alternatives for the protection of aluminum, and this opens up a number of possibilities for its use in a number of commercial applications.

scholarly journals Protection of Mild Steel Corrosion in Sulphuric Acid Environment Using Wheat Starch

2017 ◽  
Vol 10 ◽  
pp. 11-21 ◽  
Author(s):  
Simeon C. Nwanonenyi ◽  
Okoro Ogbobe ◽  
Emeka Emmanuel Oguzie
Keyword(s):  
Mild Steel ◽  
Metal Surface ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Measurement Techniques ◽  
Steel Corrosion ◽  
Polarization Measurement ◽  
Wheat Starch ◽  
Adsorption Parameters ◽  
Acid Environment

The corrosion of mild steel in 0.5 M H2SO4acid solution and the inhibition process by wheat starch (WS) was investigated using weight loss and potentiodynamic polarization measurement techniques respectively. Gravimetric results revealed that there is significant reduction in the corrosion rate of mild steel in the presence of inhibited solution compared to blank solution, and also the inhibition efficiency was found to depend on the concentration of the WS. Data on potentiodynamic polarization results confirmed that WS exhibited mixed type inhibition behaviour, though the cathodic effect was more pronounced. The mode of WS adsorption on the corroding metal surface followed Langmuir isotherm model. In addition, the trend of inhibition efficiency with temperature, activation energy and heat of adsorption parameters revealed a strong interaction between the WS constituents and the corroding metal surface, thus indicating that WS lowered the corrosion process by blanketing the mild steel surface through chemical adsorption mechanism. The mechanism of inhibition was discussed in the light of the chemical structure of starch.

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