scholarly journals Synergistic Combination Effect of Green Organic Derivatives on the Corrosion Inhibition of Mild steel in Simulated Seawater

2018 ◽  
Vol 34 (4) ◽  
pp. 1802-1809 ◽  
Author(s):  
Roland Tolulope Loto. ◽  
Cleophas Akintoye Loto
Keyword(s):  
Mild Steel ◽  
Morphological Analysis ◽  
Open Circuit Potential ◽  
Film Formation ◽  
Open Circuit ◽  
Inhibition Mechanism ◽  
Synergistic Combination ◽  
Simulated Seawater ◽  
Severe Deterioration ◽  
Relative Thermodynamic Stability

Electrochemical studies of the synergistic combination of green organic derivatives, leucine and vanillin and the corrosion protection of mild steel in simulated seawater (3.5 wt.% NaCl) was done using potentiodynamic polarization, open circuit potential and morphological analysis. Results showed the combined admixture performed effectively with highest inhibition value of 89% at 3% volumetric content of the admixture. The performance of the compound was observed to be proportional to concentration with mixed type inhibition characteristics. Significant anodic shift of corrosion potential occurred due to film formation compared to the control solution at relative thermodynamic stability. The inhibition mechanism of the admixture occurred through physisorption reaction from thermodynamic calculations according to Langmuir, Frumkin and Freudlich isotherms with correlation coefficient above 0.7. Severe deterioration was observed on the morphology of mild steel with inhibitor compared to the steel from solution at highest inhibitor concentration.

scholarly journals SYNTHESIS AND EVALUATION OF ETHYL (4-(N-(THIAZOL-2-YL) SULFAMOYL) PHENYL)CARBAMATE (TSPC) AS A CORROSION INHIBITOR FOR MILD STEEL IN 0.1M HCL

2016 ◽  
Vol 11 (2) ◽  
pp. 3441-3451 ◽  
Author(s):  
A. M. El-Shamy ◽  
M. F. Shehata ◽  
Samir T. Gaballah ◽  
Eman A. Elhefny
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Room Temperature ◽  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Free Energy Of Adsorption ◽  
Langmuir Adsorption ◽  
Gibb’S Free Energy

Laboratory synthesized ethyl (4-(N-(thiazol-2-yl)sulfamoyl)phenyl)carbamate (TSPC), characterized by 1H NMR spectroscopy, was evaluated as corrosion inhibitor of mild steel in 0.1M HCl using electrochemical techniques. Open circuit potential, potentiodynamic polarization and impedance spectroscopy were used to evaluate the inhibition efficiency of (TSPC) at various concentrations. The obtained electrochemical data indicated that (TSPC) acts as moderate corrosion inhibitor for mild steel in acidic media. It is found that the inhibition efficiency increases with the concentration of the inhibitor till 400ppm. The adsorption isotherm involving physisorption of (TSPC) at room temperature and the experimental data complied to the Langmuir adsorption isotherms and the negative values of the Gibb’s free energy of adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface.

Effects of Pb on SCC of Alloy 600 and Alloy 690 in Prototypical Steam Generator Chemistries

2005 ◽  
Vol 475-479 ◽  
pp. 1387-1392 ◽  
Author(s):  
Jesse Lumsden ◽  
Allan McIlree ◽  
Richard Eaker ◽  
Rocky Thompson ◽  
Steve Slosnerick
Keyword(s):  
Steam Generator ◽  
Open Circuit Potential ◽  
Film Formation ◽  
Open Circuit ◽  
Alloy 600 ◽  
Steam Generators ◽  
Film Rupture ◽  
Test Environment ◽  
Alloy 690 ◽  
Thermally Treated

Intergranular attack/stress corrosion cracking of Alloy 600 continues to be an issue in the tube/tube support plate crevices and top of tubesheet locations of recirculating steam generators and in the upper bundle of free span superheated regions of once through steam generators (OTSG). Recent examinations of degraded pulled tubes from several plants suggest possible lead involvement in the degradation. Laboratory investigations have been performed to determine the factors influencing lead cracking in Alloy 600 and Alloy 690 steam generator tubes. The test environment is believed to be prototypical, with the addition of lead oxide, of a concentrated liquid phase existing in the pores of thin deposits on upper bundle tubes of an OTSG. Highly strained reverse U-bend specimens were tested at controlled electrochemical potentials. Maximum susceptibility was at open circuit potential, unlike cracking of Alloy 600 in caustic and acid sulfate environments where maximum susceptibility occurs when specimens are polarized above the open circuit potential. Transgranular, intergranular and mixed mode cracking was observed and in all Alloy 600 conditions tested (mill annealed, sensitized, thermally treated) while thermally treated Alloy 690 has so far resisted cracking. A film rupture/anodic dissolution model with displacement plating of Pb preceding passive film formation is consistent with the experimental observations

scholarly journals Effect of Sodium Tungstate as a Green Corrosion Inhibitor on the Passivation Behavior of Mild Steel Sheet in Aggressive Media

2016 ◽  
Vol 4 (2) ◽  
pp. 183-190 ◽  
Author(s):  
Deepak V.K. ◽  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Steel Sheet ◽  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Sodium Tungstate ◽  
Open Circuit ◽  
Green Corrosion Inhibitor ◽  
Naoh Solution ◽  
Corrosion Inhibition Efficiency

The effect of sodium tungstate on the passivation behavior of grille sheet made by mild steel was studied using corrosion tests and electrochemical measurements in 1 M HCl, 0.5 M NaCl and 1 M NaOH solutions, open to air at 25 °C. The grille sheet showed the highest corrosion resistance properties in 1 M NaOH solution as compared with 1 M HCl and 0.5 M NaCl solutions. The corrosion resistance properties of the steel sheet was decreased with increasing the concentration of sodium tungstate up to 800 ppm and its corrosion inhibition efficiency was increased with increasing the concentration. The open circuit potential of the mild steel sheet was more negative value in 0.5 M NaCl than that in 1 M HCl, whereas more positive potential value was observed in 1 M NaOH than in 0.5 M NaCl solution. It was found that the mild steel sheet used in the study was found to be more passive in 1 M NaOH than in 1 M HCl and 0.5 M NaCl solutions. Hence, a more stable anodic passive film was formed on the surface of the steel sheet in 1 M NaOH than those in 1 M HCl and 0.5 M NaCl solutions from electrochemical measurements.Int J Appl Sci Biotechnol, Vol 4(2): 183-190  

scholarly journals Electrochemical behavior of tantalum in potassium hydroxide solutions

2018 ◽  
Author(s):  
Irena Ljubomir Mickova
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Behavior ◽  
Potassium Hydroxide ◽  
Open Circuit Potential ◽  
Cathodic Polarization ◽  
Film Formation ◽  
Open Circuit ◽  
Passive Region ◽  
M 10 ◽  
Stable Passive

<p class="PaperAbstractTitle"><em>The electrochemical behavior of tantalum in various concentrations of KOH solutions <br /> (0.1 M - 10 M), was investigated using the evolution of the open circuit potential in time, cyclic voltammetry and ellipsometric measurements. Depending on KOH concentrations, the open circuit potential measurements have shown three distinct behaviors concerning oxide film formation on the electrode surface and its dissolution. The cyclic voltammetry measurements were performed in various potential ranges, from -1.4 to 8 V, different concentrations of KOH solutions (0.1-10 M) and sweep rates ranging from 0.005 V/s to 1 V/s. In the passive region, very stable passive films were formed, which reduction has not been possible during cathodic polarization even at highly concentrated KOH solutions. In the trans-passive region, the very strong peak at 1.65 V was monitored, which nature and chemical composition is still not well known. </em></p>

scholarly journals Study of Jatropha Curcas Extract as a Corrosion Inhibitor in Acidic Medium on Mild Steel by Weight Loss and Potentiodynamic Methods

2020 ◽  
Vol 41 (1) ◽  
pp. 87-93
Author(s):  
Dipak Kumar Gupta ◽  
KM Anita Kafle ◽  
Anju Kumari Das ◽  
Shova Neupane ◽  
Anita Ghimire ◽  
...  
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Jatropha Curcas ◽  
Acidic Medium ◽  
Open Circuit Potential ◽  
Inhibition Efficiency ◽  
Open Circuit ◽  
Mixed Type Inhibitor

The corrosion inhibition properties of methanol extract of Jatropha curcas (JC) were investigated for mild steel (MS) in acidic medium using weight loss and potentiodynamic methods. Corrosion inhibition of MS in 1MH2SO4 was studied in the absence and presence of various concentrations of the methanolic extract of Jatropha curcas barks. The results showed an increase in corrosion inhibition with increasing concentration of the extract. The inhibition efficiency of 1000 ppm JC extract from the weight loss and potentiodynamic polarization methods were approximately 92.0% after 24 hours immersion in the acidic solution. Open circuit potential (OCP) and potentiodynamic polarization measurements showed that the JC extract acts as a mixed-type inhibitor.

Electrochemical Behavior of Alloy 825 at High-Temperature Pressurized Water–Chloride Solutions (30°C to 280°C)

CORROSION ◽  
10.5006/2817 ◽  
2018 ◽  
Vol 74 (11) ◽  
pp. 1245-1258 ◽  
Author(s):  
Lefu Zhang ◽  
Jiamei Wang ◽  
Farzin Arjmand
Keyword(s):  
High Temperature ◽  
Open Circuit Potential ◽  
Film Formation ◽  
Open Circuit ◽  
Experimental Conditions ◽  
Pressurized Water ◽  
Series Of Experiments ◽  
Do Concentration ◽  
Effects Of Temperature ◽  
Microscopic Surface

Variations in the transpassive potential (Et) and open circuit potential (OCP) of Alloy 825 were investigated at high-temperature pressurized water–Cl solutions. Using an experimental design strategy, the effects of temperature (T) (30°C to 280°C), Cl− concentration (10 ppb to 1,000 ppb), and dissolved oxygen (DO) concentration (0 ppb to 200 ppb) on the electrochemical responses (Et and OCP) of the alloy were analyzed by conducting only a short series of experiments. The optimum values of each factor was obtained from the designed matrix of the experiments and the constructed 3D response surface plots based on the most positive values of the Et and OCP. The optimum experimental conditions in which the most positive Et can be recorded was found as follows: T ≈ 30°C (significant), [Cl−] ≈ 10 ppb (significant), and [DO] ≈ 200 ppb (less significant). The most positive OCP values were recorded when the analyzed factors were as follows: T ≈ 120°C (significant), [DO] ≈ 200 ppb, and [Cl−] ≈ 10 ppb (less significant). Finally, the microscopic surface analysis of the alloy coupons revealed the great impact of temperature on the oxide film formation on Alloy 825.

Corrosion Performance of Mild Steel in Paper Mill Effluent

2012 ◽  
Vol 585 ◽  
pp. 522-527 ◽  
Author(s):  
Chhotu Ram ◽  
Chaya Sharma ◽  
Ajay Kumar Singh
Keyword(s):  
Mild Steel ◽  
Open Circuit Potential ◽  
Corrosion Behaviour ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Chloride Content ◽  
Paper Mill ◽  
Open Circuit ◽  
Localized Corrosion ◽  
Paper Mill Effluent

Present paper reports investigations carried on corrosion behaviour of mild steel in effluents collected from paper mill treatment plant. For this purpose, effluent was collected from after primary and secondary treatment stages. Mild steel samples were exposed to these effluents for duration of six months. The corroded samples were analysed for weight loss and extent of localised corrosion. Electrochemical polarization tests like open circuit potential (OCP), tafel plot and anodic polarization were also performed to estimate corrosion rate, polarization resistance and localized corrosion parameters in the studied system. The extent of corrosion attack has been correlated with effluent parameters namely pH, electrical conductivity (Ec), total suspended solids, total dissolved solids, chemical oxygen demand, biochemical oxygen demand, chloride content, colour and sulphate.

Morphology, Structure and Corrosion Resistance of Nano-Enamel Coating Changed on Ti-6Al-4V Alloy

2017 ◽  
Vol 893 ◽  
pp. 309-312
Author(s):  
Yu Lin Li ◽  
Zhe Rui Huang ◽  
Qing Dong Zhong ◽  
Chen Xiao ◽  
Hui Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Mild Steel ◽  
Potentiodynamic Polarization ◽  
Enamel Coating ◽  
Open Circuit Potential ◽  
Sol Gel ◽  
Open Circuit ◽  
X Ray Diffraction ◽  
X Ray

Using a sol-gel method and impregnation technology to produce nanoenamel coating on polished Ti-6Al-4V alloy. The morphology, structure and phase composition of nanoenamel coatings modified on mild steel were identified with X-ray diffraction (XRD), scanning electro microscopy (SEM) and tested by some electrochemical methods, such as open circuit potential and potentiodynamic polarization testing [1]. All of these method can select the samples which perform the best corrosion resisitance.

scholarly journals Effect of 1-Acetyl-1H-Benzotriazole on Corrosion of Mild Steel in 1M HCl

2021 ◽  
Vol 13 (3) ◽  
pp. 979-988
Author(s):  
P. P. Kamble ◽  
R. S. Dubey
Keyword(s):  
Mild Steel ◽  
Mixed Type ◽  
Steel Surface ◽  
Open Circuit Potential ◽  
Steel Corrosion ◽  
Open Circuit ◽  
Inhibition Study ◽  
X Ray ◽  
Mild Steel Corrosion ◽  
Hcl Solution

The corrosion inhibition study of  1-acetyl-1H-benzotriazole (ABTZ) on mild steel in 1M HCl solution has been investigated using different techniques like weight loss, open circuit potential (OCP), and potentiodynamic polarization. Results showed that ABTZ inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiencies increased with the increase in inhibitor concentration. The polarization curves revealed that the studied compound behaved as a mixed-type of inhibitor. The adsorption of the inhibitor on the surface of mild steel in the corrosive environment followed the Langmuir isotherm. The presence of thin film formed due to adsorption of ABTZ on mild steel surface is further confirmed by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX).

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