scholarly journals Electrochemical Analysis of the Anti-corrosion Properties of Benzonitrile Compound on Quenched 420 Martensitic Steel in Strong Aqueous Environment

2018 ◽  
Vol 34 (4) ◽  
pp. 1749-1754
Author(s):  
ROLAND TOLULOPE LOTO. ◽  
BRYAN UCHE AYOZIE
Keyword(s):  
Analytical Study ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Martensitic Steel ◽  
Correlation Coefficients ◽  
Electrochemical Analysis ◽  
Aqueous Environment ◽  
Corrosion Properties ◽  
Adsorption Models ◽  
Inhibition Performance

Investigation of the corrosion inhibition properties of benzonitrile compound on the surface degradation of quenched 420 martensitic steel in 6 M H2SO4 was evaluated through the application of potentiodynamic polarization method, micro analytical study and ATR-FTIR spectroscopic analysis. Experimental data showed optimal inhibition performance of the compound with peak inhibition efficiency of 99.4% with mixed type inhibition but dominant anodic inhibition properties. The inhibiting compound significantly influenced the thermodynamic behaviour of the steel resulting in chemisorption adsorption mechanism onto steel surface in consonance with Langmuir and Freundlich adsorption models with correlation coefficients of 1 and 0.7570. The transmittance of identified functional groups of benzonitrile from ATR-FTIR spectroscopy decreased at extended wavelengths due to surface coverage and adsorption of the compound onto the steel.

scholarly journals AERVA LANATA LEAF EXTRACT AS A CORROSION INHIBITOR FOR CARBON STEEL IN CHLORIDE ENVIRONMENT

2018 ◽  
Vol 6 (11) ◽  
pp. 153-162
Author(s):  
Rajesh V. ◽  
E. U. B. Reddi ◽  
T. Byragi Reddy ◽  
Ch. Durga Prasad ◽  
B. Prasanna Kumar
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitor ◽  
Leaf Extract ◽  
Inhibition Efficiency ◽  
Aggressive Medium ◽  
Chloride Ions ◽  
Aqueous Environment ◽  
Aerva Lanata ◽  
Ph Range ◽  
Chloride Environment

The present study was initiated with an objective of investigating a plant extract as an effective corrosion inhibitor useful for protection of carbon steel in aqueous environment containing chloride ions. For this purpose, the leaf extract of the plant ‘Aerva lanata’ belonging to Amaranthaceae family of genus Aerva was chosen. The required optimum concentration of the extract for an effective inhibition was found to be 5 %, resulting in the inhibition efficiency of 95 % against corrosion of carbon steel in 200 ppm of NaCl solution. The extract introduced as a corrosion inhibitor was found to be effective in the pH range from 4.0 to 9.0. The extract could retain its inhibition efficiency for about an immersion period of 60 days and also up to a temperature of 333 K. The 5 % extract was found to control corrosion of carbon steel in highly aggressive medium containing 300 ppm of NaCl also. In order to maintain the protective nature, the required concentration of the extract was 2 %. From these studies, it was inferred that the Aerva lanata leaf extract exhibits good inhibitive properties for carbon steel in aqueous environment in wide ranges of pH, temperature and aggressiveness of medium.

Formation and Mitigation of BaSO4 Scale in Oil Fields

2015 ◽  
Vol 814 ◽  
pp. 278-285
Author(s):  
Ming Zhu ◽  
Cheng Qiang Ren ◽  
Yuan Yuan Meng ◽  
Li Liu ◽  
Yun Ping Zheng
Keyword(s):  
Inhibition Efficiency ◽  
Oil Fields ◽  
Scale Inhibitor ◽  
Conductivity Method ◽  
Environment Friendly ◽  
Scale Inhibition ◽  
Negative Role ◽  
Corrosion Inhibition Efficiency ◽  
Effects Of Temperature ◽  
Inhibition Performance

The deposition of BaSO4scale is always found in the oilfield. It is difficult to be removed. Therefore, it plays a negative role to the production. The effects of temperature and water chemistry on BaSO4scale have been investigated by using the conductivity method in this work. An environment-friendly copolymer was prepared to control the scaling of BaSO4. The copolymer was proved by static scale inhibition method, and weight-loss test that it has excellent scale inhibition performance and corrosion inhibition efficiency. Furthermore, FTIR spectra was used to prove that the scale inhibitor was polyepoxysuccinic acid (PESA).

Modification of Ligustrum vulgare Leaves Extract as Eco-Friendly Corrosion Inhibitors in Oil Fields

2019 ◽  
Vol 814 ◽  
pp. 499-504
Author(s):  
Ren Jun Xu ◽  
Hua Lei He ◽  
Ying Li Tang ◽  
Min Lan Gao ◽  
Hai Peng Hui ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Oil Fields ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Ligustrum Vulgare ◽  
Main Components ◽  
Dark Green

Ligustrum vulgare is an evergreen tree. The leaves are opposite, glossy dark green, 6–17 centimetres (2.4–6.7 in) long and 3–8 centimetres (1.2–3.1 in) broad. The ligustrum vulgare leaves contain two main components, one of which is oleanolic acid and the other is p-hydroxyphenylethanol which indicates its extracts suitable to be used as an effective corrosion inhibitor. Extracts of ligustrum vulgare leaves (PE) were modified with hydroxymethylation reaction (PM1) and Mannich reaction (PM2) to produce the relative stable green acidic corrosion inhibitors. The extracts of ligustrum vulgare leaves have been investigated on the corrosion inhibition of A3 steel with weight loss. The results show that these inhibitors have good corrosion inhibition effect on A3 steel. The PM2 are the most effective for corrosion inhibition, and the inhibition efficiency can reach 75.95%. When the temperature is 60°C, the corrosion inhibition rate of PE, PM1, PM2 is only 24.46%, 42.35% and 39.35% respectively which can not effectively prevent the corrosion of the metal. And the extracts inhibit corrosion mainly by adsorption mechanism. This adsorption accords with Langmuir adsorption isotherm.

QSAR Study of the Adsorption Mechanism of Ascorbic Acid towards Iron in Alkaline Media

2013 ◽  
Vol 652-654 ◽  
pp. 1585-1588
Author(s):  
Hui Wen Tian ◽  
Wei Hua Li ◽  
Bao Rong Hou
Keyword(s):  
Ascorbic Acid ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Quantitative Structure Activity Relationship ◽  
Alkaline Media ◽  
Chemical Adsorption ◽  
Qsar Study ◽  
Structure Activity ◽  
Multivariate Nonlinear Regression ◽  
Corrosion Inhibition Efficiency

A significant correlation was obtained between corrosion inhibition efficiency and the molecular structure of ascorbic acid, using the Quantitative Structure Activity Relationship (QSAR) approach based on a multivariate nonlinear regression technique. It is proposed that inhibitor molecules attach to iron surface by means of chemical adsorption. The considerations leading to this assumption were confirmed by ATR FTIR spectroscopy.

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>

scholarly journals Numerical Computation of the Protection Performance Data of Moringa and Green Tea Extracts on 1070 Alluminum Alloy

2021 ◽  
Vol 1046 ◽  
pp. 151-156
Author(s):  
Roland Tolulope Loto ◽  
Cleophas Akintoye Loto ◽  
Ayorinde Oluseye
Keyword(s):  
Green Tea ◽  
Exposure Time ◽  
Inhibition Efficiency ◽  
Green Tea Extract ◽  
Relevant Variable ◽  
Extract Concentration ◽  
Data Output ◽  
Relevant Variables ◽  
Inhibition Performance ◽  
Tea Extract

Gravimetric and statistical analysis was utilized to assess the inhibition performance of extracts of green tea and moringa on 1070 aluminum in 0.5M H2SO4 solution. Data output showed green tea extract performed more effectively than moringa extract, and at all concentrations studied with optimal inhibition efficiency value of 95.08% compared to moringa which performed effectively at only one concentration with optimal value of 72.38%. Inhibition efficiency values for both extracts varied significantly with reference to exposure time and extract concentration. The optimal mean inhibition value for green tea and moringa extracts are 88.71% and 66.65%. However, the least standard deviation value of 6.22 was obtained for green tea extract with highest inhibition value indication stable inhibition and thermodynamic stability with reference to exposure time. Statistical data showed 90.5% of inhibition output for green tea extract and 9.52% of inhibition output for moringa extract were above 70% inhibition efficiency at margin of error of +12.6. Analysis of variance showed exposure time is the only statistically relevant variable influencing the inhibition output of green tea with statistical value of 78% while exposure time and moringa extract concentration are the both statistically relevant variables influencing the inhibition output of moringa with values of 61.02% and 24.02%.

scholarly journals Synergistic Effect of Trisodium citrate (TSC) on the Inhibition Efficiency of Sargassum swartzii (SS) -Zn2+ System on Mild Steel in Aqueous Environment

2020 ◽  
Vol 13 (4) ◽  
pp. 347-356
Author(s):  
S. Manimegalai
Keyword(s):  
Synergistic Effect ◽  
Mild Steel ◽  
Metal Surface ◽  
Inhibition Efficiency ◽  
Trisodium Citrate ◽  
Aqueous Environment ◽  
Corrosion Monitoring ◽  
Protective Film ◽  
Ft Ir ◽  
Sargassum Swartzii

The aquatic plant kingdom is a treasure of potential bioactive compounds. Aquatic plants contain some organic compounds that provide definite physiological actions on the human body. In the present study deals with the synergistic effect of Trisodium citrate (TSC)on the inhibition efficiency of methanolic extract of Sargassum swartzii (SS) and Zn2+ system on mild steel in aqueous environment. The corrosion monitoring techniques adopted in the study were weight-loss methods, electrochemical measurements, FT-IR and surface morphological techniques namely SEM and EDX. It has proved the formulation consisting of 100 ppm of Zn2+, 120 ppm of SS and 100 ppm of TSC has 95.77% IE. The high performance of SS - Zn 2+- TSC system could be due to synergistic effect that covers a wide surface coverage area on the metal surface and thus retarding the corrosion. Polarization study reveals that this formulation functions as a mixed inhibitor. AC impedance spectra suggest the presence of protective film on the metal surface. FT-IR spectra reveals that the protective film consists of Fe2+-SS complex, Fe2+-TSC complex and Zn (OH)2. SEM and EDX provide a pictorial representation on the nature of surface film in the absence and presence of inhibitors. Thus, it concluded that Sargassum swartzii - Zn 2+- TSC inhibitor system acted as a good inhibitor in aqueous medium.

scholarly journals A Revisit to the Corrosion Inhibition of Aluminum in Aqueous Alkaline Solutions by Water-Soluble Alginates and Pectates as Anionic Polyelectrolyte Inhibitors

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Refat Hassan ◽  
Ishaq Zaafarany ◽  
Adil Gobouri ◽  
Hideo Takagi
Keyword(s):  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Geometrical Structure ◽  
Physical Adsorption ◽  
Water Soluble ◽  
Alkaline Media ◽  
Alkaline Solutions ◽  
Corrosion Mechanism ◽  
Natural Polymer ◽  
Freundlich Isotherms

The corrosion behavior of aluminum (Al) in alkaline media in presence of some natural polymer inhibitors has been reinvestigated. The inhibition action of the tested inhibitors was found to obey both Langmuir and Freundlich isotherms models. The inhibition efficiency was found to increase with increasing the inhibitors concentration and decrease with increasing the temperature, suggesting physical adsorption mechanism. Factors such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and temperature affecting the corrosion rates were examined. The kinetic parameters were evaluated, and a suitable corrosion mechanism consistent with the kinetic results obtained is suggested and discussed.

Research on Corrosion and Scale Inhibition Performance of HEDP

2012 ◽  
Vol 535-537 ◽  
pp. 1180-1184
Author(s):  
Mao Dong Li ◽  
Bin Zeng ◽  
Lin Yang ◽  
Jun Ming Zhao ◽  
Yu Hui Du ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Concentration Ratio ◽  
Inhibition Efficiency ◽  
Total Iron ◽  
Water Medium ◽  
Boiler Water ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Industrial Boiler ◽  
Inhibition Performance

The static scale inhibition method will be used to evaluate the scale inhibition performance of HEDP. In order to study the corrosion inhibition of 20A steel with additive of HEDP in the industrial boiler water medium，the total iron ions in the solution are determined through autoclave static experiments. The results indicated that the scale inhibition efficiency，in the simulation boiler water with a certain concentration ratio and temperature，reached the maximum when CHEDP is 7 mg/L. It has a good corrosion inhibition effect on the 20A steel when the HEDP concentration exceeds 15ppm.

Sign in / Sign up

Export Citation Format

Share Document