scholarly journals Propargyl as Corrosion Inhibitor for Al-5%Si/15%SiC Composite in 0.5molar Sodium Hydroxide

2016 ◽  
Vol 11 (2) ◽  
pp. 141 ◽  
Author(s):  
F. Asuke ◽  
S.A. Yaro ◽  
O.B. Oloche
Keyword(s):  
Sodium Hydroxide ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Sodium Hydroxide Solution ◽  
Inhibitor Concentration ◽  
Corrosion Characteristic ◽  
Adsorption Free Energy ◽  
Mechanism Of Inhibition ◽  
Maximum Inhibition

The corrosion characteristic of Al-5%Si/15%SiC composite in 0.5molar sodium hydroxide solution (cauustic soda) using propargyl as corrosion inhibitors was investigated employing gravimetric and potential measurements. The research was carried out at different inhibitor concentrations, time and temperature rangges of 0.5 – 2.5% v/v, 1– 5 hours and 30 – 70 °C respectively. Results obtained revealed that propargyl is a moderate corrosion inhibitor for the composite, with maximum inhibition efficiency of 59.23% at 30 °C and inhibitor concentration of 1.5% v/v. Thermodynamic parameters such as heat of adsorption, free energy and activation energy were obtained from experimental data and the mechanism of inhibition was elucidated. The inhibitor is physically and chemically absorbed unto the surface of the composite.

scholarly journals Newly Synthesized N-Substituted Thiosemicarbazone as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl

2019 ◽  
Vol 7 (4.14) ◽  
pp. 168
Author(s):  
N Z. Nor Hashim ◽  
K Kassim ◽  
F H. Zaidon
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Langmuir Adsorption ◽  
Before And After ◽  
Ft Ir ◽  
L1 And L2

Two N-substituted thiosemicarbazone derivatives namely as 2-(4-chlorobenzylidene)-N-phenylhydrazinecarbothioamide and 2-benzylidene-N-phenylhydrazinecarbothioamide (L1 and L2, respectively) have been tested as corrosion inhibitors on mild steel in 1 M HCl. The ligands were synthesized and investigated using potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS).  The obtained results indicated that inhibition efficiency, (IE, %) L1 increased with increasing inhibitor concentrations which behaved as a good corrosion inhibitor compared to L2. The synthesized ligands were successfully characterized by melting point, elemental analysis (C, H, N, and S), Fourier-transform infrared spectroscopy (FT-IR) and NMR (1H and 13C) spectroscopy. The excellent inhibition effectiveness for both compounds on mild steel before and after immersion in 1 M HCl solution containing 40 ppm of L1 and L2 were also verified by scanning electron microscope (SEM). Based on potentiodynamic polarization results, it can be concluded that all investigated compounds are mixed-type inhibitors and obey the Langmuir adsorption isotherm. 

scholarly journals Ethanolamines as Corrosion Inhibitors for Zinc in (HNO3+H2SO4) Binary Acid Mixture

2010 ◽  
Vol 7 (2) ◽  
pp. 665-668 ◽  
Author(s):  
R. T. Vashi ◽  
H. M. Bhajiwala ◽  
S. A. Desai
Keyword(s):  
Corrosion Rate ◽  
Acid Concentration ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Corrosion Behaviour ◽  
Acid Mixture ◽  
Inhibitor Concentration

This work deals with the study of corrosion behaviour for zinc in (HNO3+ H2SO4) binary acid mixture containing ethanolamines. Corrosion rate increases with concentration of acid and temperature. At constant acid concentration, the inhibition efficiency of ethanolamines increases with the inhibitor concentration. Value of ΔGa increases and inhibition decreases with temperature. The mode of inhibition action appears to be chemisorption.

scholarly journals Ibuprofen as a corrosion inhibitor for copper in synthetic acid rain solution

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zaklina Z. Tasić ◽  
Marija B. Petrović Mihajlović ◽  
Ana T. Simonović ◽  
Milan B. Radovanović ◽  
Milan M. Antonijević
Keyword(s):  
Acid Rain ◽  
Corrosion Inhibitor ◽  
Quantum Chemical ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Theoretical Calculations ◽  
Pharmaceutical Compounds ◽  
Copper Corrosion ◽  
A Value ◽  
Synthetic Acid

Abstract It is known that if unused drugs are improperly disposed, they can pollute the environment. Furthermore, researchers are still trying to find an environmentally friendly corrosion inhibitor. These factors lead to the possible application of unused pharmaceutical compounds as corrosion inhibitors. The feasibility of an anti-inflammatory, analgesic and antipyretic drug, ibuprofen, was evaluated as a potential copper corrosion inhibitor in synthetic acid rain solution. This investigation was performed by applying electrochemical and weight loss measurements and quantum chemical calculations. The results obtained by these techniques revealed the ability of ibuprofen to protect copper from corrosion. The inhibition efficiency of ibuprofen rises with increase in its concentration and can reach a value of 97.3%. The results of surface analysis of treated coupons by scanning electron microscopy and theoretical calculations are consistent with the experimental results.

Experimental Investigation of a New Derived Oleochemical Corrosion Inhibitor

2019 ◽  
Vol 796 ◽  
pp. 112-120
Author(s):  
Mysara Eissa Mohyaldinn ◽  
Wai Lin ◽  
Ola Gawi ◽  
Mokhtar Che Ismail ◽  
Quosay A. Ahmed ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Dynamic Condition ◽  
Methyl Esters ◽  
Static Condition ◽  
Chemical Corrosion ◽  
Boron Fluoride

Most of the corrosion inhibitors that are used in industry contain chemicals that are harmful to health and environment. Corrosion inhibitors derived from green sources are, therefore, believed to be a good option for replacing the chemical corrosion inhibitors. In this work, a green oleochemical corrosion inhibitor derived from Jatropha Curcas is introduced. The paper discusses the methodology of deriving the corrosion inhibitor as well as the experimental test conducted for evaluating its corrosion inhibition efficiency. The new oleochemical corrosion inhibitor was derived via two reactions. Jatropha oil was firstly saponified with sodium hydroxide to yield gras acid and glycerol, which was then esterified with boron fluoride in presence of excess methanol to produce the oil methyl esters, which is used as oleo-chemical corrosion inhibitor. To evaluate the oleo-chemical corrosion inhibitor, the corrosion rate of mild steel in NaCl corrosive medium with CO2 is tested at static condition and two dynamic conditions, namely 500 and 1500 rpm. This is to simulate the transitional and turbulent flow in a pipeline. At each dynamic condition, the proposed corrosion inhibitor was tested at concentration dosages of 0, 50, 100, and 150 ppm. The experiments results revealed a good performance of the new oleochemical corrosion inhibitor. The inhibition efficiency was found to be highly affected by the concentration of corrosion inhibitor. Total corrosion inhibition of the mild steel was noticed by using 150 ppm at dynamic condition of 500 rpm.

Electrochemical Investigation of Triadimenol as Corrosion Inhibitor for Copper in 0.5mol/L H2SO4 Solution

2013 ◽  
Vol 830 ◽  
pp. 81-85
Author(s):  
Song Song Li ◽  
Wei He ◽  
Zhi Hua Tao ◽  
Shou Xu Wang
Keyword(s):  
Sulfuric Acid ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Polarization Measurement ◽  
Electrochemical Investigation ◽  
Copper Corrosion ◽  
Inhibitor Concentration ◽  
Mechanism Of Inhibition ◽  
Eis Measurements ◽  
Cathodic And Anodic Processes

This paper chose triadimenol as a corrosion inhibitor of copper in 0.5mol/L sulfuric acid. The properties of corrosion inhibition were investigated by the polarization measurement and electrochemical impedance spectroscopy (EIS). Polarization curves showed that both cathodic and anodic processes of copper corrosion were suppressed. The inhibiting efficiency increased as the increment of the inhibitor concentration and reached 86.7% at 50 mg/L. The results obtained from EIS measurements are in line with that obtained from potentiodynamic polarization. Finally, a mechanism of inhibition is proposed and discussed.

scholarly journals Hexamine as Corrosion Inhibitors forZinc in Phosphoric Acid

2010 ◽  
Vol 7 (s1) ◽  
pp. S1-S6 ◽  
Author(s):  
R. T. Vashi ◽  
Diksha Naik
Keyword(s):  
Phosphoric Acid ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Polarization Curves ◽  
Inhibitor Concentration ◽  
Straight Line

The corrosion of zinc in phosphoric acid containing hexamine has been studied at different acid concentrations, inhibitor concentration and temperatures. Corrosion increases with the concentration of acid and the temperature. The inhibition efficiency (IE) of hexamine increases with the concentration of inhibitor. The IE decreases with the increase in concentration of acid. As temperature increases, percentage of inhibition decreases. The plot of log (Θ/1-Θ)versuslog C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes.

scholarly journals Mechanism and inhibition efficiency of biomass Tetraselmis chuii sp. on carbon steel corrosion in the environment under the conditions of oil wells

Al-Kimia ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Yayan - Sunarya ◽  
Heli Siti H ◽  
Munawaroh Munawaroh ◽  
Gun Gun Gumilar
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Protective Layer ◽  
Steel Corrosion ◽  
Marine Microorganisms ◽  
Tetraselmis Chuii ◽  
Mechanism Of Inhibition ◽  
Biomass Extract ◽  
Inhibition Ability

Corrosion control on petroleum pipe wells can only be done through the addition of corrosion inhibitors. In this study, the corrosion inhibitors studied were sourced from marine microorganisms, namely the type of microalgae Tetraselmis chuii sp. The aim to be achieved in this study was to determine the mechanism and efficiency of inhibition of the extraction of microalgae biomass in corrosion of carbon steel in an environment of petroleum conditions. To achieve this goal, a potentiodynamic polarization method (Tafel extrapolation) was used and the Electrochemistry Impedance Spectroscopy (EIS) method used the galvanostat-potentiostat device (Voltalab 40, PGZ 301). The results obtained from this study indicate that API 5L X65 carbon steel in the petroleum environment is very significantly corroded, caused by acidic media derived from acetic acid and dissolved CO2. The inhibition ability of the Tetraselmis chuii sp. Biomass extract. in line with the increasing extraction concentration reaching optimum at a concentration of 250 ppm with inhibition efficiency reaching 70%. The mechanism of inhibition takes place through the formation of a protective layer adsorbed on the surface of carbon steel. The protective membrane formed is uneven and tends to be porous.

scholarly journals Water-soluble chitosan from shrimp and mussel shells as corrosion inhibitor on tinplate in 2% NaCl

2019 ◽  
Vol 15 (2) ◽  
pp. 212-217
Author(s):  
Harmami Harmami ◽  
Ita Ulfin ◽  
Arina Hidayatus Sakinah ◽  
Yatim Lailun Ni’mah
Keyword(s):  
Corrosion Inhibitor ◽  
Polymer Chain ◽  
Potentiodynamic Polarization ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Water Soluble ◽  
Polarization Method ◽  
Shrimp Shells ◽  
Maximum Inhibition ◽  
Mussel Shells

Water-Soluble Chitosan (WSC) was synthesized form shrimp and mussel shells wastes and used as corrosion inhibitor on tinplate in 2% NaCl. Chitin was extracted from shrimp and mussel shells wastes by demineralization and deproteinization reactions.Chitin was deacetylated to crude chitosan. WSC was obtained by shortening the crude chitosan polymer chain using H2O2. WSC was characterized by FTIR. WSC performance as corrosion inhibitor on tinplate in 2% NaCl was studied by weightloss and potentiodynamic polarization methods. WSC inhibition efficiency was studied in various concentrations from 10-1500 mg/L. Maximum inhibition efficiencies of WSC from shrimp shells waste were 72,73% (weightloss method) and 91,41% (potentiodynamic polarization method), while maximum inhibition efficiency of WSC from mussel shells waste was 54,55% (weightloss method) with the addition of 1300 mg/L WSC concentration. Weightloss studies revealed that WSC acted as mixed type of inhibitor and obeyed Freundlich adsorption isoterm.

scholarly journals Corrosion Inhibition of Bark Extract of Euphorbia royleana on Mild Steel in 1M HCl

2019 ◽  
Vol 40 ◽  
pp. 25-29
Author(s):  
Bishal Thapa ◽  
Dipak Kumar Gupta ◽  
Amar Prasad Yadav
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
Bark Extract ◽  
Potential Measurement ◽  
Maximum Inhibition ◽  
Weight Loss Method ◽  
Loss Method ◽  
Loss Experiment

The bark extract of Euphorbia royleana as a green corrosion inhibitor was studied in 1M HCl using weight-loss method and potential measurement. The results show that the bark extract of Euphorbia royleana is an effective anti-corrosion inhibitor of mild steel in acidic media. The corrosion rate decreases with the time of immersion. Weight loss experiment shows that the loss in weight decreases with the time of immersion and inhibition efficiency increases with the concentration of extract. It was observed that maximum inhibition efficiency is 99.60% in 100% concentration of extract. Potential measurement study shows that bark extracts act as a mixed type of inhibitor i.e. inhibits both anodically as well as cathodically. 

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