scholarly journals Investigation on Two Compounds of O,O’-dithiophosphate Derivatives as Corrosion Inhibitors for Q235 Steel in Hydrochloric Acid Solution

2017 ◽  
Vol 15 (1) ◽  
pp. 263-271 ◽  
Author(s):  
Chuan Lai ◽  
Xiaogang Guo ◽  
Jian Wei ◽  
Bin Xie ◽  
Like Zou ◽  
...  
Keyword(s):  
Mixed Type ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Q235 Steel ◽  
Measurement Results ◽  
Efficiency Increase ◽  
Ft Ir ◽  
Hcl Concentration ◽  
Derivatives Of ◽  
Mixed Type Inhibitor

AbstractIn this work, the O,O’-dithiophosphate derivatives of S-4-methylbenzyl-O,O’-di(phenyl) dithiophosphate (Inhi-Ph) and S-4-methyl benzyl-O,O’-di(4-bromophenyl) dithiophosphate (Inhi-BrPh) were synthesized and characterized by elemental analysis, FT-IR, 1H, 13C and 31P NMR. Meanwhile, the corrosion inhibition of Q235 steel in HCl solution by synthesized inhibitors was evaluated by weight loss and electrochemical measurements. Measurement results indicate that the two inhibitors of Inhi-Ph and Inhi-BrPh are mixed-type inhibitor, the inhibition efficiency increase with inhibitor concentration increasing, decrease with HCl concentration and temperature increasing. The adsorption of Inhi-Ph and Inhi-BrPh on Q235 steel surface obeys Langmuir isotherm, which belongs to chemical adsorption.

Adsorption Behavior and Corrosion Inhibition of 2-Benzothiazolethiol for Q235 Steel in Hydrochloric Acid Solution

2012 ◽  
Vol 212-213 ◽  
pp. 947-950
Author(s):  
Tao Wang ◽  
Xi Yang He ◽  
Xue Yang
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Hydrochloric Acid Concentration ◽  
Adsorption Behaviour ◽  
Q235 Steel ◽  
Increase With Increase ◽  
Mixed Type Inhibitor

The weight loss measurements and potentiodynamic polarization techniques are used to assess the inhibitive and adsorption behaviour of 2-Benzothiazolethiol (BTT) for Q235 steel in hydrochloric acid solution. The inhibition efficiency is found to increase with increase in BTT concentration but decrease with rise in temperature and hydrochloric acid concentration. The results show that BTT acts as a good corrosion inhibitor in hydrochloric acid solution. Adsorption of BTT is found to obey Langmuir isotherm. Polarization curves indicate BTT is a mixed-type inhibitor.

N,N-Diethylammonium O,O’-Di(3-methylphenyl)dithiophosphate as Corrosion Inhibitor for Q235 Steel in HCL Solution

2013 ◽  
Vol 781-784 ◽  
pp. 291-294 ◽  
Author(s):  
Sha Sha Zhu ◽  
Qin Huan Yang ◽  
Bin Xie ◽  
Yu Long Li ◽  
Xiao Lin ◽  
...  
Keyword(s):  
Weight Loss ◽  
Immersion Time ◽  
Inhibition Efficiency ◽  
Weight Loss Measurement ◽  
Q235 Steel ◽  
Leading Role ◽  
Effects Of Temperature ◽  
Hcl Concentration ◽  
Hcl Solution ◽  
Mixed Type Inhibitor

The corrosion inhibition of N,N-diethylammonium O,O-di (3-methylphenyl) dithio-phosphate (NDOMD) for Q235 steel in HCl solution was studied by electrochemical measurements and weight loss measurements. And the effects of temperature, HCl concentration and immersion time were also studied. Polarization curves indicate the NDOMD is a mixed-type inhibitor which anodic plays a leading role. The studies of weight loss measurement show that the inhibition efficiency was up to 94.46% at the NDOMD concentration of 100 mg·L-1 in 1.0 mol.L-1 HCl solution at 30°C. The adsorption of NDOMD on Q235 steel surface obeys the Langmuir isotherm.

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 Inhibition of Pipeline Steel Corrosion in 0.5 M H2SO4 Using Cotyledon of Chrysophyllum Albidum

2020 ◽  
Vol 24 (4) ◽  
pp. 691-697
Author(s):  
E.P. Othaki ◽  
N.C. Ngobiri
Keyword(s):  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Pipeline Steel ◽  
Steel Corrosion ◽  
Langmuir Adsorption ◽  
Extract Concentration ◽  
Ir Studies ◽  
Ft Ir ◽  
As Adsorption

The corrosion inhibition characteristics of Chrysophyllum albidum cotyledon extract was studied as a green and sustainable corrosion inhibitors for pipeline steel in acidic environment attemperatures, 303,313 and 323K using gravimetric technique.The results obtained showed that the inhibition efficiency increased with increase in extract concentration but decrease with increase in temperature. The extract attained an inhibition efficiency of 94 % with 5 g/L at 303 K and 52.2 % with 1 g/L at 333K. Also increase in concentration of the extract lead to increase in activation energydepicting an exothermic process.Fourier transform infrared spectroscopy (FT-IR) studies showed the mode of inhibition as adsorption of phytochemicals from the extract on pipeline steel surface. Langmuir adsorption isotherm best fitted into the adsorption process which is spontaneous and physical. Keywords: Chrysophyllum albidum, Pipeline steel, Inhibition, Adsorption.

The corrosion inhibition of carbon steel in 5 per cent HCl by Momordica charantia extract

2014 ◽  
Vol 61 (4) ◽  
pp. 255-260 ◽  
Author(s):  
Xie Xuejun* ◽  
Xiao Peng* ◽  
He Jie ◽  
Xiao Wen ◽  
Fu Qiang ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Xps Analysis ◽  
Content Type ◽  
Isotherm Equation ◽  
Inhibition Effect ◽  
Langmuir Isotherm Equation ◽  
Ir Analysis ◽  
Mixed Type Inhibitor

Purpose – To study the inhibition effect and mechanism of the Momordica charantia extract (BM) to 20 A carbon steel in 5 per cent HCl. Design/methodology/approach – The weight loss, polarization curve, infrared spectrum (IR) analysis and X-ray photoelectron spectrum (XPS) analysis were carefully investigated to indicate the inhibition effect and mechanism of the BM to 20 A carbon steel in 5 per cent HCl. Findings – BM was composed of C, N and O. Functional groups such as N–H and C=O were found in BM. The inhibition efficiency increased with the increasing concentration of BM. BM behaved as a mixed-type inhibitor, and the inhibition of BM to 20 A carbon steel might be its adsorption through the coordinate covalent bonding among the lone pair electrons of N and O and the empty 3d orbits of Fe, and the adsorption on the surface of 20 A carbon steel obeyed the Langmuir isotherm equation. Research limitations/implications – The inhibition of the BM to 20 A carbon steel in 5 per cent HCl. Practical implications – BM could be used in 5 per cent HCl to prevent 20 A carbon steel from corrosion. Social implications – BM could be used in the chemical cleaning of the boilers to prevent the thermal equipments from corrosion. Originality/value – The inhibition effect and mechanism of the BM to 20 A carbon steel were studied by the weight loss, polarization curve, IR analysis and XPS analysis. BM was composed of C, N and O. Functional groups such as N–H and C=O were found in BM. BM behaved as a mixed-type inhibitor. The inhibition efficiency increased with the increasing concentration of BM, and the adsorption on the surface of 20 A carbon steel obeyed the Langmuir isotherm equation.

Solvent Free Glycolysis of Plastic Waste as Green Corrosion Inhibitor for Carbon Steel in Sulfuric Acid

2017 ◽  
Vol 20 (3) ◽  
pp. 141-149 ◽  
Author(s):  
Reda Abdel Hameed
Keyword(s):  
Sulfuric Acid ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
Solvent Free ◽  
Manganese Acetate ◽  
Ionic Surfactant ◽  
Pet Waste ◽  
Galvanostatic Polarization ◽  
Efficiency Increase ◽  
Ft Ir

Solvent free efficient green glycolysis of Polyethylene terephthalate waste, PET, in this respect, PET waste was subjected to depolymerization with propylene glycol in the presence of manganese acetate as a catalyst, the product is Bis-(3-hydroxy-propyl)-terephthalate, BHPT, as non-ionic surfactant was separated, characterized by FT-IR and 1HNMR, BHPT was evaluated as corrosion inhibitor for steel in the presence of 1.0 M sulfuric acid by chemical and electrochemical methods, the corrosion inhibition efficiency increase with inhibitor concentration and decrease with temperatures, the galvanostatic polarization curves indicate that the BHPT, compound act as mixed inhibitor, the impedance of the inhibited solution has increased with the increase in the concentration of the inhibitor. the inhibition due to adsorption of the inhibitor molecules on the steel surface, the adsorption obey Langmuir adsorption isotherm. Thermodynamic parameters were computed and discussed, Scanning electron microscope (SEM) was used to study the surface morphology of steel in absence and presence of the used inhibitor, hydrogen evolution techniques was used to evaluate the inhibition efficiency of the BHPT inhibitor compound. the data obtained from different techniques are in good agreement to each other and show the BHPT, surfactant derived from PET, waste considered as good corrosion inhibitor for steel in sulfuric acid.

Inhibition Effect of N-Octyl-2-Pyrrolidonium Chloride on the Corrosion of Mild Steel in Acidic Medium

2013 ◽  
Vol 634-638 ◽  
pp. 651-654
Author(s):  
Zi Chong Zhuang ◽  
Bao Hua Huang ◽  
Jun Liu ◽  
Yu Jing Lu ◽  
Zhan Chang Pan ◽  
...  
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Acidic Medium ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Electrochemical Techniques ◽  
Inhibition Mechanism ◽  
Inhibition Effect ◽  
Hcl Solution ◽  
Mixed Type Inhibitor

A new ionic liquid, N-octyl-2-pyrrolidonium chloride (NOPC), were synthesized and evaluated as inhibitors for mild steel (Q235) corrosion in 1 mol/L HCl. The adsorption behavior and corrosion inhibition mechanism of NOPC for mild steel in HCl solution were investigated by using weight loss measurements, electrochemical techniques, and SEM. The inhibition efficiency increases with the increasing concentration of NOPC in 1 mol/L HCl and decreases as the temperature increases. The results indicate that NOPC is able to function as a mixed type inhibitor.

scholarly journals INHIBISI KOROSI BAJA RINGAN MENGGUNAKAN BAHAN ALAMI DALAM MEDIUM ASAM KLORIDA: Review

2019 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
Yeni Stiadi ◽  
Syukri Arief ◽  
Hermansyah Aziz ◽  
Mai Efdi ◽  
E. Emriadi
Keyword(s):  
Mild Steel ◽  
Plant Extracts ◽  
Mixed Type ◽  
Corrosion Inhibitors ◽  
Industrial Applications ◽  
Acidic Media ◽  
Acidic Environments ◽  
Corrosion Of Steel ◽  
Metal Etching ◽  
Mixed Type Inhibitor

The corrosion of steel and its alloys is an important problem in industry, especially in acidic environments. Mild steel is one of the important alloys of iron which has many industrial applications because of its excellent mechanical properties, but mild steel is susceptible to corrosion. Corrosion problems need to be a concern and must be handled properly. Hydrochloric acid is widely used for pickling, cleansing, decomposition and metal etching, on the other hand also contributes to corrosion of metal surfaces. Plant extracts investigated the properties, mechanisms of adsorption and efficiency of inhibition as environmentally friendly corrosion inhibitors for various steel materials in different acidic media. The efficiency of corrosion inhibition of steel from plant extracts analyzed ranged from 72-98% and generally as a mixed-type inhibitor. Most of the inhibitors are adsorbed on the steel surface through a physisorption mechanism.

scholarly journals Electrochemical and quantum chemical parameters of (-)-(S)-9-flu¬oro-2,3-dihydro-3-methyl-10-(4-methyl-1-pipera-zinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acidas anti-corrosive agent for API 5L X-52 steel

2020 ◽  
Vol 10 (3) ◽  
pp. 234-244
Author(s):  
Fidelis Ebunta Abeng ◽  
Magdalene Edet Ikpi ◽  
Victor E. Okpashi ◽  
Onumashi A. Ushie ◽  
Mbang E. Obeten
Keyword(s):  
Quantum Chemical ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Chemical Parameters ◽  
Polarization Method ◽  
Quantum Chemical Parameters ◽  
Inhibitive Action ◽  
Mixed Type Inhibitor

The inhibitive action of (-)-(S)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (Levaquin) on API 5L X-52 steel in 2 M HCl solution was investigated using potentiodynamic polarization method and quantum chemical study. Levaquin drug showed good inhibition efficiency of 88 and 95 % at 303 and 323 K, respectively. The results of experimental measurements revealed that Levaquin drug works as a mixed type inhibitor. Langmuir thermodynamic model was tested to describe the mode of inhibitor adsorption on the steel surface. The quantum chemical calculations confirmed the efficacy of Levaquin drug as a corrosion inhibitor.

Adsorption Behavior and Corrosion Inhibition of EPP for Q235 Steel in H2SO4 Solution

2011 ◽  
Vol 287-290 ◽  
pp. 2923-2926 ◽  
Author(s):  
Li Ke Zou ◽  
Chuan Lai ◽  
Bin Xie ◽  
Xue Yang ◽  
Zhen Xiang ◽  
...  
Keyword(s):  
Immersion Time ◽  
Mixed Type ◽  
Langmuir Adsorption Isotherm ◽  
Weight Loss Measurement ◽  
Q235 Steel ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Effects Of Temperature ◽  
Cathodic And Anodic Processes ◽  
Mixed Type Inhibitor

The inhibition effect of N,N-diethylammonium O,O'-di(2-phenylethyl)dithiophosphate (EPP, [NH2(Et)2][S2P(OCH2CH2Ph)2]2) against the corrosion of Q235 steel in H2SO4solution was studied by weight loss measurement, potentiodynamic polarization and SEM(scanning electron microscope) techniques. The results show that EPP acts as an excellent corrosion inhibitor in 5% H2SO4by suppressing simultaneously the cathodic and anodic processes via chemical adsorption on Q235 steel surface, which complies with the Langmuir adsorption isotherm. Polarization curves indicate EPP is a mixed-type inhibitor. The effects of temperature, acid concentration and immersion time were also studied.

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