scholarly journals Raphanus sativus L. Extract as a Scale and Corrosion Inhibitor for Mild Steel in Tap Water

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
G. Vasyliev ◽  
V. Vorobyova ◽  
T. Zhuk
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Raphanus Sativus ◽  
Tap Water ◽  
Surface Film ◽  
Ethanol Extract ◽  
Linear Polarization Resistance ◽  
Raphanus Sativus L ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The Raphanus sativus L. ethanol extract was prepared by radish cake maceration in ethanol end tested as a scale and corrosion inhibitor of mild steel in tap water. Antiscalant efficiency was tested with electrochemical and thermal scaling techniques, and changes in hardness content were determined titrimetrically. No deposits were found on the metal surface at the extract concentration of 10 mL/L in chronoamperometry test, and scaling suppression was established 5 times in thermal scaling conditions. The linear polarization resistance technique was used to determine corrosion rate. Inhibition efficiency was found to be 75% in thermal scaling conditions. The formation of the surface film was responsible for both scaling and corrosion suppression on mild steel surface as was established with FT-IR spectroscopy and SEM. The surface film was found to contain polymerization products of isothiocyanates.

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 Corrosion inhibition and adsorption studies by Pogostemonquadrifolius methanolic stem extract (PQMSE) on mild steel in 1M HCL

2018 ◽  
Vol 6 (2) ◽  
pp. 157
Author(s):  
Jisha M ◽  
Zeinul Hukuman N. H ◽  
Leena P
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Studies ◽  
Corrosion Studies ◽  
Weight Loss Method ◽  
Stem Extract ◽  
Ft Ir ◽  
Corrosion Inhibition Efficiency ◽  
Loss Method ◽  
Ft Ir Spectroscopy

Pogostemon quadrifolius methanolic stem extract (PQMSE) has been investigated as non toxic green corrosion inhibitor for mild steel in 1 M HCl. Corrosion rates were evaluated at 303 K, 313 K and 323 K by weight loss method at varying inhibitor concentrations. Using electrochemical impedence spectroscopy (EIS) and polarisation techniques, corrosion studies were done at 303 K in various inhibitor concentrations. Adsorption studies were also conducted to study the mechanism of corrosion inhibition. Scanning electron microscopy (SEM) and Fourier – transform infrared (FT-IR) spectroscopy were used to study the surface morphology of mild steel. Electrochemical studies reveal that PQMSE exhibit excellent corrosion inhibition efficiency and it function as a mixed type of inhibitor at 303 K. The surface interaction of PQMSE on mild steel in 1 M HCl was obeying Langmiur adsorption isotherm at all studied temperatures.

scholarly journals Pengaruh Metode Isolasi a-mangostin dari Kulit Buah Manggis (Garcinia mangostana L.) terhadap Rendemen α-mangostin

2019 ◽  
Vol 5 (2) ◽  
pp. 144
Author(s):  
Sri Idawati ◽  
Aliefman Hakim ◽  
Yayuk Andayani
Keyword(s):  
Extraction Method ◽  
Ethanol Extract ◽  
Bioactive Compound ◽  
Extraction Methods ◽  
Garcinia Mangostana ◽  
Main Compound ◽  
Pure Compounds ◽  
Ft Ir ◽  
Layer Chromatography ◽  
Ft Ir Spectroscopy

Abstract: The purpose of this research is to know the effect of the isolation method of the yield of α-mangostin resulting from mangosteen rind. Mangosteen (Garcinia mangostana L.) is the source of xanthone secondary metabolites. Derivatives xanthone which is the main bioactive compound and becomes a major compound in the mangosteen plant, namely α-mangostin. This main compound has been isolated from ethanol extract on mangosteen rind using different extraction methods namely maceration and soxhletation. Purification was done by the recrystallization method with solvent ethanol: aquades (1:1). The Maceration extraction method produce the yields of extract and the yields of pure compounds (α-mangostin) is higher than that of soxhletation. The Maceration extraction method produces yields of extract 30,12% and yields of α-mangostin 4,27% while the soxhletation extraction method produce the yields of extract 26,34% and the yields of α-mangostin 2,13%. This yellow powder isolate has a melting point of 179,7 ºC. Purification is monitored by thin layer chromatography (TLC) and structural elucidation is carried out using FT-IR spectroscopy data. Key Words: Isolation, α-mangostin, Garcinia mangostana

Protecting Mild Steel from Acid Corrosion Using Extract from Ocimum gratissimum Leaves

2017 ◽  
Vol 73 ◽  
pp. 9-21 ◽  
Author(s):  
Chinonso Blessing Adindu ◽  
Maduabuchi Arinzechukwu Chidiebere ◽  
Francis Chizoruo Ibe ◽  
Cynthia E. Ogukwe ◽  
Emmanuel Emeka Oguzie
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Fourier Transform Infrared Spectroscopy ◽  
Acid Corrosion ◽  
Ethanol Extract ◽  
Fourier Transform Infrared ◽  
Corrosion Monitoring ◽  
Ocimum Gratissimum

The anti-corrosion properties of the ethanol extract of Ocimum gratissimum (OG) leaves on the corrosion of mild steel in both 1 M HCl and 0.5 M H2SO4 was studied using gravimetric, electrochemical, Fourier transform Infrared spectroscopy and scanning electron microscopy methods of corrosion monitoring. The gravimetric results revealed that the inhibitor maintained good inhibition efficiency even at 120 hours of immersion. The electrochemical results showed that OG extract functioned as a mixed type corrosion inhibitor for mild steel in both 1 M HCl and 0.5 M H2SO4, inhibiting both the anodic and cathodic partial reactions via adsorption of the extract constituents on the metal/solution interface. Fourier Transform Infrared Spectroscopy and surface examination results confirmed the adsorption of the extract, organic constituents on the mild steel surface. The results showed that OG ethanol extract functioned as a good corrosion inhibitor for mild steel in both 1 M HCl and 0.5 M H2SO4 solutions.

Experimental and theoretical studies on inhibition of benzothiazines against corrosion of mild steel in acidic medium

2017 ◽  
Vol 64 (3) ◽  
pp. 306-314 ◽  
Author(s):  
Venkatesan Hemapriya ◽  
Mayakrishnan Prabakaran ◽  
Kandasamy Parameswari ◽  
Subramaniyan Chitra ◽  
Seung-Hyun Kim ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Quantum Chemical ◽  
Steel Corrosion ◽  
Experimental Results ◽  
Content Type ◽  
Mild Steel Corrosion ◽  
Ft Ir ◽  
Experimental And Theoretical Studies ◽  
Ft Ir Spectroscopy

Purpose The aim of this paper was to investigate the corrosion inhibition potential of two synthesized benzothiazines, namely, 3,4-dihydro-2-methoxycarbonylmethyl-3-oxo-2H-1,4-benzothiazine (1) and ethyl 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-2-carboxylate (2) on mild steel corrosion in 1M H2SO4. Design/methodology/approach Corrosion inhibition efficiency (IE%) was studied by weight loss measurements, potentiodyanmic polarization method, alternating current (AC) impedance spectroscopy, fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy. Quantum chemical approach was used to complement the experimental results. Findings The results obtained show that the IE% increased with inhibitor concentration and follow the order 2 > 1, obeying Langmuir adsorption isotherm. The calculated quantum chemical indices were consistent with experimental results. Originality/value This paper provides information on the inhibitive properties of new set of benzothiazines on mild steel corrosion in 1M H2SO4.

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