Green corrosion inhibitor: Cymbopogon schoenanthus extract in an acid cleaning solution for aluminum brass

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohamed A. Deyab ◽  
Mohsen Mohammed Al-Qhatani
Keyword(s):  
Corrosion Inhibitors ◽  
Chemical Components ◽  
Ftir Analysis ◽  
Acid Cleaning ◽  
Green Corrosion Inhibitor ◽  
Cleaning Solution ◽  
Polarization Technique ◽  
Ft Ir ◽  
Distillation Plant ◽  
Cymbopogon Schoenanthus

Abstract The purpose of this study was to see if Cymbopogon schoenanthus aerial extract (CSA extract) could reduce the corrosion of aluminum brass in acid cleaning solutions in the distillation plant. For this assessment, measurements of weight loss and polarization technique have all been used. We discovered that at 250 ppm, the efficiency of CSA extract was excellent (97%). Polarization assessments confirmed that the organic compounds in CSA extract were effective mixed-type corrosion inhibitors. HPLC and FTIR analysis were used to explore the key chemical components of CSA extract. CSA extract caused the corrosion process to have a higher energy barrier. Observations of SEM and FT-IR spectra confirmed that CSA extract prevents corrosion attacks at the aluminum brass’s surface.

High Resolution Stereography of Complementary Freeze-Fracture Replicas Reveals the Presence of Depressions Opposite Membrane Associated Particles of Split Membranes

1971 ◽  
Vol 29 ◽  
pp. 442-443
Author(s):  
Russell L. Steere
Keyword(s):  
High Resolution ◽  
Cardiac Muscle ◽  
Electron Micrographs ◽  
Chromic Acid ◽  
Freeze Fracture ◽  
Distilled Water ◽  
Fine Scale ◽  
Acid Cleaning ◽  
Cleaning Solution

Complementary replicas have revealed the fact that the two common faces observed in electron micrographs of freeze-fracture and freeze-etch specimens are complementary to each other and are thus the new faces of a split membrane rather than the original inner and outer surfaces (1, 2 and personal observations). The big question raised by published electron micrographs is why do we not see depressions in the complementary face opposite membrane-associated particles? Reports have appeared indicating that some depressions do appear but complementarity on such a fine scale has yet to be shown.Dog cardiac muscle was perfused with glutaraldehyde, washed in distilled water, then transferred to 30% glycerol (material furnished by Dr. Joaquim Sommer, Duke Univ., and VA Hospital, Durham, N.C.). Small strips were freeze-fractured in a Denton Vacuum DFE-2 Freeze-Etch Unit with complementary replica tooling. Replicas were cleaned in chromic acid cleaning solution, then washed in 4 changes of distilled water and mounted on opposite sides of the center wire of a Formvar-coated grid.

Anti-Corrosive Effect of Jordanian-Bay- Leaves Aqueous Extract on Mild Steel in 1.0 M Hydrochloric Acid Solution

2021 ◽  
Vol 17 ◽  
pp. 614-618
Author(s):  
Nawal H. Bahtiti ◽  
Ibrahim Abdel-Rahaman
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Aqueous Extract ◽  
Corrosion Inhibitors ◽  
Polarization Technique ◽  
Corrosive Effect ◽  
The Impact ◽  
Natural Inhibitors ◽  
Temkin Adsorption Isotherm ◽  
Hcl Solution

Natural inhibitors are the most crucial manner to lessen the corrosion price of various business metals. There are several strategies being used with corrosion inhibitors. One technique being used is the Electrochemical strategies. The gain with this technique is their brief size time and mechanistic information. It is beneficial in the corrosion's layout safety techniques besides the layout of the brand new inhibitors, there are 3 styles of corrosion inhibitors as anodic inhibitors, cathodic inhibitors, over one inhibitor. The corrosion inhibition of slight metallic in 1.0 M HCl solution with the aid of using Jordanian -Bay- leaves extract has been studied with the use of potentiodynamic polarization technique. Results received a display that Bay- leaves aqueous extract behaves as an anodic inhibitor for slight metallic in 1.0 M HCl solution. The inhibitor capabilities thru adsorption following Temkin adsorption isotherm. The impact of parameters like temperature and inhibitor awareness at the corrosion of slight metallic has additionally been studied.

scholarly journals SCREENING FOR PHYTOCHEMICALS AND FTIR ANALYSIS OF MYRISTICA DACTYLOIDS FRUIT EXTRACTS

2016 ◽  
Vol 9 (1) ◽  
pp. 315 ◽  
Author(s):  
P. Rajiv ◽  
A. Deepa ◽  
P. Vanathi ◽  
D. Vidhya
Keyword(s):  
Fourier Transform ◽  
Methanolic Extract ◽  
Phytochemical Analysis ◽  
Ftir Analysis ◽  
Spectroscopy Analysis ◽  
Standard Methods ◽  
Fruit Extracts ◽  
Ft Ir ◽  
Amine Groups ◽  
Ir Analysis

<p><strong>Objective: </strong>The present investigation focus on screening of phytochemicals and FT-IR analysis of <em>Myristica dactyloids </em>fruit extracts. The fruit extracts were prepared using five different solvents.</p><p><strong>Methods: </strong>The phytochemical analysis and FT-IR (Fourier transform infrared spectroscopy) analysis were performed using standard methods.</p><p><strong>Results: </strong>The results reveals that the alkaloids, steroids, flavonoids, phenolic compounds, proteins, carbohydrates, cardio glycosides and saponins were present in methanolic extract when compared to other solvent extracts. FT-IR analysis shows the presence of different functional groups such as carboxylic acids, aromatics, alkanes, alcohols, phenols, aliphatic amines, alkenes and amine groups in the fruit extracts.</p><p><strong>Conclusion: </strong>The study concluded that the methanolic extract (<em>M. dactyloides </em>fruit) has potential bioactive compounds.</p>

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 Antioxidant and Total Phenolic Content of Breadfruit (Artocarpus altilis) Leaves

2018 ◽  
Vol 150 ◽  
pp. 06007 ◽  
Author(s):  
Lee Yit Leng ◽  
Nuramira binti Nadzri ◽  
Khor Chu Yee ◽  
Norawanis binti Abdul Razak ◽  
Abdul Razak Shaari
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Copper Ions ◽  
Radical Scavenging ◽  
Chemical Components ◽  
Total Phenolic ◽  
Ftir Analysis ◽  
Artocarpus Altilis ◽  
Methanolic Extracts

This work aims to determine antioxidant, total phenolic content and Fourier transform infrared spectroscopy (FTIR) analysis of breadfruit leaves which are essential in management of diabetes. The methanolic extracts of breadfruit leaves was used to analyze for total phenolic content and antioxidant. Total phenolic content of the extracts was measured using the Folin–Ciocalteu assay while the antioxidant activity of plant extracts was measured by the 1, 1-diphenyl-2-picryhyradrazyl (DPPH) radical scavenging assay. FTIR analysis was used to determine the chemical components in the leaves. Total phenolic content in fresh breadfruit leaves (144.16 mg/g ± 17.98) was comparable to those of green tea. The results showed the breadfruit leaves extracts exhibited potent antioxidant activity. The presence of OH group also suggests antioxidant capacity of breadfruit leaves to deactivate free radicals as glucose itself could react with hydrogen peroxide in the presence of iron and copper ions to form hydroxyl radical.

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.

Development of a green corrosion inhibitor for use in acid cleaning of MSF desalination plant

Desalination ◽  
2020 ◽  
Vol 495 ◽  
pp. 114675
Author(s):  
I.B. Obot ◽  
M.M. Solomon ◽  
I.B. Onyeachu ◽  
S.A. Umoren ◽  
Abdelkader Meroufel ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Acid Cleaning ◽  
Desalination Plant ◽  
Green Corrosion Inhibitor

scholarly journals Morphology and Surface Properties of Poly (L-lactic acid)/Captopril Composite Nanofiber Membranes

2012 ◽  
Vol 7 (1) ◽  
pp. 155892501200700 ◽  
Author(s):  
Anfang Wei ◽  
Juan Wang ◽  
Xueqian Wang ◽  
Dayin Hou ◽  
Qufu Wei
Keyword(s):  
Lactic Acid ◽  
Composite Nanofibers ◽  
Chemical Components ◽  
Pore Width ◽  
Surface Areas ◽  
Composite Nanofiber ◽  
Mass Fractions ◽  
Ft Ir ◽  
Nanofiber Membranes ◽  
Better Than

In this study, Poly (L-lactic acid)/Captopril composite nanofiber membranes were electrospun for drug delivery. Different mass fractions of Poly (L-lactic acid), different ratios of Captopril and the influences of PEG4000 added in the spinning solution are discussed. The morphology, chemical components, the surface areas and pore sizes, wettability of the composite nanofiber membranes were investigated. The results showed that the diameters of the composite nanofibers increased with the increase of Poly (L-lactic acid) mass fractions, the diameters decreased with the increase of Captopril content as well as the addition of the surfactant. Fourier Transform Infrared (FT-IR) showed the chemical components of Captopril remained unchanged when it was electrospun into the composite nanofibers. The surface areas pore width and pore volume of the composite nanofibers became a little larger than those of poly (L-lactic acid) nanofibers, and the wettability of the composite nanofiber membranes was better than those of poly (L-lactic acid) nanofiber membranes. Wettability was improved by an increase of the drug load amount.

Advanced Alkali Cleaning Solution for Simplification of Semiconductor Cleaning Process

1997 ◽  
Vol 477 ◽  
Author(s):  
Hitoshi Morinaga ◽  
Masumi Aoki ◽  
Toshiaki Maeda ◽  
Masaya Fujisue
Keyword(s):  
Substrate Surface ◽  
Chelating Agent ◽  
Metallic Impurity ◽  
Cleaning Process ◽  
Drastic Reduction ◽  
Acid Cleaning ◽  
Cleaning Solution ◽  
Cleaning Technology ◽  
Cleaning Cost ◽  
Metallic Impurities

ABSTRACTNH4OH/H2O2/H2O (called APM or SC–1) cleaning combined with megasonic irradiation is found to feature outstanding removal efficiency for various types of particulate contaminant. The conventional APM cleaning, however, allows metallic impurity in solution to adhere onto substrate surface, and it must be followed by acid cleaning such as HCI/IH2O2/H2O (called HPM or SC–2) cleaning to remove metallic impurity from substrate. The advanced APM cleaning using MC–1 which is alkali cleaning agent containing chelating agent has been developed, and this new cleaning is found capable for preventing various metallic impurities including Al in solution from contaminating substrate surface. Besides, with cleaning conditions optimized, the advanced APM cleaning using MC–1 can also remove metallic impurity from substrate surface. In short, this modified APM cleaning is capable for removing particle and metallic impurity at the same time, which is not possible with the conventional cleaning technology. The cleaning process of semiconductor manufacturing process can be simplified if HPM cleaning is eliminated by introducing the advanced APM cleaning using MC–1. This leads to drastic reduction of cleaning cost and improvement of throughput of the cleaning process.

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