65 research outputs found
Caladium bicolor and Wild Dioscorea dumetorum Starches As Dual Purpose Polymer Additive
Increased elastic modulus and ultimate tensile strength of low density
polyethylene has been achieved by incorporating Caladium bicolor
(ornamental cocoyam) and wild Dioscorea dumetorum (sweet yam)
starches into low density polyethylene using a standard hot-melt
compounding technique. Some mechanical properties of compression
moulded dumb bell shaped films of low density polyethylene containing
up to a maximum of 20 wt % of each starch is reported. Increased
density of the composite with time after being buried for a total of 12
weeks in composting environment is an evidence of the degradation of
LDPE which may be linked to an initial breakdown of starch by
microorganism in the soil which probably give rise to diffusion of
unsaturated lipids into the porous polymer resulting in degradation by
auto-oxidation. @JASE
CORROSION INHIBITOR COMPOSITION AND METHODS OF INHIBITING CORROSION DURING ACID PICKLING
A corrosion inhibitor composition , which includes i ) an
aqueous alcohol base fluid , ii ) a mixture of at least three
polysaccharides selected from carboxymethyl cellulose ,
gum arabic , pectin , a salt of alginic acid , chitosan , dextran ,
hydroxyethyl cellulose , and soluble starch , with each poly
saccharide that is present in the mixture being present in an
amount of 0.05 to 0.5 wt . % , based on a total weight of the
corrosion inhibitor composition , iii ) silver nanoparticles ,
and iv ) a pineapple leaves extract . A method of inhibiting
corrosion of metal during acid cleaning / pickling whereby
the metal is treated with an acidic treatment fluid containing
an acid and the corrosion inhibitor composition
Biopolymer Composites and Nanocomposites for Corrosion Protection of Industrial Metal Substrates
Corrosion is a critical problem that can be found in all industries worldwide. Corrosion is particularly
serious in the petroleum industry, due to the large amounts of metallic based assets located throughout
the entire supply chain. Annual costs of corrosion and its consequences are estimated to be 3 – 5 % of
GDP for developed countries of the world. Corrosion mitigation strategies adopted by some industries
include materials selection, coatings and linings, cathodic protection and the use of corrosion inhibitors
amongst others. The use of biopolymers for corrosion protection of industrial metal substrates
particularly as corrosion inhibitors has generated interest globally because they are considered as
environmentally friendly in addition to the possession of multiple adsorption centres. However, it is
found that most biopolymers studied function as moderate corrosion inhibitors. Some of the steps taken
to offset this drawback include copolymerization, addition of substances to exert synergistic action as
well as the incorporation of inorganic substances in nano-size into the biopolymer matrix in order to
improve the corrosion inhibition performances of the biopolymers. The application of biopolymer
composites and nanocomposites as anticorrosion materials has shown promising results and is believed
to form metal chelate which could block metal surfaces from aggressive ions present in corrosive media.
In this chapter, the application of composites and nanocomposites of biopolymers such as chitosan,
carboxyl methylcellulose, gum Arabic, Xanthan gum for corrosion protection of industrial metal
substrates in different corrosive media is discussed
METHOD FOR INHIBITING METAL CORROSION DURING ACID CLEANING OR PICKLING
A corrosion inhibitor composition , which includes i ) an
aqueous alcohol base fluid , ii ) a mixture of at least three
polysaccharides selected from carboxymethyl cellulose ,
gum arabic , pectin , a salt of alginic acid , chitosan , dextran ,
hydroxyethyl cellulose , and soluble starch , with each poly
saccharide that is present in the mixture being present in an
amount of 0.05 to 0.5 wt . % , based on a total weight of the
corrosion inhibitor composition , iii ) silver nanoparticles ,
and iv ) a pineapple leaves extract . A method of inhibiting
corrosion of metal during acid cleaning / pickling whereby
the metal is treated with an acidic treatment fluid containing
an acid and the corrosion inhibitor composition
An overview on the use of corrosion inhibitors for the corrosion control of Mg and its alloys in diverse media
The limiting factor towards the utilization of Mg and its alloys especially in aqueous
environment is their low corrosion resistance occasioned by their high chemical reactivity
and high electron negative potential. The corrosion inhibitor technology is one of the
effective corrosion mitigation approaches. In this review, inorganic, organic (surfactants,
ionic liquids, and Schiff bases), and polymeric substances reported as corrosion inhibitors
for Mg and its alloys are discussed. Smart coatings containing corrosion inhibitors for Mg
and its alloys are also highlighted. The drawbacks on current researches involving corrosion inhibitors for Mg and its alloys have been identified and the path to chart in
future researches in this area recommended
BIOMEDIATED - TITANIUM NANOCOMPOSITE FOR CORROSION PROTECTION
The present invention relates to a method of inhibiting
corrosion of steel in contact with a corrosive solution . The
method involves mixing an olive leaf extract titanium nano
composite with the corrosive solution . The olive leaf extract
titanium nanocomposite may be made by reducing TiC14
with an olive leaf extract , which forms nanoparticles with an
average size of 50-100 nm
Myristic acid based imidazoline derivative as effective corrosion inhibitor for steel in 15% HCl medium
There is a high demand of effective and eco-friendly corrosion inhibitor for industrial applications. In an
attempt to prepare a benign and effective corrosion inhibitor for acidizing purpose, an imidazoline
derivative, N-(2-(2-tridecyl-4,5-dihydro-1H-imidazol-1-yl)ethyl)tetradecanamide (NTETD) was synthesized
from myristic acid and diethyleneamine. The characterization of the newly synthesized compound
was done using 1H NMR, FTIR, and elemental analysis techniques. NTETD was examined as a corrosion
inhibitor for low carbon steel in 15% HCl solution using weight loss, electrochemical impedance spectroscopy
(EIS), potentiodynamic polarization (PDP), linear polarization (LPR), scanning electron microscope
(SEM), energy dispersive spectroscopy (EDAX), atomic force spectroscopy (AFM), and X-ray
photoelectron spectroscopy (XPS) techniques. It was found that, the optimum concentration of NTETD
is 300 mg/L. With this concentration, inhibition efficiency above 93% is achievable. Results from PDP
show that, NTETD acted as a mixed type corrosion inhibitor but with principal effect on cathodic corrosion
half reactions. The calculated value of the adsorption-desorption equilibrium constant (1.015 � 103)
reveals a strongThere is a high demand of effective and eco-friendly corrosion inhibitor for industrial applications. In an
attempt to prepare a benign and effective corrosion inhibitor for acidizing purpose, an imidazoline
derivative, N-(2-(2-tridecyl-4,5-dihydro-1H-imidazol-1-yl)ethyl)tetradecanamide (NTETD) was synthesized
from myristic acid and diethyleneamine. The characterization of the newly synthesized compound
was done using 1H NMR, FTIR, and elemental analysis techniques. NTETD was examined as a corrosion
inhibitor for low carbon steel in 15% HCl solution using weight loss, electrochemical impedance spectroscopy
(EIS), potentiodynamic polarization (PDP), linear polarization (LPR), scanning electron microscope
(SEM), energy dispersive spectroscopy (EDAX), atomic force spectroscopy (AFM), and X-ray
photoelectron spectroscopy (XPS) techniques. It was found that, the optimum concentration of NTETD
is 300 mg/L. With this concentration, inhibition efficiency above 93% is achievable. Results from PDP
show that, NTETD acted as a mixed type corrosion inhibitor but with principal effect on cathodic corrosion
half reactions. The calculated value of the adsorption-desorption equilibrium constant (1.015 � 103)
reveals a strong bonding between NTETD molecules and the steel surface. The EDAX, FTIR, and XPS results
confirm the adsorption of NTETD molecules on the steel surface. SEM and AFM results agree with experimental
findings that NTETD is effective in corrosion mitigation of steel in 15% HCl solution. The possible
corrosion inhibition mechanism by NTETD has been proposed. bonding between NTETD molecules and the steel surface. The EDAX, FTIR, and XPS results
confirm the adsorption of NTETD molecules on the steel surface. SEM and AFM results agree with experimental
findings that NTETD is effective in corrosion mitigation of steel in 15% HCl solution. The possible
corrosion inhibition mechanism by NTETD has been proposed
Corrosion Inhibition of Rumex vesicarius Mediated Chitosan-AgNPs Composite for C1018 CS in CO2-Saturated 3.5% NaCl Medium under Static and Hydrodynamic Conditions
Rumex vesicarius (RVE) mediated chitosan–AgNPs composite was produced in situ by
using an aqueous extract of Rumex vesicarius leaves as the reducing agent to reduce Ag+ to Ag0. The
synthesized composite was evaluated as a sweet (CO2) corrosion inhibitor (CI) for C1018 carbon steel
(CS) in 3.5 wt% NaCl solution under static and hydrodynamic conditions. The corrosion inhibitive
performance was evaluated using electrochemical impedance spectroscopy (EIS), linear polarization
resistance (LPR), and potentiodynamic polarization (PDP) techniques, as well as scanning electron
microscopy (SEM)/energy dispersive X-ray spectroscopy (EDAX), and atomic force microscopy
(AFM) on corroded C1018 CS without and with additives. The effect of concentration, immersion
time, temperature, and rotation speed on the CI performance of the composite was also investigated.
The corrosion inhibitive effect increased with increasing composite dosage, with the highest inhibition
efficiency (IE) acquired at the maximum composite dosage of 0.3%. Beyond this concentration, the
IE decline with increasing concentration. Furthermore, IE was found to increase with immersion
time and decline with a temperature rise from 25 to 40 �C, with the optimum temperature of 60 �C
found to accelerate corrosion without and with RVE-mediated Chi–AgNPs composite. Under high
shear stress, the Chi–AgNPs composite exhibits moderate corrosion inhibition under hydrodynamic
conditions. The surface analysis results validate the formation of a protective covering due to
composite adsorption on the CS surface. The RVE-mediated chitosan–AgNPs composite could be
recommended as a CI for C1018 CS in sweet (CO2) corrosion environments at ambient temperatur
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