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