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ABSTRACT: Schiff base N-[(2-chloroquinolin-3-yl) methylidene ]-2-methylaniline (CQM) was synthesized, and its inhibitive effect for mild steel in 1M HCl solution was investigated by weight loss measurement and electrochemical tests. From the weight loss measurements and electrochemical tests, it was observed that the inhibition efficiency increases with the increase in the Schiff base concentration and reaches a maximum at the optimum concentration. This is further confirmed by the decrease in corrosion rate. It is found that the system follows Langmuir adsorption isotherm. INTRODUCTION Acid solutions are widely used for the removal of undesirable scale and rust in many industrial processes. Aqueous acid solutions are amongst the most corrosive media known. The corrosion of metals in acid solutions can be inhibited by many organic compounds, particularly those containing hetero atoms like Nitrogen, Phosphorus, oxygen and sulphur.1,2 Organic inhibitors generally protect the metal from corrosion by forming a film on the metal surface. The effectiveness is related to chemical composition, their molecular structure, and their affinities for the metal surface. The addition of corrosion inhibitors effectively protects the metal against an acid attack. Inhibitors are used in these processes to control metal dissolution3.Schiff base compounds are the condensation product of an amine and a ketone/aldehyde.Schiff base inhibitors have been reported as corrosion inhibitors for steel, copper and aluminium.4-7 The adsorbed species protect the metal from corrosion. Adsorption depends on not only on the nature and charge of the metal but on the chemical structure of the inhibitor. The efficiency of Schiff's bases is much higher than that of corresponding aldehyde and amines, and this may be due to the presence of a >C=Ngroup in the molecules. The planarity (p) and lone pairs of electrons present on N atoms are important structural features that determine the adsorption of Schiff's base molecules on a metal surface. The aim of the present investigation was to synthesize and evaluate a novel Schiff base, CQM's performance as acid corrosion inhibitor for mild steel in 1M HCl by weight loss, polarization and electrochemical impedance spectroscopy. EXPERIMENTAL Materials Mild Steel (MS) specimens having a composition of 0.09 % P, 0.37 % Si, 0.01 % Al, 0.05 % Mn, 0.19 % C, 0.06 % S and the remainder Fe, were used for electrochemical polarization and impedance measurements. Specimens of 1 cm × 1 cm area were polished with emery paper Number 120- 1000, degreased with acetone, washed with double distilled water and finally, dried at room temperature before immersing in acid solution. The acid solutions were made from analytical grade 37% HCl and doubledistilled water. A Schiff base compound CQM with a structural formula as shown in Figure1 was synthesized by stirring a mixture of 2-chloro-quinoline-3-carbaldehyde (0.005 mol) and methylaniline (0.005 mol) in ethanol with a catalytic amount of sulfuric acid and refluxed for 6-7 hrs. After the reaction was complete, the reaction mixture was poured onto crushed ice; the solid mass thus separated out was filtered, washed with distilled water and dried.
- Well Completion > Well Integrity > Subsurface corrosion (tubing, casing, completion equipment, conductor) (1.00)
- Production and Well Operations > Production Chemistry, Metallurgy and Biology > Corrosion inhibition and management (including H2S and CO2) (1.00)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Materials and corrosion (1.00)
Corrosion Inhibition Of Mild Steel In Acidic Media Using A Nanomagnetic Fluid As A Novel Corrosion Inhibitor
Jauhari, Smita (Applied Chemistry Department Sardar Vallabhbhai National Institute of Technology) | Parekh, Kinnari (Department of Physics Indian Institute of Technology) | Upadhyay, R.V. (Institute of Applied Sciences)
ABSTRACT: Nanomagnetic fluid, a novel material comprising of ferromagnetic nanoparticles, has been evaluated as a corrosion inhibitor. Corrosion behavior of carbon steel in 0.1M HNO3 has been studied as a function of various concentrations of aqueous nanomagnetic fluid. The novel nanomagnetic fluid has been specially synthesized to achieve the stability in acidic media when it is mixed with HNO3 This nanomagnetic fluid has been evaluated by gravimetric and polarization measurement techniques. It was observed that the inhibition efficiency increases with the increase in the nanomagnetic fluid concentration and reaches the maximum at the optimum concentration. This is further confirmed by the decrease in the corrosion rate. It is found that the system follows Temkin adsorption isotherm. INTRODUCTION Acid Solution are widely used in industry the most important areas of application are acid pickling, acid cleaning, descaling and oil well cleaning.1 Corrosion inhibitors are needed to reduce the corrosion rates of metallic materials in these media. Nanostructure materials are establishing themselves as the modern generation of high-performance materials in many areas, ranging from automotive engineering to bioengineering. Advancements in modern engineering and technology have hastened the development of high-performance corrosionresistant coatings, which have a broad spectrum of effectiveness under a wider range of aggressive environments. Carbon steel finds wide application as a construction material for heat transport systems in nuclear, petrochemical, and chemical process industries. However, this material is highly prone to corrosion in acidic environments. The applicability of organic compounds as corrosion inhibitors for the metals in acidic medium has been recognized for a long time.2-8 Here, we introduce a nanomagnetic fluid or a ferrofluid, as a novel material comprising of ferromagnetic nanoparticles, as a corrosion inhibitor. Magnetic fluids or ferrofluids consist of a myriad of ferromagnetic particles coated with dispersant and suspended in a carrier fluid. These magnetic particles can be magnetized and range in size from 3 to 15 nanometers.9 The suspension is stable, as the dispersant prevents particle agglomeration, and Brownian motion keeps the particles suspended in the carrier fluid. The behavior of a ferrofluid depends on the presence or absence of a magnetic field, and accordingly, the fluid can be used for various applications in engineering and bio-medical fields.10,11 Corrosion behavior of carbon steel in 0.1M HNO3 has been studied as a function of concentration of an aqueous ferrofluid. A ferrofluid, which remains stable in acidic environments, is specially designed and synthesized in this study. The results are evaluated by gravimetric, impedance and potentiodynamic polarization techniques. EXPERIMENTAL Synthesis of Ferrofluid The chemical co-precipitation technique is used to synthesize Fe3O4 nanoparticles.12 Analytical grade reagents of ferrous chlorides and ferric chloride were used to prepare a solution containing Fe2+ and Fe3+ ions at a molar ratio of 1:2. The salt solution was mixed with an 8M NH4OH at 30 °C under constant stirring at pH 10.5 for 20 min. The pH of the precipitate was adjusted to 5 with the addition of acetic acid before proceeding to the next step (coating with citrate ion).
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.34)