Steel In Sulphuric Acid Medium Research Articles

Corrosion Inhibition Performances of Amino Acids Corrosion Inhibitors on Carbon Steel in Sulphuric Acid Medium

Abstract The amino acids have great potential in inhibiting metal corrosion. The corrosion inhibition performances of amino acids corrosion inhibitors on A3 carbon steel in sulphuric acid medium were investigated by weight loss method. The corrosion inhibition performances of the alanine, glycine, aspartate, arginine and methionine increase gradually with the dosage of amino acid corrosion inhibitor increase gradually. The five composite corrosion inhibitors were prepared by compound of the five amino acid and potassium iodide respectively to improve the corrosion inhibition performances of amino acids. The corrosion inhibition rate of the five composite corrosion inhibitors is about 20% higher than the amino acid corrosion inhibitors respectively. The amino acid and potassium iodide composite corrosion inhibitors have good protective effects on A3 carbon steel at 30-45°C. The amino acid and potassium iodide composite corrosion inhibitors used for sulfuric acid medium have good protective effects on A3 carbon steel.

Sodium salt of dodecyl benzene sulphonic acid as an effective corrosion inhibition for different heat-treated steel in sulphuric acid medium

Abstract The purpose of this work is to use electrochemical and gravimetric techniques to investigate the inhibition of DBSS on the corrosion of heat-treated dual-phase AISI 1040 steel in a 0.5 M sulphuric acid solution at 35 °C. The corrosion studies are performed by potentiodynamic polarization study (PDP), electrochemical impedance study (EIS), and gravimetric method. To confirm the inhibition surface characterization like x-ray diffraction technique (XRD) analysis, scanning electron microscopy (SEM), and EDS analysis are performed. Depending on the phase change of metals due to heat treatment, the corrosion inhibition of the heat-treated metal increased when it was exposed to 0.5 M H2SO4 at 35 °C in the presence of dodecyl benzene sulphonic acid sodium salt (DBSS) inhibitor. The highest inhibition efficiency of 63%, 82%, 87%, 43%, and 63% was obtained for AISI 1040 steel at heat treatment conditions of Normalized, Quenched at 700 °C, Quenched at 750 °C, Quenched at 790 °C and Quenched at 900 °C respectively. In the gravimetric and electrochemical study, the IE increases with the increase with the concentration of DBSS unto 75% from gravimetric analysis and 87% from PDP analysis for Quenched at 750 °C and 790 °C respectively. The metal protection is achieved by heat treatment process as well as by using DBSS as inhibitor. Corrosion inhibition on the metal’s surface was confirmed by SEM and XRD. In addition, the adsorption of DBSS on the anodic and cathodic sites of the metal surface was well explained.

The inhibitory properties of the boiling extracts from Malus sylvestris and Syringa vulgaris flowers on the corrosion of stainless steel in sulphuric acid medium

The inhibitory properties of the boiling extracts from Malus sylvestris and Syringa vulgaris flowers on the corrosion of stainless steel in sulphuric acid medium

Electrochemical and DFT studies of Terminalia bellerica fruit extract as an eco-friendly inhibitor for the corrosion of steel

It is well known that metal corrosion causes serious economy losses worldwide. One of the most effective ways to prevent corrosion is the continuous development of high-efficient and environment-friendly corrosion inhibitors. Among the widely used organic and inorganic corrosion inhibitors, plant extracts are top candidates due to their nontoxic nature. The present study reports a novel application of the methanolic extract of Terminalia bellerica fruits as an environment friendly corrosion inhibitor for steel in sulphuric acid medium. The phytochemicals of the extract, namely Ellagic, Gallic, and Malic acids, play a key role of the anti-corrosive behavior of the extract. The corrosion prevention activity was studied on the steel in 1 M H2SO4 using a variety of approaches including weight loss analysis (WL), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), density functional theory (DFT), natural bond orbital analysis (NBO), Fukui function and Monte Carlo simulations (MC). In 1 M H2SO4 solution, the maximum electrochemical inhibition efficiency of 91.79% was observed at 4000 mg/L concentration of the extract. The NBO analysis showed that the charge density of the double bonds and the oxygen atoms of carbonyl and hydroxyl groups of the phytochemicals lies on the top of the natural bond orbitals which promotes the anticorrosive properties of the investigated inhibitors. The surface coverage of steel was validated by SEM measurements. According to DFT studies, numerous nucleophilic regions were present in the active phytochemical constituents of the inhibitor, demonstrating their favorable nucleophilicity. The computed electronic structure of the phytochemicals revealed band gaps of 4.813, 5.444, and 7.562 eV for Ellagic, Gallic, and Malic acids respectively suggesting effective metal-inhibitor interactions. A good correlation between experimental and theoretical findings was addressed.

An investigation on corrosion inhibition efficacy of benzodiazepines on mild steel in acid medium

Corrosion inhibition efficacy of the synthesized benzodiazepines namely Dimethyl-[4-(4-phenyl-2,3-dihydro-1H-benzo[b][1,4]diazepin-2-yl)-phenyl]-amine (DPBD) and Dimethyl-[4-(4-methyl-2,3-dihydro-1H-benzo[b][1,4]diazepin-2-yl)-phenyl]-amine (DMBD) on commercially available mild steel in sulphuric acid medium was investigated by Electrochemical and Weight loss studies. From the results, it has been affirmed that DPBD is effective in combating corrosion, exhibiting maximum inhibition efficacy of 86% at 100 ppm at 303 K. The adsorption efficacy of DPBD and DMBD over the metallic surface was identified to comply with the Langmuir adsorption isotherm model. The development of a protective layer on the surface of the mild steel was confirmed by the Scanning Electron Microscopic studies (SEM).

Hexamine as anti-pit agent for mild steel in sulphuric acid medium

Hexamine as anti-pit agent for mild steel in sulphuric acid medium

Corrosion Inhibition of Rosemary Oil on High Carbon Steel in Sulphuric Acid Medium

Rosemary oil was investigated on carbon steel in 0.5M sulphuric acid through weight loss technique. It was observed that weight loss, inhibitor efficiency and corrosion rate differ in concentration of the oil and exposure time. Maximum inhibitor efficiency of 78.45% was obtained at 10ml concentration of the oil. The performance of the oil was associated with the existence of organic compounds such as alkaloids, flavonoids, tannins, among others which form a protective film and act as a barrier against corrosion attack in sulphuric acid environment.

In depth analysis of anti corrosion behaviour of eco friendly gum exudate for mild steel in sulphuric acid medium

The current research work was keen to examine the corrosion inhibition efficiency of mild steel (MS) in presence of aqueous extract of Araucaria heterophylla Gum (AHG) in 1 M H2SO4 medium. The phytoconstituents of the AHG were interpreted by GC-MS and corrosion inhibition efficiency was deduced using other techniques like weight loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS). Adsorption of inhibitor molecules on the mild steel surface was supported by Density Functional Theory (DFT) studies, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). It is seen from the results that the inhibitor exhibits optimum efficiency of 78.57% at 0.05% v/v on mild steel specimen in 1 M H2SO4 medium at room temperature. Tafel polarizations clearly show that the aqueous extract of AHG acts as a mixed type inhibitor. The change in the EIS parameters in presence of inhibitor is investigative of the protective layer formation of the mild steel surface. The adsorption is found to obey Langmuir adsorption isotherm. Thermodynamic and activation parameters for the corrosion inhibition process supported the physical adsorption mechanism.

Corrosion studies of mild steel in sulphuric acid medium by acidimetric method

Corrosion studies of mild steel in sulphuric acid medium by acidimetric method

Enhanced corrosion resistance of mild steel in sulphuric acid medium by imidazole derivative: Experimental and computational studies

Abstract The inhibition action of the imidazole derivative on the corrosion of mild steel in 0.5 M Sulphuric acid was investigated by weight loss, polarization, Impedance and SEM. The PZC of mild steel was studied by AC impedance method. The polarization experiment revealed that IDZ is of mixed–type but slightly anodic control. Weight loss results obtained revealed that the imidazoline derivatives performed excellently as corrosion inhibitor with efficiency above 70% at 20ppm at 303 K. The optimum period of inhibition for IDZ was determined by weight loss studies. Its adsorption on mild steel obeys Tempkin isotherm. Quantum chemical parameters and Mulliken charge densities on the optimized structure of imidazoline derivative were calculated using GAUSSIAN 09 with B3LYP / 6-31G (d,p) basis set

Investigation of Mentha spicata extract as Green Corrosion Inhibitor for Mild Steel in 2M Sulphuric Acid Medium

The Mentha spicata plant extract was tested as a corrosion inhibitor for mild steel in 2M H2SO4 solution by weight loss and thermometric methods. It has been found that the extract acts as an effective corrosion inhibitor for mild steel in Sulphuric acid medium. The inhibition process is attributed to the formation of an adsorbed film of inhibitor on the metal surface which protects the metal against corrosion. The inhibition efficiency (%IE) and Surface coverage (?) of M. spicata extract increased with increase in inhibitor concentration but decreased with increasing the temperature. The adsorption of plant extract constituents on the mild steel surface was discussed by Langmuir’s adsorption isotherm. The free energy value (?Gads), indicated that the adsorption of inhibitor molecules was physisorption. The surface morphology of metal plate was analyzed using scanning electron microscopy which showed the formation of protective layer on the mild steel surface. The results obtained show that M. spicata extract can be employed as an excellent corrosion inhibitor with good anticorrosion properties in 2M Sulphuric acid for mild steel.

Synergistic Influence of Halide Ions on Corrosion Inhibition Performance of Gum Exudates of Azadirachta indica on Carbon Steel in Sulphuric Acid Medium

Synergistic Influence of Halide Ions on Corrosion Inhibition Performance of Gum Exudates of Azadirachta indica on Carbon Steel in Sulphuric Acid Medium

On the role of the electronic states of corrosion inhibitors: Quantum chemical-electrochemical correlation study on urea derivatives

A correlation study is addressed between quantum chemical parameters of five electronic states using Density Functional Theory (DFT) of Urea (U), Thiourea (TU), Selenourea (SU) and Guandine (GU) with the experimentally measured protection efficiency (%P) for the corrosion of low carbon steel in sulphuric acid medium. The best correlation is found for the ground electronic state (S0) of SU followed by TU, U and GU. The results indicate that the chemical model based on bonding between inhibitor and metal is more consistent than the physical model based on electrostatic attraction between heteroatoms and metal.

Synthesis and corrosion inhibition study of benzodiazepines on mild steel in sulphuric acid medium

Abstract 2,4-diphenyl-2,3-dihydro-1H-1,5-benzodiazepine (DPBD) and 4-phenyl-2-(2-ethoxy-3-hydroxyphenyl)-2,3-dihydro-1H-1,5-benzodiazepine (EPBD) were synthesized by the condensation of o-phenylenediamine and chalcone catalyzed by sulphated zirconia and characterized by FTIR spectra. Corrosion inhibition property of the benzodiazepines on mild steel in sulphuric acid medium was investigated by mass loss and electrochemical methods. The Compound EPBD showed better corrosion protection properties than DPBD both at room temperature and at higher temperatures. The results showed that the compounds act as good inhibitor and the efficiency increased with increase in their concentration. The adsorption of the inhibitors on the surface of mild steel was found to obey Langmuir adsorption isotherm. SEM study showed the formation of a protective adsorptive film of the inhibitor on mild steel surface.

N-((4-CHLOROPHENYL)(MORPHOLIN-4-YL)METHYL)BENZAMIDE as corrosion inhibitor for mild steel in Sulphuric acid medium

The inhibiting effect and adsorption behavior of N-[(4-chlorophenyl)(morpholin-4-yl)methyl]benzamide (CPMB) on mild steel in sulphuric acid solution were studied by weight loss measurements, effect of temperature studies, potentiodynamic polarization and scanning electron microscopic techniques. The inhibitor showed greater than 90 % inhibition efficiency at 0.01 M. Potentiodynamic polarization studies showed that the inhibition action is concentration dependent, at low concentration anodic, higher concentration cathodic, inhibition predominant. The adsorption process of CPMB at the mild steel/sulphuric acid solution interface is described by Temkin’s adsorption isotherm model. The negative value of standard free energy of adsorption in the presence of inhibitor suggests spontaneous adsorption of CPMB molecule on the mild steel surface. The protective film formation against the acid attack is confirmed by SEM.

Benzodimidazole and Imidazole as Corrosion Inhibitors of AISI 316L Stainless Steel in Sulphuric Acid Medium

The corrosion behaviour of AISI 316L stainless steel in 0.5 M H2SO4 solution containing various concentrations of dimethyl benzodimidazole (BZD) as corrosion inhibitor was investigated. Inhibition efficiency was evaluated using potentiodynamic polarization and electrochemical impedance techniques. 40 ppm of BZD showed the best behaviour at 25 °C, above this concentration the efficiency was decrease. All results were compared with imidazole as inhibitor as same conditions, founded a similar performance at 40 ppm. Both inhibitors showed absorptions on the stainless steel surface which obeyed the Frumklin isotherm adsorption equation.

Corrosion Inhibition of Steel by Various Parts of Rotula Aquatica Plant Extracts in H2SO4 Solutions

The corrosion inhibition and adsorption of ethanol extracts of leaves (LV), stems (ST) and roots (RT) of Rotula aquatica plant for mild steel in H 2SO 4 solutions were investigated using conventional weight loss, gasometric techniques, electrochemical polarizations and electrochemical impedance spectroscopy. The results showed that all the three extracts of Rotula aquatica plant performed well as inhibitor for the corrosion of steel in sulphuric acid media and the inhibition efficiencies of the extract follow the trend RT > LV > ST. Inhibition efficiencies increased with increasing concentration of the plant extracts but decreased with the temperature rise for all cases. Both the cathodic hydrogen evolution and the anodic dissolution of mild steel were inhibited, hence the active molecules of all the extracts studied acted as mixed type corrosion inhibitors.

Effect of Condensation Product of Thiosemicarbazide and Phenyl Isothiocynate on Corrosion of Mild Steel in Sulphuric Acid Medium

Effect of Condensation Product of Thiosemicarbazide and Phenyl Isothiocynate on Corrosion of Mild Steel in Sulphuric Acid Medium

Effect of Launaea Resedifolia Aqueous Extract as Eco-Friendly Inhibitor on the Corrosion of Steel in Sulphuric Acid Medium

The anticorrosive effect of the aqueous extract of Launaea resedifolia on the corrosion of carbon steel X52 in 1.0 M H2SO4 solution was investigated electrochemically, and by weight loss experiments at room temperature. The percentage inhibition increased with the increase of the inhibitor concentration. The studies reveal that the plant extract act as a good inhibitor. Tafel polarization method indicated that the plant extract behaves as mixed mode inhibitor. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the metal surface.

Theoretical Studies on Phenazine and Related Compounds as Corrosion Inhibitors for Mild Steel in Sulphuric Acid Medium

Theoretical Studies on Phenazine and Related Compounds as Corrosion Inhibitors for Mild Steel in Sulphuric Acid Medium