scholarly journals Impervious Nature of Al2O3-PANI Composite Against Corrosion on Mild Steel in Strong Acidic Environment

2018 ◽  
Vol 34 (4) ◽  
pp. 1832-1841 ◽  
Author(s):  
P. Kamatchi Selvaraj ◽  
S. Sivakumar ◽  
S. Selvaraj
Keyword(s):  
Mild Steel ◽  
Sodium Salt ◽  
Potentiodynamic Polarization ◽  
Oxidative Polymerization ◽  
Gravimetric Method ◽  
Water Soluble ◽  
Continuous Exposure ◽  
Acidic Environment ◽  
Pani Composite ◽  
Prepared Composite

Solubility problem of composite in aqueous medium is resolved on adding Al2O3 during the oxidative polymerization of aniline using ammonium peroxydisulphate as an oxidant and sodium salt of dodecyl bezenesulphonic acid as surfactant and dopant at 273 K temperature. The yielded water soluble Al2O3-PANI composite is confirmed by comparing the FTIR, XRD and SEM recorded spectra with previously reported one. Gravimetric method exposes that the prepared composite is having confrontation against corrosion. Only a slight change in efficiency on continuous exposure up to eight hours is observed. OCP data are transformed in to potential graph to exposes the invincibility of the composite against corrosion. Measurement of potentiodynamic polarization and EIS studies also confirms the defiance against corrosion.

scholarly journals Benzylidene as Efficient Corrosion Inhibition of Mild Steel in Acidic Solution

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 27
Author(s):  
Shaimaa B. Al-Bghdadi ◽  
Mahdi M. Hanoon ◽  
Jafer F. Odah ◽  
Lina M. Shaker ◽  
Ahmed A. Al-Amiery
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Steel Corrosion ◽  
Solution Temperature ◽  
Acidic Environment ◽  
Mild Steel Corrosion ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Steel Coupon

A New benzylidene derivative namely benzylidene-5-phenyl-1,3,4-thiadiazol-2-amine (BPTA), was successfully synthesized and characterized using Fourier Transform Infrared Spectroscopy, Nuclear Magnetic Resonance and elemental analysis (CHN) techniques. The inhibition efficiency of BPTA on mild steel corrosion in 1.0 N HCl was tested at various temperatures. The methodological work was achieved by gravimetric method complemented with morphological investigation. The concentrations of inhibitor were 0.1, 0.2, 0.3, 0.4 and 0.5 mM at the temperatures 303, 313, 323 and 333 K. The BPTA, molecules as become superior corrosion inhibitor with 92% inhibition efficiency of mild steel coupon in the acidic environment. The inhibition efficiency increased with increasing concentrations of BPTA and the excellent efficiency was performed with the 0.5 mM concentration and followed with 0.4 mM. In acidic environment, the 0.5 and 0.4 mM gave the optimum performance with weight loss technique and scanning electron microscopy analysis. On the other hand, the inhibition efficiency decreased with the increase of temperature. Results of BPTA indicated mixed type inhibitor and the adsorption on the mild steels surface obeys the Langmuir adsorption isotherm. It was found that the BPTA performance depend on the concentration and the solution temperature. Quantum chemical calculations have been done to correlate the electronic characteristics of BPTA with the corrosive inhibitive impact. Experimental and theoretical results are in good agreement.

Adsorption and corrosion inhibition characteristics of two medicinal molecules

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Half Life ◽  
Thermodynamic Data ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Corrosive Environment ◽  
Corrosion Inhibition Efficiency

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

Highly Conjugated, Water-Soluble Polymers via the Direct Oxidative Polymerization of Monosubstituted Bithiophenes

1998 ◽  
Vol 31 (3) ◽  
pp. 933-936 ◽  
Author(s):  
Seth C. Rasmussen ◽  
Jason C. Pickens ◽  
James E. Hutchison
Keyword(s):  
Oxidative Polymerization ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers

scholarly journals Synthesis of Water-Soluble 7-O-Carboxymethyl-Genistein

2017 ◽  
Vol 41 (3) ◽  
pp. 183-185
Author(s):  
Zhiling Cao ◽  
Qiao Wu ◽  
Jing Cheng ◽  
Dandan Zhu ◽  
Wengqi Teng ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Sodium Salt ◽  
Water Solubility ◽  
Clinical Chemistry ◽  
Water Soluble ◽  
Aqueous Acetic Acid ◽  
Carboxylate Group ◽  
Target Compound ◽  
Catalysed Reaction

A three-step synthesis from genistein of the water-soluble sodium salt of 7-O-carboxymethyl-genistein is described. Base-catalysed reaction of genistein with t-butyl bromoacetate gave 7-O-(carbo-t-butoxy)methyl-genistein, which was hydrolysed by aqueous acetic acid to 7-O-carboxymethyl-genistein and neutralised (NaHCO3) to give the target compound. The carboxylate group enhanced the water-solubility of genistein more than a thousand-fold and the new derivate will be useful as a candidate compound in pharmacological and clinical chemistry studies of isoflavones.

scholarly journals Calcium D-Pantothenate as Green Corrosion Inhibitor on Mild Steel in 240 ppm NaCl Solution

2019 ◽  
Vol 9 (2S2) ◽  
pp. 435-442
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Density Functional ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Nacl Solution ◽  
Functional Theory ◽  
Vitamin B5 ◽  
Quantum Chemical Data

Corrosion inhibition of mild steel in 240 ppm NaCl solution using Calcium D-Pantothenate (Vitamin B5 ) as corrosion inhibitor is studied using electrochemical impedance, potentiodynamic polarization and weight loss studies. From the potentiodynamic polarization studies, icorr (corrosion current density) decreases with increasing the concentration of vitamin B5 (VB5 ). The CR (corrosion rate) decreases and the IE (inhibition efficiency) of VB5 increases on increasing the concentration of VB5 .Surface investigation using SEM, EDX spectra, UV-Vis, FTIR, electrochemical impedance, potentiodynamic polarization and adsorption isotherm parameter of VB5 in 240 ppm NaCl solution shows that VB5 can act asworthy corrosion inhibitors. Quantum chemical data obtained from density functional theory (DFT) calculations also agreed with the experimental outcomes.

scholarly journals The Corrosion Inhibition Performance of Polyacrylic Acid with Potassium Sodium Tartrate and Zn2+ for Corrosion Control of Mild Steel in Aqueous Solution

2015 ◽  
Vol 61 ◽  
pp. 137-148 ◽  
Author(s):  
V. Dharmalingam ◽  
P. Arockia Sahayaraj ◽  
A. John Amalraj ◽  
R. Shobana ◽  
R. Mohan
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Polyacrylic Acid ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
Aqueous Environment ◽  
Protective Film ◽  
Sodium Tartrate ◽  
Potassium Sodium ◽  
Potassium Sodium Tartrate

The goal of studying corrosion process is to find means of minimizing corrosion or prevent it from occurring. The use of inhibitors is one of the most popular methods for corrosion protection. A protective film has been formed on the surface of the mild steel in a neutral aqueous environment using a synergistic mixture of an eco-friendly inhibitor viz., Potassium Sodium Tartrate (SPT) along with polyacrylic acid (PAA) and Zn2+ ions. The inhibiting effect of SPT, PAA and Zn2+ ions have been investigated by gravimetric studies, Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The investigations revealed that SPT acts as an excellent synergist in corrosion inhibition. Optimum concentrations of all the three components of the ternary formulation are established by gravimetric studies. Potentiodynamic polarization studies inferred that this mixture functions as a cathodic inhibitor. EIS studies of the metal/solution interface indicated that the surface film is highly protective against the corrosion of mild steel. Surface characterization techniques (FTIR, SEM, AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.

scholarly journals Protection of Mild Steel Corrosion in Sulphuric Acid Environment Using Wheat Starch

2017 ◽  
Vol 10 ◽  
pp. 11-21 ◽  
Author(s):  
Simeon C. Nwanonenyi ◽  
Okoro Ogbobe ◽  
Emeka Emmanuel Oguzie
Keyword(s):  
Mild Steel ◽  
Metal Surface ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Measurement Techniques ◽  
Steel Corrosion ◽  
Polarization Measurement ◽  
Wheat Starch ◽  
Adsorption Parameters ◽  
Acid Environment

The corrosion of mild steel in 0.5 M H2SO4acid solution and the inhibition process by wheat starch (WS) was investigated using weight loss and potentiodynamic polarization measurement techniques respectively. Gravimetric results revealed that there is significant reduction in the corrosion rate of mild steel in the presence of inhibited solution compared to blank solution, and also the inhibition efficiency was found to depend on the concentration of the WS. Data on potentiodynamic polarization results confirmed that WS exhibited mixed type inhibition behaviour, though the cathodic effect was more pronounced. The mode of WS adsorption on the corroding metal surface followed Langmuir isotherm model. In addition, the trend of inhibition efficiency with temperature, activation energy and heat of adsorption parameters revealed a strong interaction between the WS constituents and the corroding metal surface, thus indicating that WS lowered the corrosion process by blanketing the mild steel surface through chemical adsorption mechanism. The mechanism of inhibition was discussed in the light of the chemical structure of starch.

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