Asian Journal of Research in Chemistry

C. Thangavelu ¹, P. Patric Raymond ², S. Rajendran ³, M. Sundaravadivelu ⁴

Affiliations
1 Department of Chemistry, Periyar E.V.R. College, Trichirappalli, 620023, Tamilnadu, IN
2 St.Joseph’s College, Trichirappalli, 620002, Tamilnadu, IN
3 Servite College of Education, Thogaimalai, Tamilnadu, IN
4 Gandhigram Rural Institute, Tamilnadu, IN

Abstract

Generally phosphates, chromates, nitrites and zinc ions are used as inhibitors in the older days. In order to reduce the usage of these hazardous substances, now a days phosphonates are used as green inhibitors for sustainability of potable water. The need of the hour is to develop formulations free from hazardous materials used in potable water system. In our studies, we developed the formulation which acts as eco - friendly inhibitor.

Keywords

Potable Water, Carbon Steel, Green Inhibitor, Corrosion.

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H. BenitaSherine ¹, A. Jency Angela ¹, S. Rajendran ²

Affiliations
1 Department of Chemistry, Holy Cross College, Tiruchirappalli – 620 002, Tamilnadu, IN
2 Department of Chemistry, GTN Arts College, Dindigul – 624 005, Tamilnadu, IN

Abstract

The inhibition efficiencies of inhibitor systems constituting various combinations of o-nitrophenol (ONP) and zinc ions in controlling corrosion of carbon steel immersed in ground water for seven days had been evaluated by weight loss method. The nature of the protective film formed on the metal surface has been analysed by FTIR spectra. The protective film was found to consist of Fe²⁺ - ONP complex. Synergism parameters and Analysis of variance (ANOVA) had been used to evaluate the synergistic effect existing between various inhibitors.

Keywords

Carbon Steel, Corrosion Inhibition, O-nitro Phenol, F-test, Synergistic Effect.

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C. Thangavelu ¹, P. Patric Raymond ², S. Rajendran ³, M. Sundaravadivelu ⁴

Affiliations
1 Periyar E. V. R. College, Trichirappalli, 620023, Tamilnadu, IN
2 St. Joseph’s College, Trichirappalli, 620002, Tamilnadu, IN
3 Servite College of Education Thogaimalai, Tamilnadu, IN
4 Gandhigram Rural Institute, Tamilnadu, IN

Abstract

Corrosion rates of carbon steel immersed in various concentrations of Cl^- (100 ppm and 150 ppm) have been evaluated by weight loss method in the absence and presence of Amino (trimethylene phosphonic acid) ATMP and Zn²⁺. It is found that ATMP alone is corrosive at 100 ppm Cl^- but at 150 ppm Cl^- it shows some inhibition efficiency (IE) due to deposition of Cl^- on metal surface. However interestingly, ATMP shows very good IE in the presence of Zn²⁺ at all concentrations of Cl^-. A synergistic effect is noticed between ATMP and Zn²⁺. The protective film has been analysed by surface analysis techniques and a suitable mechanism of corrosion inhibition is proposed.

Keywords

Carbon Steel, Corrosion Inhibition, Chloride Environment, Phosphonic Acid.

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K. Juliet Gnana Sundari ¹, C. Joseph Kennady ¹, S. Rajendran ²

Affiliations
1 Department of Chemistry, Karunya University, Tamil Nadu, IN
2 G. T. N. Arts College, Dindigul, Tamil Nadu, IN

Abstract

Zinc alloy coatings are considered as good substitutes for cadmium coating because cadmium is toxic in nature. Electrodeposition of Zinc-nickel alloy on mild steel is carried out from the electrolytic bath solution containing zinc oxide, sodium hydroxide and Nickel sulphate with EDTA as complexing agent. Plating process parameters such us current density, temperature and bath composition are optimized using galvanostatic electrolysis. The deposit obtained is uniform and semi bright. Zinc-nickel alloy is also electrodeposited from the bath solution containing various concentration of benzaldehyde. The deposits are uniform and bright the composition of nickel in the electrodeposits is studied by atomic absorption spectroscopy. Surface morphology of the deposit is studied by scanning electron microscopy and thickness of the deposit is determined by x-ray diffraction studies. Corrosion resistance measurement is done by tafel and impedance studies. It is observed that current efficiency and corrosion resistance of the zinc nickel alloy deposited specimen with benzaldehyde are greater than the deposited specimen without benzaldehyde.

Keywords

Zinc-Nickel Alloy, EDTA, Electrodeposition, Corrosion Study.

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V. Dharmalingam ¹, P. Arockia Sahayaraj ¹, A. John Amalraj ¹, A. Angelin Prema ², S. Rajendran ³

Affiliations
1 PG and Research Department of Chemistry, Periyar E.V.R College (Autonomous), Tiruchirappalli-620023, Tamil Nadu, IN
2 PG and Research Department of Physics, Periyar E.V.R College (Autonomous), Tiruchirappalli-620023, Tamil Nadu, IN
3 RVS School of Engineering and Technology, Dindigul-624005, Tamil Nadu, IN

Abstract

Inhibition of mild steel corrosion in 60 ppm chloride medium by Polyacrylic acid (PAA), Trisodium citrate (TSC) and Zn²⁺ ions was investigated by weight loss measurement, potentiodynamic polarization, electrochemical impedance studies (EIS), Fourier transform infrared spectroscopy (FT-IR), Scanning electron spectroscopy (SEM), Energy dispersive X-Ray spectroscopy (EDS) and Atomic force microscopy (AFM). The results indicated that the TSC acts as an optimum in the inhibition efficiency (95%) is observed for a concentration close to 100 ppm, addition to increase in TSC concentration decrease the inhibition efficiency. 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 (FT-IR, SEM, EDS and AFM) are also used to ascertain the nature of the protective film. The mechanical aspect of corrosion inhibition is proposed.

Keywords

Polyacrylic Acid, Mild Steel, Polarization, EIS, FT-IR, SEM, EDS, AFM.

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