Protection of 6061 Al-15%(v) SiC(P) composite from corrosion by a biopolymer and surface morphology studies

B. P. Charitha, Padmalatha Rao

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The protective action of biopolymer starch on 6061 Al-15%(v) SiC(P) composite in 0.25 M hydrochloric acid was studied by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques with temperature ranging from 303 to 323 K. The concentrations of starch used were in the range of 0.1 to 0.8 g L–1. The surface morphology studies were carried out using Scanning Electron Microscope, Energy Dispersive X-ray analysis, Atomic Force Microscope and X-ray Diffraction analysis techniques. Suitable mechanism was proposed for the corrosion and inhibition process. Results indicated increase in the efficiency of the inhibitor with its increase in the concentration and with temperature. Maximum inhibition efficiency of 84% was observed at 323 K for 0.8 g L–1. Starch acted as a mixed inhibitor. Kinetic and thermodynamic studies showed that starch underwent chemical adsorption and obeyed Langmuir adsorption isotherm. Surface morphology studies confirmed the adsorption of inhibitor on the surface of metal matrix composite. Results obtained by potentiodynamic polarization method and electrochemical impedance spectroscopy method were in good agreement with one another.

Original languageEnglish
Pages (from-to)704-713
Number of pages10
JournalProtection of Metals and Physical Chemistry of Surfaces
Volume52
Issue number4
DOIs
Publication statusPublished - 01-07-2016

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Biopolymers
Starch
Surface morphology
Corrosion
Potentiodynamic polarization
Composite materials
Electrochemical impedance spectroscopy
Adsorption
Hydrochloric Acid
Energy dispersive X ray analysis
Corrosion inhibitors
Hydrochloric acid
Adsorption isotherms
X ray diffraction analysis
Microscopes
Electron microscopes
Metals
Thermodynamics
Scanning
Temperature

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Protection of 6061 Al-15{\%}(v) SiC(P) composite from corrosion by a biopolymer and surface morphology studies",
abstract = "The protective action of biopolymer starch on 6061 Al-15{\%}(v) SiC(P) composite in 0.25 M hydrochloric acid was studied by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques with temperature ranging from 303 to 323 K. The concentrations of starch used were in the range of 0.1 to 0.8 g L–1. The surface morphology studies were carried out using Scanning Electron Microscope, Energy Dispersive X-ray analysis, Atomic Force Microscope and X-ray Diffraction analysis techniques. Suitable mechanism was proposed for the corrosion and inhibition process. Results indicated increase in the efficiency of the inhibitor with its increase in the concentration and with temperature. Maximum inhibition efficiency of 84{\%} was observed at 323 K for 0.8 g L–1. Starch acted as a mixed inhibitor. Kinetic and thermodynamic studies showed that starch underwent chemical adsorption and obeyed Langmuir adsorption isotherm. Surface morphology studies confirmed the adsorption of inhibitor on the surface of metal matrix composite. Results obtained by potentiodynamic polarization method and electrochemical impedance spectroscopy method were in good agreement with one another.",
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AU - Charitha, B. P.

AU - Rao, Padmalatha

PY - 2016/7/1

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N2 - The protective action of biopolymer starch on 6061 Al-15%(v) SiC(P) composite in 0.25 M hydrochloric acid was studied by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques with temperature ranging from 303 to 323 K. The concentrations of starch used were in the range of 0.1 to 0.8 g L–1. The surface morphology studies were carried out using Scanning Electron Microscope, Energy Dispersive X-ray analysis, Atomic Force Microscope and X-ray Diffraction analysis techniques. Suitable mechanism was proposed for the corrosion and inhibition process. Results indicated increase in the efficiency of the inhibitor with its increase in the concentration and with temperature. Maximum inhibition efficiency of 84% was observed at 323 K for 0.8 g L–1. Starch acted as a mixed inhibitor. Kinetic and thermodynamic studies showed that starch underwent chemical adsorption and obeyed Langmuir adsorption isotherm. Surface morphology studies confirmed the adsorption of inhibitor on the surface of metal matrix composite. Results obtained by potentiodynamic polarization method and electrochemical impedance spectroscopy method were in good agreement with one another.

AB - The protective action of biopolymer starch on 6061 Al-15%(v) SiC(P) composite in 0.25 M hydrochloric acid was studied by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques with temperature ranging from 303 to 323 K. The concentrations of starch used were in the range of 0.1 to 0.8 g L–1. The surface morphology studies were carried out using Scanning Electron Microscope, Energy Dispersive X-ray analysis, Atomic Force Microscope and X-ray Diffraction analysis techniques. Suitable mechanism was proposed for the corrosion and inhibition process. Results indicated increase in the efficiency of the inhibitor with its increase in the concentration and with temperature. Maximum inhibition efficiency of 84% was observed at 323 K for 0.8 g L–1. Starch acted as a mixed inhibitor. Kinetic and thermodynamic studies showed that starch underwent chemical adsorption and obeyed Langmuir adsorption isotherm. Surface morphology studies confirmed the adsorption of inhibitor on the surface of metal matrix composite. Results obtained by potentiodynamic polarization method and electrochemical impedance spectroscopy method were in good agreement with one another.

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