Inhibition of mild steel corrosion by purpald in highly sulfuric acid solution

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7 Citations (Scopus)

Abstract

The inhibition of mild steel corrosion in 2.5M H2SO4 solution by purpald (4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole, 4-Amino-5-hydrazino-1,2,4-triazole-3-thiol) at 30 °C was investigated by means of electrochemical polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization results were comparable with those obtained by impedance measurements. Results showed that purpald performed excellent as inhibitor for mild steel corrosion in 2.5M H2SO4 solution and it attains an efficiency of more than 95% at 4×10-4 M at 30 °C. The inhibition efficiency increases with an increase in the concentration of purpald. Polarization curves show that purpald is a mix-type inhibitor. Changes in impedance parameters (charge transfer resistance, Rct, and double layer capacitance, dl) were indicative of adsorption of purpald on the mild steel surface, leading to the formation of protective films.

Original languageEnglish
Pages (from-to)2758-2766
Number of pages9
JournalInternational Journal of Electrochemical Science
Volume6
Issue number7
Publication statusPublished - Jul 2011

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Steel corrosion
Sulfuric acid
Carbon steel
Polarization
Potentiodynamic polarization
Protective coatings
Corrosion inhibitors
Electrochemical impedance spectroscopy
Charge transfer
Capacitance
Adsorption
sulfuric acid
4-amino-5-hydrazino-1,2,4-triazole-3-thiol

Keywords

  • Acidic corrosion
  • Corrosion inhibition
  • EIS
  • Mild steel

ASJC Scopus subject areas

  • Electrochemistry

Cite this

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title = "Inhibition of mild steel corrosion by purpald in highly sulfuric acid solution",
abstract = "The inhibition of mild steel corrosion in 2.5M H2SO4 solution by purpald (4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole, 4-Amino-5-hydrazino-1,2,4-triazole-3-thiol) at 30 °C was investigated by means of electrochemical polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization results were comparable with those obtained by impedance measurements. Results showed that purpald performed excellent as inhibitor for mild steel corrosion in 2.5M H2SO4 solution and it attains an efficiency of more than 95{\%} at 4×10-4 M at 30 °C. The inhibition efficiency increases with an increase in the concentration of purpald. Polarization curves show that purpald is a mix-type inhibitor. Changes in impedance parameters (charge transfer resistance, Rct, and double layer capacitance, dl) were indicative of adsorption of purpald on the mild steel surface, leading to the formation of protective films.",
keywords = "Acidic corrosion, Corrosion inhibition, EIS, Mild steel",
author = "Musa, {Ahmed Y.} and Mohamad, {Abu Bakar} and Kadhum, {Abdul Amir H.} and Takriff, {Mohd Sobri}",
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pages = "2758--2766",
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TY - JOUR

T1 - Inhibition of mild steel corrosion by purpald in highly sulfuric acid solution

AU - Musa, Ahmed Y.

AU - Mohamad, Abu Bakar

AU - Kadhum, Abdul Amir H.

AU - Takriff, Mohd Sobri

PY - 2011/7

Y1 - 2011/7

N2 - The inhibition of mild steel corrosion in 2.5M H2SO4 solution by purpald (4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole, 4-Amino-5-hydrazino-1,2,4-triazole-3-thiol) at 30 °C was investigated by means of electrochemical polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization results were comparable with those obtained by impedance measurements. Results showed that purpald performed excellent as inhibitor for mild steel corrosion in 2.5M H2SO4 solution and it attains an efficiency of more than 95% at 4×10-4 M at 30 °C. The inhibition efficiency increases with an increase in the concentration of purpald. Polarization curves show that purpald is a mix-type inhibitor. Changes in impedance parameters (charge transfer resistance, Rct, and double layer capacitance, dl) were indicative of adsorption of purpald on the mild steel surface, leading to the formation of protective films.

AB - The inhibition of mild steel corrosion in 2.5M H2SO4 solution by purpald (4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole, 4-Amino-5-hydrazino-1,2,4-triazole-3-thiol) at 30 °C was investigated by means of electrochemical polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization results were comparable with those obtained by impedance measurements. Results showed that purpald performed excellent as inhibitor for mild steel corrosion in 2.5M H2SO4 solution and it attains an efficiency of more than 95% at 4×10-4 M at 30 °C. The inhibition efficiency increases with an increase in the concentration of purpald. Polarization curves show that purpald is a mix-type inhibitor. Changes in impedance parameters (charge transfer resistance, Rct, and double layer capacitance, dl) were indicative of adsorption of purpald on the mild steel surface, leading to the formation of protective films.

KW - Acidic corrosion

KW - Corrosion inhibition

KW - EIS

KW - Mild steel

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M3 - Article

VL - 6

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JO - International Journal of Electrochemical Science

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