Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0 M nitric acid

Ahmed Y. Musa, Abu Bakar Mohamad, Abdul Amir H. Kadhum, Eng Pei Chee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The corrosion behaviors of aluminum alloy (Al2024) and copper in 1.0 M nitric acid solution at different temperatures were investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods. The galvanic behavior of coupled metals was also studied using zero resistance ammetry (ZRA) method. The effect of temperature was explained by application of Arrhenius and transition state theory equations. Thermodynamic parameters of activation energy (Ea), enthalpy of activation (ΔH) and entropy of activation (ΔS) were calculated and discussed. Results showed that the values of E and ΔH of Al2024 are lower than copper. This indicates that the corrosion reaction for aluminum alloy need lower energy to occur compared to copper. ZRA result shows that aluminum is the sacrificial anode when coupled with copper in 1.0 M nitric acid solution.

Original languageEnglish
Pages (from-to)5052-5065
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume6
Issue number10
Publication statusPublished - Oct 2011

Fingerprint

Nitric Acid
Nitric acid
Copper
Aluminum alloys
Corrosion
Chemical activation
Potentiodynamic polarization
Aluminum
Electrochemical impedance spectroscopy
Enthalpy
Anodes
Entropy
Activation energy
Metals
Thermodynamics
Temperature

Keywords

  • Aluminum
  • Copper
  • Galvanic corrosion
  • Thermodynamic parameters
  • ZRA

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Musa, A. Y., Mohamad, A. B., Kadhum, A. A. H., & Chee, E. P. (2011). Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0 M nitric acid. International Journal of Electrochemical Science, 6(10), 5052-5065.

Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0 M nitric acid. / Musa, Ahmed Y.; Mohamad, Abu Bakar; Kadhum, Abdul Amir H.; Chee, Eng Pei.

In: International Journal of Electrochemical Science, Vol. 6, No. 10, 10.2011, p. 5052-5065.

Research output: Contribution to journalArticle

Musa, AY, Mohamad, AB, Kadhum, AAH & Chee, EP 2011, 'Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0 M nitric acid', International Journal of Electrochemical Science, vol. 6, no. 10, pp. 5052-5065.
Musa, Ahmed Y. ; Mohamad, Abu Bakar ; Kadhum, Abdul Amir H. ; Chee, Eng Pei. / Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0 M nitric acid. In: International Journal of Electrochemical Science. 2011 ; Vol. 6, No. 10. pp. 5052-5065.
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