The effects of heat treatment on the electrochemical properties and corrosion of aluminium alloy AA8011 in an aqueous acid media

• Autorzy: Kelechukwu B. O. , Israel O. O. , Emeka E. O. , Ihebrodike M. M. , Lebe N.
• Języki publikacji: EN

Abstrakty

EN

Effects of heat treatment and quenching regimen on the electrochemical corrosion behaviour of aluminium alloy AA8011 in 0.1M H2SO4 was studied by open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Three different specimens (untreated/ control, air -quenched oven- quenched) were investigated. Polarization results show that all the specimens underwent active dissolution, with no distinctive transition to passivation, heat treatment was observed to shift the corrosion potential towards low anodic values and decreased the rates of anodic partial reactions of the corrosion process. Electrochemical investigations reveal that heat treatment techniques have positive impacts on the alloy as indicated in increase in charge transfer resistance, polarization resistance and decrease in double layer capacitance. These positive effects are attributed to decrease in mean defect size and increase in lattice distortion of the crystallites in the heat treated specimens of the alloy. Studies of X-ray diffraction (XRD) spectra, scanning electron microscopy (SEM) morphologies of control, air and oven quenched samples of AA8011 aluminium alloy indicate decrease in mean defect size of 18.97 % and 40.44 %; increase in the lattice distortion of 11.07 % and 20.04 % for air and oven quenched specimens respectively.

Słowa kluczowe

EN

Heat treatment; Electrochemical Measurement; Double layer capacitance; Mean defect size; Lattice distortion

• Wydawca: Przedsiębiorstwo Wydawnictw Naukowych "DARWIN"
• Czasopismo: International Letters of Chemistry, Physics and Astronomy
• Rocznik: 2014
• Tom: Vol. 5
• Strony: 17--31
• Opis fizyczny: Bibliogr. 23 poz.,ryc., rys, tab.

Twórcy

autor

Kelechukwu B. O.

• Materials Science Group, Department of Physics, Federal University of Technology, Owerri, Nigeria

autor

Israel O. O.

• Materials Science Group, Department of Physics, University of Port Harcourt, Nigeria

autor

Emeka E. O.

• Electrochemistry and Materials Science Research Unit, Department of Chemistry, Federal University of Technology, Owerri, Nigeria

autor

Ihebrodike M. M.

• Materials Science Group, Department of Physics, Federal University of Technology, Owerri, Nigeria

autor

Lebe N.

• Materials/ Electronics Group, Department of Physics/ Electronics, Federal Polytechnic, Nekede Owerri, Nigeria

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