Structural Modification, Strengthening Mechanism and Electrochemical Assessment of the Enhanced Conditioned AA6063-type Al-Mg-Si Alloy

Structural Modification, Strengthening Mechanism and Electrochemical Assessment of the Enhanced Conditioned AA6063-type Al-Mg-Si Alloy

O.S.I. FayomiO.P. Gbenebor M. Abdulwahab C.A. Bolu A.P.I. Popoola 

Faculty of Engineering and the Built Environment, Tshwane University of Technology, P.M.B X680, Pretoria, South Africa

College of Science and Technology, Covenant University, P.M.B 1023, Ota, Ogun state, Nigeria

Corresponding Author Email: 
sunnyfayomi@yahoo.co.uk
Page: 
59-64
|
DOI: 
https://doi.org/10.14447/jnmes.v16i1.54
Received: 
20 August 2012
|
Accepted: 
12 September 2012
|
Published: 
25 September 2012
| Citation
Abstract: 

Enhancement of engineering materials is essential for averting service failure and corrosion attack in the industries. The im- pact of Ni as inoculant and solidification process on the corrosion resistance of an Al-Mg-Si alloy has been investigated in 3.65% NaCl solution using potentiodynamic polarization measurement. The alloying compositions and phase change were determined with energy dis- persive spectroscopy (EDX) and x-ray diffraction (XRD). The surface morphology of the alloyed sample using scanning electron micro- scope (SEM) showed that Ni particles were well dispatched along the interface. The addition of Ni to Al-Mg-Si alloy led to the precipitation and crystallization of Al2Ni and AlNi2 formed at the grain boundaries. Equally, as the percentage of Ni content increases in the alloy, the corrosion rate decreased due to the presence of Al2Ni3 which proceeded at active regions. Inoculation of Ni particles coupled with increase in solidification reduces the possibility of corrosion penetration within the structural interface.

Keywords: 

Al-Mg-Si alloy, conditioning, electrochemical, surface morphology

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
5. Acknowledgements
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