Engineering and Technology Journal Vol. 38, Part A (2020), No. 03, Pages 375-382 Engineering and Technology Journal Journal homepage: engtechjournal.org 375 Publishing rights belongs to University of Technology’s Press, Baghdad, Iraq. Study of the Corrosion Behavior of Zinc-Aluminum Alloy Matrix Composite Reinforced with Nanosilica Produced by Stir Casting Fatima A. Adnan a* , Niveen J. Abdul Kader b , Mohammed S. Hamza c a Materials Engineering, University of Technology, Baghdad, Iraq. Atomi657@gmail.com b Materials Engineering, University of Technology, Baghdad, Iraq. c Materials Engineering, University of Technology, Baghdad, Iraq. *Corresponding author. Submitted: 02/07/2019 Accepted: 14/08/2019 Published: 25/03/2020 KEYWORDS ABSTRACT Zinc-Aluminum alloy, Stir casting, Nanocomposite, Nanosilica, Corrosion behavior and potentiostat. In this investigation, Zn-Al alloy metal-matrix nano composites that reinforced via various weight percentages (2%, 4%, 6%, and 8%) of nanosilica (SiO 2 ) particles were fabricated applying the technique of stir casting. Behaviors of the corrosion of the unreinforced alloy and reinforced composites were measured utilizing a potentiostat test in a (3.5 wt.% NaCl) salt solution. The optical microscopy was employed to investigate the surface microstructure of the composite. Microstructure analysis manifested that the uniform distributions of the reinforcing particles in the composites are alike, consisting of a dendritic structure of the zinc alloy matrix with an excellent reinforcing particles steady dispersion. The improved results of the corrosion resistance for the metal matrix composites showed an excellent resistance to corrosion than the matrix in the (3.5 wt.% NaCl) solution. Raising the weight percentage of the reinforcement particulates of nansilica (SiO 2 ) reduced the composites rate of corrosion. How to cite this article: F. A. Adnan, N. J. Abdul Kader and M. S. Hamza, “Study of the corrosion behavior of zinc-aluminum alloy matrix composite reinforced with nanosilica produced by stir casting,” Engineering and Technology Journal, Vol. 38, Part A, No. 03, pp. 375-382, 2020. DOI: https://doi.org/10.30684/etj.v38i3A.435 1. Introduction High zinc-aluminum alloy (ZA alloys) have been of interest both research and industrial field, as a considerable potential tribo-materiale for the last little decades. It can be said that, at this time, due to the perfect castability and individual compound of characteristics, ZA alloys are commercially available and become the substitutional material firstly for numerous aluminum cast alloys, plastic materials, bearing bronzes, and even for steels, which work under the requirements of high