%0 Journal Article
%T Corrosion Behavior of Zinc-Graphite Metal Matrix Composite in 1£żM of HCl
%A M. A. Afifi
%J ISRN Corrosion
%D 2014
%R 10.1155/2014/279856
%X This paper is aimed at investigating the corrosion behavior of Pure and Zinc-graphite particles with percentage of 1, 3, and 5%, respectively. The composites were fabricated by powder metallurgy method. Corrosion tests were performed according to ASTM standard. Corrosion rate was calculated and it is found that in all cases the corrosion rate was decreasing with the increase in exposure time. Meanwhile, the microstructure of composites was imaged and analyzed using optical microscope and scanning electron microscope. It is observed that the best corrosion resistance was zinc with 1% Graphite while Zinc with 3% and 5% Graphite composites did not enhance the corrosion resistance comparing to pure Zinc. 1. Introduction Increasing use of advanced composites materials is being made especially in aircraft and aerospace vehicles. Metal matrix composites (MMCs) are currently being developed as possible structural materials, offering improved elastic modulus, strength, elevated temperature properties, and control over the coefficient of thermal expansion. The resulting high specific properties can provide significant weight saving in many components compared with conventional alloys [1]. The corrosion behavior of the composites in various environments that the material is likely to encounter is one important consideration in choosing a suitable material for a particular application. It follows from the literature that limited work has been done to study the corrosion behavior of MMCs. Though a few studies concerning the corrosion behavior of MMCs state that they suffer severer attack than the respective nonreinforced alloys [2]. It has been established that the corrosion behavior of MMCs is influenced by various factors like composition of the alloy used, the reinforcing particles used, its size and distribution in the matrix, the technique adopted for fabrication, and the nature of interface between the matrix and reinforcement. Even a very small change in any one of these factors can seriously affect the corrosion behavior of the material [3]. Corrosion behavior of zinc composites with nano-CeO2, which were prepared by powder metallurgy method, was reported and it was shown that the corrosion has been improved significantly using mass fraction of 1% of CeO2 [4]. Seah et al. have investigated the corrosion characteristics of cast ZA-27 alloy reinforced with graphite particles (1, 3, and 5% wt) which results in increasing corrosion rate [5]. In the investigation carried out by Seah et al., the effect of the graphite particles content on corrosion behavior of
%U http://www.hindawi.com/journals/isrn.corrosion/2014/279856/