الفهرس 
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Abstract
In the present investigation, the corrosion behavior of several Zn MMCs in 1 M HCl aqueous solution was studied. Pure Zn matrix was reinforced with several types of reinforcements, typically, SiC, Al2O3 and Graphite. Such reinforcements were dispersed into the Zn matrix with several weight percents up to 6% (wt.-) using powder metallurgy (P/M) route. The aforementioned reinforcements have a size less than 3 µm. The effect of weight percent and the reinforcement type on the corrosion behavior of Zn-MMCs was extensively investigated. The corroded surfaces of the unreinforced Zn matrix as well as the Zn MMCs were examined using both optical microscope (OM) and scanning electron microscope (SEM) equipped with energy dissipative X-ray (EDX) analyzer.
The results revealed that the corrosion rates of the Zn/Al2O3, Zn/SiC and Zn/Graphite MMCs were decreased with increasing exposure duration. While, increasing the weight percent of the ceramic particles tends to increase the corrosion rate of the fabricated MMCs. Among all investigated MMCs, the Zn/Graphite MMCs containing 2 wt.-% of Graphite particulates exhibited better corrosion resistance than the unreinforced Zn matrix at all exposure durations up to 96 hours. The Zn/SiC MMCs containing 4 wt.-% of SiC particulates exhibited, in most cases, lower corrosion rates than pure Zn matrix but higher than Zn/2 wt.-% Graphite MMCs.
Finally, mathematical empirical correlations for the corrosion rate of the MMCs in the 1 M HCl solution as a function of weight percent of reinforcements and exposure duration were developed. Such correlations can be useful in predicting the corrosion rates of the Zn/SiC, Zn/Graphite and Zn/Al2O3 MMCs with acceptable accuracies.