Aluminum 2618 matrix composites (AMCs) reinforced by AlN, Si3N4 & ZrB2 particles were fabricated from Al2618- x wt% AlN, Si3N4, ZrB2 (x = 0, 2, 4, 6, 8) by stir casting. In ZrB2 particles were fabricated by in-situ reaction from mixtures of K2ZrF6 & KBF4. The mechanical properties of the composites were increased with respect to the percentage of weight. The corrosion behavior of metal matrix composites (MMCs) is strictly linked with the presence of heterogeneities such as reinforcement phase, micro crevices, porosity, secondary phase precipitates, and interaction products. The present work is investigated relating to the corrosion resistance of Aluminum (2618) metal matrix composites (AMCs) reinforced with AlN, Si3N4 & ZrB2 was investigated by electro chemical studies such as polarization study and AC impedance spectra. The above materials are immersed in an aquaise 3.5% Sodium Chloride (Nacl) solution corrosion parameters such as corrosion potential (Ecorr), corrosion current (Icorr), Linear Polarization Resistance (LPR), charge transfer resistance (Rt), Double layer capacitance (Cdl) will be evaluated from this and the most corrosion resistance material is determined. Finally the results are obtained by the polarization studies and AC impedance spectra which leads to the conclusion that the corrosion resistance of 0% of Al2618 alloy has a low corrosion resistance and the composites have a high corrosion resistance. The corrosion resistance is gradually increased with respect to the Wt% of composites (2%, 4%, 6%, 8%). © 2015 Elsevier B.V. All rights reserved.