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This study aims to investigate the effect of the addition of 40 % by volume NiAl particles with different grain sizes to the pure Al matrix on the corrosion performance of the produced composites. NiAl particles used as reinforcement material were produced by arc melting method at a ratio of 1:1 by atom and turned into fine particles by mechanical grinding method. Afterwards, it was classified in different sizes by vibrating sieve and used in composite production. Thus, the effect of particle size on the corrosive properties of the produced composites was investigated. Production with pressure infiltration method was preferred in order to keep the reinforcement particle ratio high and to provide homogeneous distribution. The corrosive properties of the composites were determined by applying potentiodynamic polarization and immersion corrosion test in 3.5 % NaCl environment. When the data obtained were evaluated, the corrosion rates in all three samples were close to each other on the 7th day. On the 21st day, the corrosion rate was 0.001 mm/year in sample A with a grain size of 45 -63 µm, while it was measured as 0.0075 mm / year in sample C with a grain size of 90 -125µm. In both test methods, it was observed that the corrosion resistance increased as the grain size decreased.