en Research Paper Research Paper Abstract: Electroless Nickel (EN) composite coatings embedded with Cr2O3 and/or MoS2 particles were deposited to combine the characters of both Cr2O3 and MoS2 into one coating in this study. The effects of the co-deposited particles on corrosion behavior of the coating in 3.5% NaCl media were investigated. The results showed that both Ni-P and Ni-P composite coatings had significant improvement on corrosion resistance in comparison to the substrate. Codeposition of Cr2O3 in coating improved corrosion characteristic but co-deposition of MoS2 decreased corrosion resistance of the coating. Keywords: Electroless nickel, composite coating, Cr2O3, MoS2, corrosion resistance, Polarization, Impedance. 1 7 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3-132&slc_lang=en&sid=1 N. Eslami Rad* Nazli.eslamirad@gmail.com 180031947532846001145 180031947532846001145 Yes Department of Metallurgy and Materials Engineering,Faculty of Engineering, Universityof Tehran, Tehran, Iran Ch. Dehghanian 180031947532846001146 180031947532846001146 No Department of Metallurgy and Materials Engineering,Faculty of Engineering, Universityof Tehran, Tehran, Iran