Thin sheets of stainless steel are low-cost material for fuel cell components that can be easily formed to yield compact volume. Stainless steel satisfies many of the requirements for proton exchange membrane (PEM) fuel cell bipolar plates except its corrosion behavior under the fuel cell operating conditions. Contact resistance as a result of metal oxide formation, and metal dissolution can cause contamination of the membrane electrolyte assembly (MEA). These problems can be solved by coating stainless steel plates with corrosion resistant and conductive layers. This process should be able to make significant improvement on the corrosion resistance and the electrical resistance at a reasonable cost. In this study, AISI 316 stainless steel was coated with the electroless Ni–P alloy deposits. After 45 minutes, 150 minutes and 5 hours deposition, thickness of coating were about 10, 30 and 60 microns respectively and these coatings done in deferent pH as 4.2, 4.7 and 5.2. Deposition rate in lower pH is lower than higher pH. X-ray diffraction analysis showed that, the low pH coatings had semi-amorphous structures and the high pH coatings had semi-crystalline structures. The structures were mixture of amorphous phase and nano-crystalline phase. Low pH coating contained Ni(111), middle pH coating contained Ni(111), Ni 3 P(200), Ni 3 P(211), Ni 3 P(311), Ni 3 P(411), Ni 3 P(640), Ni 3 P(431) and high pH coating contained Ni(111), Ni(220), Ni 3 P(200), Ni 3 P(211), Ni 3 P(311), Ni 3 P(411), Ni 3 P(640), Ni 3 P(431). To evaluate the corrosion resistance of the coated plates, polarization and electrochemical impedance spectroscopic (EIS) studies of the plates were performed in a simulated proton exchange membrane fuel cells (PEMFCs) environment with solutions of 0.5M H 2 SO 4 + 2 ppm F ? . Tafel polarization testing showed corrosion rate in coating with lower pH is better than corrosion rate in coating with higher pH, in samples with 4.2, 4.7 and 5.2 pH coating, corrosion rate were 0.12, 0.20 and 0.71 µA/cm 2 and in AISI316 is 0.63 µA/cm 2 . Tafel polarization testing showed Corrosion potential in coating with lower pH is better than corrosion rate in coating with higher pH, in samples with 4.2, 4.7 and 5.2 pH coating, corrosion potential were -294, -360 and -398 mV. Electrochemical impedance spectroscopy testing after 1 hours immersion of samples in simulated solution showed, resistance pitting corrosion (R pore ) increase with decrease pH. Electrochemical impedance spectroscopy testing after 38 days immersion of samples in simulated solution showed, the solution could diffuse through coating. The electrical property was also evaluated by performing