NiP coatings were electrolessed on carbon steel AISI 1045 without saccharin and in presence of 10 and 20 g/L saccharin in bath solution. Elemental composition of coatings showed 11.2 wt-%W for NiP coating without saccharin in bath solution and 10.7 and 10.6 wt-%W in presence of 10 and 20 g/L saccharin in bath solution respectively. The presence of 10 and 20 g/L saccharin in bath solution caused to co-deposition of 1.0 and 1.4 wt-%W sulphur respectively. The scaning electron microscopy photographs exhibited the refining of nodules size with addition of saccharin to bath solution. The structure of NiP coatings with and without saccharin in bath solution were totally amorphous and with increasing dosage of saccharin to 10 and 20 g/L saccharin in bath solution, the peak broadening of (111) and (220) reflecting planes taked place that indicate the grain refining. The surface roughness coatings in presence of 10 and 20 g/L saccharin were 0.060 and 0.057 µm that indicated the roughness refining compared to the coating without saccharin in bath solution(0.078 µm). The micro hardness measurement of coatings exhibited 454 Hv for NiP coting without saccharin and increasing of hardness to 473 and 620 Hv in presence of 10 and 20 g/L saccharin, respectively. The potentiodynamic polarization and EIS tests showed that addition of saccharin to bath solution had not a devastating effect on the corrosion current density but Corrosion performance will weaken in the anodic region and corrosion resistant in the anodic region severely reduced caused to co-deposition of sulphur. The potentiostatic and EIS analysis in the anodic potential indicated the weaken of protective layer in the presence of saccharin to plating bath. Tribo-corrosion test in the OCP potential on wear track, NiP coating without saccharin showed the lowest potential drop during wear while this coating showed the most worn volume during abrasion and with increasing of saccharin the amount of worn volume decreased probable caused to hardness improvement in this coating. Tribo-corrosion test in the anodic polarization on wear track, the best performance of coated NiP in the worn volume and increasing of current density obtained from the bath containing 20 g Saccharin and probable caused to hardness improvement in this coating. Trib-corrosion test in the cathodic polarization on wear track, minimal degradation of current density and minimal worn volume is obtained from the bath containing 20 g/L Saccharin and probable caused to hardness improvement in this coating. The type of wear mechanism in all cases of tribo-corrosion test was abrasive wear and only a slight weight percent silica (silicon carbide ball as an abrasive substance) was present in the wear track, which explains the slight adhesive wear mechanisms. Friction coefficient at open circuit potential, anodic and cathodic were calculated. The results showed that increasing the saccharin caused to increasing of hardness and reduction of adhesion between coating/abrasive ball and the friction coefficient was reduced. The lowest coefficient of friction between different types of potential was cathodic potential and the possible cause is adhesion loss in interfacial coating /abrasive ball. Keywords: Electroless NiP coating, Saccharin, Microhardness, Corrosion, Tribocorrosion, Potentiodynamic, Potentiostat, EIS, Friction coefficient