In this research the deposition process, properties, microstructure and wear behavior of electrole i-P/hard chrome hybridic coating was investigated to improve the wear resistance, hardness and adhesion of the coatings. In order to improving adhesion of coating, sandblast process was performed before plating and then samples were coated by electroless Ni-P/hard chrome coating. To evaluate Effect of thickness on the properties of electroless Ni-P coating, samples were coated with thicknesses of 15, 25, 35 and 45 µm and then were covered by 100µm of hard chrome coating. Finally, the effect of factors such as thickness, temperature and time of heat treatment on properties such as hardness, adhesion and wear resistance of electroless Ni-P/hard chrome hybridic coatings assessed and evaluated by using of methods and devices such as SEM, XRD, EDAX, optical microscopy and microhardness . The wear behavior of electroless Ni-P/hard chrome hybridic coatings were studied by pin on disk wear test in both hot and cold. Tests performed in dry conditions and load from 250 gr to 8 kg, wear distance from 50 to 2000 m and temperature from 50 to 250 ° C were performed. to improve Hardness and wear resistance of electroless Ni-P/hard chrome hybridic coating and according to recrystallization temperature of DHP copper, samples tempering performed at 300-500 ° C at 1/5 to 6 h. results showe that the electroless Ni - P /hard chrome hybridic coating, heat treated at 300 ° C for 6 hours have best properties in wear resistance and hardness. Also be seen the surface sandblasted before coating significantly increases the adhesion of coatings. Key words Hybridic coating, Electroless Ni-P, Heat treatment, Tribological properties.
