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In this study, effect of particle size on morphology, alumina content and hardness of electrolessly deposited composite Ni-P/Al2O3 layers was examined with diffrent sizes of codeposited alumina particles. Results on Scanning Electron Microscopy (SEM), Energy Dispersed Spectroscopy (EDS), X-ray Diffraction (XRD) and hardness measurements showed that as particles size increased composition of NiP matrix did not change remarkbly e.g the composition of the obtaiend matrix ranged from Ni90P10 to Ni91P9. | Journal of Chemistry, Vol. 47 (5), P. 608 - 612, 2009 Effect of alumina particle size on properties of electrolessly deposited composite Ni-P/Al2O3 Received 5 January 2009 1 HA MANH CHIEN , MAI THANH TUNG1, DANG VIET ANH DUNG1, HOANG VAN HUNG2 1 Dep. of Electrochemistry and Corrosion Protection, Hanoi University of Technology 2 LILAMA Hot Deep Galvanizing Company Abstract In this study, effect of particle size on morphology, alumina content and hardness of electrolessly deposited composite Ni-P/Al2O3 layers was examined with diffrent sizes of codeposited alumina particles. Results on Scanning Electron Microscopy (SEM), Energy Dispersed Spectroscopy (EDS), X-ray Diffraction (XRD) and hardness measurements showed that as particles size increased composition of NiP matrix did not change remarkbly e.g the composition of the obtaiend matrix ranged from Ni90P10 to Ni91P9. Meanwhile, Al2O3 content in the composites increased as particle size decreased. As a result, hardness of the obtained layers increased with decreasing particle size and maximum hardness was achieved with particle size of 0.6μm. I - INTRODUCTION Autocatalytically deposited Ni-P amorphous alloys have many industrial applications because of their paramagnetic properties, excellent resistance to wear and corrosion, and high hardness [1 - 4]. Codepositing another metallic or non-metallic elements or abrasive/lubricative particles or combination of in binary Ni-P matrix can futher enhance these properties. Recently, electroless nickel composite coatings have gained more attention in reseach community due to their ability to produce coatings that posses improved wear, abrasion and lubrication properties than Ni-P deposits [3-5]. Several particles have been incoporated in the nickel matrix, and among them, the combinations that have received considerable attention are electroless nickel with SiC, B4C, Si3N4, Al2O3 and PTFE and the particles used are of micron size. Codeposition of the paricles depends on
