Characteristic Of Ni-Al2O3 Nanocomposition Coatings

Ingredient and microstructure of Ni-Al2O3 nanocomposition coatings fabricated by jet electrodeposition were measured by the scanning electron microscope(SEM) with energy dispersive analyzer system (EDX), the microhardness tests were conducted on an microhardness tester. The results shows that the Ni deposited layers have nanocrystalline microstructure with average size of 50 nm. Al2O3 particles are well dispersed in layer and the particles content is up to 12.2at %. The composite coating prepared is face-centered cubic structure and represented a (2 0 0) preferential orientation. Microhardness of the coating increase and corrosion resistance of the coatings first increase then decrease with increase of Al2O3. content in coatings. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]