Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 434, Issue 1-2, Pages 319-325Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.06.098
Keywords
surfactant; composite coatings; zeta potential; wear resistance
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Ni-Al2O3 composite coatings were electrodeposited from a Watts-type bath containing particles in suspension, which were dispersed with the aid of a cationic surfactant hexadecylpyridinium bromide (HPB). The effects of the surfactant on the zeta potential, co-deposition and distribution of Al2O3 particles in nickel matrix, and tribological properties of composite coatings were investigated. Experimental results showed that the addition of HPB could improve the amount of co-deposited Al2O3 particles, reduce the agglomeration of particles and achieve a more uniform distribution of Al3O3 particles in the nickel matrix. The wear resistance of the composite coatings increased with increasing concentration of HPB up to a certain optimum of 150 mg l(-1), beyond which a decreasing trend of wear resistance was observed under dry sliding and oil-lubricated conditions. This is probably due to the increased brittleness of metal matrix when the concentration of surfactant exceeded the optimum. (c) 2006 Elsevier B.V. All rights reserved.
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