Development of Electroless Ni-P-Al2O3 and Ni-P-TiO2 Composite Coatings from Alkaline Hypophosphite Gluconate Baths and their Properties

作者：Gawad S A Abdel^*; Baraka A M; Morsi M S; Eltoum M S Ali

来源：International Journal of Electrochemical Science, 2013, 8(2): 1722-1734.

• Ni-P-Al2O3 composite coatings
• Ni-P-TiO2 composite coatings
• gluconate baths
• electroless Ni coatings
• Ni-alloys
• matrix composite
• alkaline hypophosphite baths
• corrosion resistance

The performance of electroless deposited Ni-P-alumina and Ni-P-titania, composite coatings from alkaline hypophosphite gluconate baths, on copper substrate was studied. The effect of both TiO2 and Al2O3 (g/L) on the deposition rate of Ni-P-TiO2 and Ni-P-Al2O3 alloys respectively were investigated. The amount of particles incorporated in the coatings increased with increasing particle concentration in the bath. However, the particle size greatly affected the amount incorporated. The addition of these particles changed the microstructure of the Ni-matrix, and enhanced the hardness and corrosion resistance. Also, the coating brightness, coherence and uniform surface distribution were improved. The changes in the hardness and structure of deposits were studied by X-ray diffraction, scanning electron microscopy and energy-dispersive x-ray spectroscopy methods.

• 出版日期2013-2