The Study On Preparation Of Nano Powder Electroless Composite Coating

As a kind of excellent surface treatment technology with trait of avoiding enviromental pollution, electroless composite plating was set much value on and applied wildly. The special properties of the nano materals made it become the hotspot studied by scientific research worker the recent years. This dissertation studied the process conditions of preparation of Ni-P-AkOa electroless composite coatings using nano powder instead of micron powder.1. This paper made of a study on the influence of primary salt, reducing agent, complexing agent, pH value, bath temperature on the stability and rate of deposition of the bath, moreover found out the their proper process conditions; moreover much more work was laid on the effects of composite stabilizer on the stability and rate of deposition of the bath, and developed a new kind of stabilizer agent D.2. This paper also worked over the influence of various dispersing methods on the properties of the coating; the optimum scope of ultrasonic waves frequency and the concentration of nano powder in the bath were determined.3. The influence of the heat treatment on the microstructures of composite coating using nano powder was studied, The results of comparison with those of the Ni-P coating and Ni-P-A^Os micron powder composite coatings indicated that the properties of the coating using nano powder were super to those of Ni-P coating and Ni-P-AbOs micron powder composite coating.4. In addition, the paper made preliminary step discuss on the mechanism of stability of bath on the thermodynamic and dynamic aspects and electroless composite codeposition using nano powder.