Synthesization And Characterization Of Nano Electroless Coating Of Cu-Sn-B

Cu-Sn alloy is widely used in the machine industry, such as bearings and wheel gears, for its high strength, good flexibility, abrasion resistance and corrosion resistance. And, owing to the moist surface, it can also be used as an active solder. However, little research is carried out on Nano electroless plating of the Cu-Sn-B. In this paper, firstly the fundamental technology was obtained by orthogonal experiment method. Then we systematically researched the productions of nano plating of Cu-Sn-B on the alumina and copper substrate. Meanwhile, the nano alloy powder was produced with the same ingredients. The influences of concentrations of main salt, complexing agent, and deoxidizer in the plating bath on the nano film and nano alloy powder were mainly studied.1. From the orthogonal experiment method, we obtained the specific experimental parameters as follows: the concentrations of CuSO5·5H2O,Na2 Sn O3·4H2O, Na BH4, Na3C6H5O7·2H2O and CH4N2 S is 0.12mol·L-1,0.10mol·L-1, 0.50mol·L-1, 0.50mol·L-1and 10.00mg·L-1 respectively, pH value is 12~13 and the reaction time is 1 min at room temperature.2. The crystal structure of the nano-coating on alumina substrate is a cubic Cu phase. When the concentration of complexant is less than0.5mol·L-1, the coating rate remains constant with the change of concentration of complexant. While when the concentration ofcomplexant increases beyond 0.5mol·L-1, the coating rate declines dramatically. But the shape and particle size of nano film gradually becomes smooth and uniformly respectively with the increasing of concentration of complexant.3. The crystal structure of the nano-coating on copper substrate is also a cubic Cu phase. With the increasing of concentration of main salt,the rate of nano-coating firstly rises and then falls. While with the increasing of concentration of deoxidizer, the rate of nano-coating falls firstly and then rises. However, these changes of concentrations show little effects on the shape of nano-coating and the partical size which remains uniformly during these processes.4. The crystal structure of nano alloy power of the same ingredients stays the Cubic Cu phase. And it has many shapes, such as pagoda, needle and octahedron.5. XRD of nano-coating on alumina substrate gives(111) a reflection peak at 2θ=43.29°, corresponding a d-spacing of 2.088 ?.While The XRD of alloy powder of same ingredients gives(200) a reflection peak at 2θ=94.378°, corresponding a d-spacing of 1.05 ?.According to these results, the structure of nano-coating on alumina substrate is different from that of alloy powder of same ingredients.Moreover, from SEM, the shape of film of nano plating on alumina or copper substrate is different from that of nano alloy powder of the samecomponents. The latter has richer shapes, such as pagoda, needle,octahedron, etc.