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Study of Electroless Plating Nickel Coating on NaNo Alumina Powder

Author: XingShuangYing
Tutor: WenGuangWu
School: Harbin Institute of Technology
Course: Materials Science
Keywords: electroless plating ultrasonic nano alumina plating rate coating elements
CLC: TQ153.1
Type: Master's thesis
Year: 2008
Downloads: 38
Quote: 1
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Abstract


Nanoα-Al2O3 powder （100nm） was used as raw material in this paper, and pretreated in Pd colloid solution to plant Pd particles on the surface of alumina. NaH2 PO2 and BNH6 were used as reducing agents to fabricate Ni-P/Al2O3 and Ni-B/Al2O3 composites powder. XRD,SEM and TEM were used to analyzed the structure of composite and to study the coating morphology. X-ray photoelectron （XPS） was used to analyze the composition of the composite and coating characteristic.In this paper, ultrasonic wave was used in electroless plating, and plating successfully realized at low temperature （minimum temperature 30℃）. Avoiding nano-particles get together due to the particles colliding properties may be high at higer temperature. And at the same time, mirror phenomenon can also be avoided. The plating rate would accelerate when the concentration of NaH2 PO2 increased, due to coating mass grown up, though plating time prolonged.In electroless Ni-P part, the results revealed that with the increasing of pH value, NiSO4 and powder load would short plating time, and the plating rate would boost. Maximum plating rate can be gained when pH value is 5.5 and temperature reach to 60℃. Coating morphology indicated that favorable coating formed （about 20nm thick） at 40℃and pH value keep 4.5. Phosphor content was analyzed, it revealed that the lowest content of phosphor is only 8.8 %（wt） at the pH value 6.0 and 10g/l of NaH2 PO2. XPS results indicates that electroless nickel plating on alumina was successfully realized. The results disclosed that plating rate would accelerate with the increasing of pH value, higher concentration of NiSO4 and BNH4, and higher temperature.Electroless plating Ni-B indicates that using new reductant of BNH6 favorable morphology and structure coating formed of Ni-B/Al2O3. Plating rate would accelerate with the increasing of pH value, higher concentration of NiSO4 and BNH4, and higher temperature. Maximum plating rate and highest boron content （6.25%） would acquire at 6g/L BNH6. And lowest boron content （3.68%） can get at PH value 8.0, and 2g/L BNH 6. Contrast experiments indicated that higher nickel content can be obtained, using electroless Ni-B plating method rather than electroless Ni-P plating method. Stabilized bath can be obtained by using NH3BH3 as reductant, and the bath keep neutral before and after electrpless plaitng, so the pH value is easy to control; However, pH value need to be consecutively adjusted to keep the rection during the process of electroless Ni-P.

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CLC: > Industrial Technology > Chemical Industry > Electrochemical industries > Electroplating industry > A single metal plating
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