| 孙硕.Study on the Development of Nickel Immersion Pretreatment of Electroless Nickel Plating on Al Alloy Surface[J],44(11):21-28 |
| Study on the Development of Nickel Immersion Pretreatment of Electroless Nickel Plating on Al Alloy Surface |
| Received:September 17, 2015 Revised:November 02, 2015 |
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| KeyWord:Aluminum Electroless nickel plating pretreatment nickel immersion research status |
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| Abstract: |
| The elctroless nickel plating layers on aluminum alloy were widely used in various fields because of its excellent wear resistance, corrosion resistance, brazing, etc. Especially in recent decades, it developed in a rapid speed. Aluminum alloy is difficult to be plated because of high chemical activity. Many researches shows that In order to obtain electroless nickel plating with excellent adhesion to the substrate, the key lines is the pretreatment process. Zincate treatment method as a pretreatment process was studied by many researchers, and its effect is good. However, its disadvantages never be ignored. The nickel immersion method can avoid these shortages, and it is expected to replace zinc immersion method. The present article introduces the research status of zincate treatment. At the same time, this paper reviews the mechanism and research situation of activation-nickel immersion method, alkaline elctroless nickel preplating method, double nickel immersion method. The solution of activation-nickel immersion method always don’t contain reducing agent. This method produces a thin layer of nickel catalyst by substitution reaction, ?prompting the deposition of electroless nickel plating closely and evenly in the later process. It belongs to the displacement nickel plating. The solution of alkaline nickel preplating is a kind of nickel salt solution with s reducing agent. This method’s principle is the same as electroless nickel plating. This paper analyzes the difference and contact of the two kinds of nickel immersion methods and the combination treatment?. Finally, the development direction of nickel immersion pretreatment process for aluminum alloy is forecasted |
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