Metallic Precipitates in EN Bath
During our EN plating, we are forming metallic like precipitates in our tank. What are some of the possible causes of this problem?
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Q. During our EN plating, we are forming metallic like precipitates in our tank. What are some of the possible causes of this problem? F. T.
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A. Most likely, the precipitate is nickel and there are many possible causes for this problem. Here are a few:
- If using a stainless steel tank, the tank was not passivated properly or it is not anodically
protected. - If using a plastic tank, the tank was not completed stripped and/or not properly passivated.
- The EN solution is not adequately filtered.
- The EN solution requires additional stabilizer. EN solutions must be tested on a frequent basis. Your chemical vendor can help you with this.
- The EN tank is etched or has rough surfaces. The tank may have to be replaced. Rough surfaces can cause precipitation of nickel from the solution.
I also recommend that you acquire a copy of the book, Electroless Nickel Plating by Wolfgang Riedel, ASM International. The book contains much information about managing the EN process. It is available at www.amazon.com.
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