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?
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.
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.
Related Content
-
Products Finishing Reveals 2023 Qualifying Top Shops
Each year PF conducts its Top Shops Benchmarking Survey, offering shops a tool to better understand their overall performance in the industry. The program also recognizes shops that meet a set of criteria to qualify as Top Shops.
-
Advantages to Pumped Eductor Agitation
Not all agitation methods are created equally. Pumped agitation with eductor nozzles can improve process tanks and quickly show a reduction in operating costs while keeping staff safe, following environmental legislation and preventing pollution.
-
3 Tests to Ensure Parts are Clean Prior to Plating
Making sure that all of the pre-processing fluids are removed prior to plating is not as simple as it seems. Rich Held of Haviland Products outlines three tests that can help verify that your parts are clean.
