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
-
How to Choose Between Sulfate and Chloride-Based Trivalent Chromium
There are several factors to consider when choosing between sulfate and chloride-based baths for trivalent chromium plating. Mark Schario of Columbia Chemical discusses the differences and what platers should keep in mind when evaluating options.
-
Products Finishing Reveals 2024 Qualifying Top Shops
PF reveals the qualifying shops in its annual Top Shops Benchmarking Survey — a program designed to offer shops insights into their overall performance in the industry.
-
Three Tips for Optimizing Surface Prep for Plating
By identifying oil slicks, performing in-line tests and observing tank appearance, many problems are solved regarding surface preparation in the plating process.
