Cleanup of Organics
How does one go about using potassium permanganate to clean up the organics in a nickel sulfamate plating tank?
Q: How does one go about using potassium permanganate to clean up the organics in a nickel sulfamate plating tank? C. J.
A: The classic method for removing organics in a nickel plating solution is oxidizing using hydrogen peroxide and than treating with carbon. Potassium permanganate is also an oxidizing agent similar to hydrogen peroxide and works in the same manner. The process is very much the same as when using hydrogen peroxide. The problem of organic buildups seems to be more prevalent in the sulfamate plating bath then in the classic Watts bath.
Start the process in the same manner as you do in the peroxide treatment. After raising the pH instead of adding the peroxide, add five–six ounces per hundred gallons of potassium permanganate dissolved in water. The plating bath must be kept at a hot temperature for least 2–3 hours. Add carbon to the hot bath very carefully (some gassing and bubbling may take place). Stir the bath for 5–10 minutes and then carefully filter the plating solution back to the plating tank. After completion of the filtration step, check your bath chemistry and adjust if needed.
Related Content
-
A Chromium Plating Overview
An overview of decorative and hard chromium electroplating processes.
-
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.
-
In-House Blackening of Ferrous and Non-Ferrous Metals
Process satisfies customers’ shipping requirements while meeting stricter water regulations in times of drought.