Noncyanide Strippers to Replace Cyanide Strippers. Volume 3
Final rept. Oct 1989-Sep 1990
IDAHO NATIONAL ENGINEERING LAB IDAHO FALLS
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This report presents the results of an Idaho National Engineering Laboratory INEL study of three electrolytic silver strippers that were tested in addition to three new immersion nickel strippers. Two nickel strippers successfully completed field testing last year. Frederick Gumms CELOP 204 and Electrochemicals, Nickel-Sol were placed in service in the plating shop at Kelly AFB July through September 1990. This research has yielded at least one formulation containing ethylenediamine sodium m-nitrobenzenesulfate, nitric acid, sodium nitrate, and ammonium thiocyanate worthy of field testing. The formulation is for stripping electrolytic nickel. Other formulations, especially those for stripping electroless nickel, need further investigative work. A by product of the field test stripping process above is redwater in the waste stream. An investigation was unable to identify the chemical species responsible for the colored water. The report recommends 1 that at least one generic nickel stripper formulation be field tested, 2 one of the silver strippers McGean-Rohcos Rostrip 999-SP be implemented at the ALC, and 3 further attempts be made to discover the source of the redwater in the waste stream.
- Coatings, Colorants and Finishes