Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 466 of 707

tion. The test cell will need to be rinsed out after each test. It is recommended to have jiggle cells devoted to each type of plating solution to prevent cross contamination from different solution types. Unique anodes and anodes bags should also be used on different solu- tion types. An example would be semi- bright sulfur-free nickel and bright nickel plating solutions. Figure 3: Air-agitated jiggle cell. The plating tests are normally run on the solution from the plating bath and then evaluated. The solution chemistry or operating conditions are then changed and another plating test is performed. The two panels should then be compared to deter- mine if there is any improvement. SPECIALIZED TESTS Figure 4: Jiggle cell anodes. CONCLUSIONS The jiggle cell is the single piece of test equipment that represents the actual plat- ing conditions in the plating tank. It is especially useful for under shelf and shelf area troubleshooting. PART III Testing Methods for Electroplating Baths The hull cell and jiggle cell are the two most widely used test equipment para- phernalia for electroplaters and electroplating addition agent suppliers. The interpretation of these test results is important. The operator must make a judgment based on previous tests on known acceptable plating solutions. The tables that follow list the common causes and the corrective actions needed to improve a particular plating bath problem. The operator should look at one of the possible causes at a time to determine the correct action. The causes and necessary remedies are listed from the most to least frequent causes. 465 It is common practice to use the jiggle cell for testing the ductility of nickel deposits. Users will use an unbent jig- gle cell cathode and cut or shear off the bottom of the panel to reduce the surface area (and subsequent solu- tion additive depletion). This is com- monly used for semibright and bright nickel ductility evaluations.

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