Metal Finishing Guide Book


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Page 537 of 903

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. It should be noted that when running more than one test on a solution, the composition in the hull cell can change rapidly. Therefore, it is recommended that the concentrations of the solution be adjusted if fresh solution is not available for each test. OTHER HULL CELL APPLICATIONS Covering power. Hull cells can be used to also test the covering power of solutions. Tests are usually run at 0.2 amp for 1 minute. This gives a current density of approximately 12 to 0.4 ASF. This current density will usually provide an accurate determination of covering power. The effects of addition agents can also be investigated. Cleaning and base metal compatibility. Hull cells can be used to evaluate the base metal���s ability to accept electroplating. Hull cells can also be used to check the cleaning process prior to electroplating. When proprietary addition agents are used, it is good practice to contact the supplier for specific recommendations. 528

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