Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 102 of 707

retain water due to capillary action, then an ultrasonic rinse will be required. This is because a heated static rinse will not remove trapped chemicals and debris from tiny capillary holes. Small blind holes are rinsed by diffusion rather than by flush- ing. Ultrasonics will add the impingement energy necessary to flush these diffi- cult areas. Typical parts that require an ultrasonic rinse are textile spinnerettes, ultra-high-pressure diesel-fuel nozzles, hypodermic needles, and parts that nest or stick together. In a cascading system the ultrasonic rinse should be the final rinse. Again, the best way to make your final process determination is by doing careful laboratory analysis. Be sure to work with an equipment supplier who can help you develop a process and choose the chemistry and equipment. Most major ultrasonic and cleaning equipment suppliers have laboratory facilities and will do sample parts cleaning for you at no charge. Take advantage of the resources available to you. 101

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