Eighteen preweighed coupons were coated with Bencyn B-5186 (64742-52-5, 9003-29-6, 39464-69-2, 63197-48-8) a heavy metal working fluid using a hand held swab. Coupons were reweighed. Nine coupons were clipped to wire racks and immersed into the Flow-Matic machine and cleaned for 1 minutes using ultrasonics at 92 F, removed and rinsed in a tap water spray and re-immersed into the ultrasonics for an additional 1 minute followed by a second 5 second rinse. The nine coupons were then dried using an air knife for 15 seconds and then using a Master Appliance heat gun at 500 F for 15 seconds. The second set of nine coupons followed the same cleaning cycle except they were hung on a wire stand and immersed into a Crest 40 kHz ultrasonic tank.
Trial Results:
Comparison of the two processes revealed that the Flow-Matic system was more effective than the traditional ultrasonic equipment. The following table lists the results obtained during the evaluation.
Table 1. Cleaning Efficiencies
Process
Flow-Matic
Traditional
96.6
56.9
95.0
70.0
70.1
57.4
93.1
51.7
76.9
77.8
68.0
74.1
95.8
67.6
95.2
77.8
80.2
67.5
Average
85.7
66.8
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
For the heavy metal working fluid, the Flow-Matic system was more effective than the traditional ultrasonic method.
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