Trial Purpose:
To evaluate successful cleaners on third contaminant.
Date Run:
06/11/2001Experiment Procedure:
The four successful cleaners from the previous trial were again diluted to 5% using DI water in 600 ml beakers and placed in a Crest 40 kHz ultrasonic tank model 4Ht 1014-6. Solutions were heated to 130 F. Twelve preweighed coupons were coated with Spartan Chemical MOAC 2945 (64742-52-5, 64742-53-5, 63449-39-8, 68608-26-4, 68918-91-2, 8002-26-4, 111-46-6, 107-41-5, 4719-04-4) and reweighed. Three coupons were immersed into each solution and cleaned for five minutes. The coupons were rinsed in tap water at 120 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for 1 minute. Final "clean" weights were recorded and efficiencies were calculated.
Trial Results:
Again all four cleaners were very successful in removing the contaminant from the steel coupons. The table lists the calculated results for each solution.
| Cleaner | Coupon 1 | Coupon 2 | Coupon 3 | Average | Std Dev |
| 1 | 99.85 | 100.02 | 100.06 | 99.98 | 0.11 |
| 2 | 99.56 | 100.07 | 100.04 | 99.89 | 0.29 |
| 3 | 100.14 | 100.05 | 100.07 | 100.08 | 0.05 |
| 4 | 100.09 | 100.08 | 100.07 | 100.08 | 0.01 |
During the cleaning process, it was observed that all four solutions required 2 minutes or less to remove the coolant. When the coolant was removed from the coupon, the cleaning solution become cloudy. This may be a problem for
treatment of the solution after prolonged use.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.Conclusion:
The four solutions removed all of the contaminant from the coupons within 2 minutes of ultrasonic cleaning. The contaminant did not separate out from the cleaning solution after the trial was completed.
