Trial #3
To evaluate successful cleaners on third contaminant.
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.
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.
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.
No relation