Trial #2
To evaluate four effective cleaners on a second 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 Chemtrol 331 corrosion inhibitor (102-71-6, 111-42-2) 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.
All four products had no problems removing the Chemtrol 221 from the steel coupons. The cleaning time of 5 minutes was more than was required to clean the coupons. The following table lists the calculated efficiencies for each coupon.
| Cleaner
|
Coupon 1
|
Coupon 2
|
Coupon 3
|
Average
|
Std Dev
|
| 1
|
100.13
|
99.94
|
100.07
|
100.05
|
0.10
|
| 2
|
100.00
|
100.03
|
99.87
|
99.97
|
0.09
|
| 3
|
100.18
|
100.11
|
99.96
|
100.08
|
0.11
|
| 4
|
99.96
|
100.04
|
99.96
|
99.99
|
0.04
|
All four product were effective in removing the corrosion inhibitor. Each will be evaluated for cleaning the Metal Guard 270.
No relation