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Trial Number 2

Trial Purpose:

To evaluate four effective cleaners on a second contaminant

Date Run:

06/08/2001

Experiment 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 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.

Trial Results:

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

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

All four product were effective in removing the corrosion inhibitor.  Each will be evaluated for cleaning the Metal Guard 270.

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