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Trial Number 6

Trial Purpose:

To evaluate the removal of Oak FR-529 from copper fin stock.

Date Run:

03/22/2022

Experiment Procedure:

18 samples of copper fin stock were weighed and set aside for 4 hours, 1 day, and 7 days. They were all dipped in the Oak FR-529 oil and all excess oil was allowed to drip off. They were then weighed for dirty weights. The 1 day and 7 day samples were set aside. After four hours, six of the coupons were ready to be cleaned. The cleaners were heated to their vendor recommended temperatures (Mirachem 500 at 33% concentration and 140F and Waterworks at 33% concentration and 105F) and were placed in the heated ultrasonics tank. Three coupons per cleaner were immersed and the ultrasonics tank was run for 15 minutes at 40 KhZ. They were then placed on trays and left to dry. After drying, they were weighed for clean weights. The 1 day samples were weighed the next day before and after the same method of cleaning. The 7 day samples were weighed after 1 day and weighed at 7 days before and after cleaning.

Trial Results:

Gravimetric Results:

Cleaner Time Initial wt. of cont. Final wt. of cont. %Cont Removed % Average
Mirachem 500 7 days 0.0151 0.0024 84.11 89.01
0.0234 0.0023 90.17
0.0235 0.0017 92.77
Waterworks 7 days 0.0324 -0.0002 100.62 96.65
0.0200 0.0003 98.50
0.0120 0.0011 90.83
Mirachem 500 1 day 0.0164 0.0002 98.78 97.43
0.0191 0.0004 97.91
0.0205 0.0009 95.61
Waterworks 1 day 0.0272 0.0002 99.26 97.87
0.0227 0.0002 99.12
0.0293 0.0014 95.22
Mirachem 500 4 hours  0.0267 0.0085 68.16 68.58
0.0236 0.0098 58.47
0.0244 0.0051 79.10
Waterworks 4 hours  0.0200 0.0100 50.00 61.81
0.0222 0.0060 72.97
0.0221 0.0083 62.44

The table below demonstrates the changes in weight of the contaminant on the copper fin stock over 1 day and 7 days before any cleaning occurred.

Changes In Cont. Weight Overtime
Cleaner Time Initial Day wt. Change in wt. after 1 Day Change in wt. after 7 days Remaining wt. to be cleaned
Mirachem 500 7 days 0.0151 -0.0131 -0.0003 0.0017
0.0234 -0.0207 0.0000 0.0027
0.0235 -0.0216 -0.0002 0.0017
Waterworks 7 days 0.0324 -0.0294 0.0000 0.0030
0.0200 -0.0174 -0.0004 0.0022
0.0120 -0.0093 -0.0005 0.0022
Mirachem 500 1 day 0.0164 -0.0147 - 0.0017
0.0191 -0.0171 - 0.0020
0.0205 -0.0181 - 0.0024
Waterworks 1 day 0.0272 -0.0210 - 0.0062
0.0227 -0.0205 - 0.0022
0.0293 -0.0267 - 0.0026

Success Rating:

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

Conclusion:

Both cleaners were not very effective at removing the oil after 4 hours. Removal results improved greatly from 4 hours to 1 day.  After 1 day the majority of the contaminant on the copper fin stock had evaporated and both cleaners were  effective. Between 1 and 7 days there was little change between the amount of contaminant that remained on the substrate. Removal results after 7 days was consistent with Waterworks and very effective. Mirachem 500 results after 7 days had decreased slightly and was less effective overtime at removing the contaminant.

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