The purpose of this experiment was to retest heated ultrasonic cleaning on three potential top cleaners.
Date Run:
02/08/2021
Experiment Procedure:
Cleaners were prepared to the following concentrations: Dimethyl Glutarate 100%, Water Works Heavy Duty Degreaser 7:1, SC Aircraft & Metal Cleaner 20%. An ultrasonic bath was set to 100°F and cleaners were heated to the same temperature. Three aluminum coupons were obtained and weighed for each of the cleaners being tested. Coupons were then soiled with aviation grease and a dirty weight was recorded. Once solutions reached the proper temperature, coupons were submerged into their respective cleaners and heated ultrasonic cleaning was conducted for 15 minutes. After the 15 minutes had passed, coupons cleaned with SC Aircraft were submerged into a deionized water bath also at 100°F for 30 seconds. All coupons were then partially dried with a heat gun and allowed to finish drying in air for 24 hours. Following the drying step, coupons were weighed again and a clean weight was recorded. Effectiveness of the cleaners was determined.
Trial Results:
Cleaner
Initial wt of Cont
Final wt of Cont
%Cont Removed
%AVG
Dimethyl Glutarate
0.182
0.165
9.34
33.49%
0.1331
0.0832
37.49
0.113
0.0524
53.63
Water Works
0.1141
0.0079
93.08
92.07%
0.1539
0.0081
94.74
0.1016
0.0118
88.39
SC Aircraft & Metal
0.187
0.1118
40.21
71.27%
0.1226
0.0198
83.85
0.1374
0.0141
89.74
By increasing the beaker size to give more space between the substrates, removal performance significantly increased for Water Works and SC Aircraft, although SC Aircraft did not reach the same removal performance as in the unheated ultrasonic trial. This could be due to the current solution becoming over saturated with use; however, the cleaner will be progressed to next steps of testing. Dimethyl Glutarate did not increase in removal performance and has had poor performance overall in removing the grease from aluminum substrates. Therefore, Dimethyl Glutarate will be discontinued from further testing. Next steps will be to test current best cleaners and methods with the vanishing oil soil on aluminum substrates.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Upon completion of testing, it was determined that using larger beakers to give more space between the substrates significantly benefited Water Works and SC Aircraft. Both cleaners will be progressed to the next phase of testing. Dimethyl Glutarate did not increase in performance and will be discontinued from further testing. Next steps of testing will be to determine the performance of best cleaners and methods on the vanishing oil soil.
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