The purpose of this experiment was to determine the effectiveness of best cleaners and method on copper substrates.
Date Run:
02/10/2021
Experiment Procedure:
Cleaners were prepared to the following concentrations: Metalnox 6386 100%, Water Works Heavy Duty 7:1, SC Aircraft & Metal 20%. Solutions and an ultrasonic bath were heated to 100°F. Three copper 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 15 minutes, coupons cleaned with SC Aircraft were rinsed in a deionized water bath at 100°F for 30 seconds. All coupons were then partially dried with a heat gun to remove excess solution 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
Metalnox 6386
0.1998
0.0044
97.8
98.85%
0.1082
0.0009
99.17
0.1156
0.0005
99.57
Water Works
0.0982
0.0114
88.39
88.73%
0.1023
0.0124
87.88
0.1229
0.0124
89.91
SC Aircraft & Metal
0.1272
0.0587
53.85
40.74%
0.1325
0.0783
40.91
0.2079
0.1508
27.47
It was verified that the cleaners and ultrasonic method were compatible with copper substrates. Although SC Aircraft performed lower than in previous trials, this could be due to the solution becoming saturated with use. The coupons cleaned with SC Aircraft did not sustain any damage or alterations indicating that the cleaner is stripping the metal. Next steps would be to progress all three cleaners to parts testing using fresh solutions.
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 all cleaners were compatible with copper substrates in heated ultrasonic cleaning. With an established set of cleaners and an optimized method that is compatible with company substrates, next steps would be to progress to parts testing with fresh solutions.
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