To evaluate the effectiveness of SB-2, SB-11, SB-22, and SB-23 in removing LMKT Lapping Compound from copper and brass coupons as a potential replacement for TCE with a heated ultrasonic cleaning method.
Date Run:
03/04/2024
Experiment Procedure:
Three copper and brass coupons were used for each cleaner being tested, for a total of 12 coupons per cleaner. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the contaminate with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected to heated ultrasonic at 140 degrees Fahrenheit in the cleaners for 15 minutes. After the coupons were cleaned, they were left to air-dry overnight. The next morning, the clean weights of each coupon were taken.
Trial Results:
Substrate
Cleaner
Coupon #
Initial weight of cont.
Final weight of cont.
%Cont Removed
Average % Removal
Copper
SB-2
4
0.0259
0.0416
-60.62
-208.76
21
0.0184
0.0621
-237.50
39
0.0238
0.1019
-328.15
SB-11
2
0.0371
0.0356
4.04
-19.66
3
0.0310
0.0508
-63.87
11
0.0352
0.0349
0.85
SB-22
16
0.0285
0.0017
94.04
96.08
17
0.0312
0.0007
97.76
21
0.0311
0.0011
96.46
SB-23
6
0.0361
0.0135
62.60
45.39
22
0.0361
0.0297
17.73
40
0.0326
0.0144
55.83
Brass
SB-2
5
0.0175
0.0466
-166.29
-155.92
11
0.0264
0.0374
-41.67
16
0.0112
0.0403
-259.82
SB-11
10
0.0226
0.021
7.08
-22.10
18
0.0193
0.0244
-26.42
25
0.0213
0.0313
-46.95
SB-22
12
0.0155
-0.0055
135.48
121.77
15
0.0162
-0.0034
120.99
18
0.0305
-0.0027
108.85
SB-23
7
0.0203
0.0087
57.14
21.71
28
0.0196
0.0192
2.04
31
0.0319
0.03
5.96
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
SB-2 and SB-11 did not dry properly overnight, and in some cases, their final contents were higher than their initials. SB-22 and SB-23 seemed like effective alternatives, but due to the "overcleaning" causing negative final weights, further testing can be done to determine the ideal range of cleaning time and contaminants added.
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