To evaluate the effectiveness of SB-2, SB-11, SB-22, SB-23, and SB-32 in removing LMKT Lapping Compound from copper and brass coupons as a potential replacement for TCE with an unheated ultrasonic cleaning method.
Date Run:
02/26/2024
Experiment Procedure:
Three copper and brass coupons were used for each cleaner being tested, for a total of 15 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 unheated ultrasonic 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 Content Weight
Final Content Weight
Percent Content Removed
Average Percent Removed
Copper
SB-2
2
0.0615
0.0981
-59.51
-101.13
12
0.0429
0.0935
-117.95
15
0.0351
0.0793
-125.93
SB-11
7
0.0293
0.0327
-11.60
-20.67
17
0.0301
0.0429
-42.52
21
0.0266
0.0287
-7.89
SB-22
11
0.0497
0.0012
97.59
102.46
23
0.047
0.0006
98.72
27
0.0217
-0.0024
111.06
SB-23
1
0.0369
-0.0006
101.62
98.63
14
0.0326
0.0009
97.24
31
0.0303
0.0009
97.03
SB-32
3
0.0617
-0.0009
101.46
103.42
6
0.0339
-0.0021
106.19
16
0.0424
-0.0011
102.59
Brass
SB-2
9
0.0181
0.0161
11.05
24.35
11
0.0494
0.0251
49.19
25
0.0234
0.0204
12.82
SB-11
12
0.0202
0.0325
-60.89
-3.04
14
0.0378
0.0277
26.72
23
0.0379
0.0284
25.07
SB-22
4
0.0454
-0.0027
105.95
109.58
15
0.0281
-0.004
114.23
17
0.028
-0.0024
108.57
SB-23
2
0.0245
-0.0027
111.02
106.20
8
0.0201
-0.0026
112.94
10
0.0636
0.0034
94.65
SB-32
16
0.0502
-0.0054
110.76
99.67
18
0.0503
0.0078
84.49
34
0.0585
-0.0022
103.76
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, making their final contents higher than their initials. SB-22 and SB-23 seemed like effective alternatives, but due to the "overcleaning" causing negative percent removals, further testing could be done to create the ideal range of cleaning time and contaminants added. SB-32 turned light blue after testing, this was caused by the Ethyl Lactate stripping copper ions from the metal and the mixture will not be used in further testing.
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