To evaluate the effectiveness of SB-2, SB-11, SB-22, and SB-23 in removing Slide Gel No. 7 from copper and brass coupons as a potential replacement for TCE with a heated ultrasonic cleaning method.
Date Run:
03/01/2024
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 wt of cont.
Final wt of cont.
%Cont Removed
Average % Removal
Copper
SB-2
16
0.0582
0.0583
-0.17
1.84
21
0.0616
0.0599
2.76
27
0.0582
0.0565
2.92
SB-11
2
0.0609
0.0547
10.18
35.64
29
0.0685
0.0263
61.61
39
0.0763
0.0495
35.12
SB-22
16
0.0836
0.0086
89.71
73.96
17
0.0431
0.0212
50.81
40
0.0354
0.0066
81.36
SB-23
11
0.08
0.0154
80.75
87.79
15
0.0677
0.008
88.18
25
0.0665
0.0037
94.44
Brass
SB-2
11
0.036
0.0792
-120.00
-14.96
23
0.0857
0.0328
61.73
34
0.047
0.0407
13.40
SB-11
9
0.0472
0.0530
-12.29
33.10
15
0.0743
0.0430
42.13
18
0.0380
0.0116
69.47
SB-22
2
0.0400
0.0118
70.50
43.75
5
0.0784
0.0270
65.56
14
0.0332
0.0348
-4.82
SB-23
10
0.0708
0.0319
54.94
18.38
17
0.0822
0.0522
36.50
25
0.0270
0.0368
-36.30
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
Overall, the cleaners did not do an effective job removing the contaminants; all coupons were wet with cleaner and/or contaminant after air drying. Copper coupons that were cleaned with SB-22 and SB-23 were less wet but the latter seemed to be more effective.
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