To evaluate the effectiveness of SB-2, SB-11, SB-22, SB-23, and SB-32 in removing Slide Gel No. 7 from copper and brass coupons as a potential replacement for TCE with an unheated ultrasonic cleaning method.
Date Run:
02/24/2024
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 wt of cont.
Final wt of cont.
%Cont Removed
Average % Removal
Copper
SB-2
2
0.0619
0.0714
-15.35
-74.60
11
0.0269
0.0675
-150.93
16
0.0386
0.0608
-57.51
SB-11
16
0.0264
0.0312
-18.18
-12.06
26
0.0314
0.0298
5.10
40
0.0290
0.0357
-23.10
SB-22
7
0.0590
0.0124
78.98
82.10
17
0.0348
0.0022
93.68
39
0.0531
0.0140
73.63
SB-23
5
0.0305
0.0018
94.10
97.69
21
0.0529
0.0015
97.16
29
0.0390
-0.0007
101.79
SB-32
4
0.0329
0.0163
50.46
73.11
25
0.0276
0.0056
79.71
27
0.0406
0.0044
89.16
Brass
SB-2
7
0.0384
0.0058
84.90
43.33
14
0.027
0.0299
-10.74
22
0.0326
0.0144
55.83
SB-11
11
0.0241
0.0175
27.39
26.07
18
0.0432
0.0177
59.03
32
0.0305
0.033
-8.20
SB-22
5
0.0355
0.0152
57.18
60.61
26
0.0412
0.0168
59.22
31
0.035
0.0121
65.43
SB-23
2
0.0425
0.0105
75.29
86.13
15
0.0309
0.0013
95.79
25
0.0244
0.0031
87.30
SB-32
6
0.0572
0.0173
69.76
63.89
10
0.0533
0.0222
58.35
28
0.0343
0.0125
63.56
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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