To evaluate the effectiveness of aqueous-based and solvent-based cleaners at the removal of American Lapping Compound by S.E Shires using unheated immersion on copper, brass, and copper/nickel (90/10) substrates by gravimetric and visual analysis.
Experiment Procedure:
Three pre-weighed coupons per substrate were soiled with American Lapping Compound, using a cotton swab. Each set of coupons were immersed into a beaker with one of the six cleaners for 30 minutes. During this process, any noticeable soil removal was observed at five minute intervals. After immersing, final weights were recorded and efficiency was calculated for each coupon cleaned.
Trial Results:
Table 1: Gravimetric Results
The soil visually was not removed from each substrate for each cleaner. After drying for 24 hours, some coupons were still wet from the cleaner, indicating the soil may have absorbed moisture causing a negative percent contaminant removal.
Cleaner
Substrate
Initial wt of cont.
Final wt of cont.
%Cont Removed
% Average
Overall % Removal
Aquavantage 1400 10%
Copper
0.2162
0.2162
0.00
-0.09
-0.28
0.2909
0.2909
0.00
0.2996
0.3004
-0.27
Brass
0.2326
0.2338
-0.52
-0.40
0.3657
0.3664
-0.19
0.3008
0.3023
-0.50
Copper/Nickel
0.2873
0.2889
-0.56
-0.34
0.2811
0.2804
0.25
0.2349
0.2366
-0.72
Surface Cleanse 930 5%
Copper
0.3623
0.3623
0.00
-0.07
-0.32
0.3680
0.3682
-0.05
0.4199
0.4206
-0.17
Brass
0.4543
0.4539
0.09
-0.47
0.3187
0.3224
-1.16
0.6173
0.6194
-0.34
Copper/Nickel
0.1773
0.1806
-1.86
-0.42
0.1614
0.1565
3.04
0.0780
0.0799
-2.44
SC Aircraft & Metal Cleaner 1:100
Copper
0.6476
0.6465
0.17
0.29
0.21
0.3278
0.3274
0.12
0.6730
0.6691
0.58
Brass
0.4641
0.4633
0.17
0.22
0.6299
0.6289
0.16
0.6202
0.6181
0.34
Copper/Nickel
0.2399
0.2404
-0.21
0.12
0.2163
0.2168
-0.23
0.3046
0.3022
0.79
Micro 90 2%
Copper
0.4411
0.4428
-0.39
0.31
2.91
0.3678
0.3670
0.22
0.3929
0.3886
1.09
Brass
0.4181
0.3982
4.76
3.42
0.4263
0.4265
-0.05
0.4338
0.4098
5.53
Copper/Nickel
0.2142
0.2008
6.26
5.01
0.2233
0.2195
1.70
0.1642
0.1526
7.06
LF2100 5%
Copper
0.4177
0.4065
2.68
1.90
4.05
0.4310
0.4232
1.81
0.5168
0.5105
1.22
Brass
0.2958
0.2433
17.75
8.28
0.2123
0.1985
6.50
0.2547
0.2532
0.59
Copper/Nickel
0.1031
0.0979
5.04
1.98
0.1681
0.1672
0.54
0.1154
0.1150
0.35
Liquinox 1%
Copper
0.2711
0.2664
1.73
1.14
0.57
0.3816
0.3783
0.86
0.2878
0.2854
0.83
Brass
0.3131
0.3133
-0.06
0.20
0.2446
0.2437
0.37
0.3435
0.3425
0.29
Copper/Nickel
0.2845
0.2843
0.07
0.36
0.3207
0.3204
0.09
0.2964
0.2937
0.91
Success Rating:
Test showed little or no promise.
Conclusion:
Each cleaner was not effective in removing American Lapping Compound contaminant from copper, brass, and copper/brass (90/10) coupons. Next step will be heated immersion.
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