Cleaners were prepared to the following concentrations: Metalnox 6386 100%, Dimethyl Glutarate 100%, Ozzy Juice SW-3 100%, SC Aircraft and Metal Cleaner 20%, SC Supersolve 20%, Crystal Simple Green Industrial 30 parts water. Ozzy Juice SW-3, SC Aircraft & Metal, and SC Supersolve were heated to 100°F. Three aluminum coupons were obtained and weighed for each of the cleaners being tested. Coupons were then soiled with V-4B oil and a dirty weight was recorded. Once solutions reached the proper temperature, coupons were submerged into their respective cleaners for 15 minutes. After 15 minutes, coupons cleaned with SC Aircraft & Metal and SC Supersolve were rinsed in a heated deionized water bath, also at 100°F, for 30 seconds. All coupons were then dried with a heat gun to remove excess solution and finished drying in air for 24 hours. Following the drying process, coupons were weighed again, and a clean weight was recorded. Effectiveness of the cleaners was then determined.
| Cleaner
|
Initial wt of cont
|
Final wt of cont
|
%Cont Removed
|
%AVG
|
| Metalnox 6386
|
0.0090
|
-0.0013
|
114.44
|
114.56%
|
| 0.0061
|
-0.0010
|
116.39
|
| 0.0070
|
-0.0009
|
112.86
|
| Dimethyl Glutarate
|
0.0056
|
-0.0010
|
117.86
|
115.08%
|
| 0.0055
|
-0.0010
|
118.18
|
| 0.0087
|
-0.0008
|
109.20
|
| Ozzy Juice SW-3
|
0.0040
|
0.0024
|
40.00
|
43.47%
|
| 0.0047
|
0.0028
|
40.42
|
| 0.0038
|
0.0019
|
50.00
|
| SC Aircraft & Metal
|
0.0043
|
-0.0009
|
120.93
|
129.64%
|
| 0.0050
|
-0.0009
|
118.00
|
| 0.0040
|
-0.0020
|
150.00
|
| SC Supersolve
|
0.0047
|
-0.0029
|
161.70
|
172.86%
|
| 0.0033
|
-0.0023
|
169.70
|
| 0.0039
|
-0.0034
|
187.18
|
| Crystal Simple Green Industrial
|
0.0028
|
-0.0011
|
139.29
|
127.53%
|
| 0.0066
|
-0.0005
|
107.58
|
| 0.0014
|
-0.0005
|
135.71
|
Many of the cleaners tested performed over 100% removal. SC Supersolve was the only cleaner to show visual damage of the coupon. There was a distinctive dark line between the cleaned area and the uncleaned area following the rinse step. The damage to the coupon could have been caused by the rinse step which another test of SC Supersolve without a rinse could verify. The performance of Ozzy Juice decreased compared to the unheated trial and will be dropped from further testing. The performance of SC Aircraft significantly increased with heated immersion and a rinse step. However, it is unknown as to why the percent removals all exceed 100. There is the potential that cleaners are still removing soils embedded in the coupons from previous experiments. Though the cleaners should all be compatible with aluminum substrates, a verification of compatibility would be beneficial.
Upon completion of testing, it was determined that all cleaners excluding Ozzy Juice SW-3 were successful at removing the oil. However, cleaners performed consistently above 100%. Further optimization is required for SC Supersolve to determine if the rinse step was the cause of damage to the substrate. Additional compatibility testing is required for the remaining cleaners.