The coupons were weighed prior to contamination and then dipped in melted wax. Once the wax hardened the coupons were then weighed again. Cleaning was done in a beaker at 160 F with air sparging used as agitation. The copper coupons were washed for 15 minutes but it was noted that a longer cleaning time was necessary, so the time was bumped up to 20 minutes. The coupons were then rinsed for 5 minutes in a tap water rinse at 160 F. Drying was performed by running the coupons under air knives for two minutes and then placing the coupons in a convection oven set at 125 F for 90 minutes. The coupons were then left out overnight to cool down and then weighed in the morning. Four runs were performed for the Daraclean 283 (one run for each substrate).
Trial Results:
EXPERIMENTAL DATA LOG
GRAVIMENTRIC ANALYSIS
sample # and substrate
clean mass (g)
mass with contamination (g)
mass after cleaning (g)
contaminant removed (g)
Percent Removal
#8 Aluminum
21.0186
21.8746
21.0205
0.8541
99.78%
#9 Aluminum
21.0070
21.8466
21.0193
0.8273
98.54%
#10 Aluminum
20.9878
21.7173
20.9955
0.7218
98.94%
#2954 Copper
35.2962
36.0450
35.3054
0.7396
98.77%
#3093 Copper
35.3100
36.0492
35.3125
0.7367
99.66%
#3932 Copper
35.3942
36.0962
35.4075
0.6887
98.11%
#5330 Brass
34.5341
35.2604
34.5357
0.7247
99.78%
#7399 Brass
34.7371
35.4442
34.7422
0.702
99.28%
#5881 Brass
34.5893
35.2998
34.5928
0.707
99.51%
#15 Steel
163.8808
165.0326
163.8844
1.1482
99.69%
#11 Steel
139.7609
141.0213
139.7640
1.2573
99.75%
#36 Steel
147.5389
148.6627
147.5427
1.12
99.66%
For the first run the Daraclean 283 removed a majority of the wax, however there was a thin film of wax on the copper coupons. Thus the cleaning time was bumped up to 20 minutes. Removal was pretty good (except for the Aluminum which had a lot of wax on it), but not as good as the Daraclean 294xx.
Success Rating:
Test incomplete or inconclusive.
Conclusion:
A higher temperature would probably be the best bet to improve cleaning but this might not be a good idea due to safety reasons. A method needs to be devised to remove the wax from the top of the cleaning tank.
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