There were two goals for this trial, first, to test the effectiveness of MacDermid ND-17 for Plating Job Shop's needs. The second was to determine to most effective way to reduce wax drag out from the cleaning bath. For each substrate three different methods of removing the coupons from the cleaner bath was used. The first method (removal #1) was to quickly remove the coupons while the air sparging was still activated. The second method (removal #2) was to turn off the air sparging and then quickly remove the coupons. The final method (removal #3) was to keep the coupons in the solution after cleaning and allowing the solution to cool until the wax solidified and could easily be skimmed off the top.
Parts were weighed before and after contamination. Cleaning in the air sparged beaker would last for 20 minutes at 160 F. Rinsing was performed for 5 minutes in a tap water bath at 160 F. The coupons were then dried under air knives for two minutes and then placed in a convection oven set at 120 F for 90 minutes. The coupons were then allowed to cool for 2 hours and weighed once again. To minimize the time of the trial, all 24 coupons were cleaned in a total of eight beakers. 3 coupons of the same material were used in each beaker. In each beaker 2 coupons were removed with either method #1 or #2 while the third coupons was removed with method #3.
Trial Results:
SURFACE CLEANING LAB
GRAVIMENTRIC ANALYSIS
sample # and substrate
removal method
clean mass (g)
mass with contamination (g)
mass after cleaning (g)
contaminant removed (g)
Percent Removal
61 - Steel
1
188.5192
190.6576
188.5282
2.1294
99.58%
65 - Steel
1
221.6276
223.9264
221.6356
2.2908
99.65%
16 - Steel
2
172.9255
174.9124
172.9260
1.9864
99.97%
28 - Steel
2
146.6684
148.3150
146.6696
1.6454
99.93%
1 - Steel
3
166.8401
168.4727
166.8416
1.6311
99.91%
5 - Steel
3
186.0529
188.1641
186.0515
2.1126
100.07%
16 - Al
1
21.0087
22.3233
21.0143
1.309
99.57%
17 - Al
1
21.0274
22.3866
21.0320
1.3546
99.66%
13 - Al
2
20.9922
22.4662
21.0001
1.4661
99.46%
15 - Al
2
20.9727
22.5154
20.9849
1.5305
99.21%
14 - Al
3
21.0111
22.4593
21.0181
1.4412
99.52%
18 - Al
3
21.0122
22.2181
21.0139
1.2042
99.86%
3579 Cu
1
35.3583
36.6686
35.3628
1.3058
99.66%
3988 Cu
1
35.3999
36.3755
35.4007
0.9748
99.92%
5096 Cu
2
35.5109
36.3669
35.5348
0.8321
97.21%
5581 Cu
2
35.5584
36.3573
35.5627
0.7946
99.46%
3545 Cu
3
35.3558
36.0879
35.3602
0.7277
99.40%
4076 Cu
3
35.4079
36.4492
35.4093
1.0399
99.87%
5251 Brass
1
34.5273
35.4646
34.5266
0.938
100.07%
6577 Brass
1
34.6592
35.5675
34.6580
0.9095
100.13%
The ND-17 did not create a lot of foam even under intense agitation. Removal was alight, just as good as the Daraclean 283 but not nearly as good as the Daraclean 294xx. The ND-17 would not be a desirable due to the intense discoloration of the brass coupons.
Success Rating:
Test showed little or no promise.
Conclusion:
Some recommendations for further trials would be to test several cleaners (Oakite 3800, Oakite 4000T, Calgon Geo-Guard 5210, and Chemtech CT-1), to find a chemistry that is compatible. Some sort of agitation should be used on the rinse tank. The temperature of the rinse and the cleaner tank must be over 140 F so that the wax melts but a slightly lower temperature of 150 might be tried to minimize the possibility of etching onto brass.
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