To find the best fit product for cleaning Leach Garner’s #4 Master draw 419TT from aluminuml surfaces meant to resemble the cleaning of precious metals.
Date Run:
09/09/2016
Experiment Procedure:
Coupons of stainless steel and copper were selected and arranged on trays, so that each cleaner had an assigned set of each surface. Before taking initial weights coupons were wiped down with Kimwipes. After taking weights the coupons were promptly soiled and reweighed. All cleaners were gathered in respective bottles and beakers. A stir bar was used in conjunction with a heating plate equipped to stir the solutions. The coupons were added to the beakers three of a kind at one time, and then allowed to sit in the stirred solution at room temperature for 15 minutes, in 5 minute increments while observations were taken. Finally, clean weights were taken at the end of all the testing.
Trial Results:
Cleaner
Initial wt of cont.
Final wt of cont.
% Cont Removed
% Overall
FluoSolv CX
0.0609
0.0173
71.59
0.0913
0.0104
88.61
79.16
0.0515
0.0117
77.28
FluoSolv NC
0.0396
0.0074
81.31
0.0393
0.0076
80.66
81.83
0.0437
0.0072
83.52
Vertrel Sion
0.0639
0.0111
82.63
0.048
0.0093
80.63
82.79
0.0672
0.01
85.12
Solstice PF
0.0667
0.0322
51.72
0.047
0.0211
55.11
54.01
0.0529
0.0237
55.2
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
The last batch of testing associated with the Leach Garner project showed some similar results to the first time this soil was tested on copper and stainless steel. There did not seem to be much removal by any of the cleaners, as most left behind significant amounts of residue. The gravimetric values do not quite agree with what was observed, but according to the gravimetric analysis the best cleaner appeared to be DuPont’s Vertrel Sion which removed about 80% of the soil, yet it too left behind some significant residue. It did seem to dissolve the soil somewhat but after 15 minutes there were no significant changes from the first 5 minutes of cleaning. It is suggested that this particular soil be cleaned under heated conditions as unheated cleaning is quite ineffective.
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