To evaluate promising alternatives using increased operating conditions, time, temp and agitation
Date Run:
03/04/2008
Experiment Procedure:
The six products that should signs of dissolving the lacquer from the previous two trials were used at full strength, heated to 130 F in 300 ml beakers suspended in a 40 kHz Branson 2510 ultrasonic unit and degassed for 5 minutes.
Eighteen reweighed 5052 aluminum coupons were coated with the Stan Chem. Inc Red Stop Off (78-93-3, 108-88-3) lacquer using a handheld swab. The coating was allowed to dry for about an hour. Once dry, the coupons were weighed a second time to determine the amount of Red Stop Off applied. Three coupons were immersed into each solution and cleaned for 10 minutes using ultrasonic energy. Rinsing was performed for 15 seconds using tap water heated to 120 F and followed by 30 seconds of air blow off with dry compressed air at room temperature. Final weights were recorded and efficiencies were calculated for each coupon cleaned.
Trial Results:
Two products, Shipmaster RC and SC Camisole, removed over 95% of the Red Stop Off lacquer within 10 minutes of ultrasonic cleaning. Additionally, D Greuze 500 Lo removed over 90% of the lacquer if an 15 second wipe was performed following the ultrasonic cleaning. The table below lists the amount of lacquer added, the amount remaining, the calculated efficiency for each coupon cleaned and observations made.
Cleaner
Initial wt
Final wt
% Removed
Observations
Ink Zapper
0.2269
0.2587
-14.01
texture different
0.2299
0.2678
-16.49
0.4230
0.4544
-7.42
Solsafe 245
0.3710
0.4256
-14.72
visual signs of removal
0.1475
0.1861
-26.17
0.2364
0.2784
-17.77
Shopmaster RC
0.3111
0.0044
98.59
complete removal
0.2728
0.0038
98.61
0.2869
0.0079
97.25
DS 144 S
0.1894
0.2305
-21.70
visual signs of removal
0.2216
0.2630
-18.68
0.1526
0.1928
-26.34
SC Actisolv
0.1414
0.0053
96.25
complete removal
0.2530
0.0225
91.11
0.1385
0.0026
98.12
D Greeze 500 LO
0.2446
0.3749
-53.27
could be peeled off
0.2107
0.3032
-43.90
91.29% with wipe
0.3242
0.4589
-41.55
Success Rating:
Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.
Conclusion:
The top two performing products will be evaluated using room temperature immersion cleaning for an extended period of time (1 to 2 hours).
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