Trial Purpose:
To further evaluate cleaners using ultrasonic energy in conjunction with effective cleaners.
Date Run:
11/03/1999Experiment Procedure:
Four products were selected based on the previous testing performed for the client. All four cleaners were diluted to 5% using DI water in 400 ml glass beakers. Two were also made into a 10 and 100% solution. All products were heated to 130 F on a hot plate. Table 1 lists the products evaluated and the corresponding concentrations.
Eighteen preweighed coupons were coated with the flux and heated to 100 F for one hour in an oven. After cooling to room temperature, a second weighing was performed to determine the amount of contamination present on each coupon. The cleaning solution was placed in a Crest 40 kHz ultrasonic tank model 4Ht 1014-6 filled with water heated to 130 F and degassed for five minutes. Three coupons were placed into the suspended beaker and cleaned for five minutes. Coupons were rinsed in DI water at 130 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for 30 seconds. Once the coupons returned to room temperature, final clean weights were recorded and cleaning efficiencies were calculated.
SUBSTRATE MATERIAL: Brass Coupons 260
CONTAMINANTS: Kester Solder 1544 Rosin Flux-(Ethanol CAS#64-17-5;2-Butanol CAS#78-92-2*;Modified Rosin CAS#8050-09-7)
CONTAMINATING PROCESS USED: Coupons coated using hand-held swab and then dried in an oven at 100 F for one hour.
Trial Results:
The use of ultrasonic energy greatly increased the efficiencies of all the solutions tested. Only one solution, Bio-T at 5% dilution had an efficiency lower than 95%. Table 2 lists the results for each cleaner and concentration.
Table 2. Cleaning Effectiveness
| Armakleen | Safey Wash 5 | SW 10 | Bio-T 5 | Bio-T 100 | Inproclean | |
| Coupon 1 | 100.06 | 97.58 | 99.85 | 71.97 | 100.09 | 100.27 |
| Coupon 2 | 100.00 | 91.38 | 100.00 | 44.69 | 100.00 | 95.61 |
| Coupon 3 | 99.76 | 96.47 | 99.61 | 18.37 | 100.22 | 99.78 |
| Average | 99.94 | 95.14 | 99.82 | 45.01 | 100.10 | 98.55 |
Success Rating:
Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.Conclusion:
All of the products tested were very effective in removing nearly all of the flux from the coupons. The increased concentrations for Safety Wash CRC and Bio-T 300 B proved to be as effective as the Armakleen and Inproclean 4000 T at 5%. These four solutions will be used to clean the supplied client parts.
