Browse past lab clients by general industry sectors
To further evaluate cleaners using ultrasonic energy in conjunction with effective cleaners.
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.
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|
Success Rating:Results suggest a scale-up feasible match for cleaning chemistry and equipment. Pilot plant study with actual parts recommended.
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.