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Trial Number 1

Trial Purpose:

Evaluate ultrasonics to remove rosin solder flux

Date Run:

06/25/1995

Experiment Procedure:

The purpose of this trial is to determine the effectiveness of two cleaners using ultrasonics to remove rosin solder flux from some delicate circuit parts for Electrical Manufacturer.
Cleaning will take place in the Crest Ultrasonic unit for 15 minutes at 130 F. Rinsing will be performed in a tap water rinse for 2 minutes and a DI rinse for a few seconds. The temperature both rinse baths was 140 F.
The parts were weighed before and after cleaning to determine the amount of contaminant removed for each part. The parts were also visually inspected for any residual flux after cleaning.
SUBSTRATE MATERIAL: Gold-Coated Aluminum
CONTAMINANTS: Rosin solder flux
CONTAMINATING PROCESS USED: received contaminated

Trial Results:

Trial #1- Some water spotting on part #2. Other than that, cleaning was excellent on both parts, all flux was removed.

Trial #2- There was a small amount of flux on part #1 (before cleaning there was al ot of flux on this area, a longer cleaning time would do the trick). There was some water spotting on part #3. Both parts looked very clean.
GRAVIMENTRIC ANALYSIS

sample # mass with contamination (g) mass after cleaning (g) contaminant removed (g)
#1 133.9745 133.8088 0.1657
#3 17.3736 17.2805 0.0931
#2 133.8106 133.7233 0.0873
#4 17.3723 17.3076 0.0647

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

Both cleaners seemed to work alright.  Might want to bump up the cleaning time by 5 minutes just in case the parts are heavily soiled like part #1 was.  Slight problem of spotting.  This could be solved by using just a DI rinse and drying the parts a little bit faster (high temperature in a convection oven.