To evaluate additional cleaners for the removal of the chemical vapor deposition
Date Run:
12/12/2001
Experiment Procedure:
Five solutions were selected based on meeting the following parameters:
System Requirements, high and low pressure spray wash
Contaminants: Salts or silicones Four solutions were diluted to 20% with DI water in 1000 ml beakers. The fifth product was used at full strength. All five were heated to 140 F on a hot plate. One part was immersed in each solution and cleaned 20 minutes. Observations were made at 5 minute intervals. At the end of cleaning, the parts were rinsed in a tap water spray for 1 minute at 120 F. Parts were wiped dry and observed visually for cleanliness.
Trial Results:
The Buckeye Shopmaster LpH worked very well on the grey, black contaminant as well as the rust. The product was also moderately effective removing the white powders. The MacDermid ND LF Supreme worked very well on removing the rust but not very well on the white powders. The other three products were not effective on the white powders. The following table lists the observations made at 5 minute intervals.
Table 1. Observations
Cleaner
Observations
1
0-
some dissolving
fair
5-
cloudy
fair/okay
10-
more removal
okay
15-
very cloudy
okay/good
20-
wipe off black
okay/good
2
0-
little/no dissolving
poor/fair
5-
some dissolving
fair
10-
removing rust film
fair/okay
15-
okay
20-
wipe off rust
okay
3
0-
little/no dissolving
poor/fair
5-
some dissolving
fair
10-
no change
fair
15-
no change
fair
20-
no change
fair
4
0-
little/no dissolving
poor/fair
5-
teflon coming off
fair
10-
rust color in solution
fair/okay
15-
still has white on
fair/okay
20-
fair/okay
5
0-
little/no dissolving
poor/fair
5-
little/some dissolving
poor/fair
10-
little/some dissolving
poor/fair
15-
no change
poor/fair
20-
no change
poor/fair
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Due to the design of the parts and the difficult nature of the contamination, ultrasonic cleaning should provide the extra cleaning that the spray cleaning is not achieving. A quick check of the Shopmaster LpH in an ultrasonic cleaner showed improved cleaning effectiveness in less time.
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