To evaluate cleaners effectiveness at removing flux on graphite fixtures.
Date Run:
10/04/2019
Experiment Procedure:
Pre-contaminated graphite fixtures were provided by the company. Each of the four cells on one fixture was rated based on how contaminated they were initially and rated again after drying. The following visual rating keys were used.
Initial Visual Rating Key
#
Description
1
No contamination
2
Minimal contamination
3
Partially contaminated
4
Mostly contaminated
5
Completely contaminated
Final Visual Rating Key
#
Description
1
Completely removed
2
Mostly removed
3
Partially removed
4
Minimal removal
5
No removal
One fixture was immersed in an unheated cleaner for 15 minutes. Visual observations of the fixture and flux removal were taken every five minutes, and the fixtures were air dried with room temperature forced air for five minutes before final observations.
Trial Results:
Visual Observations:
Cleaner
5 Mins
10 mins
15 mins
Dry
1
- no visible bubbles
- clear dilution
- no change
- no change
-Flux still present, minimal removal
2
- no visible bubbles
- clear dilution
- no change
- no change
-Little to no removal
3
- no visible bubbles
- clear dilution
- no change
- no change
-No removal
4
-Bubbles on rim
- no change
-no change
-Minimal removal
5
-Bubbles on rim
- no change
- no change
-Little to no removal
6
-No change, No bubbles
- no change
- no change
-Residue left in middle
7
-Bubbles on surface
-Bubbles appearing
-Bubbles disappear
-No removal
Average Ratings:
Cleaner
Average Before Cleaning
Average After Cleaning
1
4.5
4
2
5
4.5
3
4.5
4.5
4
5
4
5
5
4.5
6
5
4.5
7
5
5
Success Rating:
Test incomplete or inconclusive.
Conclusion:
None of the cleaners were effective with unheated immersion. Next step will be to add heat to cleaners that can be heated safely without engineering controls.
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