To evaluate cleanliness using OSEE of a series of parts that have been cleaned with different processes.
Date Run:
05/05/2003
Experiment Procedure:
Thirteen supplied parts were analyzed using a Photo Emission Tech. Inc Surface Quality Monitor SQM 100. Five readings were made on one side from each of the 13 parts submitted for analysis.
OSEE: Optically Stimulated Electron Emission or PEE, Photo Electron Emission is based on the principle that metals and certain surfaces emit electrons upon illumination with ultraviolet (UV) light. These electrons can be collected, measured as current, converted to a voltage and digitally displayed. A surface contaminant will enhance or attenuate this signal, depending on it own photoemissive nature. While OSEE will not identify a contaminant, it is a good comparative tool to determine the degree of contamination. This method is best suited for thin films (oils, etc.) and not particulate matter (dust, for example).
Trial Results:
Standard cleaning with Oakite Inproclean 1300 at 5% with ultrasonics and two rinse baths at 8 feet per minute rate. Non standard cleaning with Oakite Inproclean 1300 at 5% with ultrasonics and two rinse baths at 4 fpm rate.
Part # Group
1 Standard cleaning
2 Standard cleaning + isopropyl wipe
3 Standard cleaning + Reno 12 applied (dirty)
4 Standard cleaning + C510 applied (dirty)
5 Standard cleaning + electroclean
6 Standard cleaning + acid etch
7 Standard cleaning + K2SO4 applied (dirty)
8 Nonstandard cleaning
9 Electroclean 11 As drawn, no cleaning (dirty)
5A, 6A & 9A same as 5, 6 & 9 with the addition of vacuum process.
Part #
Reading 1
Reading 2
Reading 3
Reading 4
Reading 5
Average
Std Dev
1
794
846
673
676
482
694
126
2
1004
1002
1003
1006
1000
1003
2
3
122
128
141
131
115
127
9
4
97
112
102
104
107
104
5
5
991
1000
1001
1003
1002
999
4
6
779
359
710
852
1001
740
214
7
142
144
120
137
115
132
12
8
1000
1000
619
522
729
774
196
9
116
146
133
425
253
215
116
11
98
87
80
88
95
90
6
5A
980
987
989
984
984
985
3
6A
984
983
986
982
987
984
2
9A
985
993
991
987
985
988
3
Method 2 was found to have the highest average OSEE reading (1003), followed by method 5 (999). The three processes subjected to the vacuum after cleaning resulted in nearly the same readings (5A-985, 6A-984 and 9A-988).
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
OSEE was shown to be an effective analysis method in comparing the various cleanliness of the 13 supplied parts.
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