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To evaluate cleanliness using OSEE of a series of parts that have been cleaned with different processes.
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).
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
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|
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.
OSEE was shown to be an effective analysis method in comparing the various cleanliness of the 13 supplied parts.