The dirty brass parts were analyzed using OSEE prior to cleaning. Parts were configured so that the inside diameter were directly under the light source of the instrument. The highest number obtained was recorded. Parts were randomly selected from the lot provided to the lab. Surfaces subjected to ultraviolet (UV) light at the proper wavelength (energy), emit electrons under certain conditions. The process by which UV photons interact with the surface to excite electrons is known as OSEE. These emitted electrons are collected across an air gap by a biased collector and measured as a current which then is converted into a displayed voltage. Any contamination or thin film on the surface can either enhance or lessen the inherent emission. OSEE can be used as a quick non-destructive, non-contact method to help establish a quantitative measure of surface cleanliness.
Samples were cleaned using MacDermid ND-17 in rotational energy. A 15% by volume cleaning solution was made and heated to 160 F. Cleaning lasted 5 minutes. Parts were rinsed with tap water at 120 oF for 30 seconds. Parts were dried using a Master Appliance Corp. Hot-air gun model HG-301A for 2 minutes. After cooling to room temperature, the parts were analyzed again with OSEE.
SUBSTRATE MATERIAL: Brass parts CONTAMINANTS: Water Soluble Oil
Trial Results:
Dirty and clean readings from the inside of the parts are listed in Table 1. Table 1 OSEE Readings of Brass parts
Dirty
Clean
1321
1282
1351
1280
1296
1283
1293
1283
1282
1284
1352
1283
1334
1287
1339
1284
1321
1283
Average
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
The level of cleanliness obtained from the aqueous cleaner should now be compared to the TCE method. In order to ensure consistent results, new samples need to be obtained from the client. Three sets of parts are required: Dirty, cleaned with TCE (at client’s facility) and the final cleaned with the aqueous cleaner (also at client’s facility). Other areas of concern for the client to look into:
How full is the container holding the parts?
If the container is completely filled, the parts would not be free to move around to allow all the parts to be exposed to the cleaner. This would decrease the ability of the cleaner to get into the inside of the parts.
If the container is only filled 3/4 of the way, and a tumbling action is used, more parts would be exposed to the cleaner resulting in cleaner parts. If the outside of the parts is being cleaned well enough to be plated, the aqueous cleaner should be able to remove the oil from the inside of the parts.
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