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To further evaluate potential cleaners using ultrasonic energy.
Seven cleaning chemistries were selected based on the previous trial results. Five of these products were diluted to five percent and one to two percent by volume in 600 ml beakers using DI water. These six solutions were heated to 130 F on a hot plate. The seventh product was used at full strength at room temperature. Table 1 lists the products evaluated. Twenty-one preweighed stainless steel coupons were coated with the buffing compound and dried for 30 minutes at room temperature and weighed again. (Note: The six contaminants provided were sub-grouped according to their make up. There were three Aluminum Oxide based buffing compounds, two mineral oil based products and one other. Separate testing will be performed according to these classifications.)
Three coupons were cleaned for three minutes in a beaker using a Crest 40 kHz ultrasonic tank model 4Ht 1014-6. Coupons were rinsed in DI water at 130 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG-301A at 500 F for one minute. After the coupons cooled to room temperature, a final clean weight was recorded and cleaning efficiencies were calculated.
SUBSTRATE MATERIAL: Stainless steel coupons (202-316 B-80)
CONTAMINANTS: Snowden-Pencer F-26 Grease Stick Polishing Lubricant (CAS#s: 64742-52-5, 68815-16-7, 67701-27-3, 102-71-6)
CONTAMINATING PROCESS USED: Coupons covered with contaminant and air dried for 30 minutes.
The six aqueous based products worked well in conjunction with the ultrasonic energy. It was noted that the cleaners required the full three minutes to remove the contaminant from the coupons. Table 2 lists the cleaning efficiencies for all seven products.
Table 2. Cleaning Results
|Cleaner:||Safe Science||Oakite||Texo Corp||US Polychem||Valtech||WR Grace||International|
Success Rating:A follow up test, usually based on company input.
The six aqueous products removed 98-100% of the contaminant using ultrasonic energy. These six will be used on the last type of contaminant and then on supplied parts.