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To identify cleaners for the removal of second lubricant.
Four products were selected from the last project and two were submitted from client. All six products were diluted to 5% using DI water in a 600 ml beaker and heated to 140 F on a hot plate. Each solution was degassed for 5 minutes in a Crest 25 kHz ultrasonic tank.
Eighteen preweighed coupons were coated with the Atofina Copperskin 510 metal working compound (CAS#s: 64742-52-5, 123-95-5, 8016-28-2, 8002-13-9) using a hand held swab. Coupons were then weighed again to determine the amount of contaminant applied. Three coupons were cleaned in each solution for 20 seconds, followed by a 5 second tap water rinse at 140 F and dried for 10 seconds using a Master Appliance heat gun at 500 F. After cooling, coupons were weighed for a final time and efficiencies were calculated.
The four previous products were very successful in removing the lubricant from the aluminum coupons in 20 seconds. . A couple of the coupons had some oil remaining at the very top of the coupon. This was the area that was above the water line during cleaning. If the coupon had been completely submerged, this oil would probably have been removed. The two client supplied cleaners removed less than 86% of the oil. These coupons had substantial amounts of oil remaining. Unlike the previously described coupons, the oil that remained was below the water line. The following table lists the calculated efficiencies for each solution.
|Cleaners||Initial wt||Cont. wt||Clean wt.||Initial wt of cont.||Final wt of cont.||%Cont Removed||Observations|
|BCS Co||22.3480||22.6197||22.3975||0.2717||0.0495||81.78||Oil residue|
|Brulin||22.3780||22.5122||22.3869||0.1342||0.0089||93.37||oil at top|
|22.3636||22.5369||22.3734||0.1733||0.0098||94.35||oil at top|
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
The four successful cleaners will be used under the proposed operating conditions of 2, one second cleaning and 1, one second rinsing stages. The supplied silver tape will be lightly coated with the lubricant and analyzed using OSEE.