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To identify cleaning solutions for removing dry lubricant from nickel surfaces
Eight products were selected from the laboratory's databases based on client supplied information. Seven of the eight were diluted to 5% and the eighth was diluted to 20%. All were diluted with DI water in 600 ml beakers. Solutions were heated to 125 F on a hot plate.
Twenty-four preweighed coupons were coated with the Metalube Corp ML-119.2 dry lubricant (Molybdenum disulfide, graphite, silicates) using a hand held swab. Coupons were allowed to sit for 30 minutes and weighed again to determine the amount of lubricant applied. Three coupons were cleaned in each solution for five minutes using stir-bar agitation. Coupons were rinsed for 15 seconds in tap water at 120 F and dried using a Master Appliance Heat Gun for 30 seconds at 500 F. The coupons were then allowed to cool to room temperature and weighed a final time. Efficiencies were calculated for each product.
A couple of the cleaners removed over 60% of the lubricant using immersion cleaning. A third product removed over 55%. The other five products removed less the 48%. The table below shows the amount of soil added and removed for each coupon cleaned.
|Cleaner||Initial wt||Final wt||% Removed|
|Formula 815 GD||0.0300||0.0087||71.00|
|California Parts Washer||0.0143||0.0084||41.26|
|Polyspray Jet 790 P||0.0142||0.0054||61.97|
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Immersion cleaning had little effect on the dry lubricant. Ultrasonic energy will be attempted next with the most effective products. Additional products will also be selected for testing.