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Trial Number 0

Trial Purpose:

To identify cleaning solutions for removing dry lubricant from nickel surfaces

Date Run:

06/02/2003

Experiment Procedure:

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.

Trial Results:

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
  0.0303 0.0097 67.99
  0.0589 0.0177 69.95
Solution 2000 0.0234 0.0158 32.48
  0.0143 0.0088 38.46
  0.0313 0.0076 75.72
SC Aircraft 0.0210 0.012 42.86
  0.0431 0.0114 73.55
  0.0167 0.0084 49.70
Daraclean 212 0.0249 0.0161 35.34
  0.0311 0.0243 21.86
  0.0179 0.0071 60.34
California Parts Washer 0.0143 0.0084 41.26
  0.0238 0.007 70.59
  0.0139 0.0098 29.50
Luminox 0.0582 0.034 41.58
  0.0422 0.0233 44.79
  0.0096 0.0088 8.33
Polyspray Jet 790 P 0.0142 0.0054 61.97
  0.0199 0.0072 63.82
  0.0123 0.0042 65.85
Biosolve 0.0076 0.0045 40.79
  0.0227 0.0142 37.44
  0.0087 0.0066 24.14

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

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.

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