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Trial Number 1

Client Number 79

Project Number 1

Trial Purpose:

To identify cleaning equipment that will aid the aqeuos cleaners in the removal of oil from metal tape.

Date Run:

08/26/1998

Experiment Procedure:

Two cleaners were selected from the previous trial. Five percent solutions were made using DI water in 400 mL beakers. The beakers were placed into a 40 kHz Crest ultrasonic unit and heated to 130 F.
Six preweighed coupons were contaminated with the oil using hand held swabs. Contaminated weights were recorded for each coupon. Three coupons were placed into each solution and cleaned for 5 minutes using ultrasonic energy. Coupons were rinsed in tap water at 120 F for 30 seconds. Drying was performed using a Master Appliance Heat Gun model HG-301A for about 30 seconds and then air dried for 1 hour. Final clean weights were made and the percent removal of the oil was calculated.

SUBSTRATE MATERIAL: Copper/Nickel 70/30 coupons
CONTAMINANTS: Oil-Castrol 10W-40

Trial Results:

Both cleaners had excellent removal of the oil when used with the ultrasonic cleaning equipment. The Daraclean solution had slightly lower efficiency than the AK-6215. During cleaning in the Daraclean, two of the coupons piled up on top of each other, thus lowering the effectiveness of the cleaner. The third coupon had 99.1% of the oil removed where as the other two coupons had 93.4 and 95.5% removal. Table 1 lists the cleaning efficiencies of both cleaning solutions.
Table 1. Cleaning Efficiency

  Ak 6215 Daraclean
Coupon 1 98.5 99.1
Coupon 2 99.8 93.4
Coupon 3 99.4 95.5
Ave 99.2 96
Std Dev 0.666 2.88

Success Rating:

A follow up test, usually based on company input.

Conclusion:

Both cleaning solutions were very effective in removing the oil when used in conjunction with a 40 kHz ultrasonic tank.  Further testing of both chemistries will be performed in order to decrease the cleaning time.

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