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Trial Number 1

Trial Purpose:

To evaluate the effectiveness of four cleaners at an increased concentrations in the removal of the buffing compound.

Date Run:

03/29/1999

Experiment Procedure:

The four cleaners from the previous trial were made into 10% solutions by volume in 400 mL glass beakers and heated to 130 F on a hot plate.
Preweighed coupons were contaminated with a buffing compound and weighed again. Three coupons were cleaned for 5 minutes in a beaker using stir bar agitation. Coupons were rinsed in tap water at 120 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: Brass Coupons
CONTAMINANTS: Buffing Compound (Anchor Chemical Co, Anchor Spin G-10)
CONTAMINATING PROCESS USED: Compound rubbed onto coupons

Trial Results:

All four chemistries were determined to remove the buffing compound from the coupons using the increased cleaner concentration. Table 1 lists the cleaning efficiencies for each cleaner.

Table 1. Cleaning Efficiencies

Cleaner Calgon Oakite US Polychem Chrisal
Coupon 1 100.24 100.9 94.1 94.2
Coupon 2 100.4 100 91.47 100.87
Coupon 3 100.21 101.38 97.18 95.08
Ave 100.28 100.76 94.25 96.72
Std Dev 0.1 0.7 2.86 3.63

Table 2 compares the average cleaning efficiencies from the previous trial with the average cleaning efficiencies from this trial.
Table 2. Comparison of 5% and 10% Cleaning Solutions

Cleaner Calgon Oakite US Polychem Chrisal
  5% Ave 99.76 98.39 55.89 71.51
10% Ave 100.28 100.76 94.25 96.72

Success Rating:

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

Conclusion:

Increasing the concentration of the cleaners was found to improve the cleaning efficiencies of all four cleaners tested.  An additional study will be conducted using the 5% solutions and ultrasonic energy.

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