Trial #1
To evaluate the effectiveness of four cleaners at an increased concentrations in the removal of the
buffing compound.
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
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
|
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.
No relation