Trial #3
To determine the minimum cleaning time at increased concentrations.
Eighteen preweighed coupons were contaminated with oil using a hand held swab and then weighed. Two cleaning solutions were made into 15% solutions using DI water in a 600 mL beaker. The solutions were heated to 130 F on a hot plate. The beakers were then placed into a Crest 40 kHz ultrasonic tank model 4Ht 1014-6 also at 130 F. Three coupons were placed in each cleaner for a set cleaning time. These cleaning times were 15, 30 and 60 seconds. Coupons were rinsed in tap water at 120 F for 30 seconds and air dried. Final weights were taken after drying was complete.
SUBSTRATE MATERIAL: Copper/Nickel 70/30
CONTAMINANTS: Oil-Castrol 10W-40
Both chemistries had good results for the all cleaning times. Table 1 list the cleaning efficiencies for both cleaners at the 3 cleaning times.
Table 1. Cleaning Efficiencies at Various Intervals
|
|
AK-6215
|
Daraclean 282
|
| Time
|
15
|
30
|
60
|
15
|
30
|
60
|
| Coupon 1
|
87.36
|
89.57
|
93.35
|
92.36
|
95.22
|
90.64
|
| Coupon 2
|
90.27
|
97.45
|
79.11
|
96.52
|
97.43
|
96.15
|
| Coupon 3
|
94.48
|
97.11
|
100.80
|
98.12
|
96.53
|
94.33
|
| Ave
|
90.70
|
94.71
|
91.09
|
95.67
|
96.39
|
93.71
|
| Std Dev
|
3.58
|
4.45
|
11
|
2.97
|
1.11
|
2.81
|
The increased concentration has allowed the cleaning times to be decreased to under 1 minute. The next testing will be performed using the second oil supplied by the client.
No relation