One cleaning chemistry was prepared according to the suppliers recommend concentration of 1:13 using DI water. The solution was heated to 105 F in a 400 mL beaker on a hot plate.
Six preweighed coupons were contaminated with the oil mixtures and weighed again. Three coupons were cleaned in the solution for five minutes using stir-bar-agitation and three were cleaned for a longer period of time (to be determined during cleaning cycle ranging from 6-10 minutes). The supplier suggested the increased cleaning time due to the nature of the product. After cleaning the coupons were rinsed in tap water at 120 F for 30 seconds and dried using a Master Appliance Corp, Hot-air gun model HG at 500 F for one minute. Final weights were recorded and cleaning efficiencies were calculated for the two cleaning times.
SUBSTRATE MATERIAL: Steel Coupons (202-1010-B79)
CONTAMINANTS: Oil: W.A Wood Co W-373 (CAS #s 64741-44-2, 64742-53-6, 64742-52-5); Castrol GTX Motor Oil SAE 10W-40 (CAS #s 64742-41-2, 64741-88-4, 64742-01-4, 64742-46-7, 64742-54-7, 64742-56-9, 64742-57-0, 64742-62-7, 64742-65-0, 72623-83-7, 72623-84-8, 72623-85-9, 72623-86-0, 72623-87-1)
CONTAMINATING PROCESS USED: The two oils were mixed together, using more of the Castrol oil. The mixed oil was then brushed onto coupons using a hand-held swab.
The ForBest product appeared to be very effective in removing most of the contaminant within the five-minute cleaning time. The second set of coupons were found to almost completely cleaned after an additional minute of cleaning. Table 1 lists the cleaning efficiencies for both cleaning times.
Table 1. Cleaning Efficiency
| Product
|
Sea Wash 700
|
| Time
|
5 min
|
6 min
|
| Coupon 1
|
82.34
|
99.91
|
| Coupon 2
|
87.25
|
98.32
|
| Coupon 3
|
94.72
|
98.84
|
| Ave
|
88.1
|
99.02
|
| Std Dev
|
6.23
|
0.81
|