To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using heated ultrasonics.
Date Run:
06/01/2023
Experiment Procedure:
Two solvents were identified previously using the Hspip software; SB-33 (D-limonene 85% +Dimethyl glutarate 15%) and SB-31 (Benzyl alcohol 63% + Ethyl lactate 37%). Twelve stainless steel coupons were chosen and initial weights of each were recorded. Half of the coupons were soiled with Hocut 795 and half were soiled with RI-780. The soils were applied to the bottom third of each coupon using a swab. The coupons were then cleaned by their respective solvent using a method of heated ultrasonics. The coupons were immersed and subjected to ultrasonics agitation for 15 minutes at 130 degrees Farenheit. The coupons were then removed and left to dry overnight. (Coupons dried for a week before weights were taken). Clean weights were recorded.
Trial Results:
Cleaner
Soil
Substrate
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
SB-33
1
Stainless Steel
0.0191
0.0038
80.10
88.20
0.88
Stainless Steel
0.0374
0.0040
89.30
Stainless Steel
0.0729
0.0035
95.20
2
Stainless Steel
0.0279
0.0012
95.70
87.63
Stainless Steel
0.0453
0.0042
90.73
Stainless Steel
0.0204
0.0048
76.47
SB-31
1
Stainless Steel
0.1060
0.0016
98.49
98.98
0.96
Stainless Steel
0.1202
0.0006
99.50
Stainless Steel
0.0662
0.0007
98.94
2
Stainless Steel
0.0284
0.0004
98.59
93.19
Stainless Steel
0.0123
0.0016
86.99
Stainless Steel
0.0100
0.0006
94.00
Coupons were left for a week after cleaning and were able to airdry during that time
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
SB-33 is an effective solvent in removing the soils from stainless steel coupons using heated ultrasonics. SB-31 is an effective solvent in removing the soils from stainless steel coupons using heated ultrasonics.
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