To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using unheated ultrasonics.
Date Run:
05/31/2023
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 unheated ultrasonics. The coupons were immersed and subjected to ultrasonics agitation for 15 minutes . The coupons were then removed and left to dry overnight. The next morning clean weights were recorded.
Trial Results:
Cleaner
Soil
Substrate
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
SB-33
Hocut 795
Stainless Steel
0.0351
0.0098
72.08
87.75
84.25
Stainless Steel
0.1139
0.0062
94.56
Stainless Steel
0.2239
0.0076
96.61
RI 780
Stainless Steel
0.0405
0.0060
85.19
80.75
Stainless Steel
0.0371
0.0072
80.59
Stainless Steel
0.0238
0.0056
76.47
SB-31
Hocut 795
Stainless Steel
0.1013
0.0677
33.17
52.37
61.64
Stainless Steel
0.3055
0.0712
76.69
Stainless Steel
0.1693
0.0893
47.25
RI 780
Stainless Steel
0.0399
0.0149
62.66
70.91
Stainless Steel
0.0419
0.0173
58.71
Stainless Steel
0.0370
0.0032
91.35
The coupons associated with solvent SB-31 had pools of solvent remaining after being left to air dry overnight.
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 unheated ultrasonics. SB-31 is not and effective solvent in removing the soils from stainless steel coupons using unheated ultrasonics. SB-31 may prove to be more effective with an added drying step after the cleaning application.
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