To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using unheated immersion.
Date Run:
05/23/2023
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 intial 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 immersion. The coupons were immersed for 15 minutes with a stir bar set to 200 rpm. The coupons were then removed and left to dry overnight. The next morning clean weights were recorded.
Trial Results:
Cleaner
Soil
Substrate
Initial wt
Dirty wt
Clean wt.
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
SB-33
Hocut 795
Stainless Steel
59.0069
59.0317
59.0122
0.0248
0.0053
78.63
73.09
79.61
Stainless Steel
60.3367
60.3888
60.3418
0.0521
0.0051
90.21
Stainless Steel
63.8959
63.9072
63.9015
0.0113
0.0056
50.44
RI 780
Stainless Steel
63.9891
64.0096
63.993
0.0205
0.0039
80.98
86.12
Stainless Steel
63.8677
63.8856
63.8679
0.0179
0.0002
98.88
Stainless Steel
59.9843
60.0029
59.9883
0.0186
0.0040
78.49
SB-31
Hocut 795
Stainless Steel
58.9639
59.0367
59.0014
0.0728
0.0375
48.49
38.64
68.95
Stainless Steel
60.088
60.1232
60.1211
0.0352
0.0331
5.97
Stainless Steel
59.1426
59.2225
59.1734
0.0799
0.0308
61.45
RI 780
Stainless Steel
60.2134
60.242
60.2179
0.0286
0.0045
84.27
99.27
Stainless Steel
60.1841
60.214
60.1874
0.0299
0.0033
88.96
Stainless Steel
49.5706
49.5942
49.5648
0.0236
-0.0058
124.58
SB-33 was able to completely air dry overnight. SB-31 did not air dry overnight and left pools of solvent on the coupons. The final weights of these coupons include the weight of the left over solvent. This means that SB-31 would most likely be effective with a drying step.
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 was successful in removing both soils from the coupons using unheated immersion. SB-31 was successful in removing RI 780 from the coupons using unheated immersion. It was not successful in removing Hocut 795 from the coupons using unheated immersion.
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