To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using heated immersion.
Date Run:
05/25/2023
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 heated immersion. The coupons were immersed for 15 minutes with a stir bar set to 200 rpm at a temperature of 130 F. 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
0.0890
0.0017
98.09
96.85
92.84
Stainless Steel
0.0482
0.0037
92.32
Stainless Steel
-0.4185
0.0006
100.14
RI 780
Stainless Steel
0.0282
0.0026
90.78
88.82
Stainless Steel
0.0320
0.0061
80.94
Stainless Steel
0.0286
0.0015
94.76
SB-31
Hocut 795
Stainless Steel
0.1144
0.0151
86.80
84.73
86.06
Stainless Steel
0.1247
0.0194
84.44
Stainless Steel
0.0721
0.0123
82.94
RI 780
Stainless Steel
0.0403
0.0008
98.01
87.38
Stainless Steel
0.0301
0.0091
69.77
Stainless Steel
0.0515
0.0029
94.37
The coupons associated with solvent SB31 were still partially wet 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:
Both SB-33 and SB-31 are effective in removing oil and grease from stainless steel coupons using heated immersion. SB-31 may need a drying application after cleaning in order to be used in a company application.
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