To evaluate the effectiveness of a FAME + Methyl Lactate mixture in removing several production oils and greases from stainless steel coupons as a potential replacement for TCE using unheated immersion.
Date Run:
03/22/2023
Experiment Procedure:
Three stainless steel coupons were used for each of the five soils being tested for a total of 15 coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the corresponding soil with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected to unheated immersion cleaning in a solution of Fatty Acid Methyl Ester 93% + Ethyl Lactate 7% for 15 minutes, with a stir bar set to 200 rpm. After the coupons were cleaned, they were left to air dry overnight. The next morning, the clean weights of each coupon were taken.
Soil
Use
CAS
Milform OAK 7a International
Stamping and drawing fluid
64742-53-6 / 68909-65-9
Milform Oak 529
Evaporative lubricant
68551-17-7 / 123-95-5 / 127087-87-0
Milform Oak 15a
Metalworking oil
64742-44-5 / 64742-52-5 / 64742-55-8
Milform Oak 15c
Metalworking oil
64742-52-5 / 64742-53-6
M4
Trial Results:
Solvent
Substrate
Soil
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
Fatty Acid methyl ester 93% + Ethyl lactate 7%
Stainless Steel
Oak 7a international
0.0617
0.0443
28.20
46.43
7.20
Oak 7a international
0.0718
0.0430
40.11
Oak 7a international
0.0617
0.0179
70.99
M4
0.4885
0.0139
97.15
90.26
M4
0.7935
0.1424
82.05
M4
0.7030
0.0592
91.58
Oak 15C
0.0886
0.0604
31.83
15.74
Oak 15C
0.0836
0.0706
15.55
Oak 15C
-0.9347
-0.9363
-0.17
Oak 15A
0.1667
0.0632
62.09
62.06
Oak 15A
0.1776
0.0821
53.77
Oak 15A
0.1617
0.0480
70.32
Oak 529
0.0134
0.0708
-428.36
-178.51
Oak 529
0.0075
0.0064
14.67
Oak 529
0.0197
0.0437
-121.83
After being allowed to air dry over night, it was observed that the coupons were still completely wet the next morning. The FAME + Methyl Lactate solution was unable to air dry, which is reflected in these measurements. In some cases, a larger amount of cleaner remained on the coupon than the amount of soil it removed, leading to a heavier clean weight than dirty weight for particular coupons.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
In the application of unheated immersion with an air drying overnight period, Fatty Acid Methyl Ester 93% + Methyl Lactate 7% was not an effective cleaner for removing production oil and grease. In future testing, a drying step may be needed to gather more accurate mearurements.
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