To evaluate the effectiveness of aqueous cleaners at the removal of gundrill oil/coolant from stainless steel alloy using heated ultrasonics at vendor recommended temperatures.
Date Run:
06/11/2019
Experiment Procedure:
Initial weights were obtained for 15 stainless steel coupons, three for each cleaner, before soiling with gundrill oil/coolant mixture on half of the coupon on one side. Coupons were immediately weighed to obtain the dirty weight. Three coupons were immersed in each cleaner for 25 minutes in their recommended temperature by the vendor while making observations every five minutes. Coupons were removed from cleaners, immersed in deionized (DI) water and allowed to air dry for one hour at room temperature (68 F) before taking final weights.
Chemistries Evaluated:
Buckeye Immersion Cleaner
Liquinox Critical Cleaning Detergent
Alconox Powdered Precision Cleaner
Company Name
Product Name
Concentration
Temperature
Buckeye International
Buckeye Immersion Cleaner
2:10
125 F
Alconox Inc.
Liquinox Critical Cleaning Detergent
1:100
80 F
Alconox Inc.
Liquinox Critical Cleaning Detergent
1:100
100 F
Alconox Inc.
Alconox Powdered Precision Cleaner
1:100
80 F
Alconox Inc.
Alconox Powdered Precision Cleaner
1:100
100 F
Trial Results:
After air drying at room temperature (68F), it appeared there was some cleaner residue on the coupons, so coupons were patted dry once. Liquinox for both 80F and 100F temperatures were effective at removing oil/coolant and were at 91.81% and 94.85% respectively. Alconox was effective at the higher temperature of 100F at 96.40% effectiveness but not at 80F which was 85.01% effectiveness. Buckeye immersion cleaner was 94.56% effective at 125F with a higher concentration of 2:10 (1:5) when compared to the last test.
Chemical Name
Initial Weight of Cont
Final Weight of Cont
% Removed
Average
Buckeye Immersion Cleaner
0.0053
0.0001
98.11
94.56
0.0052
0.0001
98.07
0.0104
0.0013
87.50
Liquinox (80F)
0.0070
0.0005
92.85
91.81
0.0081
0.0005
93.82
0.0080
0.0009
88.75
Alconox (80F)
0.0050
0.0008
84.00
85.01
0.0072
0.0013
81.94
0.0055
0.0006
89.09
Liquinox (100F)
0.0069
0.0002
97.10
94.85
0.0108
0.0007
93.51
0.0099
0.0006
93.94
Alconox (100F)
0.0088
0.0002
97.72
96.40
0.0073
0.0001
98.63
0.0070
0.0005
92.86
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Coupons appeared clean once they were patted dry, which removed some apparent chemical residue. Coupons may benefit from a spray rinse instead of dipping coupon into DI water. Increasing the heat with the Alconox and Liquinox cleaners appeared to increase the percent removal of contaminant. Of note, when using the ultrasonic cleaner, it appeared that one coupon in each set had more oil droplets on it during the cleaning than the other two; not clear whether this is related to how much soil was added to the coupon or the placement in the ultrasonic cleaner.
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