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Trial Number 2

Trial Purpose:

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:

  1. Buckeye Immersion Cleaner
  2. Liquinox Critical Cleaning Detergent
  3. 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) 0.007 0.0005 92.85 91.81
0.0081 0.0005 93.82
0.008 0.0009 88.75
Alconox (80F) 0.005 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
0.007 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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