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Trial Number 10

Trial Purpose:

The purpose of this experiment was to determine the effectiveness of the new set of cleaners in removing Vanishing Oil from company provided cold rolled steel coupons.

Date Run:

09/14/2020

Experiment Procedure:

One cold rolled steel coupon provided by the client was tested for each of the four cleaners. Cleaners were prepared to the following conditions: Metalnox 6386 100% concentration at room temperature, Mirachem 500 20% concentration at 110°F, SC Aircraft & Metal Cleaner 20% concentration at 130°F, and Shopmaster LPH 20% concentration at 130°F. Cold rolled steel coupons were weighed to obtain an initial measurement, then soiled with the Vanishing Oil and a dirty weight was recorded. Once solutions reached the proper temperatures, coupons were submerged into their respective cleaners for 15 minutes. After 15 minutes, coupons were submerged into a deionized water bath at 115°F for 20 seconds. Coupons were then dried using an air gun on the hot setting. Once dry, the coupons were allowed to cool and a clean weight was recorded. Finally contact angle analysis was conducted on each coupon. Three different angles were obtained at different spots along the cleaned coupon and averaged together. Effectiveness of the cleaners was then determined.

Trial Results:

Cleaner Initial wt of cont Final wt of cont %Cont Removed Contact Angle AVG Contact Angle
Metalnox 6386 0.0385 -0.0011 102.86 74.77 79.28
87.99
75.07
Mirachem 500 0.0523 -0.0024 104.59 81.16 83.17
94.88
73.47
SC Aircraft & Metal 0.0294 -0.001 103.4 62.05 65.82
62.82
72.58
Shopmaster LPH 0.0509 0.0035 93.12 92.48 86.70
85.17
82.44

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 terms of soil removed, all cleaners were effective with Mirachem 500 being the most effective removing 104.59% of soil. In terms of contact angle, Shopmaster LPH was the most effective with an average contact angle of 86.70. Mirachem was the second most effective with an average contact angle of 83.17. Note that the average contact angle for solvent cleaned coupons was 75.16. Next steps would be to test on parts provided by the company.

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