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Trial Number 11

Trial Purpose:

The purpose of the experiment was to refine the cleaning parameters for heated ultrasonics.

Date Run:

11/02/2020

Experiment Procedure:

Two solutions were prepared to the following concentrations: Metalnox 6386 100% and SC Aircraft & Metal Cleaner 30%. Solutions were added to a heated ultrasonics bath at 120°F. One aluminum mirror polish part pre-soiled with buffing compound was obtained for each cleaner. Photos were taken before cleaning as well as a white glove test to verify presence of soil. Once solutions reached the proper temperature, parts were submerged into their respective cleaners and heated ultrasonics was conducted for 15 minutes. At five-minute intervals, parts were removed from solution to take observations on the cleaning process. After 15 minutes, the part cleaned with SC Aircraft & Metal Cleaner was submerged into a deionized water bath for 30 seconds. Both parts were then dried with a heat gun and set aside for 24 hours. After 24 hours, observations of cleaning were recorded, post treatment photos were taken, and another white glove test was conducted to verify removal of soil.

Trial Results:

Cleaner Observations
Metalnox 6386

5 min: Buffing compound remains

10 min: Most buffing compound removed except for one small dark patch on egde

15 min: Small patch was almost entirely removed, was much lighter after additional 5 mins of cleaning

No markings or streaks observed on substrate

SC Aircraft & Metal Cleaner

5 min: Buffing compound remains

10 min: Buffing compound remains on edges

15 min: Edges have been darkened, white glove test showed very little soil remains on edges but it still present

No markings or streaks observed on substrate

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

Increasing concentration of SC Aircraft & Metal Cleaner did improve soil removal. Both cleaners were very effective at removing buffing compound from aluminum mirror polished parts via heated ultrasonics. Though 10 minutes removes almost all soil, 15 minutes ensures thorough cleaning. A deionized water bath is necessary when cleaning with SC Aircraft. Next steps would be to discuss results between the company and lab management.

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