The purpose of this experiment was to determine the effectiveness of cleaners on all remaining parts in the lab provided by the company.
Date Run:
11/30/2020
Experiment Procedure:
Cleaners were prepared to the following concentrations: Metalnox 6386 100% and SC Aircraft & Metal Cleaner 30%. One substrate of the following parts was obtained for each of the cleaners: Mirror Polish Lacquer, Satin (Grained & Wax), Paint Prep, Brass Mirror Polish. All parts were pre-soiled by the company. Cleaning solutions were heated to 120°F and added to an ultrasonic bath also at 120°F. Once solutions reached the proper temperature, parts were individually submerged into their respective cleaners for 15 minutes. After cleaning, all parts tested with SC Aircraft were submerged into a deionized water bath at 120°F for 30 seconds. All parts were then dried with a heat gun. Effectiveness of cleaning was determined.
Trial Results:
Cleaner
Part
Observations
Metalnox 6386
Mirror Polish Lacquer
Pre: Buffing compound present along edges and back
Post Clean: Buffing compound observed around edges
Post Dry: Appears clean, some marking which could be residual coating at top of part. Edges still have buffing compound (could also be not "blasted")
Satin (Grained & Wax)
Pre: Crystalline deposit at center
Post Clean: Crystalline substance removed; no visual damage
Post Dry: Appears clean with all crystalline removed
Paint Prep
Pre: Very similar to blasted edge parts tested previously except silver
Post Clean: Appears visually clean, dried very quickly (within seconds)
Post Dry: Appears clean with no visual damage
Mirror Polish Brass
Pre: Observable coating film on front of part
Post Clean: Appears clean some marking or residual coating present
Post Dry: Appears clean with some markings. Markings look as though they were caused from production and not damage from cleaning.
SC Aircraft & Metal
Mirror Polish Lacquer
Pre: Buffing compound along edges and back
Post Clean: Some residual coating remained on front surface of substrates. White film developed after rinse step which disappeared with heating.
Post Dry: Residual coating remains on parts, edges still have buffing compound (could be due to not being "blasted")
Satin (Grained & Wax)
Pre: Crystalline deposit at center of substrate
Post Clean: All crystalline substance removed, minor scratch at top of substrate most likely from tweezers
Post Dry: Appears clean with a slight scratch most likely from tweezers when moving substrate
Paint Prep
Pre: Similar to blasted edge previously tested only silver
Post Clean: Appears visually clean, dried very quickly
Post Dry: Appears clean with no visual damge
Mirror Polish Brass
Pre: Coating visibly present on the front surface of the substrate
Post Clean: Tweezers cause slight damage to top of substrate, no other markings.
Post Dry: Some residual patches of coating, scratching at top of substrate due to tweezers.
Overall, Metalnox and SC Aircraft were most effective for Satin and Paint Prep parts. Some residual coatings and/or markings were observed on Lacquer and Brass Mirror Polished Parts. Parts will be sent to company to review and verify effectiveness of cleaner performance. Note that Lacquer parts had been at laboratory for an extended amount of time. The aging of the soil could have impacted overall cleaner performance.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Upon completion of testing, it was determined that both Metalnox and SC Aircraft are effective for Satin and Paint Prep parts. Verification by the company will be required to determine if performance is acceptable for Brass and Lacquer Mirror Polished Parts. Should company approve of overall performance and require no further parts testing, next steps would be to work with company towards implementation.
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