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Trial Number 2

Trial Purpose:

To evaluate the effectiveness of solvent and aqueous based cleaners at the removal of J2 on titanium substrates.

Date Run:

08/14/2019

Experiment Procedure:

Six sets of three pre-weighed clean titanium coupons were contaminated on the bottom 1/3 of the coupon with J2 soil using a cotton swab. Cleaners were heated to vendor recommended temperatures, and coupons were immersed and sonicated, three at a time, into a beaker for 15 minutes. Visual observations were recorded every five minutes, and final weights were recorded after cleaning.

Trial Results:

Gravimetric Results:

Cleaner Conc. (%) Temperature (°F) Initial wt of cont. Final wt of cont. %Cont Removed % Average
Dowanol PnBGE 100 100 0.8042 0.0008 99.90 99.87
1.1057 0.0010 99.91
0.8855 0.0019 99.79
Metalnox 6386 100 110 0.8975 0.0094 98.95 99.53
0.7417 0.0017 99.77
0.7898 0.0011 99.86
Dimethyl glutarate 100 130 0.8755 0.0105 98.80 97.80
0.7959 0.0183 97.70
0.6964 0.0215 96.91
Liquinox 1 150* 0.8485 0.1618 80.93 87.27
0.6975 0.0836 88.01
0.7780 0.0554 92.88
Ozzy Juice 3 100 106 0.9661 0.1439 85.11 85.59
1.0291 0.2203 78.59
1.1189 0.0774 93.08

*Temperature for Liquinox was lowered due to the temperature range limitations of the ultrasonic tank in the lab.

Visual Observations

Dowanol PnBGE

  • Majority of soil was removed after 15 minutes of cleaning.
  • Substrates stacked on top of each other after 10 minutes of cleaning. Part configuration may have affected results.
  • The soil was highly viscous.
  • The cleaner is clear.

Metalnox 6386

  • Some residue of the soil remained on the coupons after 15 minutes of cleaning.
  • Substrates stacked on top of each other after 10 minutes of cleaning. Part configuration may have affected results.
  • The soil was highly viscous.
  • The cleaner is clear.

Dimethyl glutarate

  • Majority of soil was removed after 15 minutes of cleaning.
  • The soil was highly viscous.
  • The cleaner is clear. 

Liquinox

  • Majority of soil was removed after 15 minutes of cleaning.
  • Substrates stacked on top of each other after 10 minutes of cleaning. Part configuration may have affected results.
  • The soil was highly viscous.
  • The cleaner became cloudy after 15 minutes of cleaning, and soil residue submerged to the bottom of beaker.

Ozzy Juice 3

  • Majority of soil was removed after 15 minutes of cleaning.
  • The soil was highly viscous.
  • The cleaner was initially a slight brownish color, and became cloudy after 10 minutes of cleaning. 

Other Observations: 

The amount used during this testing was higher than the heated immersion test. This may have contributed to the decrease in performance for some of the cleaners. The table below shows the increase of J2 between the two tests. Considering many of the cleaners worked between 85%-99% with heated ultrasonics, it would make sense to still move forward with these alternatives to test on the parts provided by the client.

  Initial wt. (g) of contaminant
Product Heated Immersion Heated Ultrasonics
Downanol PnBGE 0.2660 0.8042
0.2716 1.1057
0.2971 0.8855
Metalnox 6386 0.4257 0.8975
0.3608 0.7417
0.3755 0.7898
Dimethyl glutarate 0.4796 0.8755
0.2905 0.7959
0.2362 0.6964
Liquinox 1% 0.5055 0.8485
0.4376 0.6975
0.3164 0.778
Ozzy Juice 3 0.3677 0.9661
0.3562 1.0291
0.3015 1.1189

Success Rating:

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

Conclusion:

Dowanol PnBGE, Metalnox 6386, and Dimethyl glutarate were the most effective at removing J2 soil from bead blasted titanium substrates using heated ultrasonics.

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