To see if previously identified solvent/cleaner successful with unheated ultrasonics will also be successful in removing varnish from steel coupons with unheated immersion.
Date Run:
08/14/2023
Experiment Procedure:
Three steel coupons were used for each cleaner tested, for a total of six coupons. Initial weights of coupons were taken. The varnish was heated to 350 F on a hot plate. Each coupon was placed on the hot plate for a total of 30 seconds. The varnish was then applied to the heated coupons with a metal scraper in order to achieve a thin layer of varnish on the bottom third of the coupons. Once the varnish had solidified, dirty weights of each coupon were taken. Coupons were then subjected to 15 minutes of unheated immersion with a stir bar set at 200 rpm. The chosen solvents/cleaners tested were A. D Limonene 85% + Dimethyl Glutarate 15%, and B. Metalnox 6386 100%. After air drying, clean weights were taken.
Trial Results:
Cleaner
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
D Limonene 85% + Dimethyl Glutarate 15%
0.0544
0.0012
97.79
93.50
0.0413
0.0020
95.16
0.0650
0.0081
87.54
Metalnox 6386 100%
0.0409
0.0395
3.42
7.44
0.0201
0.0163
18.91
0.0287
0.0287
0.00
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
A. D Limonene 85% + Dimethyl Glutarate 15% is an effective solvent in removing varnish from steel coupons using unheated immersions. B. Metalnox 6386 100% is not an effective aqueous cleaner in removing varnish from steel coupons using unheated immersion.
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