Trial Purpose:
To evaluate six cleaning products for Rustlick 50/50 removal from copper coupons.
Date Run:
07/29/2019Experiment Procedure:
Three pre-weighed copper coupons were used for each cleaner. The coupons were soiled halfway on one side using a hand-held swab before dirty weights were recorded. Dilutions and temperature for each cleaner was based on vendor recommendations. Coupons were immersed three at a time for 15 minutes, and visual observations were recorded every five minutes. Cleaned coupons were rinsed in heated (95o F) tap water for five minutes, air dried for five minutes with a heat gun, and then final weights were recorded.
Trial Results:
| Cleaner | Initial wt. of cont. | Final wt. cont. | % Cont. Removed | Average |
| 1 | 0.1138 | 0.0025 | 97.80 | 99.03 |
| 0.0825 | 0.0002 | 99.76 | ||
| 0.0890 | 0.0004 | 99.55 | ||
| 2 | 0.0550 | 0.0000 | 100.00 | 99.26 |
| 0.0825 | 0.0006 | 99.27 | ||
| 0.0946 | 0.0014 | 98.52 | ||
| 3 | 0.0506 | 0.0014 | 97.23 | 97.53 |
| 0.0560 | 0.0010 | 98.21 | ||
| 0.0662 | 0.0019 | 97.13 | ||
| 4 | 0.0867 | 0.0030 | 96.54 | 98.24 |
| 0.1318 | 0.0011 | 99.16 | ||
| 0.0906 | 0.0009 | 99.01 | ||
| 5 | 0.0924 | 0.0039 | 95.78 | 94.65 |
| 0.0827 | 0.0050 | 93.95 | ||
| 0.0779 | 0.0045 | 94.22 | ||
| 6 | 0.0773 | 0.0025 | 96.76 | 97.83 |
| 0.0867 | 0.0007 | 99.19 | ||
| 0.0771 | 0.0019 | 97.54 |
Visual Observations
| Cleaner | 5 Mins | 10 Mins | 15 Mins | Rinse |
| 1 | - immediate removal of all thin layer of soil -tiny clear bubbles forming - most soil removed before 5 min mark |
- water turned slightly blue - some tiny clear bubbles on coupon |
- water is slightly blue + cloudy - coupon looks clean - slight chemical smell
|
- coupon looks to be clean - dilution is clear |
| 2 | - too cloudy to see | - water clearing up - most soil looks to be removed - very small amount of tiny clear bubbles |
- coupon looks clean - water is clear
|
- coupon looks to be clean - dilution is clear |
| 3 | - soil immediately turned pale blue - removing thin layers of soil before 5 mins - very thick layer of soils not removed |
- thicker layers of soil slowly being removed - clear tiny bubbles visible on coupon |
- water turning slightly cloudy + blue - lots of tiny clear bubbles |
- coupon looks to be clean - dilution is clear |
| 4 | - soil immediately coming off - blue swirls (due to agitation) visible - swirls moving to top of water |
- water slightly turning blue - tiny clear bubbles visible on coupon - thicker layer of soil still remain on coupon |
- very little soil still on coupon - flakes of soil floating at top - water turning cloudy + blue |
- coupon looks to be clean - dilution is clear |
| 5 | - soil immediately turned pale blue - soil forming swirls (due to agitation) |
- thick layer of soil still remain - water getting cloudy - some soil still on coupon |
- coupons look fairly clean before 15 min mark | - coupon looks to be clean - dilution is clear |
| 6 | - immediate blue swirls (soil coming off) - water getting slightly cloudy |
- some soil rising to top - very thin blue rim at top of water |
- water slightly cloudy - coupon looks fairly clean - tiny clear bubbles on coupon |
- coupon looks to be clean - dilution is clear |
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.Conclusion:
All six cleaners were effective at removing Rustlick 50/50 from copper coupons. Next step would be to pick the top four best performing cleaners to test on dirty parts provided by Barry Industries.
