To evaluate two most effective products found for this client for tarnishing effect with solution at room temperature.
Date Run:
02/06/2007
Experiment Procedure:
The two most effective products from previous trials and the onsite testing were chosen along with DI water. The products were diluted with DI water to 5% and were left at room temperature ~ 68 F. Two beakers were also filled with DI water. One was left at room temperature, and one was heated to 130F. Three brass cylinders were put in each beaker and the parts were left to soak in them for approximately 2 hrs. The parts were not rinsed or dried after they were taken out. They were put on a white paper towel to be visually observed for tarnish.
Trial Results:
The two products at room temperature tarnished the parts. The warm and cold DI water did not. Therefore, the chemistry is the problem with the tarnish issue.
Cleaner
Observation
Polyspray 790 XS
Extreme tarnish, brown color
Daraclean 283
Moderate tarnish, orange to tan color
DI Water 130 F
No tarnish, no color change
DI Water
No tarnish, no color change
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Both products at 5% and at room temperature tarnished the brass parts. Therefore, the chemistry seems to be the issue with the tarnish issue. Their pH's will be looked up and other cleaners will be selected to clean these parts and also be looked at for tarnishing.
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