Zinc release on brass items in oil environment
Zinc release on brass items in oil environment
(OP)
Hi everyone...
I have the following situation in my project:
We have a hidraulic oil system that was been classified after a flushing operation according to the cleaness parameters, however during a few weeks of trials the oil sample revealed zinc contamination.
The flush is performed with the oil itself running in the system for 7 hours at 70 celsius degree.
The oil is a Fhari, fire resistant hydraulic fluid.
We worked on many hypotheses, and now we are working on the possibility of brass items inside the system or used during the test phase.
Does anyone knows a standard test to check the zinc release of brass in oil? Before checking the system, I would like to confirm this possibility.
If there is no standard to this test, can anyone help me on how can I catalyze this reaction?
Otherwise I'll need to run the line to find brass items, which my be difficult because we use CuAl connectors.
Thanks!!!
I have the following situation in my project:
We have a hidraulic oil system that was been classified after a flushing operation according to the cleaness parameters, however during a few weeks of trials the oil sample revealed zinc contamination.
The flush is performed with the oil itself running in the system for 7 hours at 70 celsius degree.
The oil is a Fhari, fire resistant hydraulic fluid.
We worked on many hypotheses, and now we are working on the possibility of brass items inside the system or used during the test phase.
Does anyone knows a standard test to check the zinc release of brass in oil? Before checking the system, I would like to confirm this possibility.
If there is no standard to this test, can anyone help me on how can I catalyze this reaction?
Otherwise I'll need to run the line to find brass items, which my be difficult because we use CuAl connectors.
Thanks!!!
RE: Zinc release on brass items in oil environment
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P.E. Metallurgy, consulting work welcomed
RE: Zinc release on brass items in oil environment
My guess, if it was leaching just zinc the brass would shift to majority copper on the surface and become obviously copper colored.
RE: Zinc release on brass items in oil environment
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RE: Zinc release on brass items in oil environment
RE: Zinc release on brass items in oil environment
More likely it is Zn either from rust preventative coatings or oils and grease used in assembly. I can't see a mechanism for solective de-alloying of brass in oil.
About the rust coating it is a CuAl based system, so no zinc plated items on it for exemple. I will check the possibility of grease or oils, but the sysyem was already flushed and got the good classification of the oil.
3DDave (Aerospace)4 Oct 20 20:42
I would start with a call to the fluid maker as they will have far more experience with their own product. Then I would place a handful of brass into a heated glass bottle of stirred fluid with samples sent for analysis of the fluid before introducing the zinc and then every few days for a week.
My guess, if it was leaching just zinc the brass would shift to majority copper on the surface and become obviously copper colored.
We hope to not open the circuit, but when we have too we are going to check for the connectors if there is any color chance....
TugboatEng (Marine/Ocean)4 Oct 20 23:22
Hydraulic oil normally contains 1000+ ppm zinc. You mention fhari, is this an oil or water based lubricant? Brass and zinc plated fittings have been a concern in systems in the past but only if fluid had a high sulfur content.
More details about the oil: houghto safe 200x oil
Thanks you all!
RE: Zinc release on brass items in oil environment
RE: Zinc release on brass items in oil environment
RE: Zinc release on brass items in oil environment
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