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- a couple of electrodes composed by silver and the Ti BT23 alloy was located in a glass cells filled with sea water.
- the couple of electrodes was connected to a voltmeter on a 10 Kohms resistence.
-the reading of the meters was recorded for a 30 days period.
-the same procedure was applied in parallel to another couple of electrodes composed by silver and the other Ti 6 Al 4 alloy.
The plot shows the voltage reading as a function of time; the red triangles refer to the Ag/BT-23 couple while the blu diamonds refer to the Ag/Ti grade-5 couple. The expected voltage between the two Ti alloys can be estimated from the difference of the red to the blue points: it is compatible to zero for most of the time indicating no evidence of galvanic currents. The sharp spike in the Ti-grade 5 measurement might be due to a water refilling of the corresponding cell.