Relationship between d.c. volts and electrolysis in steel

[stevecarson]

We use a 10v a.c. signal through to a small steel sensor (SMO 254) in wastewater - and the control device looks for a conductive path to ground to determine that the level of liquid is over the sensor.

We don't use d.c. because of the electrolysis effect - but the circuit we use could have a d.c. component - which might mean that over a period of time the sensor gets eaten away.

Is there a graph or formula for increases in d.c. voltage vs electrolysis effect (e.g. mm/yr)?

Thanks
Steve
Brisbane

 

[Astronuc]

One probably wants to find the polarization curve, i.e. applied potential vs log I (current), for SMO 254.