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Loss of coblat from stellite components

Loss of coblat from stellite components

Loss of coblat from stellite components

I'm trying to track down the source of elemental cobalt in power plant feedwater.  The water is super clean (0.2 usiemens), low O2, 250-350F,and sub ppm So4, Cl, Cu and Na ~ 1 ppm Fe. Water is sent to a nuclear reactor where the Co containing sludge is activated by neutrons causing secondary ( and problematic) radiation.
Many of the valves and bearing surfaces contain stellite/cobalt and there is no measureable loss of material (from cavitation or wear).  Is it possible that there might be uniform loss of material from some local galvanic cell or electroplating effect, causing caobalt to plate out on iron (piping, pump internals, etc) surfaces.
Does anyone have experience with loss of materials (Co) in this environment from anodic attack ?  

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