I'm wondering if anyne could help understanding a reaction
I've observed. We are pumping a liquid Gallium alloy (67% Ga,
20.5 In, 12.5 Sn by weight) through a cast iron diplacement pump.
Something is reacting and what we get out is a frothy cream/foam that
is darkened; blackened even more than the typical oxide layer/membrane
that forms at the top of the liquid normally in air.
One thought is that the sulfur content of the iron is reacting with the indium in the heated parts of the pump. If so, a stainless steel pump should do the trick, or so I think. Any other ideas?
Your suggestions or references would be appreciated, thanks.