Titanium heat exchanger silt damage

Brief backward reference to titanium heat exchanger silt case discussed in previous session. ## Figures referenced

So we have localized corrosion — crevice, pitting, intergranular, local electrical differences caused by breaks in the coating or dissimilar metals. One of the dissimilar metals we already talked about — they call it galvanic attack on this little thing. This is the noble metal next to the base metal. This is just the copper on the stainless steel or the gold on the stainless steel for the hydrocephalic shunt. We're walking through these things. We talked about the pitting, crevice corrosion — I mentioned yesterday when I talked about the silt that got in the titanium heat exchanger.