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When writing the above I had not read the post about chloride attack. In regards to stainless I can offer no experience, as the presence of chloride in-vitro usually means the patient is on the mortuary slab, and not the operating table.
But it is a problem with machining certain titaniums, as the small quantities of chloride present in metal cutting fluids can attack the titanium. Nothing visible to the eye, but a worry in failure adverse medical and aerospace industries. Chloride-free fluids are specified. Chlorides can be absorbed into iron, and then leech out over time causing serious corrosion. The hull of the Great Britain is a prime example.