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I've received a couple of electronic connectors. There is what appears to be corrosion on the outside (elemental analysis shows much higher carbon content than "non-corroded" areas). Customer wants to know if it's cadmium bloom. Internet search stated that cadmium in contact with organic...

Thanks for the input on corrosion of stainless. Now for the add on. The assembly I analyzed is a 316 "stem" with a "blade" pinned in a slot at the bottom of the stem. The 316 was drastically attacked, but the 302 blade was virtually unharmed (surface roughness in the area of the slot). From...

Still haven't gotten specifics, but have another question. The stem has a 302 stainless blade attached to the bottom (pinned in a slot in the stem). The 302 appears to have been attacked under the stem. What would go after 316, but leave 302 alone?

Trying to get more specific details.

Did just that, and you're right it may be the cause. There have only been 2 failures in 2 years like this though. I have no idea what the number in service are. Any idea why one may be more susceptible than another of the "same" composition?

Haven't been told the actual conditions other than commercial water. Here's what's left of the stem.http://files.engineering.com/getfile.aspx?folder=2ee60aaf-30de-4d5e-8252-093551c83cc2&file=cal_stem_1.JPG

I have a solid "stem" made from 316 stainless. The part has almost been eaten away from the inside (again, it's not hollow). It's used in commercial water application. What could attack the steel that badly? Elemental analysis does show a small % of sulphur (0.3 - 3.0 depending on the...