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  1. kelcgza

    304 stainless pitting issue - looking for source of chlorides

    Citric passivation. Draw, clean, rinse*, passivate, vacuum anneal, restrike for final part shape, clean, rinse, citric passivate, vacuum anneal. Double the chances for pitting! *it wasn't clear to me how or if they dried the parts, I suspect they clean-rinse-dunk directly into the citric in...
  2. kelcgza

    304 stainless pitting issue - looking for source of chlorides

    even worse...no agitation during the alkaline cleaning prior to passivation. (extra large sigh) Pitting only occurs sporadically, so 99% of the time the process has been fine--slapdash, but fine. They are going to switch to non-chlorinated products and DI water. Also by the way, I've been a...
  3. kelcgza

    304 stainless pitting issue - looking for source of chlorides

    I knew I posted too soon... -lubricant is a chlorinated parafin (sigh) -rinse is city water I wanted to be prepared to suggest all the places to look, but I didn't have to look hard. Ultimately, I suspect it is a poor rinsing issue.   
  4. kelcgza

    304 stainless pitting issue - looking for source of chlorides

    Helping out on a problem in a 304L part that sporadically has pitting after deep draw process. I honestly don't know all the details yet of the exact processing steps other than what I can glean from the failed part: -Deep draw in at least 2 steps (there are remnants of a shockline on in the ID...

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