Corrosion on 430 stainless steel bolt head after salt-spray test
Corrosion on 430 stainless steel bolt head after salt-spray test
(OP)
I am a mechanical engineer working in the CATV (cable TV) industry, and after a recent salt-spray test, the 430 stainless steel bolts (passivated) which fasten our clam-shell enclosure design together for the outdoor environment have shown signs of rust (particularly in the bolt head region). The entire unit was suspended in a salt-spray chamber and subjected to a salt-spray condition of 95 degrees F for 14 days within a salt-fog solution containing 5% sodium chloride (salt).
Can anyone shed some light why the passivation process in the 430 stainless may have been interrupted and the salt-spray solution was allowed to attack the underlying metal?
Can anyone shed some light why the passivation process in the 430 stainless may have been interrupted and the salt-spray solution was allowed to attack the underlying metal?





RE: Corrosion on 430 stainless steel bolt head after salt-spray test
As a guess: the paasivation [natural oxide] is being erroded and cannot reform under the constant salt spray.
Regards, Wil Taylor
RE: Corrosion on 430 stainless steel bolt head after salt-spray test
RE: Corrosion on 430 stainless steel bolt head after salt-spray test
Cheers
Greg Locock