430 Stainless Steel Corrosion at punched holes?
430 Stainless Steel Corrosion at punched holes?
(OP)
I have a roll formed profile in 430 stainless steel, that sporatically develops rust at the punched holes. Some do, some don't, when tested under ASTM B117 Salt Spray Testing for 500hrs. What causes the rust to form around the holes, and not eleswhere on the part? Is there a treatment I can do to the part to eliminate? Passivation, use SS punches, age the part, chemical cleaning? or is it the burr causing corrosion initiation sites?





RE: 430 Stainless Steel Corrosion at punched holes?
How do you de-burr?
A quick deburr with a falp wheel and then a passivation to remove any Fe residue would be my suggestion.
How important is the looks? Maybe a light pickle may be easier.
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RE: 430 Stainless Steel Corrosion at punched holes?
RE: 430 Stainless Steel Corrosion at punched holes?
RE: 430 Stainless Steel Corrosion at punched holes?
Griffy