plating, anodizing, & finishing Q&As since 1989
Is salt spray test applicable for chemically blackened parts?
May 24, 2010
Is salt spray test applicable for chemically blackened steel parts?
If so, If we do salt spray test for chemically blackened parts how many hours the parts will with stand with out forming rust? Kindly clarify
- Chennai, Tamil Nadu, India
It is not a common test. You must comply with whatever the specification that you are blackening to and your customers purchase order.James Watts
- Navarre, Florida
Aerospace - Yeovil, Somerset, UK
June 2, 2010
Well bluing or blacking on steel is commonly black oxide. Black oxide has absolutely no resistance to sodium chloride and water. With that in mind I assume no one has ever bothered to salt spray test it. There really is no point as one knows what the outcome would be before conducting the test.
gunsmith - Edmonton, Alberta, Canada
June 12, 2011
That was a good point of knowing the black oxide has less resistance to the SST / Chloride.
However,the blackoxide nut .screws are commonly used and there has been many incidence that the screw/nut/bolt get rusty along the way of the shipment.
Hence, one need to know what will be the best test method to test the black oxide towards corrosion.