Crevice Corrosion

[benz]

I've heard folks say that Stainless Steel will only suffer crevice corrosion in an oxygen-starved environment. Is this true? I had an SS wire-gate carabiner from Wichard that corroded most horribly where the gate met the body. It had hung in salt water for a spell, but was by no means oxygen-starved. Could it be that the two different stainless steels corroded each other galvanically?
Thanks
Ben