Click Personal Profile after login to opt out. I have learned more through this forum than I did on a two day course. There will be no measurable galvanic corrosion between these two alloys. The problem is that the 304L will pit more readily - depends on temperature and available oxygen for reduction to support metal oxidation. Once the pitting starts in the 304L it will be accelerated by the non-pitting 316 adding to the area available for oxygen reduction.
Cathodic protection is one way to prevent pitting.
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