Galvanic corrosion between Inconel 750 with 316 stainless steel

[ram1817]

I had Non Conformity report from vendor on Code 62 Flange bolt pattern true position call out 0.010 and they machine with 0.120. One tapped hole is misplaced and they want to helicoil repair.
I will prefer to use Inconel 750 helicoil to repair this as base material is 316ss
This is going to use in sea water 5500 ft under water.
Do they have chance to galvanic corrosion ?

 

[CoryPad]

If the 316 stainless steel is passivated, then both materials should have an electrode potential of ~ -0.1 V SCE. I think this could work, and a physical test with actual parts is straightforward.

 

[EdStainless]

cold seawater, limited oxygen, This looks like a low risk combination to me.

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