Q: I’m dealing with a stagnant seawater situation. I’ve tried Monel 400 bolts because of its salt water resistance but am experiencing mild pitting corrosion. Any material that would fair better?
A: Monel 400‘s only Achilles heel in terms of salt water situations usually occurs in stagnant waters where is can experience crevice and pitting corrosion. For still seawater, I would suggest Titanium grade 2 fasteners, which is known for its high resistance to sea water and all chloride environments, even at high depths and temperatures. If you need higher strength, you can always go with grade 5 bolts which are twice as strong as grade 2.