> I’ve never found a salt grinder able to sustain the salt corrosion in the long run

There are ceramic grinders now. I'd expect those to not rust, but I don't know how long they stay sharp.

You can make ceramics harder than the hardest steel so staying sharp shouldn’t be a problem.

I've had ceramic salt grinders for years now. Anecdotally you're right, never thought about replacing them.

What timescale are you talking about? I have a William Sonoma salt grinder, as well as one that my friend made for me. They're both about 5 years old. As far as I know there's no significant deterioration on either one. The grinding surfaces are ceramic.

Had usually some issues with (metallic) screws or other minor pieces after 1-2 years. Will take a look at ceramic grinders in the future.

I looked under my William Sonoma grinder today, and the metal screws and bracket near the ceramic grinder are in fine shape.

I use ceramic grinder. No corrosion possible.

I've had a fully plastic one for about 5 years

Delivering microplastics right into the food since 19xx.

we use a cheap ikea grinder, it has ceramic burrs and has undergone countless refills and dishwasher cycles.