Will lockers seize if left on anchor?

Hi all, I have a couple of Metolius locking steel carabiners. I'm wondering whether I can leave them up on an anchor---or if doing so will make them seize up. Since the anchor is only used for TR-ing (and I don't mind people TR-ing straight off the hardware in this case), it would be cool to have lockers for people to use, but obviously not if they're just going to just become a closed system within the year.

The crag is not by the sea.

In my experience they are finished after the first rainy period, grit washes into the open barrel and that's it.

If the rock overhangs above the anchor you might get away with it. otherwise... what Mr. Titt said.

What would be a good alternative connector to use if:

• you know it's going to get wet 
• it has to be outside
• you will need to periodically disconnect it

I was considering a stainless shackle as a potential alternative, but could the threads for the pin have the same problems? 

I don't have much experience with stainless quicklinks outside—would they also have problems seizing?

Would an auto locker like the Petzl Oxan Triact seize as readily?

Carbon steel quick links are bad for needing to be cut off. I have not had that experience with stainless ones. Stainless shackles maybe even less likely to be a problem . The standard ones need a method to retain a loose pin like stainless safety wire. For the ones like team tough/ bolt products sell you would need a supply of stainless cotter pins.