How to prevent iphone sharing WIFI password with iwatch.

Hiya, does anyone know is there a way to prevent the iphone from sharing its currently connected WIFI password with a connected iwatch? A situation has arose where I have an iphone in work on work WIFI (iwatches not allowed) but I've been told that the iwatch is consistently trying to connected to the work WIFI (since the iphone MUST be sharing the pw with the iwatch).

I don't know the corp WIFI pw myself.so its not me trying to connect the iwatch deliberately to work WIFI. The work IT dept say the iwatches are causing flood alerts because of this. So I'm looking for a disconnect between the iphone and iwatch for WIFI pw ?

R