Its done all the time.. it is how the frames that have chrome lugs is done..
Powder coaters can mask off the portion you wish to keep shiny, too.

chrome as an electro deposition can be removed by flipping the current flow,
but then It may just as well be re-plated entirely.. surface prep in between.

chrome on old italian bikes was not the 3rd metal applied,
unlike the effort taken for Automobile parts.