https://www.pfonline.com/articles/iron-plating(2)
I also had never heard of it but thought it was an interesting question
Google search - Electroplating Iron
shows that it is indeed a process very useful to add several '000 inch to build up a surface.
Surprise that there is more than one bath solution, and expected the cautions to avoid rust plating the target surface. Iron does have an affinity for Oxygen.