NIST has patented a process of depositing metal filling called, “electodeposition” to fill up structures like pinholes in metal tubes in steam boilers without leaving air pockets or “seams” between the depositing metal and the structure. Electodeposition automatically occurs when an additive to the metal fillings falls below a predetermined concentration level.
Thomas P. Moffat
Additional development will enable extension to geometries where the pinhole or crack to be filled is remotely located as in tubes or pipers. Such processes would enable remote repair of steam boilers, including in nuclear reactors.