Re: Embedded Chain plate maint/replacement
Electropolishing is a process where the metal is submerged in an acid and an electric current is run thru the system. This causes the imperfections to be lifted from surface. Basically it is plating in reverse, but because of the way it works it takes high spots down faster than the bulk of the material. By removing the high spots and edges it also reduces the number of crevices that salt crystals can hide in, which reduces the speed with which crevice corrosion can occur.
What you are talking about is called pasivation. Which helps bring the chromium to the surface. Since this is what provided the corrosion protection in stainless, the more surface chromium there is again the slower corrosion occurs.
These processes are complimentary but very different.