It depends on what the desired outcome is.
Chemical passivation is required after electropolishing, since electropolishing passivates the surface only to a condition typically attained by phosphoric acid. Passivation with citric acid based chelant systems or nitric acid will effectively improve the Cr/Fe ratio and double the corrosion resistance of an electropolished surface alone (Chart #1).
Passivation improves the chemistry of the surface (increases the Cr/Fe ratio) while electropolishing removes surface damage, improves the surface profile and cleanability, or smoothes the surface. While electropolishing passivates the surface, it does not meet the Cr/Fe ratio levels attained by comparative passivation processes.
In summary, if the goal is to attain a set Cr/Fe ratio -then passivation is the process to use but if a cleanable corrosion resistant surface is desired, then electropolishing followed by chemical passivation is the best choice.