Polypyrrole films have been electro-polymerized on SS316L using both galvanostatic and cyclic voltammometric methods. Comparingthepolypyrrolecoatingsformedusingthetwodiffer-ent electrochemical methods, the morphologies are quite differ-ent. For galvanostatic coatings, the particle size increases with increasing applied current. For cyclic voltammometric coatings, the particle size increases with increasing cycle number. For a low current and low cycle number coating, the polishing marks can still be seen on the SS316L substrate. The potentiodynamic tests show that the corrosion potential is increased from −0.27
to 0.171V and the corrosion current density is decreased from 40.01 to 2.38Acm−2 and polarization resistance is increased from 328 to 3459cm2 by coating with polypyrrole. Optical