Abstract: A system and method for inhibiting corrosion of oil field pipe exposed to corrosive material including hydrogen sulfide, carbon dioxide, and sodium chloride with a corrosion inhibiting film which is a precipitate film formed by the reaction of a polysulfide with ferrous iron. The ferrous iron may be a constituent of the fluid passing through the pipe or separately injected. The polysulfide is the reaction product of hydrogen sulfide as a constituent existing in the passing fluid and an oxidizing agent such as ammonium nitrate separately introduced into the passing fluid. The method includes the steps of continuously passing a fluid carrying corrodents through the pipe, continuously bringing a polysulfide into being within the fluid, and continuously bringing elemental ferrous iron into reaction with the polysulfide within the passing fluids to form a precipitated film which is an effectively amorphous film having a predominant amount of iron disulfide.