The reinforcing steel in concrete can best be protected from the corrosive effects of deicing salts by coating the steel with zinc, nickel, or an asphalt-epoxy. This was the conclusion reached by the Battelle Memorial Institute of Columbus, Ohio, after a two year laboratory research study for the National Cooperative Highway Research Program. Zinc and nickel are the two most effective metallic coatings, according to the report. When breaks in the zinc- coated rods occurred, "sacrificial" protection in both acid and alkaline solutions was provided by the zinc. Nickel possessed good corrosion resistance in alkaline solutions even when there were breaks in the coating, although the protection was not termed "sacrificial." Accelerated corrosion resulted form breaks which occurred while the nickel-coated rods were in acid chloride solution, however. There is very little likelihood of a rupture in nickel coating in the coating is form 3 to 5 mils thick, according to the report. Experiments with non-metallic coating showed, also, that good protection to reinforcing steel was provided by an asphalt-epoxy coating. This type of coating offers the plus factor of very high electrical resistance. The production of insoluble silicate coatings proved unsuccessful.