The objective of this investigati.on was to contribute to
the determination of a suitable metallic coating for steel
reinforcement in concrete exposed to a marine environment
and possibly to stray current. Concrete specimens embedded
with steel, aluminum, cadmium, copper, molybdenum, nickel,
and galvanized steel were exposed to sea water. Direct
current was impressed on these to accelerate corrosion of
the reinforcement so that cracking of the concrete could be
observed within the time limit of the investigation. Aluminum,
cadmium, copper, and nickel were found to have no beneficial
effect on concrete cracking as compared to steel. In
addition, no correlation between oxide-metal volume ratio
and concrete time-to-cracking could be observed. It was
found that corrosion of molybdenum has little or no tendency
to crack concrete and its corrosion potential and active
behavior approximates that of steel, indicating it may be
an excellent coating.