Ocean Science Directorate JA 333:027:91

12s. Distribution/Availability Statement.12.V oCde Approved for public release; distribution is unlimited. 13. Abstract (Maximum 200 words). The corrosion behavior of stainless steels, titanium, and copper alloys exposed to flowing Pacific Ocean water was characterized using surface analytical and electrochemical techniques. Biofilm formation on stainless steels and titanium resulted in thin films of bacteria and diatoms that did not cause significant changes of the corrosion potential (Ecw) or surface properties. Rotating cylinder experiments indicated that both E., and corrosion rates for stainless steels and titanium were independent of mass transport. Four surface layers were Identified on copper-containing materials: substratum metal; and inorganic chloride corrosion layer that contained alloying elements; a biof ilm; and crystalline, spherical phosphate-rich deposits. All copper surfaces were colonized by bacteria independent of alloy composition. The complexity of the impedance spectra for copper-containing materials was attributed to formation of surface layers and contributions of charge transfer and mas