Unclassified 



Sccuntv Classify 



DOCUMENT CONTROL DATA - R 8. D 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 93043 



Unclassified 



CORROSION OF MATERIALS IN SURFACE SEAWATER AFTER 12 AND 18 MONTHS 

 OF EXPOSURE 



Final - June 1966-June 1971 



Fred M. Reinhart and James F. Jenkins 



January 1972 



103 



10 



YF 38.535.005.01.004 



Technical Note N-1213 



I (Any other numbers tha 



Approved for public release; distribution unlimited 



Naval Facilities Engineering 

 Command 



A total of 1150 specimens of 189 different alloys were completely 

 immersed in surface seawater for 12 and 18 months to obtain data for 

 comparison with deep ocean corrosion data. 



Corrosion rates, types of corrosion and pit depths were determined 



Some highly alloyed nickel alloys, titanium alloys, silicon cast 

 irons, specialty stainless steels, columbium, tantalum and a tantalum- 

 tungsten alloy were uncorroded in seawater both at the surface and at 

 depth. 



The corrosion rates of the copper base alloys, nickel base alloys, 

 steels, cast irons, lead, tin, lead-tin solder, molybdenum and tung- 

 sten decreased with the concentration of oxygen in seawater, i.e., 

 the corrosion rates were lower at depth than at the surface. The 

 corrosion rates of Ni-200 , Ni-Cu 402, 410, K-500 and 45-55, Ni-Cr-Fe 

 X750, Ni-Mo2 , all steels, grey cast iron and alloy cast irons de- 

 creased linearly with the concentration of oxygen in seawater. 



The copper base alloys, steels, cast irons, molybdenum, tungsten, 

 lead and lead-tin solder corroded uniformly both at the surface and at 



de P th - Continued 



DD 



,1473 



(PAGE 1 ) 



Unclassified 



S/N 0101-807-68 



