Unclassified 



Security Classification 



DOCUMENT CONTROL DATA R&D 



(Security classification ol title, body ot abs 



.,11 f, .11,, \.,:.ilti-rl) 



(Corporate author) 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 93041 



REPOR T SECURITY CASS! 



Unclassified 



CORROSION OF MATERIALS IN SURFACE SEA WATER AFTER SIX MONTHS OF EXPOSURE 



/E NOTES (Type ot report and inclusive dates) 



U THORISI (First name, middl 



Fred M. Reinhart 



REPORT DATE 



March 1969 



NO. OF PAGES 



76 



'b. NO. OF REF 



8a. CON TRAC T OR GF 



b. project no. YF 38.535.005.01.004 



TN-1023 



(Any other numbers tha 



distribution statement 



This document has been approved for public release and sale; its distribution 

 is unlimited. 



Naval Facilities Engineering Command 

 Washington, D. C. 20390 



A total of 880 specimens of 215 different alloys were completely immersed in 

 surface sea water for six months to obtain data for comparison with deep ocean 

 corrosion data. 



Corrosion rates, types of corrosion, pit depths, and changes in mechanical pro- 

 perties were determined. 



The highly alloyed nickel alloys, titanium alloys, silicon cast irons, specialty 

 stainless steels, columbium, tantalum and tantalum-tungsten alloy were uncorroded 

 both at the surface and at depth. 



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

 cast irons decreased as the concentration of oxygen in sea water decreased. 



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

 lead-tin solder corroded uniformly. 



All the aluminum alloys were attacked by pitting and crevice corrosion and sea 

 water was more aggressive at depth than at the surface. The effect of the oxygen 

 concentration of sea water on the corrosion of aluminum alloys was inconsistent. 



The stainless steels were attacked by crevice, pitting, edge and tunnel corrosion 

 except types 310, 317 and 329, 20Cb, 20Cb-3 and AM350 on which there was only 

 incipient crevice corrosion. Crevice corrosion was more severe in surface waters 

 than at depth. 



DD , F °o R v M 6 5 1473 (PAGE " 



S/N 0101-807-6801 



Unclassified 



itv Cla 



