Unclassified 



Seciintv Classification 



DOCUMENT CONTROL DATA R&D 



ion ol lillo, body oi iibslruci ,i,ij ,nd'rxi:u] .InnoUilion .--lu.s) he sniercd v.hfn Ihi 



G1NATING ACTIVITY (Corporate author) 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 



2a. rt EPOR T SECU Rl TY C^ASSIFI 



Unclassified 



CORROSION OF MATERIALS IN HYDROSPACE, PART IV - COPPER AND COPPER ALLOYS 



i (Type o! repor 



HORIS) (First name, middle i 



Fred M. Reinhart 



April 1968 



118 



17 



Y-F015-21-05-001 



TN-961 



I (Any other numbers tha 



ttl 





I 2. SPOSlSO F 



Naval Facilities Engineering Command 

 Washington, D. C. 



A total of 1050 specimens of 46 different copper alloys were exposed at two 

 depths, 2,500 and 6,000 feet, in the Pacific Ocean for periods of time varying 

 from 123 to 1064 days in order to determine the effects of deep ocean environ- 

 ments on their corrosion resistance. 



Corrosion rates, types of corrosion, pit depths, stress corrosion cracking 

 resistance, changes in mechanical properties and analyses of corrosion products 

 of the alloys are presented. 



Copper, beryllium-copper, arsenical admiralty brass, aluminum brass, nickel 

 brass, G bronze, modified G bronze, M bronze, leaded tin bronze, phosphorous 

 bronze A, phosphorous bronze D, nickel-aluminum bronzes, Ni-Vee bronze A, Ni-Vee 

 bronze B, Ni-Vee bronze C, copper-nickel alloys 95-5, 80-20, 70-30 containing 0.5 

 percent iron, 70-30 containing 5 percent iron, 55-45, nickel-silver containing 18 

 percent nickel, and Cu-Ni-Zn-Pb corroded uniformly and their corrosion rates were 

 low, 1 MPY or less after 1 year at a depth of 2,500 feet and after 2 years at a 

 depth of 6,000 feet. 



The remainder of the alloys were attacked by selective corrosion: commercial 

 bronze, red brass, yellow brass, Muntz metal. Naval brass, manganese bronze, 

 nickel-manganese bronze, wrought 5 and 7 percent aluminum bronzes, cast 10, 11 

 and 13 percent aluminum bronzes, 3 percent silicon bronze and silicon bronze A. 



The copper alloys were not susceptible to stress corrosion cracking. 



Only the mechanical properties of the alloys attacked by selective corrosion 

 were adversely affected. 



DD 



.1473 



S/N 010 1-807-680 1 



Unclassified 



SecurUv Classifi 



