electrodes 62, 82 and 132; nlckel-chromium-iron alloy X750 welded 

 with electrode 718; nickel-iron-chromium alloy 800 welded with 

 electrodes 82 and 138; and nickel-iron-chromium alloy 825 welded 

 with electrode 135. 



There was no selective attack when nickel-copper alloy 400 

 was welded with electrodes 130 and 180; when nickel-chromium-iron 

 alloy 600 was welded with electrode 182; when nickel-chromium-iron 

 alloy X750 was welded with electrode 69; when nickel-iron-chromium 

 alloy 825 was welded with electrode 65; and when nickel-chromium- 

 iron alloy 718 was welded with electrode 718. 



Nickel 200, nickel-copper 400, nickel-molybdenum-chromium alloy 

 C and nickel-iron-chromium alloy 825 were immune to stress corro- 

 sion cracking. 



Corrosion products from the nickel-copper alloys contained 

 cupric oxide (CuO) , nickel oxide (NiO) , nickel hydroxide (Ni(OH)„), 

 cupric chloride (CUCI2) , trace nickel sulfide (NiS) , copper oxy-~ 

 chloride (CuCl2.3Cu0.4H^0) and phosphate, chloride and sulfate ions. 



The mechanical properties of nickel and the nickel alloys were 

 unaffected by exposure at depths in the Pacific Ocean except for 

 decrease in percent elongation of nickel-iron-chromium alloy 902, 



ACKNOWLEDGMENTS 



The author wishes to acknowledge the generosity of Dr. T. P. 

 May, Manager, Harbor Island (Kure Beach) Corrosion Laboratory, 

 International Nickel Company, Incorporated for granting permission 

 to include his deep ocean corrosion data in this report. 



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