Table 19. Continued. 



Alloy 



CDA 



No. a 



f ■ b 

 Environment 



Exposure 

 (day) 



Depth 

 (ft) 



Corrosion 

 Rate 



(mpy) 



Type of 

 Corrosion 17 



Source 



Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 

 Ni-Vee Bronze C 



- 



S 

 W 

 S 

 W 

 S 

 W 

 S 

 W 

 W 



751 

 1,064 

 1,064 

 197 

 197 

 402 

 402 

 181 

 366 



5,640 

 5,300 

 5,300 

 2,340 

 2,340 

 2,370 

 2,370 

 5 

 5 



0.4 

 0.5 

 0.3 

 0.8 

 <0.1 

 0.6 

 0.1 

 1.8 

 1.5 



U 



U 



U 



U 

 ET 



U 

 ET 



U 

 CR(5) 



INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 

 INCO (3) 



Copper Development Association alloy number. 



W = Totally exposed in seawater on sides of structure, S = Exposed in base of structure so that ; 

 portion of each specimen was exposed in the bottom sediments. 



Symbols for types of corrosion: 

 C = Crevice 



CO = Coppering, a selective attack where copper 



appears on surface similar to dezincification 

 CR = Cratering 



DA = Dealuminification 



ET = Etching 



EWO = Etched only in the water 



G = General 



GBSL = General below sediment line 



Numbers indicate maximum depth in mils. 

 Numbers refer to references at end of report. 

 Cast alloy. 

 /, 



I 



= Incipient 



MD 



= Medium 



MO 



= Moderate 



NU 



= Nonuniform 



P 



= Pitting 



S 



= Severe 



SL 



= Slight 



U 



= Uniform 



V 



= Very 



Pitting in bottom sediment, 12 mils maximum. 

 *At spacer. 

 At crevice. 

 Severe corrosion in small area. 



77 



