Table 86. Continued. 











Corrosion 





Alloy 



Environment 



Exposure 

 (day) 



Depth 



(ft) 



Rate 

 (mpy) 



„ b 

 Type 



Source 



Tungsten 



W 



402 



2,370 



0.6 



U 



CEL (4) 



Tungsten 



S 



402 



2,370 



0.5 



U 



CEL(4) 



Tungsten 



W 



182 



5 



2.8 



u 



CEL (4) 



Tungsten 



W 



364 



5 



3.2 



u 



CEL (4) 



Tungsten 



W 



723 



5 



3.7 



u 



CEL (4) 



Tungsten 



W 



763 



5 



4.0 



u 



CEL (4) 



Zinc 



W 



123 



5,640 



6.7 



P(13) 



1NCCM3) 



Zinc 



S 



123 



5,640 



5.0 



P(25) 



1NCO (3) 



Zinc 



W 



403 



6,780 



5.9 



C(PR)(30) 



1NCO (3) 



Zinc 



S 



403 



6,780 



0.2 



G 



INCO (3) 



Zinc 



W 



751 



5,640 



3.6 



G 



INCO (3) 



Zinc 



s 



751 



5,640 



2.8 



G 



INCO (3) 



Zinc 



w 



1,064 



5,300 



2.4 



CR; E 



INCO (3) 



Zinc 



s 



1,064 



5,300 



0.7 



G 



INCO (3) 



Zinc 



w 



197 



2,340 



2.3 



P (2) 



INCO (3) 



Zinc 



s 



197 



2,340 



0.3 



G 



INCO (3) 



Zinc 



w 



402 



2,370 



2.8 



G 



INCO (3) 



Zinc 



s 



402 



2,370 



2.4 



GASL 



INCO (3) 



Zinc 



w 



182 



5 



4.5 



P(5) 



INCO (3) 



Zinc 



w 



366 



5 



2.8 



P(10) 



INCO (3) 



' W = Totally exposed in seawater on sides of structure ; S = Exposed in base of structure so that the lower portions of 

 the specimens were embedded in the bottom sediments. 



Symbols for types of corrosion: 



C = Crevice 



CR = Cratering 



ET = Etched 



EX = Extensive 



G = General 



N = Numerous 



NC = No visible corrosion 



P = Pitting 



Numbers in parentheses indicate maximum depth in mil 



Numbers refer to references at end of report. 



Thick, black, brittle crust of corrosion products. 



PR 



= 



Perforated 



S 



= 



Severe 



sc 



= 



Scattered 



SH 



= 



Shallow 



U 



= 



Uniform 



50C 



= 



50% corroded 



95C 



= 



95% corroded 



100C 



= 



100% corroded 



General above sediment line. 



250 



