















Depth (ft) 



A 













6,000 2,500 













Steels O • _ 

 Cast irons A A 

 Austenitic cast irons 

 Silicon & silicon-molybdenum cast irons X X 













K 





















\\.i 





El 













r K 



T~ 





VJiA 











I — G>A 





1 



4 





. I 



1 



] 









a 





x— 



/ 



>v 



X 





■ ■ ^ 



600 

 '.xposurc (das) 



1,000 



Figure 4. Effect of duration of exposure on corrosion of steels and cast irons in 

 bottom sediments. 



13 



