Exposed on plastic strip 



Cylinder— ends left open 



Cylinder— ends covered with nylon 

 screen cloth 



Cylinder— ends covered with membrane 

 filter 



25 50 75 100 



Length of Exposure (days) 

 Figure 33. Corrosion rates of 1010 carbon steel near ocean surface after 23, 43, 64, 



and 92 days under various conditions. 

 30 





o Exposed on plastic strip 

 Cylinder— ends left open 







^7 Cylinder-ends covered with nylon 

 screen cloth 



□ Cylinder- ends covered with membrane 







filter 





0-- 



^^ 













- ^ 











V— 





Rn 



R 











25 50 75 100 



Length of Exposure (days) 

 Figure 34. Corrosion rates of 7178-T6 aluminum alloy near ocean surface after 

 23, 43, 64, and 92 days under various conditions. 



33 



