Figure 27. Corrosion along the edges and ends of exposed aluminum alloy panels is 

 much more severe than over the edges and ends of control aluminum alloy 

 panels (268 days). 



1 1 1 1 



O Exposed on plastic strip 

 Q Cylinder— ends covered with 



1 

 Tiembrane filter 











Aluminum alloy (7178-T6) 





















































a 



^ 





















o- 



'-'' 









_ 







-^ 



^ 

















§- 



D- 

















a 







- -a — 



1 



■ 1 









J 



D 



100 125 150 175 

 Length of Exposure (days) 



Figure 28. Corrosion rate of carbon steel and aluminum alloy exposed near ocean 

 surface for 70, 1 12, and 268 days. 



28 



