steel specimens were covered with a thick red rust on which were fouling 

 organisms. Since the surfaces of the aluminum alloy panels were not covered 

 with a layer of corrosion products, large numbers of marine organisms were 

 attached directly onto the surface and were very difficult to remove. The 

 3/4-inch-diameter baseplate of a barnacle was securely attached to the surface 

 of an aluminum panel, and it was especially difficult to remove (Figure 22). 



Figure 14. Exposed carbon steel (top) and aluminum alloy (bottom) panels 

 covered with marine growth and corrosion products (112 days). 



