Figure 23. Dense marine growth (bryozoans) on cylindrical test chambers after 

 268 days in the sea. 



Figure 24. Carbon steel (top) and aluminum 

 alloy (bottom) control panels. 

 Surfaces of steel panels covered 

 with uniform coating of paper- 

 thin corrosion products. Several 

 tubeworms are present on the 

 surfaces of aluminum alloy panels 

 (268 days). The test panels were 

 in cylindrical test chambers with 

 ruptured membrane filter seal. 



26 



