6 



7 



8 



9 



10 



11 



Remarks 





2024T3 



Corrosion- 









Panels of 



Steel 



Aluminum 

 Alloy 



Resistant 

 Steel 



Steel 



Steel 



Steel 



mild steel 

 except as noted 



Corrosion- 



None. 



Uncoated. 



Corrosion- 



Corrosion- 



Corrosion-resistant 



All antifouling 



resistant and 





Flat plates 



res istant 



resistant 



coating with copper 



coatings were 



cuprous oxide 





bolted 



coatings 



coatings 



oxide antifouling. 



different standard 



antifouling 





together with 



with tri- 



with tri- 





commerical or 



coatings. 





a CRES bolt 

 and nut. 



butyl-tin 



oxide 



antifouling. 



butyl-tin 



oxide 



antifouling. 





Navy standard. 



Edges were 



Heavily 



Similar to 



Relatively 



Surface was 



Coating turned from 





fouled slight- 



burdened 



panel 7 with 



light foul- 



covered with 



red to apple green. 





ly. General 



with bran- 



a greater con- 



ing over 



variegated 



The panel was 





condition 



ching 



centration of 



92% of the 



combination 



fouled over the sur- 





good. Very 



bryozoa. 



yellow sponge. 



surface. 



of filamen- 



face in clumps of 





little fou ling. 



m inor 



Corrosion in 



Jingles 



tous a Igae, 



filamentous algae. 





away from the 



infestations 



bolt area 



started the 



dotted with 



These were smal 1 





edges, and 



of ye How 



(fig. 8). 



procedure 



Balanus 



and randomly 





that too small 



sponge and 





with bran- 



tintinnabu- 



scattered over the 





to be identi- 



crustose 





ching and 



lum from 



face of the panel. 





fied without a 



bryozoa. 





crustose 



very smal 1 



Approximately 60% 





microscope 



Some 





bryozoa 



to approxi- 



of the plate was 





(fig. 6). 



tunicates. 





general ly 



mately l'/2 



covered with either 







jingles. 





over the 



inches 



this or a silt-like 







and tube 





surface 



across. 



filth. 







worms were 





(fig. 10). 



These were 









in evidence. 







fairly numer- 

 ous: 10 to 15 

 on one side. 







Panel was 



Heavy 



Heavy corro- 



3 jingles 



Corrosion 



Bad corrosion on 





clean except 



corrosion. 



s ion of bolt and 



attached; 



area about 



edge, with blis- 





for a brown 



Hydroids 



immediate area. 



traces of 



1 inch long 



ters. Apparent 





stain cover- 



over 50% 



Several sma II 



several 



on one edge. 



lack of adhesion 





ing about 



of the 



jingle shells. 



others 



The panel 



of coating. No 





75% of the 



surface. 



Sea anemones 



having been 



was free of 



fouling, but a 





area (fig. 7). 



Algal 



and hydroids 



attached 



fouling. 



creeping corro- 







fouling 



attached lightly 



and fallen 





sion. 







approxi- 



over the surface. 



off. Also 











mately 



There appeared 



attached 











10% and a 



to be crustose 



were 25 or 











few sea 



bryozoa over 



so sea 











anemones. 



about 20% of the 

 panel (fig. 9). 



anemones, 

 a starfish, 

 and large 

 flat worm 

 (see fig. 

 11). 









