The aluminum alloys were attacked by pitting and crevice corrosion 

 and seawater was more aggressive at depth than at the surface for such 

 alloys. The effect of the concentration of oxygen in seawater on the 

 corrosion of aluminum alloys was inconsistent. 



The stainless steels were attacked by pitting, tunneling and crevice 

 corrosion, except 309, 316L, 317, 329, 633, 0Cb-3 and Ni-Cr-Mo-Si. 

 Surface seawater was more aggressive than seawater at depth in promot- 

 ing these types of corrosion on the stainless steels. 



