PREFACE 
Since 1959 the Naval Civil Engineering Laboratory has been develop- 
ing the technology necessary for designing, constructing, inspecting and 
maintaining structures and fixed equipment on the ocean floor. A part 
of this program is to determine the effects of deep ocean environments 
on the corrosion of metals and alloys. 
A Submersible Test Unit (STU) was designed to which many test spec- 
imens can be attached. The STU can be lowered to the ocean floor for 
long periods of exposure, then retrieved. 
Thus far, two deep ocean test sites in the Pacific Ocean have been 
selected. Eight STUs have been exposed and seven have been recovered. 
Test Site I (nominal depth of 6,000 feet) is approximately 81 nautical 
miles west-southwest of Port Hueneme, California, latitude 33°44'N and 
longitude 120°45'W. Test Site II (mominal depth of 2,500 feet) is 75 
nautical miles west of Port Hueneme, California, latitude 34°06'N and 
longitude 120°42'W. In addition, a surface seawater exposure site (V) 
was established at Point Mugu, California, latitude 34°06'N and longi- 
tude 119°07'W to obtain surface immersion data for comparison purposes. 
This report presents the results of the evaluations of 60 differ- 
ent alloys, many of which are newly developed alloys, after 189 days of 
exposure at a depth of 5,900 feet. 
wn TU 
0301 0040¢c 
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