Figure 8. Silver soldering of ground cable to steel pipe supporting the 

 zinc anode. 



There was, as anticipated, extensive loss of coating and corrosion on 

 the ground legs of the cathodically protected buoy. The two remote ground 

 cables that were attached to Leg 1 had been torn loose, thus accounting for 

 the -1 ,060-nnv potential shown in Table 2 for the anode pipe. This anode 

 looked the same as when it was first placed in service, while those on the 

 other three sinker blocks were in the same condition as the ones on the buoy, 

 indicating that they had been functioning properly. 



The resistance in all the ground cables and all the soldered connections 

 was measured using a vacuum tube volt meter. No appreciable resistance was 

 found in any part of the circuitry. 



Zinc Anodes With Additional Leads 



A test was made to determine the effect on the potential profile by 

 adding additional leads from the anodes to the mooring. On the buoy, a 

 connection was made from the end of the anodes opposite the control head 

 directly to the buoy shell. On the ground legs, two leads were joined from 

 each anode in the sinker block to a link located 6 feet on either side of the 

 block. The entire mooring was reinstalled in the Bay as tightly as possible. 



12 



