Effect of High Flow on Calcareous Deposits and Cathodic Protection Current Density

reportActive / Technical Report | Accession Number: ADA201737 | Open PDF

Abstract:

The effect of flowing seawater on cathodic protection current demand was studied by using a modified rotating cylinder electrode. Hy 80 steel, nickel aluminum bronze, and alloy 625 were evaluated at velocities of up to 90 fts. Measurements were made of the current required to polarize these specimens to - 800 mV versus saturated calomel electrode with and without calcareous deposits preformed under quiescent conditions. Bronze and alloy 625 exhibited a two order of magnitude decrease in current when calcareous deposits were present. The steel exhibited less of a decrease in current when calcareous deposits were present. The steel exhibited less of a decrease, probably because a calcareous deposit formed on the bare surface during the exposure. High rotation speeds did not removed the calcareous deposits. Cathodic polarization curves were developed for material with calcareous deposits at 45 fts. Keywords Corrosion, Copper nickel, Electromechanical impedance, Saltwater, Copper, Bronze, Steel.

Author(s):
Hack, Harvey P. ; Guanti, Robert J.
Author Organization(s):
DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
Descriptive Note:
Research and development rept.
Pagination:
0033

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
DTRC/SME-87/82
Task Number(s):
ZR0000101, S1266001
Project Number(s):
ZR00001, S1266
Monitor Series:
DTRC/SME
 Subject Terms
Joint Capability Areas:
JCA_6.4.1_Secure Information Exchange; JCA_4_Logistics; JCA_6.4_Information Assurance; JCA_6_Net Centric; JCA_5_Command and Control
Modernization Areas:
Cyber
Communities of Interest:
Ground and Sea Platforms
Descriptor(s):
*SEA WATER, *ALUMINUM, *BRONZE, *CATHODIC PROTECTION, *STEEL, *NICKEL, *WATER FLOW, ELECTRODES, FLOW, IMPEDANCE, ROTATION, COPPER, CYLINDRICAL BODIES, ELECTROMECHANICAL DEVICES, SURFACES, CURRENT DENSITY, HIGH VELOCITY, CORROSION, HIGH RATE
Field(s)/Group(s):
Properties of Metals and Alloys
Keyword(s):
*HY 80 STEEL, *NICKEL ALUMINUM BRONZE ALLOY, *ALLOY 625 26, PE61152N, WU2813115
Report Date:
1987 May 01