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

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 ft/s. 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 ft/s. Keywords: Corrosion, Copper nickel, Electromechanical impedance, Saltwater, Copper, Bronze, Steel.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA201737

Entities

People

  • HP Hack
  • Robert J. Guanti

Tags

Communities of Interest

  • Cyber
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Air Entrainment
  • Aluminum
  • Body Weight
  • Boundary Layer
  • Cathodic Protection
  • Chemistry
  • Classification
  • Current Density
  • Diffusion
  • Elements
  • Engineering
  • Flow
  • Fluid Flow
  • Materials
  • Materials Engineering
  • Metals

Fields of Study

  • Materials science

Readers

  • Electrochemical Surface Science
  • Geotechnical Engineering.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).

Technology Areas

  • Microelectronics