Accession Number:

ADA059646

Title:

The Effect of Flow Structure on Corrosion: Circling-Foil Studies on 90/ 10 Copper-Nickel, and Hydrodynamic Modeling of the Erosion-Corrosion Process

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Report Date:

1978-05-01

Pagination or Media Count:

93.0

Abstract:

The effects of turbulent flow on the corrosion behavior of 9010 Cu- Ni were studied experimentally in synthetic seawater electrolyte, using a circling foil apparatus at relative velocities up to about 6 msec. The flow field at the specimen surface was characterized by anemometric methods. Corrosion rates were determined by direct weight loss and by several electrochemical methods, including the linear polarization method and from Tafel plots also zero resistance ammeter measurements were made on galvanic couples. Consideration was given to the question of the appropriate analyticlal approach to velocity fluid flow effects on corrosion processes. The contribution of convective diffusion is considered dominant over the velocity range studied, and the rate of eddy diffusivity fine flow structure effects on mass transport is described. The separate electrochemical and mechanical influences of high- intensity turbulent flows are considered. Author

Subject Categories:

  • Physical Chemistry
  • Properties of Metals and Alloys
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE