Accession Number:

ADA048669

Title:

The Effects of Velocity on Corrosion of Galvanic Couples in Seawater.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Storm,Gary Alan

Report Date:

1977-09-01

Pagination or Media Count:

139.0

Abstract:

The effects of velocity on the corrosion of galvanic couples 7030 Cu-Niplain carbon steel and K-Monelplain carbon steel in synthetic seawater electrolyte were studied. A unique experimental apparatus was designed and built, employing a foil-shaped specimen holder rotating in a tank, and the hydrodynamic flow conditions within the test system were carefully characterized. Galvanic current measurements were taken at various velocities and corrosion product formation and dissolution patterns were studied. A model is developed which considers both hydrodynamic and electrochemical boundary layer effects, and the role of the polarization characteristics of the individual metals is discussed. The development of corrosion products, protective oxide films, and surface metal removal are discussed. A corrosion product growthremoval cycle and consequent surface metal removal sequence is hypothesized under dynamic conditions. Author

Descriptors:

• *SEA WATER CORROSION
• *GALVANIC CORROSION
• VELOCITY
• POLARIZATION
• CORROSION
• THESES
• BOUNDARY LAYER
• ELECTROCHEMISTRY
• ELECTROLYTES
• SEA WATER
• HYDRODYNAMICS
• MODEL BASINS

Subject Categories:

• Marine Engineering
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE