The Effects of Velocity on Corrosion of Galvanic Couples in Seawater.
Abstract
The effects of velocity on the corrosion of galvanic couples (70/30 Cu-Ni/plain carbon steel and K-Monel/plain 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 growth/removal cycle and consequent surface metal removal sequence is hypothesized under dynamic conditions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1977
- Accession Number
- ADA048669
Entities
People
- Gary Alan Storm
Organizations
- Naval Postgraduate School