A Study of the Stress Corrosion Susceptibility of Cupro-Nickel and Titanium under Desalination Conditions

Abstract

An investigation was conducted of the susceptibility to stress corrosion cracking of 90Cu-10Ni, 70Cu-30Ni, and two commercial grades of unalloyed titanium TMCA 50A and 75A for conditions characteristic of those encountered during desalination operations. Bent-beam specimens from sheet and tubing, and C-rings from tubing were exposed at or near the macroscopic yield stress to brackish well water, seawater or sea-salt brines (7 and 11 w/o total salt), at zero or 8. 5 fps, at temperatures of 75, 204, or 250 deg F. These materials did not exhibit stress corrosion cracking under these conditions. In addition, titanium did not experience any detectable corrosive attack up to about 1000 hr. exposure. Within this period, however, the Cu-Ni alloys suffered severe impingement attack, yielding corrosion rates in the range 1 to 200 mpy, depending on the testing variables. It was concluded that titanium is, potentially, a far more reliable candidate material for desalination service than is cupro-nickel.

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Document Details

Document Type
Technical Report
Publication Date
Oct 31, 1968
Accession Number
ADA382568

Entities

People

  • R. N. Orava

Organizations

  • University of Denver

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Body Weight
  • Brackish Water
  • Chemistry
  • Corrosion
  • Elements
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Metals
  • Modulus Of Elasticity
  • Salt Water
  • Solid Solutions
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Titanium
  • Yield Strength

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.