The effects of decaying marine organisms on the corrosion of copper-nickel alloys in sea water

PDF

Authors
  1. Lenard, D.R.
  2. Welland, R.R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Recent changes in construction techniques and operational practice have resulted in a number of failures of copper-nickel components in sea water systems, including perforation of 70/30 heat exchanger tubes that was attributed to exposure to sulfide-polluted, stagnant sea water during shutdowns. In an effort to understand the mechanism of these failures, 70/30 copper-nickel specimens were exposed to flowing sea water until protective films were developed. Some of the specimens were then buried in organic debris that had been allowed to accumulate at the bottom of the tank. These specimens were then re-exposed to flowing sea water after two weeks. Corrosion rates were monitored throughout the experiment using linear polarization resistance. The corrosion rate increased by an order of magnitude when the specimens were re-exposed to flowing sea water. The results also suggest that repair of damaged protective films may take longer than initial film formation.
Keywords
Marine organisms
Report Number
DREA-SR-2001-094-SES-VI-PAP-27 — Special Report
Date of publication
01 Oct 2001
Number of Pages
18
DSTKIM No
CA011864
CANDIS No
516442
Format(s):
Hardcopy;Document Image stored on Optical Disk

Permanent link

Document 1 of 1

Date modified: