This report discusses the dealloying (denickelification) of 70-30 cupronickel (UNS C 71500) heat exchanger tubing in stagnant seawater. Heat exchanger tubing from a naval vessel exposed to stagnant seawater was examined. The results include metallographic, scanning electron microscope, and X-ray spectrographic analyses supporting the conclusion that the dealloying occurred by a dissolution followed by redeposition of copper process.

Subject
Scanning electron microscopy, Grain size, Materials, Substrates, Metal surfaces, Metallography, Copper alloys, Substrate surfaces, Tubing, Metals, Copper, Deposit corrosion, Dealloying
Keywords:
cupronickel, dealloying, denickelification, corrosion, marine corrosion, saltwater corrosion, heat exchanger, scanning electron microscope (SEM)
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1999
GOV
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