Microstructural characterization of the corroded surface of laser clad nickel aluminum bronze following long-term sea-water exposure

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Authors
  1. Gianetto, J.A.
  2. Botton, G.A.
  3. Hyatt, C.V.
Corporate Authors
CANMET Materials Technology Lab, Ottawa ONT (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The long-term corrosion performance of surface ship and submarine components that are made of nickel-aluminum bronze (NAB) continues to be of interest to the Canadian Navy. Collaborative research between the Defence Research Establishment Atlantic and CANMET's Materials Technology Laboratory has focused on ways of improving the surface sensitive properties of NAB components utilizing laser weld cladding procedures. In the study described in this preentation laser clad weld specimens exposed to stagnent polluted seawater for several years were characterized using optical and scanning electron microscopy, as well as focused ion beam (FIB) techniques to prepare samples for detailed transmission electron microscopy (TEM). This new FIB/TEM approach characterizing the microstructural features associated with corrosion offers new insights about the detailed microstructure of teh corrosion films. Data on corrosion film structure and composition as assessed by high-resoltion elemental mapping, energy loss spectroscopy for chemical state analysis, and electron diffraction will be described in this presentation.
Keywords
Laser cladding;Nickel aluminum bronzes
Report Number
DREA-SR-2001-094-SES-I-PAP-4 — Special Report
Date of publication
01 Oct 2001
Number of Pages
17
DSTKIM No
CA011841
CANDIS No
516414
Format(s):
Hardcopy;Document Image stored on Optical Disk

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