Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61870
Title: Laser fabrication of W-reinforced Cu layers : I. Corrosion behavior in 3.5% NaCl solution and synthetic acid rain
Authors: Wong, PK
Kwok, CT
Man, HC 
Guo, D
Keywords: Alloys
Coatings
Corrosion
SEM
Issue Date: 2016
Publisher: Elsevier
Source: Materials chemistry and physics, 2016, v. 181, p. 397-408 How to cite?
Journal: Materials chemistry and physics 
Abstract: Surface modification of commercially pure copper (cp Cu) with W powder was achieved by using a high power diode laser (HPDL) resulting in a microstructure of micron-sized W particles in a Cu matrix. In both 3.5 wt% NaCl solution and synthetic acid rain (SAR), the laser-fabricated specimens possess lower corrosion current density (I corr) than that of cp Cu despite the active shift in open-circuit potential (OCP). Although Cu is cathodic to W in 3.5 wt% NaCl solution, the Cu phase in the laser-fabricated specimens dominantly dissolves during the immersion test. This anomalous observation is possible because the OCP values of the laser-fabricated specimens, cp Cu and cp W are quite near to each other, while the anodic and cathodic current densities are all not negligible for the Cu and W phases at OCP. As the anodic current density of the Cu phase is greater than anodic current density of the W phase, the Cu phase corrodes more quickly than the W phase. For the laser-fabricated specimens immersed in SAR, the Cu phase is anodic and is selectively attacked while the W phase is passive due to the formation of WO3.
URI: http://hdl.handle.net/10397/61870
ISSN: 0254-0584
EISSN: 1879-3312
DOI: 10.1016/j.matchemphys.2016.06.075
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