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|Document Type: ||Article|
|Title: ||Corrosion Performance of Laser Posttreated Cold Sprayed Titanium Coatings|
|Authors: ||Marrocco, T.|
McCartney, D. G.
Shipway, P. H.
|Issue Date: ||2011|
|Abstract: ||The recent development of cold spray technology has made possible the deposition
of highly reactive,oxygen sensitive materials, such as titanium, without
significant chemical reaction of the powder, modificationof particle
microstructure and with minimal heating of the substrate. However, the presence
ofinterconnected pathways (microscale porosity) within the deposit limits the
performance of the metalliccoating as an effective barrier to corrosion and
substrate attack by corrosive media is usually inevitable.The aim of the present
study was to investigate the effects of processing, including a postspray
lasertreatment, on the deposit microstructure and corrosion behavior.
Commercially pure titanium (CP Ti)was deposited onto a carbon steel substrate,
using a commercial cold spray system (CGTTM Kinetiks4000) with preheated
nitrogen as both the main process gas and the powder carrier gas. Selected
coatingswere given a surface melting treatment using a commercial 2 kW CO2 laser
(505 Trumpf DMD). Theeffect of postdeposition laser treatment on corrosion
behavior was analyzed in terms of pore structureevolution and microstructural
changes. Optical microscopy, scanning electron microscopy, and x-raydiffraction
were employed to examine the microstructural characteristics of the coatings.
Their corrosionperformance was investigated using electrochemical methods in 3.5
wt.% NaCl (ASTM G5-94 (2004)).As-sprayed titanium coatings could not provide
favorable protection to the carbon steel substrate in theaerated NaCl solution,
whereas the coatings with laser-treated surfaces provided barrier-like
|Appears in Collections:||Staff publications - School of Applied Sciences|
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