Effect of Noble Element Alloying on Passivity and Passivity Breakdown of Ni

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dc.creator Kim, Yeong Ho
dc.creator Frankel, G. S.
dc.date.accessioned 2010-05-21T16:32:16Z
dc.date.available 2010-05-21T16:32:16Z
dc.date.issued 2007
dc.identifier.citation Kim, Yeong Ho; Frankel, G. S. "Effect of Noble Element Alloying on Passivity and Passivity Breakdown of Ni," Journal of The Electrochemical Society, v. 154, no. 1, 2007, pp. C36-C42. en_US
dc.identifier.issn 0013-4651 (print)
dc.identifier.uri http://hdl.handle.net/1811/45422
dc.description.abstract Welding of stainless steels can generate welding fumes containing carcinogenic hexavalent chromium (Cr^+6). To mitigate this problem, a new Ni-Cu-Pd welding consumable alloy has been developed. The addition of a small amount of Cu and Pd in Ni enhances the galvanic compatibility of Ni with stainless steels and improves its localized corrosion behavior. In this paper, the artificial pit electrode technique and X-ray photoelectron spectroscopy were used to study the benefits of Cu and Pd alloying. The passive film on Ni-10Cu-1Pd alloy mainly consisted of outer Ni-hydroxide and inner oxide, and the noble elements Pd and Cu apparently did not contribute to the formation of the passive film. However, Pd catalyzed the reduction of Cu at the bottom of artificial pits, which enhanced the cathodic reaction and thus ennobled the protection potential, making stable pit growth more difficult. This catalytic effect of Pd also prevented the propagation of deep pits in a test using a thin foil crevice sample. en_US
dc.description.sponsorship Financial support of the Strategic Environmental Research and Development Program (SERDP) through project WP-1415 is greatly appreciated. en_US
dc.language.iso en_US en_US
dc.subject Cu and Pd alloying en_US
dc.subject X-ray photoelectron spectroscopy en_US
dc.subject artificial pit electrode technique en_US
dc.title Effect of Noble Element Alloying on Passivity and Passivity Breakdown of Ni en_US
dc.type Article en_US
dc.identifier.doi 10.1149/1.2387060
dc.rights.cc Attribution-ShareAlike 3.0 Unported en_US
dc.rights.ccuri http://creativecommons.org/licenses/by-sa/3.0/ en_US
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