On the hydrogen etching mechanism in plasma nitriding of metals

Figueroa‚ CA; Alvarez‚ F.

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(Reference retrieved automatically from Google Scholar through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the hydrogen etching mechanism in plasma nitriding of metals

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Author(s):	Figueroa‚ CA ; Alvarez‚ F. Total Authors: 2
Document type:	Journal article
Source:	Applied Surface Science; v. 253, n. 4, p. 1806-1809, 2006.
Abstract
Iron alloys and aluminum were nitrogen implanted in a controlled oxygen atmosphere and the role of hydrogen on the surface etching mechanisms studied. The surface composition was analyzed by in situ photoemission electron spectroscopy (XPS). In iron alloys, hydrogen strongly etches oxygen, improving nitrogen retention on the surface. On the other hand, hydrogen removes nitrogen from aluminum surfaces, with a deleterious effect on the nitriding effectiveness. The oxygen removal in iron alloys is associated with the catalytic effect of electrons in d-orbitals and the nitrogen removal in aluminum is associated with a steric effect. (c) 2006 Elsevier B.V. All rights reserved. (AU)

FAPESP's process:	04/01977-9 - Nano and microstructure of nitrogen-containing metal alloys implanted by pulsed plasma and ion beam
Grantee:	Carlos Alejandro Figueroa
Support Opportunities:	Scholarships in Brazil - Post-Doctoral

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