Nanoscale analysis of surface oxides on ZnMgAl hot-dip-coated steel sheets.
Anal Bioanal Chem
; 403(3): 651-61, 2012 May.
Article
em En
| MEDLINE
| ID: mdl-22086398
ABSTRACT
In this work, the first few nanometres of the surface of ZnMgAl hot-dip-galvanised steel sheets were analysed by scanning Auger electron spectroscopy, angle-resolved X-ray photoelectron spectroscopy and atomic force microscopy. Although the ZnMgAl coating itself is exhibiting a complex micro-structure composed of several different phases, it is shown that the topmost surface is covered by a smooth, homogeneous oxide layer consisting of a mixture of magnesium oxide and aluminium oxide, exhibiting a higher amount of magnesium than aluminium and a total film thickness of 4.5 to 5 nm. Especially by the combined analytical approach of surface-sensitive methods, it is directly demonstrated for the first time that within surface imprints--created by industrial skin rolling of the steel sheet which ensures a smooth surface appearance as well as reduced yield-point phenomenon--the original, smooth oxide layer is partly removed and that a layer of native oxides, exactly corresponding to the chemical structure of the underlying metal phases, is formed.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Áustria