XPS investigation on the surface chemistry of corrosion products on ZnMgAl-coated steel.
Anal Bioanal Chem
; 405(22): 7133-44, 2013 Sep.
Article
em En
| MEDLINE
| ID: mdl-23831753
In this work, a novel evaluation strategy for the X-ray photoelectron spectroscopy (XPS) chemical assessment is proposed to identify the corrosion products formed on the surface of hot-dip galvanized ZnMgAl coatings after exposure to standardized salt spray tests. The experiments demonstrate that the investigated system exhibits a problematic differential charging behavior between the different compounds, an effect which cannot be fully compensated for by the flood gun of the XPS system, making a reliable evaluation of the individual spectra impossible by using standard evaluation and fitting methods. For that reason, a new effective approach--taking the different charge shifts into account--was implemented and its reliability experimentally verified on model mixtures of assumed corrosion products with known composition. With this new approach, the chemical surface composition of an industrial sample of a corroded ZnMgAl coating was revealed and discussed in order to clearly demonstrate the potential of the proposed method for future corrosion studies.
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MEDLINE
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Áustria